10-Q

.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED March 31, 2024

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM                    TO                   

Commission File Number: 1-34392

PLUG POWER INC.

(Exact name of registrant as specified in its charter)

Delaware	22-3672377
(State or Other Jurisdiction of	(I.R.S. Employer
Incorporation or Organization)	Identification Number)

968 ALBANY SHAKER ROAD, LATHAM, NEW YORK 12110

(Address of Principal Executive Offices, including Zip Code)

(518) 782-7700

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Trading Symbol(s)	Name of Each Exchange on Which Registered
Common Stock, par value $.01 per share	PLUG	The NASDAQ Capital Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐ 

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐ 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non- accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

The number of shares of common stock, par value of $.01 per share, outstanding as of May 7, 2024 was 742,559,081 shares.

INDEX to FORM 10-Q

	Page
PART I. FINANCIAL INFORMATION
Item 1 – Interim Condensed Consolidated Financial Statements (Unaudited)	3
Condensed Consolidated Balance Sheets	3
Condensed Consolidated Statements of Operations	4
Condensed Consolidated Statements of Comprehensive Loss	5
Condensed Consolidated Statements of Stockholders’ Equity	6
Condensed Consolidated Statements of Cash Flows	7
Notes to Interim Condensed Consolidated Financial Statements	8
Item 2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations	35
Item 3 – Quantitative and Qualitative Disclosures About Market Risk	54
Item 4 – Controls and Procedures	54
PART II. OTHER INFORMATION
Item 1 – Legal Proceedings	55
Item 1A – Risk Factors	55
Item 2 – Unregistered Sales of Equity Securities and Use of Proceeds	56
Item 3 – Defaults Upon Senior Securities	56
Item 4 – Mine Safety Disclosures	56
Item 5 – Other Information	56
Item 6 – Exhibits	57
Signatures	58

2

PART 1.  FINANCIAL INFORMATION

Item 1 — Interim Financial Statements (Unaudited)

Plug Power Inc. and Subsidiaries

Condensed Consolidated Balance Sheets

(In thousands, except share and per share amounts)

(Unaudited)

	March 31,		December 31,
	2024		2023
Assets
Current assets:
Cash and cash equivalents	$	172,873	$	135,033
Restricted cash		219,616		216,552
Accounts receivable, net of allowance of $7,351 at March 31, 2024 and $8,798 at December 31, 2023		148,822		243,811
Inventory, net		975,898		961,253
Contract assets		129,994		126,248
Prepaid expenses and other current assets		119,370		104,068
Total current assets		1,766,573		1,786,965
Restricted cash		775,595		817,559
Property, plant, and equipment, net		1,453,991		1,436,177
Right of use assets related to finance leases, net		56,131		57,281
Right of use assets related to operating leases, net		389,201		399,969
Equipment related to power purchase agreements and fuel delivered to customers, net		115,109		111,261
Contract assets		30,380		29,741
Intangible assets, net		183,325		188,886
Investments in non-consolidated entities and non-marketable equity securities		66,691		63,783
Other assets		10,310		11,116
Total assets	$	4,847,306	$	4,902,738
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable	$	285,546	$	257,828
Accrued expenses		154,814		200,544
Deferred revenue and other contract liabilities		179,902		204,139
Operating lease liabilities		65,250		63,691
Finance lease liabilities		9,602		9,441
Finance obligations		85,175		84,031
Current portion of long-term debt		2,786		2,716
Contingent consideration, loss accrual for service contracts, and other current liabilities		128,369		142,410
Total current liabilities		911,444		964,800
Deferred revenue and other contract liabilities		75,900		84,163
Operating lease liabilities		278,220		292,002
Finance lease liabilities		33,673		36,133
Finance obligations		264,610		284,363
Convertible senior notes, net		209,802		195,264
Long-term debt		1,013		1,209
Contingent consideration, loss accrual for service contracts, and other liabilities		143,522		146,679
Total liabilities		1,918,184		2,004,613
Stockholders’ equity:
Common stock, $.01 par value per share; 1,500,000,000 shares authorized; Issued (including shares in treasury): 705,604,549 at March 31, 2024 and 625,305,025 at December 31, 2023		7,057		6,254
Additional paid-in capital		7,823,209		7,494,685
Accumulated other comprehensive loss		(9,078)		(6,802)
Accumulated deficit		(4,785,520)		(4,489,744)
Less common stock in treasury: 19,242,215 at March 31, 2024 and 19,169,366 at December 31, 2023		(106,546)		(106,268)
Total stockholders’ equity		2,929,122		2,898,125
Total liabilities and stockholders’ equity	$	4,847,306	$	4,902,738

The accompanying notes are an integral part of these unaudited interim condensed consolidated financial statements.

3

Plug Power Inc. and Subsidiaries

Condensed Consolidated Statements of Operations

(In thousands, except share and per share amounts)

(Unaudited)

	Three months ended
	March 31
	2024		2023
Net revenue:
Sales of equipment, related infrastructure and other	$	68,295	$	182,094
Services performed on fuel cell systems and related infrastructure		13,023		9,097
Power purchase agreements		18,304		7,937
Fuel delivered to customers and related equipment		18,286		10,142
Other		2,356		1,016
Net revenue		120,264		210,286
Cost of revenue:
Sales of equipment, related infrastructure and other		135,125		158,320
Services performed on fuel cell systems and related infrastructure		12,957		12,221
Provision for loss contracts related to service		15,745		6,889
Power purchase agreements		55,228		46,816
Fuel delivered to customers and related equipment		58,573		54,501
Other		1,711		935
Total cost of revenue		279,339		279,682
Gross loss		(159,075)		(69,396)
Operating expenses:
Research and development		25,280		26,535
Selling, general and administrative		77,959		104,016
Restructuring		6,011		—
Impairment		284		1,083
Change in fair value of contingent consideration		(9,200)		8,769
Total operating expenses		100,334		140,403
Operating loss		(259,409)		(209,799)
Interest income		9,277		17,632
Interest expense		(11,325)		(10,650)
Other expense, net		(6,996)		(4,771)
Realized loss on investments, net		—		(1)
Change in fair value of equity securities		—		5,075
Loss on equity method investments		(13,113)		(5,317)
Loss on extinguishment of convertible senior notes		(14,047)		—
Loss before income taxes	$	(295,613)	$	(207,831)
Income tax (expense)/benefit		(163)		1,270
Net loss	$	(295,776)	$	(206,561)
Net loss per share:
Basic and diluted	$	(0.46)	$	(0.35)
Weighted average number of common stock outstanding		641,256,134		589,205,165

The accompanying notes are an integral part of these unaudited interim condensed consolidated financial statements.

4

Plug Power Inc. and Subsidiaries

Condensed Consolidated Statements of Comprehensive Loss

(In thousands)

(Unaudited)

	Three months ended
	March 31,
	2024		2023
Net loss	$	(295,776)	$	(206,561)
Other comprehensive (loss)/income:
Foreign currency translation (loss)/gain		(2,276)		1,659
Change in net unrealized gain on available-for-sale securities		—		5,311
Comprehensive loss, net of tax	$	(298,052)	$	(199,591)

The accompanying notes are an integral part of these unaudited interim condensed consolidated financial statements.

5

Plug Power Inc. and Subsidiaries

Condensed Consolidated Statements of Stockholders’ Equity

(In thousands, except share amounts)

(Unaudited)

						Accumulated
				Additional		Other							Total
	Common Stock			Paid-in		Comprehensive		Treasury Stock			Accumulated		Stockholders’
	Shares	Amount		Capital		Gain/(Loss)		Shares	Amount		Deficit		Equity
December 31, 2023	625,305,025	$	6,254	$	7,494,685	$	(6,802)	19,169,366	$	(106,268)	$	(4,489,744)	$	2,898,125
Net loss	—		—		—		—	—		—		(295,776)		(295,776)
Other comprehensive loss	—		—		—		(2,276)	—		—		—		(2,276)
Stock-based compensation	923,027		9		13,695		—	—		—		—		13,704
Public offerings, common stock, net of issuance costs	79,553,175		796		304,550		—	—		—		—		305,346
Stock option exercises and issuance of common stock upon grant/vesting of restricted stock and restricted stock unit awards	(176,678)		(2)		43		—	—		—		—		41
Treasury stock acquired from employees upon exercise of stock options and vesting of restricted stock and restricted stock unit awards	—		—		—		—	72,849		(278)		—		(278)
Provision for common stock warrants	—		—		10,236		—	—		—		—		10,236
March 31, 2024	705,604,549	$	7,057	$	7,823,209	$	(9,078)	19,242,215	$	(106,546)	$	(4,785,520)	$	2,929,122
December 31, 2022	608,421,785	$	6,084	$	7,297,306	$	(26,004)	18,076,127	$	(96,261)	$	(3,120,911)	$	4,060,214
Net loss	—		—		—		—	—		—		(206,561)		(206,561)
Other comprehensive income	—		—		—		6,970	—		—		—		6,970
Stock-based compensation	228,954		2		43,300		—	—		—		—		43,302
Stock option exercises and issuance of common stock upon grant/vesting of restricted stock and restricted stock unit awards	620,250		6		668		—	—		—		—		674
Treasury stock acquired from employees upon exercise of stock options and vesting of restricted stock and restricted stock unit awards	—		—		—		—	169,787		(2,590)		—		(2,590)
Exercise of warrants	2,680,637		28		(28)		—	—		—		—		—
Provision for common stock warrants	—		—		19,641		—	—		—		—		19,641
March 31, 2023	611,951,626	$	6,120	$	7,360,887	$	(19,034)	18,245,914	$	(98,851)	$	(3,327,472)	$	3,921,650

The accompanying notes are an integral part of these unaudited interim condensed consolidated financial statements.

6

Plug Power Inc. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

	Three months ended March 31,
	2024		2023
Operating activities
Net loss	$	(295,776)	$	(206,561)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of long-lived assets		16,606		9,789
Amortization of intangible assets		4,725		4,959
Lower of cost or net realizable value inventory adjustment and provision for excess and obsolete inventory		39,675		2,009
Stock-based compensation		13,704		43,302
Loss on extinguishment of convertible senior notes		14,047		—
(Recoveries)/provision for losses on accounts receivable		(1,447)		237
Amortization of debt issuance costs and discount on convertible senior notes		330		621
Provision for common stock warrants		4,495		14,175
Deferred income tax expense/(benefit)		163		(947)
Impairment		284		1,083
Loss on service contracts		3,809		221
Fair value adjustment to contingent consideration		(9,200)		8,769
Net realized loss on investments		—		1
Accretion of premium on available-for-sale securities		—		(5,945)
Lease origination costs		(1,331)		(2,660)
Change in fair value for equity securities		—		(5,075)
Loss on equity method investments		13,113		5,317
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable		96,436		1,493
Inventory		(38,312)		(131,581)
Contract assets		1,356		(14,677)
Prepaid expenses and other assets		(14,496)		(5,522)
Accounts payable, accrued expenses, and other liabilities		25,755		13,821
Payments of contingent consideration		(9,164)		—
Deferred revenue and other contract liabilities		(32,500)		(9,748)
Net cash used in operating activities		(167,728)		(276,919)
Investing activities
Purchases of property, plant and equipment		(92,621)		(168,565)
Purchases of equipment related to power purchase agreements and equipment related to fuel delivered to customers		(6,072)		(11,389)
Proceeds from maturities of available-for-sale securities		—		315,827
Cash paid for non-consolidated entities and non-marketable equity securities		(21,891)		(40,077)
Net cash (used in)/provided by investing activities		(120,584)		95,796
Financing activities
Payments of contingent consideration		(836)		(2,000)
Proceeds from public and private offerings, net of transaction costs		305,346		—
Payments of tax withholding on behalf of employees for net stock settlement of stock-based compensation		(278)		(2,590)
Proceeds from exercise of stock options		41		674
Principal payments on long-term debt		(300)		(330)
Proceeds from finance obligations		—		27,927
Principal repayments of finance obligations and finance leases		(20,908)		(16,500)
Net cash provided by financing activities		283,065		7,181
Effect of exchange rate changes on cash		4,187		(2,096)
Increase/(decrease) in cash and cash equivalents		37,840		(215,769)
(Decrease)/increase in restricted cash		(38,900)		39,731
Cash, cash equivalents, and restricted cash beginning of period		1,169,144		1,549,344
Cash, cash equivalents, and restricted cash end of period	$	1,168,084	$	1,373,306
Supplemental disclosure of cash flow information
Cash paid for interest, net of capitalized interest of $2.1 million and $2.0 million	$	9,111	$	7,869
Summary of non-cash activity
Recognition of right of use asset - finance leases	$	—	$	4,018
Recognition of right of use asset - operating leases		2,913		22,470
Accrued debt extinguishment costs, cash to be paid in subsequent period		1,245		—
Net transfers between inventory and long-lived assets		16,008		441
Accrued purchase of fixed assets, cash to be paid in subsequent period		113,449		65,701

The accompanying notes are an integral part of these unaudited interim condensed consolidated financial statements.

7

1. Nature of Operations

Plug Power Inc. (the “Company”, “Plug”, “we” or “our”) is facilitating the paradigm shift to an increasingly electrified world by innovating cutting-edge hydrogen and fuel cell solutions. While we continue to develop commercially viable hydrogen and fuel cell product solutions, we have expanded our offerings to support a variety of commercial operations that can be powered with clean hydrogen. We provide electrolyzers that allow customers — such as refineries, producers of chemicals, steel, fertilizer and commercial refueling stations — to generate hydrogen on-site. We are focusing our efforts on (a) industrial mobility applications, including electric forklifts and electric industrial vehicles, at multi shift high volume manufacturing and high throughput distribution sites where we believe our products and services provide a unique combination of productivity, flexibility, and environmental benefits; (b) production of hydrogen; and (c) stationary power systems that will support critical operations, such as data centers, microgrids, and generation facilities, in either a backup power or continuous power role, and replace batteries, diesel generators or the grid for telecommunication logistics, transportation, and utility customers. Plug expects to support these products and customers with an ecosystem of vertically integrated products that produce, transport, store and handle, dispense, and use hydrogen for mobility and power applications.

Liquidity and Capital Resources

The Company’s working capital was $855.1 million as of March 31, 2024, which included unrestricted cash and cash equivalents of $172.9 million and restricted cash of $1.0 billion. On January 17, 2024, the Company entered into the At Market Issuance Sales Agreement (the “Original ATM Agreement”) with B. Riley Securities, Inc. (“B. Riley”), pursuant to which the Company may, from time to time, offer and sell through or to B. Riley, as sales agent or principal, shares of the Company’s common stock, having an aggregate offering price of up to $1.0 billion. As of February 23, 2024, the Company had $697.9 million remaining authorized for issuance under the Original ATM Agreement. On February 23, 2024, the Company and B. Riley entered into Amendment No. 1 to the Original ATM Agreement (the “Amendment” and, together with the Original ATM Agreement, the “ATM Agreement”) to increase the aggregate offering price of shares of the Company’s common stock available for future issuance under the Original ATM Agreement to $1.0 billion. Under the ATM Agreement, for a period of 18 months, the Company has the right at its sole discretion to direct B. Riley to act on a principal basis and purchase directly from the Company up to $11.0 million of shares of its common stock on any trading day (the “Maximum Commitment Advance Purchase Amount”) and up to $55.0 million of shares in any calendar week (the “Maximum Commitment Advance Purchase Amount Cap”). On and after June 1, 2024, so long as the Company’s market capitalization is no less than $1.0 billion, the Maximum Commitment Advance Purchase Amount will remain $11.0 million and the Maximum Commitment Advance Purchase Amount Cap will remain $55.0 million. If the Company’s market capitalization is less than $1.0 billion on and after June 1, 2024, the Maximum Commitment Advance Purchase Amount will be decreased to $10.0 million and the Maximum Commitment Advance Purchase Amount Cap will be decreased to $30.0 million. Through the date of filing of the Quarterly Report on Form 10-Q, the Company sold 135,354,467 shares of common stock at a weighted-average sales price of $3.38 per share for gross proceeds of $457.1 million with related issuance costs of $6.5 million. The Company believes that its working capital and cash position, together with its right to direct B. Riley to purchase shares directly from the Company under the ATM Agreement, will be sufficient to fund its on-going operations for a period of at least 12 months subsequent to the issuance of the accompanying condensed consolidated financial statements.

2. Summary of Significant Accounting Policies

Principles of Consolidation

The unaudited interim condensed consolidated financial statements include the financial statements of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. In addition, we include our share of the results of our joint ventures with Renault SAS (“Renault”) named HyVia SAS, a French société par actions simplifiée (“HyVia”), AccionaPlug S.L. (“AccionaPlug”), and SK Plug Hyverse Co., Ltd. (“SK Plug Hyverse”), and our investment in Clean H2 Infra Fund, using the equity method based on our economic ownership interest and our ability to exercise significant influence over the operating and financial decisions of HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund.

8

Interim Financial Statements

The accompanying unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, which consist solely of normal recurring adjustments, necessary to present fairly, in accordance with U.S. generally accepted accounting principles (“GAAP”), the financial position, results of operations and cash flows for all periods presented, have been made. The results of operations for the interim periods presented are not necessarily indicative of the results that may be expected for the full year.

Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “2023 Form 10-K”).

The information presented in the accompanying unaudited interim condensed consolidated balance sheets as of December 31, 2023 has been derived from the Company’s 2023 audited consolidated financial statements.

The unaudited interim condensed consolidated financial statements contained herein should be read in conjunction with our 2023 Form 10-K.

Reclassification

Certain prior year amounts in the unaudited interim condensed consolidated statements of cash flows have been reclassified to conform to the current year presentation. These reclassifications had no effect on the reported results of operations.

Recent Accounting Pronouncements

Recently Adopted Accounting Guidance

There have been no significant changes in our reported financial position or results of operations and cash flows resulting from the adoption of new accounting pronouncements.

Recent Accounting Guidance Not Yet Effective

All issued but not yet effective accounting and reporting standards as of March 31, 2024 are either not applicable to the Company or are not expected to have a material impact on the Company.

3. Extended Maintenance Contracts

On a quarterly basis, we evaluate any potential losses related to our extended maintenance contracts for sales of equipment, related infrastructure and other that have been sold. The following table shows the roll forward of balances in

9

the accrual for loss contracts, including changes due to the provision for loss accrual, releases to service cost of sales, increase to loss accrual related to warrants, and foreign currency translation adjustment (in thousands):

	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Beginning balance	$	137,853	$	81,066
Provision for loss accrual		15,111		85,375
Releases to service cost of sales		(11,936)		(29,713)
Increase to loss accrual related to customer warrants		634		971
Foreign currency translation adjustment		(93)		154
Ending balance	$	141,569	$	137,853

The Company increased its loss accrual to $141.6 million for the three months ended March 31, 2024 primarily due to continued cost increases of GenDrive labor, parts and related overhead coupled with new GenDrive contracts entered into requiring provisions to be set up. As a result, the Company increased its estimated projected costs.

4. Earnings Per Share

Basic earnings per common stock are computed by dividing net loss by the weighted average number of common stock outstanding during the reporting period. Since the Company is in a net loss position, all common stock equivalents would be considered anti-dilutive and are therefore not included in the determination of diluted earnings per share. Accordingly, basic and diluted loss per share are the same.

The potentially dilutive securities are summarized as follows:

	At March 31,
	2024	2023
Stock options outstanding (1)	36,384,062	27,479,533
Restricted stock and restricted stock units outstanding (2)	5,914,856	5,888,013
Common stock warrants (3)	78,561,263	85,879,175
Convertible Senior Notes (4)	44,661,605	39,170,766
Number of dilutive potential shares of common stock	165,521,786	158,417,487

(1) During the three months ended March 31, 2024 and 2023, the Company granted options for 313,000 and 94,550 shares of common stock, respectively.

(2) During the three months ended March 31, 2024 and 2023, the Company granted 17,000 and 94,550 shares of restricted stock and restricted stock units, respectively.

(3) In August 2022, the Company issued a warrant to acquire up to 16,000,000 shares of the Company’s common stock as part of a transaction agreement with Amazon.com, Inc. (“Amazon”), subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had not been exercised as of March 31, 2024 and 2023, respectively.

In April 2017, the Company issued a warrant to acquire up to 55,286,696 shares of the Company’s common stock as part of a transaction agreement with Amazon, subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had been exercised with respect to 34,917,912 and 27,600,000 shares of the Company’s common stock as of March 31, 2024 and 2023, respectively.

In July 2017, the Company issued a warrant to acquire up to 55,286,696 shares of the Company’s common stock as part of a transaction agreement with Walmart, Inc. (“Walmart”), subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had been exercised with respect to 13,094,217 shares of the Company’s common stock as of March 31, 2024 and 2023.

10

(4) In May 2020, the Company issued $212.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes due 2025 (the “3.75% Convertible Senior Notes”) as described in Note 9, “Convertible Senior Notes”. There were no conversions of the 3.75% Convertible Senior Notes for the three months ended March 31, 2024 and 2023.

In March 2024, the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes for $140.4 million in aggregate principal amount of the 7.00% Convertible Senior Notes due 2026 (the “7.00% Convertible Senior Notes”) as described in Note 9, “Convertible Senior Notes”. There were no conversions of the 7.00% Convertible Senior Notes for the three months ended March 31, 2024 and 2023.

5. Inventory

Inventory as of March 31, 2024 and December 31, 2023 consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Raw materials and supplies - production locations	$	543,196	$	564,818
Raw materials and supplies - customer locations		31,142		20,751
Work-in-process		156,146		149,574
Finished goods		245,414		226,110
Inventory	$	975,898	$	961,253

Inventory is primarily comprised of raw materials, work-in-process, and finished goods. The Company had inventory reserves made up of excess and obsolete items and related lower of cost or net realizable value adjustments of $117.7 million and $85.2 million as of March 31, 2024 and December 31, 2023, respectively.

6. Property, Plant and Equipment

Property, plant and equipment at March 31, 2024 and December 31, 2023 consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Land	$	5,951	$	6,049
Construction in progress		852,555		1,109,896
Hydrogen production plants		351,390		77,107
Building and leasehold improvements		96,850		95,229
Software, machinery, and equipment		243,198		229,352
Property, plant and equipment		1,549,944		1,517,633
Less: accumulated depreciation		(95,953)		(81,456)
Property, plant and equipment, net	$	1,453,991	$	1,436,177

Construction in progress is primarily comprised of construction of three hydrogen production plants. Completed assets are transferred to their respective asset classes, and depreciation begins when an asset is ready for its intended use. Interest on outstanding debt is capitalized during periods of capital asset construction and amortized over the useful lives of the related assets. During the three months ended March 31, 2024 and 2023, the Company capitalized $2.1 million and $2.0 million of interest, respectively.

Depreciation expense related to property, plant and equipment was $11.6 million and $5.5 million for the three months ended March 31, 2024 and 2023, respectively.

11

7. Intangible Assets

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of March 31, 2024 were as follows (in thousands):

	Weighted Average	Gross Carrying		Accumulated
	Amortization Period	Amount		Amortization		Total
Acquired technology	14 years	$	102,880	$	(21,979)	$	80,901
Dry stack electrolyzer technology	10 years		29,000		(6,042)		22,958
Customer relationships, trade name and other	13 years		103,002		(23,536)		79,466
		$	234,882	$	(51,557)	$	183,325

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2023 were as follows (in thousands):

	Weighted Average	Gross Carrying		Accumulated
	Amortization Period	Amount		Amortization		Total
Acquired technology	14 years	$	103,060	$	(20,204)	$	82,856
Dry stack electrolyzer technology	10 years		29,000		(5,317)		23,683
Customer relationships, trade name and other	13 years		103,981		(21,634)		82,347
		$	236,041	$	(47,155)	$	188,886

The change in the gross carrying amount of the acquired technology and customer relationships, trade name and other from December 31, 2023 to March 31, 2024 was due to changes in foreign currency translation.

Amortization expense for acquired identifiable intangible assets for the three months ended March 31, 2024 and 2023 was $4.4 million and $5.0 million, respectively.

The estimated amortization expense for subsequent years is as follows (in thousands):

Remainder of 2024	$	14,132
2025		18,070
2026		16,487
2027		16,480
2028		16,071
2029 and thereafter		102,085
Total	$	183,325

8. Long-Term Debt

In June 2020, the Company acquired debt as part of its acquisition of United Hydrogen Group Inc. During the three months ended March 31, 2024, the Company repaid $0.3 million of principal related to this outstanding debt. The outstanding carrying value of the debt was $3.8 million as of March 31, 2024. The remaining outstanding principal on the debt was $5.2 million and the unamortized debt discount was $1.4 million, bearing varying interest rates ranging from 7.3% to 7.6%. The debt is scheduled to mature in 2026. As of March 31, 2024, the principal balance is due at each of the following dates as follows (in thousands):

December 31, 2024		3,057
December 31, 2025		1,200
December 31, 2026		900
Total outstanding principal	$	5,157

12

9. Convertible Senior Notes

7.00% Convertible Senior Notes

On March 20, 2024, the Company entered into separate, privately negotiated exchange agreements with certain holders of the Company’s outstanding 3.75% Convertible Senior Notes pursuant to which the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes, and accrued and unpaid interest of $1.6 million on such notes to, but excluding, March 20, 2024, for $140.4 million in aggregate principal amount of the Company’s new 7.00% Convertible Senior Notes due 2026, in each case, pursuant to the exemption from registration provided by Section 4(a)(2) under the Securities Act of 1933, as amended (the “Securities Act”). Following the exchange, approximately $58.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes remained outstanding with terms unchanged.

This transaction was accounted for as an extinguishment of debt. As a result, the Company recorded a loss on extinguishment of debt of $14.0 million in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024. Loss on extinguishment of debt arises from the difference between the net carrying amount of the Company’s debt and the fair value of the assets transferred to extinguish the debt.

The 7.00% Convertible Senior Notes are the Company’s senior, unsecured obligations and are governed by the terms of an Indenture (the “Indenture”), dated as of March 20, 2024, entered into between the Company and Wilmington Trust, National Association, as trustee. The 7.00% Convertible Senior Notes bear cash interest at the rate of 7.00% per annum, payable semi-annually in arrears on June 1 and December 1 of each year, beginning on June 1, 2024, to holders of record at the close of business on the preceding May 15 and November 15, respectively. The 7.00% Convertible Senior Notes mature on June 1, 2026, unless earlier converted or redeemed or repurchased by the Company.

The conversion rate for the 7.00% Convertible Senior Notes is initially 235.4049 shares of the Company’s common stock per $1,000 principal amount of 7.00% Convertible Senior Notes, which is equivalent to an initial conversion price of approximately $4.25 per share of common stock, which represents a premium of approximately 20% over the last reported sale price of Plug’s common stock on the Nasdaq Capital Market on March 12, 2024. The conversion rate and conversion price are subject to customary adjustments upon the occurrence of certain events. Prior to the close of business on the business day immediately preceding December 1, 2025, the 7.00% Convertible Senior Notes will be convertible at the option of the holders of the 7.00% Convertible Senior Notes only upon the satisfaction of specified conditions and during certain periods. On or after December 1, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, the 7.00% Convertible Senior Notes will be convertible at the option of the holders of the 7.00% Convertible Senior Notes at any time regardless of these conditions. Conversions of the 7.00% Convertible Senior Notes will be settled in cash, shares of the Company’s common stock, or a combination thereof, at the Company’s election.

Subject to certain exceptions and subject to certain conditions, holders of the 7.00% Convertible Senior Notes may require the Company to repurchase their 7.00% Convertible Senior Notes upon the occurrence of a “Fundamental Change” (as defined in the Indenture) prior to maturity for cash at a repurchase price equal to 100% of the principal amount of the 7.00% Convertible Senior Notes to be repurchased plus accrued and unpaid interest, if any, to, but excluding, the repurchase date.

The 7.00% Convertible Senior Notes will be redeemable, in whole or in part, at the Company’s option at any time on or after June 5, 2025, at a cash redemption price equal to the principal amount of the 7.00% Convertible Senior Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, but only if the last reported sale price per share of the Company’s common stock exceeds 130% of the then-applicable conversion price then in effect for at least 20 trading days (whether or not consecutive), including at least one of the three trading days immediately preceding the date the Company sends the related redemption notice, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company sends such redemption notice.

13

In certain circumstances, conversions of 7.00% Convertible Senior Notes in connection with “Make-Whole Fundamental Changes” (as defined in the Indenture) or conversions of 7.00% Convertible Senior Notes called for redemption may result in an increase to the conversion rate, provided that the conversion rate will not exceed 282.4859 shares of the Company’s common stock per $1,000 principal amount of 7.00% Convertible Senior Notes, subject to adjustment. In such circumstance, a maximum of 39,659,890 shares of common stock, subject to adjustment, may be issued upon conversion of the 7.00% Convertible Senior Notes. There were no conversions of the 7.00% Convertible Senior Notes during the three months ended March 31, 2024.

The 7.00% Convertible Senior Notes consisted of the following (in thousands):

	March 31,
	2024
Principal amounts:
Principal	$	140,396
Unamortized debt premium, net of offering costs (1)		11,440
Net carrying amount	$	151,836

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

The following table summarizes the total interest expense and effective interest rate related to the 7.00% Convertible Senior Notes for the three months ended March 31, 2024 (in thousands, except for the effective interest rate):

	March 31,
	2024
Interest expense	$	296
Amortization of premium		(159)
Total	$	137
Effective interest rate		3.0%

The estimated fair value of the 7.00% Convertible Senior Notes at March 31, 2024 was approximately $153.2 million. The fair value estimation was primarily based on a quoted price in an active market.

3.75% Convertible Senior Notes

On May 18, 2020, the Company issued $200.0 million in aggregate principal amount of 3.75% Convertible Senior Notes due June 1, 2025 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act. On May 29, 2020, the Company issued an additional $12.5 million in aggregate principal amount of 3.75% Convertible Senior Notes. On March 12, 2024, the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes for $140.4 million in aggregate principal amount of the Company’s new 7.00% Convertible Senior Notes due 2026. Following the exchange, approximately $58.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes remained outstanding with terms unchanged. There were no conversions of the 3.75% Convertible Senior Notes during the three months ended March 31, 2024 and 2023.

14

The 3.75% Convertible Senior Notes consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Principal amounts:
Principal	$	58,462	$	197,278
Unamortized debt issuance costs (1)		(496)		(2,014)
Net carrying amount	$	57,966	$	195,264

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

The following table summarizes the total interest expense and effective interest rate related to the 3.75% Convertible Senior Notes for the three months ended March 31, 2024 and 2023 (in thousands, except for the effective interest rate):

	March 31,			March 31,
	2024			2023
Interest expense	$	1,690	$	1,849
Amortization of debt issuance costs		316		331
Total	$	2,006	$	2,180
Effective interest rate		4.5%		4.5%

The estimated fair value of the 3.75% Convertible Senior Notes at March 31, 2024 was approximately $60.4 million. The fair value estimation was primarily based on a quoted price in an active market.

Capped Call

In conjunction with the pricing of the 3.75% Convertible Senior Notes, the Company entered into privately negotiated capped call transactions (the “3.75% Notes Capped Call”) with certain counterparties at a price of $16.2 million. The 3.75% Notes Capped Call covers, subject to anti-dilution adjustments, the aggregate number of shares of the Company’s common stock that underlie the initial 3.75% Convertible Senior Notes and is generally expected to reduce potential dilution to the Company’s common stock upon any conversion of the 3.75% Convertible Senior Notes and/or offset any cash payments the Company is required to make in excess of the principal amount of the converted notes, as the case may be, with such reduction and/or offset subject to a cap based on the cap price. The cap price of the 3.75% Notes Capped Call is initially $6.7560 per share, which represents a premium of approximately 60% over the last then-reported sale price of the Company’s common stock of $4.11 per share on the date of the transaction and is subject to certain adjustments under the terms of the 3.75% Notes Capped Call. The 3.75% Notes Capped Call becomes exercisable if the conversion option is exercised.

The net cost incurred in connection with the 3.75% Notes Capped Call was recorded as a reduction to additional paid-in capital in the unaudited interim condensed consolidated balance sheets. The book value of the 3.75% Notes Capped Call is not remeasured.

5.5% Convertible Senior Notes and Common Stock Forward

In March 2018, the Company issued $100.0 million in aggregate principal amount of the 5.5% Convertible Senior Notes due on March 15, 2023, in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act, which have been fully repaid. In connection with the issuance of the 5.5% Convertible Senior Notes, the Company entered into a forward stock purchase transaction (the “Common Stock Forward”), pursuant to which the Company agreed to purchase 14,397,906 shares of its common stock for settlement on or about March 15, 2023. On May 18, 2020, the Company amended and extended the maturity of the Common Stock Forward to June 1, 2025. The number of shares of common stock that the Company will ultimately repurchase under the Common Stock Forward is subject to

15

customary anti-dilution adjustments. The Common Stock Forward is subject to early settlement or settlement with alternative consideration in the event of certain corporate transactions.

The net cost incurred in connection with the Common Stock Forward of $27.5 million was recorded as an increase in treasury stock in the unaudited interim condensed consolidated balance sheets. The related shares were accounted for as a repurchase of common stock. The book value of the Common Stock Forward is not remeasured.

There were no shares of common stock that settled in connection with the Common Stock Forward during the three months ended March 30, 2024 and 2023.

10. Stockholders’ Equity

At Market Issuance Sales Agreement

On January 17, 2024, the Company entered into an At Market Issuance Sales Agreement with B. Riley, pursuant to which the Company may, from time to time, offer and sell through or to B. Riley, as sales agent or principal, shares of the Company’s common stock, having an aggregate offering price of up to $1.0 billion. As of February 23, 2024, the Company had $697.9 million remaining authorized for issuance under the ATM Agreement. On February 23, 2024, the Company amended the ATM Agreement to increase the amount of shares of the Company’s common stock available for sale under the ATM Agreement to $1.0 billion. During the three months ended March 31, 2024, the Company sold 79,553,175 shares of common stock at a weighted-average sales price of $3.89 per share for gross proceeds of $309.3 million with related issuance costs of $3.9 million.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss is comprised of unrealized gains and losses on available-for-sale securities and foreign currency translation gains and losses. There were no reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2024 and 2023, respectively.

Net current-period other comprehensive loss for the three months ended March 31, 2024 increased due to foreign currency translation losses of $2.3 million. Net current-period other comprehensive income for the three months ended March 31, 2023 increased due to unrealized gains on available-for-sale securities of $5.3 million and foreign currency translation gains of $1.7 million.

11. Warrant Transaction Agreements

Amazon Transaction Agreement in 2022

On August 24, 2022, the Company and Amazon entered into a Transaction Agreement (the “2022 Amazon Transaction Agreement”), under which the Company concurrently issued to Amazon.com NV Investment Holdings LLC, a wholly owned subsidiary of Amazon, a warrant (the “2022 Amazon Warrant”) to acquire up to 16,000,000 shares (the “2022 Amazon Warrant Shares”) of the Company’s common stock, subject to certain vesting events described below. The Company and Amazon entered into the 2022 Amazon Transaction Agreement in connection with a concurrent commercial arrangement under which Amazon agreed to purchase hydrogen fuel from the Company through August 24, 2029.

1,000,000 of the 2022 Amazon Warrant Shares vested immediately upon issuance of the 2022 Amazon Warrant. 15,000,000 of the 2022 Amazon Warrant Shares will vest in multiple tranches over the 7-year term of the 2022 Amazon Warrant based on payments made to the Company directly by Amazon or its affiliates, or indirectly through third parties, with 15,000,000 of the 2022 Amazon Warrant Shares fully vesting if Amazon-related payments of $2.1 billion are made in the aggregate. The exercise price for the first 9,000,000 2022 Amazon Warrant Shares is $22.9841 per share and the fair value on the grant date was $20.36. The exercise price for the remaining 7,000,000 2022 Amazon Warrant Shares will be an amount per share equal to 90% of the 30-day volume weighted average share price of the Company’s common stock

16

as of the final vesting event that results in full vesting of the first 9,000,000 2022 Amazon Warrant Shares. The 2022 Amazon Warrant is exercisable through August 24, 2029.

Upon the consummation of certain change of control transactions (as defined in the 2022 Amazon Warrant) prior to the vesting of at least 60% of the aggregate 2022 Amazon Warrant Shares, the 2022 Amazon Warrant will automatically vest and become exercisable with respect to an additional number of 2022 Amazon Warrant Shares such that 60% of the aggregate 2022 Amazon Warrant Shares shall have vested. If a change of control transaction is consummated after the vesting of at least 60% of the aggregate 2022 Amazon Warrant Shares, then no acceleration of vesting will occur with respect to any of the unvested 2022 Amazon Warrant Shares as a result of the transaction. The exercise price and the 2022 Amazon Warrant Shares issuable upon exercise of the 2022 Amazon Warrant are subject to customary antidilution adjustments.

On August 24, 2022, 1,000,000 of the 2022 Amazon Warrant Shares associated with tranche 1 vested. The warrant fair value associated with the vested shares of tranche 1 of $20.4 million was capitalized to contract assets based on the grant date fair value and is subsequently amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement. As of March 31, 2024 the balance of the contract asset related to tranche 1 was $19.3 million which is recorded in contract assets in the Company’s unaudited interim condensed consolidated balance sheet. During the second quarter of 2023, all 1,000,000 of the 2022 Amazon Warrant Shares associated with tranche 2 vested. The warrant fair value associated with the vested shares of tranche 2 was $20.4 million and was determined on the grant date of August 24, 2022. As of March 31, 2024 the balance of the contract asset related to tranche 2 was $19.3 million. Tranche 3 will vest over the next $1.0 billion of collections from Amazon and its affiliates. The grant date fair value of tranche 3 will also be amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement. As of March 31, 2024 the balance of the contract asset related to tranche 3 was $2.0 million. Because the exercise price has yet to be determined, the fair value of tranche 4 will be remeasured at each reporting period end and amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement.

As of March 31, 2024 and December 31, 2023, 2,000,000 of the 2022 Amazon Warrant Shares had vested and the 2022 Amazon Warrant had not been exercised. The total amount of provision for common stock warrants recorded as a reduction of revenue for the 2022 Amazon Warrant during the three months ended March 31, 2024 and 2023 was $0.7 million and $1.1 million, respectively.

The assumptions used to calculate the valuations of the 2022 Amazon Warrant as of August 24, 2022 and March 31, 2024 are as follows:

	Tranches 1-3	Tranche 4
	August 24, 2022	March 31, 2024
Risk-free interest rate	3.15%	4.12%
Volatility	75.00%	90.00%
Expected average term (years)	7.00	4.00
Exercise price	$22.98	$3.10
Stock price	$20.36	$3.44

Amazon Transaction Agreement in 2017

On April 4, 2017, the Company and Amazon entered into a Transaction Agreement (the “2017 Amazon Transaction Agreement”), pursuant to which the Company agreed to issue to Amazon.com NV Investment Holdings LLC, a warrant (the “2017 Amazon Warrant”) to acquire up to 55,286,696 shares (the “2017 Amazon Warrant Shares”), subject to certain vesting events. The Company and Amazon entered into the 2017 Amazon Transaction Agreement in connection with existing commercial agreements between the Company and Amazon with respect to the deployment of the Company’s GenKey fuel cell technology at Amazon distribution centers. The vesting of the 2017 Amazon Warrant Shares was conditioned upon payments made by Amazon or its affiliates (directly or indirectly through third parties) pursuant to existing commercial agreements. On December 31, 2020, the Company waived the remaining vesting conditions under

17

the 2017 Amazon Warrant, which resulted in the immediate vesting of all of the third tranche of the 2017 Amazon Warrant Shares.

As of March 31, 2024 and 2023, all 55,286,696 of the 2017 Amazon Warrant Shares had vested and the 2017 Amazon Warrant was exercised with respect to 34,917,912 shares of the Company’s common stock. The total amount of provision for common stock warrants recorded as a reduction of revenue for the 2017 Amazon Warrant during the three months ended March 31, 2024 and 2023 was $0.1 million and $0.2 million, respectively.

Walmart Transaction Agreement

On July 20, 2017, the Company and Walmart entered into a Transaction Agreement (the “Walmart Transaction Agreement”), pursuant to which the Company agreed to issue to Walmart a warrant (the “Walmart Warrant”) to acquire up to 55,286,696 shares of the Company’s common stock, subject to certain vesting events (the “Walmart Warrant Shares”). The Company and Walmart entered into the Walmart Transaction Agreement in connection with existing commercial agreements between the Company and Walmart with respect to the deployment of the Company’s GenKey fuel cell technology across various Walmart distribution centers. The existing commercial agreements contemplate, but do not guarantee, future purchase orders for the Company’s fuel cell technology. The vesting of the warrant shares was conditioned upon payments made by Walmart or its affiliates (directly or indirectly through third parties) pursuant to transactions entered into after January 1, 2017 under existing commercial agreements.

The exercise price for the first and second tranches of Walmart Warrant Shares was $2.1231 per share. After Walmart has made payments to the Company totaling $200.0 million, the third tranche of 20,368,784 Walmart Warrant Shares will vest in eight installments of 2,546,098 Walmart Warrant Shares each time Walmart or its affiliates, directly or indirectly through third parties, make an aggregate of $50.0 million in payments for goods and services to the Company, up to payments totaling $400.0 million in the aggregate. The exercise price of the third tranche of the Walmart Warrant Shares is $6.28 per share, which was determined pursuant to the terms of the Walmart Warrant as an amount equal to 90% of the 30-day volume weighted average share price of the Company’s common stock as of October 30, 2023, the final vesting date of the second tranche of the Walmart Warrant Shares. The Walmart Warrant is exercisable through July 20, 2027. The Walmart Warrant provides for net share settlement that, if elected by the holder, will reduce the number of shares issued upon exercise to reflect net settlement of the exercise price. The Walmart Warrant provides for certain adjustments that may be made to the exercise price and the number of shares of common stock issuable upon exercise due to customary anti-dilution provisions based on future events. The Walmart Warrant is classified as an equity instrument.

As of March 31, 2024 and December 31, 2023, 37,464,010 and 34,917,912 of the Walmart Warrant Shares had vested, respectively, and the Walmart Warrant was exercised with respect to 13,094,217 shares of the Company’s common stock. As of March 31, 2024, the balance of the contract asset related to the Walmart Warrant was $6.9 million. The total amount of provision for common stock warrants recorded as a reduction of revenue for the Walmart Warrant during the three months ended March 31, 2024 and 2023 was $3.7 million and $12.9 million, respectively.

The assumptions used to calculate the valuations of the Walmart Warrant as of January 1, 2019 and October 30, 2023 are as follows:

	Tranches 1-2	Tranche 3
	January 1, 2019	October 30, 2023
Risk-free interest rate	2.63%	4.73%
Volatility	95.00%	75.00%
Expected average term (years)	8.55	3.72
Exercise price	$2.12	$6.28
Stock price	$1.24	$5.70

18

12. Revenue

Disaggregation of revenue

The following table provides information about disaggregation of revenue (in thousands):

Major products/services lines	Three months ended
	March 31,
	2024		2023
Sales of fuel cell systems	$	19,003	$	28,852
Sales of hydrogen infrastructure		12,295		48,868
Sales of electrolyzers		1,351		40,032
Sales of engineered equipment		4,216		7,753
Services performed on fuel cell systems and related infrastructure		13,023		9,097
Power purchase agreements		18,304		7,937
Fuel delivered to customers and related equipment		18,286		10,142
Sales of cryogenic equipment and other		31,430		56,589
Other		2,356		1,016
Net revenue	$	120,264	$	210,286

Contract balances

The following table provides information about receivables, contract assets and deferred revenue and contract liabilities from contracts with customers (in thousands):

	March 31,		December 31,
	2024		2023
Accounts receivable	$	148,822	$	243,811
Contract assets		160,374		155,989
Deferred revenue and contract liabilities		255,802		288,302

Contract assets primarily relate to contracts for which revenue is recognized on a straight-line basis; however, billings escalate over the life of a contract. Contract assets also include amounts recognized as revenue in advance of billings to customers, which are dependent upon the satisfaction of another performance obligation. These amounts are included in contract assets on the accompanying unaudited interim condensed consolidated balance sheets.

The deferred revenue and contract liabilities relate to the advance consideration received from customers for services that will be recognized over time (primarily fuel cell and related infrastructure services and electrolyzer systems and solutions). Deferred revenue and contract liabilities also include advance consideration received from customers prior to delivery of products. These amounts are included within deferred revenue and other contract liabilities on the unaudited interim condensed consolidated balance sheets.

19

Significant changes in the contract assets and the deferred revenue and contract liabilities balances during the period are as follows (in thousands):

Contract assets	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Transferred to receivables from contract assets recognized at the beginning of the period	$	(9,082)	$	(94,860)
Change in contract assets related to warrants		5,850		14,260
Impairment		—		(2,375)
Revenue recognized and not billed as of the end of the period		7,617		134,677
Net change in contract assets	$	4,385	$	51,702

Deferred revenue and contract liabilities	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Increases due to customer billings, net of amounts recognized as revenue during the period	$	12,057	$	151,965
Change in contract liabilities related to warrants		110		440
Revenue recognized that was included in the contract liability balance as of the beginning of the period		(44,667)		(94,001)
Net change in deferred revenue and contract liabilities	$	(32,500)	$	58,404

Estimated future revenue

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period, including provision for common stock warrants (in thousands):

	March 31,		Expected recognition
	2024		period (years)
Sales of fuel cell systems	$	55,671		1 - 2
Sales of hydrogen installations and other infrastructure		31,039		1
Sales of electrolyzers		303,127		1 - 2
Sales of engineered equipment		14,559		1
Services performed on fuel cell systems and related infrastructure		142,111		5 - 10
Power purchase agreements		419,406		5 - 10
Fuel delivered to customers and related equipment		93,685		5 - 10
Sales of cryogenic equipment and other		77,105		1
Total estimated future revenue	$	1,136,703

13. Income Taxes

The Company recorded $0.2 million of income tax expense and $1.3 million of income tax benefit for the three months ended March 31, 2024 and 2023, respectively. The income tax expense for the three months ended March 31, 2024 was due to an incremental change to the valuation allowance recorded in foreign jurisdictions. The Company has not changed its overall conclusion with respect to the need for a valuation allowance against its domestic net deferred tax assets, which remain fully reserved, and its valuation allowances recorded in foreign jurisdictions.

The domestic net deferred tax asset generated from the Company’s net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized. The Company recognizes accrued interest and penalties related to unrecognized tax benefits, if any, as a component of income tax expense.

20

The Organization for Economic Co-operation and Development Inclusive Framework on Base Erosion and Profit Shifting has proposed a global minimum corporate tax rate of 15% on multi-national corporations, commonly referred to as the Pillar Two rules that has been agreed upon in principle by over 140 countries. Numerous foreign countries have enacted legislation to implement the Pillar Two rules, effective beginning January 1, 2024, or are expected to enact similar legislation. As of March 31, 2024, the Company did not meet the consolidated revenue threshold and is not subject to the GloBE Rules under Pillar Two. The Company will continue to monitor the implementation of rules in the jurisdictions in which it operates.

14. Fair Value Measurements

The Company records the fair value of assets and liabilities in accordance with ASC 820, Fair Value Measurement (“ASC 820”). ASC 820 defines fair value as the price received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and in the principal or most advantageous market for that asset or liability. The fair value should be calculated based on assumptions that market participants would use in pricing the asset or liability, not on assumptions specific to the entity.

In addition to defining fair value, ASC 820 expands the disclosure requirements around fair value and establishes a fair value hierarchy for valuation inputs. The hierarchy prioritizes the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of the three levels, which is determined by the lowest level input that is significant to the fair value measurement in its entirety.

These levels are:

● Level 1 — quoted prices (unadjusted) in active markets for identical assets or liabilities.

● Level 2 — quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.

● Level 3 — unobservable inputs reflecting management’s own assumptions about the inputs used in pricing the asset or liability at fair value.

There were no transfers between Level 1, Level 2, or Level 3 for the three months ended March 31, 2024. Financial instruments not recorded at fair value on a recurring basis include equity method investments that have not been remeasured or impaired in the current period, such as our investments in HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund.

Assets and liabilities measured at fair value on a recurring basis are summarized below (in thousands):

		As of March 31, 2024
		Carrying		Fair		Fair Value Measurements
		Amount		Value		Level 1		Level 2		Level 3
Liabilities
Contingent consideration	$	106,326	$	106,326	$	—	$	—	$	106,326

	As of December 31, 2023
	Carrying	Fair	Fair Value Measurements
	Amount	Value	Level 1	Level 2	Level 3
Liabilities
Contingent consideration	126,216	126,216	—	—	126,216

The liabilities measured at fair value on a recurring basis that have unobservable inputs and are therefore categorized as level 3 are related to contingent consideration. The fair value as of March 31, 2024 of $106.3 million is comprised of contingent consideration related to the Joule Processing LLC (“Joule”) acquisition in 2022, the Frames Holding B.V. (“Frames”) acquisition in 2021 and the Giner ELX, Inc. (“Giner”) and United Hydrogen Group Inc. (“UHG”) acquisitions in 2020.

In connection with the Joule acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $41.7 million representing the fair value of contingent consideration payable. The

21

fair value of this contingent consideration was $58.0 million and $75.5 million as of March 31, 2024 and December 31, 2023, respectively. The decrease compared to the year ended December 31, 2023 was partially due to payments that reduced the fair value of the liability by $10.0 million during the three months ended March 31, 2024. A further decrease of $7.5 million was recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024.

In connection with the Frames acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $29.1 million representing the fair value of contingent consideration payable. The fair value of this contingent consideration was $28.6 million and $31.8 million as of March 31, 2024 and December 31, 2023, respectively. The decrease compared to the year ended December 31, 2023 was primarily due to a decrease of $2.5 million recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024. A further decrease of $0.7 million was due to foreign currency translation gains.

In connection with the Giner acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $16.0 million representing the fair value of contingent consideration payable. The fair value of this contingent consideration was $18.7 million and $18.0 million as of March 31, 2024 and December 31, 2023, respectively. The increase compared to December 31, 2023 was recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024.

In connection with the UHG acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $1.1 million representing the fair value of contingent consideration payable. The fair value of this contingent consideration was $1.0 million and $0.9 million as of March 31, 2024 and December 31, 2023, respectively. The increase compared to December 31, 2023 was recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024, respectively.

In the unaudited interim condensed consolidated balance sheets, contingent consideration is recorded in the contingent consideration, loss accrual for service contracts, and other current liabilities financial statement line item, and was comprised of the following unobservable inputs as of March 31, 2024:

Financial Instrument	Fair Value		Valuation Technique	Unobservable Input	Range (weighted average)
Contingent consideration	$	106,326	Scenario based method	Credit spread	13.61% - 14.04%
				Discount rate	17.98% - 19.06%
		106,326

In the unaudited interim condensed consolidated balance sheets, contingent consideration is recorded in the contingent consideration, loss accrual for service contracts, and other current liabilities financial statement line item, and was comprised of the following unobservable inputs as of December 31, 2023:

Financial Instrument	Fair Value		Valuation Technique	Unobservable Input	Range (weighted average)
Contingent consideration	$	126,216	Scenario based method	Credit spread	13.61%
				Discount rate	17.71% - 19.06%
		126,216

22

The change in the carrying amount of Level 3 liabilities during the three months ended March 31, 2024 was as follows (in thousands):

	Three months ended
	March 31, 2024
Beginning balance as of December 31, 2023	$	126,216
Cash payments		(10,000)
Fair value adjustments		(9,200)
Foreign currency translation adjustment		(690)
Ending balance as of March 31, 2024	$	106,326

15. Investments

Equity Method Investments

As of March 31, 2024 and December 31, 2023, the Company accounted for the following investments in the investee’s common stock under the equity method, which are included in the investments in non-consolidated entities and non-marketable equity securities on the unaudited interim condensed consolidated balance sheets (amounts in thousands):

		As of March 31, 2024			As of December 31, 2023
	Formation	Common Stock	Carrying		Common Stock	Carrying
Investee	Date	Ownership %	Value		Ownership %	Value
HyVia	Q2 2021	50%	$	1,402	50%	$	(2,068)
AccionaPlug	Q4 2021	50%		4,371	50%		3,198
Clean H2 Infra Fund	Q4 2021	5%		17,428	5%		13,357
SK Plug Hyverse	Q1 2022	49%		37,871	49%		41,609
			$	61,072		$	56,096

As of December 31, 2023, the Company’s investment in HyVia was negative due to historical losses. The Company is committed to fund its share of losses of the joint venture and, therefore, continued to record losses as incurred. The negative equity investment as of December 31, 2023 was recorded on the unaudited interim condensed consolidated balance sheet to the contingent consideration, loss accrual for service contracts, and other liabilities financial statement line item.

During the three months ended March 31, 2024, the Company contributed approximately $16.2 million, $1.7 million, $0 and $4.0 million, respectively, to HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund. During the three months ended March 31, 2023, the Company contributed approximately $22.3 million, $0, $17.8 million and $0, respectively, to HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund.

The Company’s capital commitments related to its equity method investments as of March 31, 2024 includes $98.1 million to be made during the remainder of 2024.

16. Operating and Finance Lease Liabilities

As of March 31, 2024, the Company had operating leases, as lessee, primarily associated with sale/leaseback transactions that are partially secured by restricted cash and security deposits (see also Note 18, “Commitments and Contingencies”) as summarized below. These leases expire over the next one to seven years. Minimum rent payments under operating leases are recognized on a straight-line basis over the term of the lease.

Leases contain termination clauses with associated penalties, the amount of which cause the likelihood of cancellation to be remote. At the end of the lease term, the leased assets may be returned to the lessor by the Company, the Company may negotiate with the lessor to purchase the assets at fair market value, or the Company may negotiate with the lessor to renew the lease at market rental rates. No residual value guarantees are contained in the leases. No financial covenants are contained within the lease; however, the lease contains customary operational covenants such as the requirement that the Company properly maintain the leased assets and carry appropriate insurance. The leases include

23

credit support in the form of either cash, collateral or letters of credit. See Note 18, “Commitments and Contingencies”, for a description of cash held as security associated with the leases.

The Company has finance leases associated with its property and equipment in Latham, New York and at fueling customer locations.

Future minimum lease payments under operating and finance leases (with initial or remaining lease terms in excess of one year) as of March 31, 2024 were as follows (in thousands):

			Finance		Total
	Operating Lease		Lease		Lease
	Liability		Liability		Liabilities
Remainder of 2024	$	74,684	$	9,089	$	83,773
2025		94,822		15,030		109,852
2026		85,950		12,172		98,122
2027		72,561		8,482		81,043
2028		50,427		1,896		52,323
2029 and thereafter		147,725		3,243		150,968
Total future minimum payments		526,169		49,912		576,081
Less imputed interest		(182,699)		(6,637)		(189,336)
Total	$	343,470	$	43,275	$	386,745

Rental expense for all operating leases was $26.3 million and $21.9 million for the three months ended March 31, 2024 and 2023, respectively.

At both March 31, 2024 and December 31, 2023, security deposits associated with sale/leaseback transactions were $7.4 million, and were included in other assets in the unaudited interim condensed consolidated balance sheets.

Other information related to the operating leases are presented in the following table:

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments - operating cash flows (in thousands)	$	24,960	$	21,648
Weighted average remaining lease term (years)		7.21		2.66
Weighted average discount rate		11.5%		11.3%

Finance lease costs include amortization of the right of use assets (i.e., depreciation expense) and interest on lease liabilities (i.e., interest and other expense, net in the unaudited interim condensed consolidated statement of operations), and were $1.9 million and $1.1 million for the three months ended March 31, 2024, and 2023, respectively.

At March 31, 2024 and December 31, 2023, the right of use assets associated with finance leases, net was $56.1 million and $57.3 million, respectively. The accumulated depreciation for these right of use assets was $10.1 million and $9.0 million at March 31, 2024 and December 31, 2023, respectively.

24

Other information related to the finance leases are presented in the following table:

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments - operating cash flows (in thousands)	$	764	$	766
Cash payments - financing cash flows (in thousands)	$	2,272	$	2,059
Weighted average remaining lease term (years)		3.66		3.78
Weighted average discount rate		6.8%		6.7%

17. Finance Obligation

The Company has sold future services to be performed associated with certain sale/leaseback transactions and recorded the balance as a finance obligation. The outstanding balance of this obligation at March 31, 2024 was $333.0 million, $75.7 million and $257.3 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The outstanding balance of this obligation at December 31, 2023 was $350.8 million, $74.0 million and $276.8 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The amount is amortized using the effective interest method. Interest expense recorded related to finance obligations for the three months ended March 31, 2024 and 2023 was $10.0 million and $9.2 million, respectively.

In prior periods, the Company entered into sale/leaseback transactions that were accounted for as financing transactions and reported as part of finance obligations. The outstanding balance of finance obligations related to sale/leaseback transactions at March 31, 2024 was $16.8 million, $9.5 million and $7.3 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The outstanding balance of this obligation at December 31, 2023 was $17.6 million, $10.0 million and $7.6 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet.

Future minimum payments under finance obligations notes above as of March 31, 2024 were as follows (in thousands):

					Total
	Sale of Future		Sale/Leaseback		Finance
	Revenue - Debt		Financings		Obligations
Remainder of 2024	$	82,353	$	9,924	$	92,277
2025		104,547		2,229		106,776
2026		87,824		2,229		90,053
2027		71,253		2,229		73,482
2028		51,188		2,015		53,203
2029 and thereafter		25,503		1,131		26,634
Total future minimum payments		422,668		19,757		442,425
Less imputed interest		(89,647)		(2,993)		(92,640)
Total	$	333,021	$	16,764	$	349,785

25

Other information related to the above finance obligations are presented in the following table:

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments (in thousands)	$	28,660	$	24,311
Weighted average remaining term (years)		4.27		4.76
Weighted average discount rate		11.3%		11.2%

The fair value of the Company’s total finance obligations approximated their carrying value as of March 31, 2024 and December 31, 2023.

18. Commitments and Contingencies

Restricted Cash

In connection with certain of the above noted sale/leaseback agreements, cash of $552.8 million and $573.5 million was required to be restricted as security as of March 31, 2024 and December 31, 2023, respectively, which restricted cash will be released over the lease term. As of March 31, 2024 and December 31, 2023, the Company also had certain letters of credit backed by security deposits totaling $351.8 million and $370.7 million, respectively, of which $321.0 million and $340.0 million are security for the above noted sale/leaseback agreements, respectively, and $30.8 million and $30.7 million are customs related letters of credit, respectively.

As of March 31, 2024 and December 31, 2023, the Company had $76.9 million and $76.8 million held in escrow related to the construction of certain hydrogen production plants, respectively.

The Company also had $1.2 million and $0.2 million of consideration held by our paying agent in connection with each of the Joule and CIS acquisitions, respectively, reported as restricted cash as of March 31, 2024, with a corresponding accrued liability on the Company’s unaudited interim condensed consolidated balance sheet. Additionally, the Company had $12.3 million and $11.7 million in restricted cash as collateral resulting from the Frames acquisition as of March 31, 2024 and December 31, 2023, respectively.

Litigation

Legal matters are defended and handled in the ordinary course of business. The outcome of any such matters, regardless of the merits, is inherently uncertain; therefore, assessing the likelihood of loss and any estimated damages is difficult and subject to considerable judgment. We describe below those legal matters for which a material loss is either (i) possible but not probable, and/or (ii) not reasonably estimable at this time. Liabilities for loss contingencies arising from claims, assessments, litigation, fines, and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred. The Company has not recorded any accruals related to any legal matters.

Securities Litigation and Related Stockholder Derivative Litigation

2021 Securities Action and Related Derivative Litigation

Two actions are pending in which alleged stockholders of the Company assert claims derivatively, on the Company’s behalf, based on allegations and claims that had been asserted in a putative securities class action, In re Plug Power, Inc. Securities Litigation, No. 1:21-cv-2004 (S.D.N.Y. (the “2021 Securities Action”). In an opinion and order entered in August 2023, the district court dismissed the 2021 Securities Action with prejudice, and the plaintiffs in that action did not appeal.

A consolidated stockholder derivative action relating to the claims and allegations in the 2021 Securities Action is pending in the Court of Chancery for the State of Delaware, styled In re Plug Power Inc. Stockholder Derivative

26

Litigation, Cons. C.A. No. 2022-0569-KSJM (Del. Ch.). By stipulation and order, the consolidated action was stayed until motions to dismiss were finally resolved in the 2021 Securities Action. On March 8, 2024, the alleged stockholder plaintiffs filed a consolidated amended complaint in which claims have been asserted against our officers Andrew J. Marsh, Paul B. Middleton, Gerard L. Conway, Jr., and Keith Schmid, and against our current or former directors George C. McNamee, Gary K. Willis, Maureen O. Helmer, Johannes M. Roth, Gregory L. Kenausis, Lucas Schneider, and Jonathan Silver. The Company is named as nominal defendant. Based on allegations in the first and second amended complaints in the 2021 Securities Action, the plaintiffs assert claims against the individual defendants for alleged breaches of fiduciary duty, disgorgement, and unjust enrichment based on alleged transactions in the Company’s securities while allegedly in possession of material non-public information concerning (i) the Company’s financial accounting prior to the announcement that the Company would need to restate certain financial statements and (ii) the potential amendment and termination of a warrant agreement between the Company and a significant customer. Defendants’ responses to the complaint are due by May 10, 2024.

On May 13, 2021, alleged stockholder Romario St. Clair filed a complaint in the Supreme Court of the State of New York, County of New York, asserting claims derivatively on behalf of the Company against certain current or former directors and officers of the Company. The action is styled St. Clair v. Plug Power Inc. et al., Index No. 653167/2021 (N.Y. Sup. Ct., N.Y. Cty.). By stipulation and order, the action was stayed until motions to dismiss were finally resolved in the 2021 Securities Action. On March 25, 2024, the alleged stockholder plaintiff filed an amended complaint in which claims have been asserted against Mr. Marsh, Mr. Middleton, Mr. McNamee, Mr. Willis, Ms. Helmer, Mr. Kenausis, Mr. Roth, Mr. Schneider, and Mr. Silver, with the Company named as nominal defendant. As had been alleged in the 2021 Securities Action, the amended complaint alleges that the individual defendants knew or consciously disregarded that the Company was experiencing known but undisclosed material weaknesses in its internal controls over financial reporting and had made certain accounting errors later corrected in the Company’s financial restatement in 2021. The complaint further alleges that Mr. Marsh and Mr. Middleton engaged in transactions in the Company’s securities before these issues were disclosed. The plaintiff asserts claims against the individual defendants, derivatively on behalf of the Company, for breach of fiduciary and unjust enrichment. Defendants’ responses to the amended complaint are due by May 21, 2024.

2023 Securities Action and Related Derivative Litigation

A consolidated action is pending in the United States District Court for the District of Delaware asserting claims under the federal securities laws against the Company and certain of its senior officers on behalf of a putative class of purchasers of the Company’s securities, styled In re Plug Power, Inc. Securities Litigation, No. 1:23-cv-00576-MN (the “2023 Securities Action”). The plaintiffs filed a consolidated complaint on September 28, 2023, in which they assert claims under the federal securities laws against the Company and four of its senior officers, Mr. Marsh, Mr. Middleton, Sanjay Shrestha, and former officer David Mindnich, on behalf of a putative class of purchasers of Plug Power common stock between January 19, 2022 and March 1, 2023. The complaint alleges that the defendants made “materially false and/or misleading statements” about the Company’s business and operations, including that “the Company was unable to effectively manage its supply chain and product manufacturing, resulting in reduced revenues and margins, increased inventory levels, and several large deals being delayed until at least 2023, among other issues The defendants filed a motion to dismiss the complaint on December 14, 2023, and briefing was completed in March 2024. All proceedings are stayed pending resolution of the motion to dismiss.

Beginning on September 13, 2023, three separate actions were filed in the U.S. District Court for the District of Delaware and in the U.S. District Court for the Southern District of New York asserting claims derivatively and on behalf of the Company against certain former and current Company officers and directors based on the claims asserted in the 2023 Securities Action. Those cases have been consolidated in the District of Delaware under the caption In re Plug Power, Inc. Stockholder Deriv. Litig., No. 1:23-cv-01007-MN (D. Del.). The defendants named in the constituent complaint were Mr. Marsh, Mr. Middleton, Mr. Mindnich, Martin Hull, Ms. Helmer, Mr. Kenausis, Mr. McNamee, Mr. Schneider, Mr. Silver, Mr. Willis, and current or former directors Jean Bua, Kavita Mahtani, and Kyungyeol Song. In an order entered on April 26, 2024, the Court approved the parties’ stipulation to stay all proceedings until motions to dismiss have been resolved in the 2023 Securities Action.

27

2024 Securities Litigation

On March 22, 2024, Ete Adote filed a complaint in the United States District Court for the Northern District of New York asserting claims under the federal securities laws against the Company, Mr. Marsh, and Mr. Middleton, on behalf of an alleged class of purchasers of Plug common stock between May 9, 2023 and January 16, 2024, styled Adote v. Plug Power, Inc. et al., No. 1:24-cv-00406-MAD-DJS (N.D.N.Y.). The allegations in the 2024 Securities Action are substantially similar to those in the consolidated 2023 Securities Action but cover a different putative class period that extends into 2024. On April 30, 2024, a second complaint asserting substantially similar claims against the same defendants, but on behalf of a putative class of purchasers of Plug Power common stock between March 1, 2023 and January 16, 2024, was filed in the Northern District of New York, styled Lee v. Plug Power, et al., No. 1:24;cv-0598-MAD-DJS (N.D.N.Y.).

Other Litigation

On May 2, 2023, a lawsuit entitled Jacob Thomas and JTurbo Engineering & Technology, LLC v. Joule Processing, LLC and Plug Power Inc., Case No. 4:23-cv-01615, was filed in the United States District Court for the Southern District of Texas against Joule Processing, LLC and Plug Power Inc. The complaint alleges misappropriation of trade secrets under both the federal Defend Trade Secrets Act of 2016, 18 U.S.C. § 1836, and the Texas Uniform Trade Secrets Act, three breach of contract claims, and four common law claims under Texas law. On December 5, 2023, the Court granted, in part, the partial motion to dismiss filed by Joule Processing, LLC and Plug Power Inc., and the Court dismissed with prejudice one of the breach of contract claims and the four common law claims. The Court also transferred another of the breach of contract claims to the United States District Court for the Northern District of New York, Case No. 1:23-cv-01528. That claim was dismissed without prejudice, and that matter was closed on April 4, 2024. Currently pending before the United States District Court for the Southern District of Texas is Plaintiff[s’] Verified Amended Application for Temporary Restraining Order, Preliminary Injunction and Permanent Injunctive Relief (the “Amended Application for Injunctive Relief”). Joule Processing, LLC and Plug Power Inc. filed their Response in Opposition to the Amended Application for Injunctive Relief on March 27, 2024, and Jacob Thomas and JTurbo Engineering & Technology, LLC filed their Reply in Support of the Amended Application for Injunctive Relief on April 4, 2024.

On May 10, 2023, an action entitled Ringling v. Plug Power, Inc., et al, Case No. 1:23-cv-572, was filed in the U.S. District Court for the Northern District of New York asserting claims pursuant to 42 U.S.C. § 1981, Title VII of the Civil Rights Act of 1964, and the New York State Human Rights Law against the Company, Tom Rourke, individually, and/or Tom O’Grady, individually. The complaint asserts that the plaintiff is seeking damages to redress injuries suffered as a result of harassment and discrimination on the basis of his race, together with creating a hostile work environment, failure to promote, retaliation, and constructive discharge. The parties entered into a settlement agreement and filed a stipulation of dismissal.

On July 24, 2023, an action entitled Felton v. Plug Power, Inc., Case No. 1:23-cv-887, was filed in the U.S. District Court for the Northern District of New York asserting claims against the Company pursuant to the New York State Human Rights Law. The complaint asserts that the plaintiff is seeking damages to redress injuries suffered as a result of harassment and discrimination on the basis of his race, together with creating a hostile work environment, and retaliation. Plug disagrees with plaintiff’s representations about his time at Plug and intends to vigorously defend against his allegations. Plaintiff’s counsel moved to withdraw from the case, which the court approved on March 18, 2024, and therefore plaintiff is now pro se.

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to credit risk consist principally of cash, cash equivalents, restricted cash and accounts receivable. Cash and restricted cash are maintained in accounts with financial institutions, which, at times may exceed the Federal depository insurance coverage of $250 thousand. The Company has not experienced losses on these accounts and management believes, based upon the quality of the financial institutions, that the credit risk with regard to these deposits is not significant.

28

Concentrations of credit risk with respect to receivables exist due to the limited number of select customers with whom the Company has commercial sales arrangements. To mitigate credit risk, the Company performs appropriate evaluation of a prospective customer’s financial condition.

At March 31, 2024, three customers comprised approximately 30.3% of the Company’s consolidated accounts receivable balance. At December 31, 2023, one customer comprised approximately 21.5% of the Company’s consolidated accounts receivable balance.

For purposes of assigning a customer to a sale/leaseback transaction completed with a financial institution, the Company considers the end user of the assets to be the ultimate customer. For the three months ended March 31, 2024, two customers accounted for 44.2% of total consolidated revenues. For the three months ended March 31, 2023, two customers accounted for 25.5% of total consolidated revenues.

Guarantee

On May 30, 2023, our joint venture, HyVia, entered into a government grant agreement with Bpifrance. As part of the agreement, our wholly-owned subsidiary, Plug Power France, was required to issue a guarantee to Bpifrance in the amount of €20 million through the end of January 2027. Plug Power France is liable to the extent of the guarantee for sums due to Bpifrance from HyVia under the agreement based on the difference between the total amount paid by Bpifrance and the final amount certified by HyVia and Bpifrance. As part of the agreement, there are certain milestones that HyVia is required to meet, and the nonperformance of these milestones or termination of this agreement could result in this guarantee being called upon. As of March 31, 2024, no payments related to this guarantee have been made by the Company and Plug Power France did not record a liability for this guarantee as the likelihood of the guarantee being called upon is remote.

Unconditional Purchase Obligations

The Company has entered into certain off–balance sheet commitments that require the future purchase of goods or services (“unconditional purchase obligations”). The Company’s unconditional purchase obligations primarily consist of supplier arrangements, take or pay contracts and service agreements. For certain vendors, the Company’s unconditional obligation to purchase a minimum quantity of raw materials at an agreed upon price is fixed and determinable; while certain other raw material costs will vary due to product forecasting and future economic conditions.

Future payments under non-cancelable unconditional purchase obligations with a remaining term in excess of one year as of March 31, 2024, were as follows (in thousands):

Remainder of 2024	$	37,742
2025		8,023
2026		8,023
2027		2,638
2028		—
2029 and thereafter		—
Total		56,426

19. Employee Benefit Plans

2011 and 2021 Stock Option and Incentive Plan

The Company has issued stock-based awards to employees and members of its Board of Directors (the “Board”) consisting of stock options and restricted stock and restricted stock unit awards. The Company accounts for all stock-based awards to employees and members of the Board as compensation costs in the consolidated financial statements based on their fair values measured as of the date of grant. These costs are recognized over the requisite service period. Stock-based compensation costs recognized, excluding the Company’s matching contributions of $3.2 million to the Plug Power Inc.

29

401(k) Savings & Retirement Plan and quarterly Board compensation, were $10.4 million and $40.2 million for the three months ended March 31, 2024 and 2023, respectively. The methods and assumptions used in the determination of the fair value of stock-based awards are consistent with those described in our 2023 Form 10-K.

The components and classification of stock-based compensation expense, excluding the Company’s matching contributions to the Plug Power Inc. 401(k) Savings & Retirement Plan and quarterly Board compensation, were as follows (in thousands):

	Three months ended
	March 31, 2024		March 31, 2023
Cost of sales	$	2,006	$	2,677
Research and development		2,342		2,283
Selling, general and administrative		6,023		35,221
	$	10,371	$	40,181

Option Awards

The Company issues options that are time and performance-based awards. All option awards are determined to be classified as equity awards.

Service Stock Options Awards

The following table reflects the service stock option activity for the three months ended March 31, 2024:

				Weighted
		Weighted		Average
		Average		Remaining		Aggregate
		Exercise		Contractual		Intrinsic
	Shares	Price		Terms		Value
Options outstanding at December 31, 2023	17,336,362	$	11.37		7.86	$	11,391
Options exercisable at December 31, 2023	8,288,944		11.84		6.18		7,250
Options unvested at December 31, 2023	9,047,418		10.94		9.39		4,141
Granted	313,000		3.28		—		—
Exercised	(20,000)		2.10		—		—
Forfeited	(920,300)		19.42		—		—
Options outstanding at March 31, 2024	16,709,062	$	10.79		7.60	$	3,858
Options exercisable at March 31, 2024	8,334,755		11.93		5.90		3,792
Options unvested at March 31, 2024	8,374,307	$	9.65		9.29	$	66

The weighted average grant date fair value of the service stock options granted during the three months ended March 31, 2024 and 2023 was $2.41 and $10.48, respectively. The total intrinsic fair value of service stock options exercised during the three months ended March 31, 2024 and 2023 was $30 thousand and $1.3 million, respectively. The total fair value of the service stock options that vested during the three months ended March 31, 2024 and 2023 was approximately $6.1 million and $7.5 million, respectively.

Compensation cost associated with service stock options represented approximately $6.9 million and $8.2 million of the total share-based payment expense recorded for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, there was approximately $40.7 million of unrecognized compensation cost related to service stock option awards to be recognized over the weighted average remaining period of 1.99 years.

30

Performance Stock Option Awards

The following table reflects the performance stock option award activity for the three months ended March 31, 2024. Solely for the purposes of this table, the number of performance options is based on participants earning the maximum number of performance options (i.e. 200% of the target number of performance options):

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Shares	Price		Terms	Value
Options outstanding at December 31, 2023	21,925,000	$	21.32	5.27	$	—
Options exercisable at December 31, 2023	2,782,000		26.9	4.7		—
Options unvested at December 31, 2023	19,143,000		20.50	5.35		—
Granted	—		—	—		—
Exercised	—		—	—		—
Forfeited	(2,250,000)		—	—		—
Options outstanding at March 31, 2024	19,675,000	$	21.44	4.95	$	—
Options exercisable at March 31, 2024	2,782,000		26.92	4.48		—
Options unvested at March 31, 2024	16,893,000	$	20.54	5.03	$	—

The weighted average grant-date fair value of the performance stock options granted during the three months ended March 31, 2024 and 2023 was $0, respectively. There were no performance stock options exercised during the three months ended March 31, 2024 or 2023. The total fair value of the performance stock options that vested was $0 during the three months ended March 31, 2024 and 2023, respectively.

Compensation cost associated with performance stock options represented approximately ($6.1) million and $17.4 million of the total share-based payment expense recorded for the three months ended March 31, 2024 and 2023, respectively. Compensation cost for the three months ended March 31, 2024 includes non-cash reversals due to forfeitures of unvested performance stock options of ($15.2) million during the period. The non-cash compensation expense reversals were offset by compensation costs of $9.1 million during the three months ended March 31, 2024. As of March 31, 2024, there was approximately $21.0 million of unrecognized compensation cost related to performance stock option awards to be recognized over the weighted average remaining period of 1.38 years.

As of March 31, 2024, there were 3,904,333 unvested performance stock options for which the employee requisite service period had not been rendered but were expected to vest. The aggregate intrinsic value of these unvested performance stock options was $0 as of March 31, 2024. The weighted average exercise price of these unvested performance stock options was $14.66 and the weighted average remaining contractual term was 5.54 years as of March 31, 2024.

Restricted Common Stock and Restricted Stock Unit Awards

The following table reflects the restricted stock and restricted stock unit activity for the three months ended March 31, 2024 (in thousands except share amounts):

		Weighted		Aggregate
		Average Grant Date		Intrinsic
	Shares	Fair Value		Value
Unvested restricted stock and restricted stock units at December 31, 2023	6,732,884	$	15.66	$	30,298
Granted	17,000		5.23		—
Vested	(230,675)		28.42		—
Forfeited	(604,353)		18.69		—
Unvested restricted stock and restricted stock units at March 31, 2024	5,914,856	$	14.82	$	20,347

31

The weighted average grant-date fair value of the restricted common stock and restricted stock unit awards granted during the three months ended March 31, 2024 and 2023 was $5.23 and $15.44, respectively. The total fair value of restricted shares of common stock and restricted stock unit awards that vested for the three months ended March 31, 2024 and 2023 was $6.6 million and $13.5 million, respectively.

Compensation cost associated with restricted common stock and restricted stock unit awards represented approximately $9.6 million and $14.6 million for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, there was $63.3 million of unrecognized compensation cost related to restricted stock and restricted common stock unit awards to be recognized over the weighted average period of 1.85 years.

Included in the total unvested restricted common stock and restricted stock units as of March 31, 2024, there were 375,000 restricted common stock units outstanding with a performance target. The Company recorded expense associated with the restricted common stock units with a performance target of $0.6 million for the three months ended March 31, 2024. As of March 31, 2024 there was $2.5 million of unrecognized compensation cost related to the restricted common stock units outstanding with a performance target to be recognized over the weighted average period of 2.33 years.

401(k) Savings & Retirement Plan

The Company issued 895,258 shares of common stock and 219,970 shares of common stock pursuant to the Plug Power Inc. 401(k) Savings & Retirement Plan during the three months ended March 31, 2024 and 2023, respectively.

The Company’s expense for this plan was approximately $3.2 million and $3.0 million for the three months ended March 31, 2024 and 2023, respectively.

Non-Employee Director Compensation

The Company granted 53,598 shares of common stock and 10,316 shares of common stock to non-employee directors as compensation for the three months ended March 31, 2024 and 2023, respectively. All common stock issued is fully vested at the time of issuance and is valued at fair value on the date of issuance. The Company’s share-based compensation expense in connection with non-employee director compensation was approximately $0.2 million and $0.1 million for the three months ended March 31, 2024 and 2023, respectively.

20. Accrued Expenses

Accrued expenses at March 31, 2024 and December 31, 2023 consisted of (in thousands):

	March 31,		December 31,
	2024		2023
Accrued payroll and compensation related costs	$	24,193	$	32,584
Accrual for capital expenditures		48,072		83,781
Accrued accounts payable		63,435		64,767
Accrued sales and other taxes		17,738		17,207
Accrued interest		969		562
Accrued other		407		1,643
Total	$	154,814	$	200,544

21. Segment and Geographic Area Reporting

Our organization is managed from a sales perspective based on “go-to-market” sales channels, emphasizing shared learning across end-user applications and common supplier/vendor relationships. These sales channels are structured to serve a range of customers for our products and services. As a result of this structure, we concluded that we have one operating and reportable segment — the design, development and sale of hydrogen products and solutions that help customers meet their business goals while decarbonizing their operations. Our chief executive officer was identified as the chief operating decision maker (CODM). All significant operating decisions made by management are largely based

32

upon the analysis of Plug Power Inc. on a total company basis, including assessments related to our incentive compensation plans.

The revenue and long-lived assets based on geographic location are as follows (in thousands):

	Revenues				Long-Lived Assets
	Three months ended				As of
	March 31, 2024		March 31, 2023		March 31, 2024		December 31, 2023
North America	$	105,914	$	161,807	$	1,904,277	$	1,881,315
Europe		8,571		40,153		108,869		122,489
Asia		5,074		3,255		—		—
Other		705		5,071		1,286		884
Total	$	120,264	$	210,286	$	2,014,432	$	2,004,688

22. Related Party Transactions

HyVia

Our 50/50 joint venture, HyVia, manufactures and sells fuel cell powered electric light commercial vehicles (“FCE-LCVs”) and supplies hydrogen fuel and fueling stations to support the FCE-LCV market, in each case primarily in Europe. For the three months ended March 31, 2024 and 2023, we recognized related party total revenue of $3.1 million and $3.8 million, respectively. As of March 31, 2024 and December 31, 2023, we had related party outstanding accounts receivable of $2.8 million and $2.3 million, respectively.

SK Plug Hyverse

Our 49/51 joint venture, SK Plug Hyverse, aims to provide hydrogen fuel cell systems, hydrogen fueling stations, electrolyzers and clean hydrogen to the Korean and other selected Asian markets. For the three months ended March 31, 2024 and 2023, we recognized related party total revenue of $3.4 million and $0.2 million, respectively. As of March 31, 2024 and December 31, 2023, we had related party outstanding accounts receivable of $4.3 million and $1.7 million, respectively.

23. Restructuring

In February 2024, in a strategic move to enhance our financial performance and ensure long-term value creation in a competitive market, we approved a comprehensive initiative that encompasses a broad range of measures, including operational consolidation, strategic workforce adjustments, and various other cost-saving actions (the “Restructuring Plan”). These measures are aimed at increasing efficiency, improving scalability, and maintaining our leadership position in the renewable energy industry. We began executing the Restructuring Plan in February 2024 and expect the Restructuring Plan to be completed in the second half of 2024, subject to local law and consultation requirements.

The determination of when we accrue for involuntary termination benefits under restructuring plans depends on whether the termination benefits are provided under an ongoing benefit arrangement or under a one-time benefit arrangement. We account for involuntary termination benefits that are provided pursuant to one-time benefit arrangements in accordance with ASC 420, Exit or Disposal Cost Obligations (“ASC 420”) whereas involuntary termination benefits that are part of an ongoing written or substantive plan are accounted for in accordance with ASC 712, Nonretirement Postemployment Benefits. We accrue a liability for termination benefits under ASC 420 in the period in which the plan is communicated to the employees and the plan is not expected to change significantly. For ongoing benefit arrangements, inclusive of statutory requirements, we accrue a liability for termination benefits under ASC 712 when the existing situation or set of circumstances indicates that an obligation has been incurred, it is probable the benefits will be paid, and the amount can be reasonably estimated. The restructuring charges that have been incurred but not yet paid are recorded in accrued expenses and other current liabilities in our unaudited interim condensed consolidated balance sheets, as they are expected to be paid within the next twelve months.

33

During the three months ended March 31, 2024, we incurred $6.0 million in restructuring costs recorded as severance expenses of $5.2 million, and other restructuring costs of $0.8 million in the restructuring financial statement line item in the unaudited interim condensed consolidated statement of operations. We expect to incur another $1.1 million in restructuring costs in subsequent quarters, which are primarily related to severance expenses, and are expected to be incurred during the third quarter of 2024. The actual timing and amount of costs associated with these restructuring actions may differ from our current expectations and estimates and such differences may be material.

Severance expense recorded during the three months ended March 31, 2024 in accordance with ASC 420 was a result of the separation of full-time employees associated with the Restructuring Plan. As of March 31, 2024, $0.8 million of accrued severance-related costs were included in accrued expenses in our unaudited interim condensed consolidated balance sheets and are expected to be paid during the third quarter of 2024. Other costs are represented by (1) $0.2 million of legal and professional services costs, and (2) $0.6 million of other one-time employee termination benefits. As of March 31, 2024, $0.1 million of accrued other costs were included in accrued expenses in our unaudited interim condensed consolidated balance sheets and are expected to be paid during the third quarter of 2024.

24. Subsequent Events

Common Stock At Market Issuance Sales Agreement

From March 31, 2024 through the date of filing of the Quarterly Report on Form 10-Q, the Company sold 55,801,292 shares of common stock at a weighted-average sales price of $2.65 per share for gross proceeds of $147.8 million with related issuance costs of $2.6 million.

34

Item 2 — Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with our accompanying unaudited interim condensed consolidated financial statements and notes thereto included within this Quarterly Report on Form 10-Q, and our audited and notes thereto included in our 2023 Form 10-K. In addition to historical information, this Quarterly Report on Form 10-Q and the following discussion contain statements that are not historical facts and are considered forward-looking within the meaning of Section 27A of the Securities Act, and Section 21E of the Exchange Act. These forward-looking statements contain projections of our future results of operations or of our financial position or state other forward-looking information. In some cases, you can identify these statements by forward-looking words such as “believe”, “could”, “continue”, “estimate”, “expect”, “forecast”, “intend”, “may”, “should”, “will”, “would”, “plan”, “project” or the negative of such words or other similar words or phrases. We believe that it is important to communicate our future expectations to our investors. However, there may be events in the future that we are not able to accurately predict or control and that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements. Investors are cautioned not to unduly rely on forward-looking statements because they involve risks and uncertainties, and actual results may differ materially from those discussed as a result of various factors, including, but not limited to:

● the anticipated benefits and actual savings and costs resulting from the implementation of the Restructuring Plan that was announced in February 2024;

● our ability to achieve our business objectives and to continue to meet our obligations, which is dependent upon our ability to maintain a certain level of liquidity and will depend in part on our ability to manage our cash flows, including successfully implementing our cost savings initiatives;

● the risk that we continue to incur losses and might never achieve or maintain profitability;

● the risk that we will need to raise additional capital to fund our operations and such capital may not be available to us;

● the risk that we may not be able to expand our business or manage our future growth effectively;

● the risk of loss related to an inability to remediate the material weaknesses identified in internal control over financial reporting as of December 31, 2023 or inability to otherwise maintain an effective system of internal control over financial reporting;

● the risk that delays in or not completing our product development and hydrogen plant construction goals may adversely affect our revenue and profitability;

● the risk that we may not be able to obtain from our hydrogen suppliers a sufficient supply of hydrogen at competitive prices or the risk that we may not be able to produce hydrogen internally at competitive prices;

● our ability to achieve the forecasted revenue and costs on the sale of our products;

● the risk that we may not be able to convert all of our estimated future revenue into revenue and cash flows;

● the risk that purchase orders may not ship, be installed and/or converted to revenue, in whole or in part;

● the risk that some or all of the recorded intangible assets and property, plant, and equipment could be subject to impairment;

● the risks associated with global economic uncertainty, including inflationary pressures, fluctuating interest rates, currency fluctuations, and supply chain disruptions;

● the risk of elimination, reduction of, or changes in qualifying criteria for government subsidies and economic incentives for alternative energy products, including with regards to the impact of the Inflation Reduction Act on our business;

● the risk that our lack of extensive experience in manufacturing and marketing of certain of our products may impact our ability to manufacture and market said products on a profitable and large-scale commercial basis;

● the risk that a sale or issuance of a significant number of shares of stock could depress the market price of our common stock;

● the risk of dilution to our stockholders and/or impact to our stock price should we need to raise additional capital;

● the risk that negative publicity related to our business or stock could result in a negative impact on our stock value and profitability;

● our ability to leverage, attract and retain key personnel;

● the risk of increased costs associated with legal proceedings and legal compliance;

35

● the risk that a loss of one or more of our major customers, or the delay in payment or the failure to pay receivables by one of our major customers, could have a material adverse effect on our financial condition;

● the risk of potential losses related to any contract disputes;

● the risk of potential losses related to any product liability claims;

● the cost and timing of developing, marketing, and selling our products;

● the risks involved with participating in joint ventures, including our ability or inability to execute our strategic growth plan through joint ventures;

● our ability to obtain financing arrangements to support the sale or leasing of our products and services to customers;

● the cost and availability of fuel and fueling infrastructures for our products;

● the risk that our convertible senior notes, if settled in cash, could have a material adverse effect on our financial results;

● the risk that our convertible note hedges may affect the value of our convertible senior notes and our common stock;

● the risks related to the use of flammable fuels in our products;

● the risks, liabilities, and costs related to environmental, health, and safety matters;

● market acceptance of our products and services;

● our ability to establish and maintain relationships with third parties with respect to product development, manufacturing, distribution, and servicing, and the supply of key product components;

● the risk that we may be unable to successfully pursue, integrate, or execute upon our new business ventures;

● the cost and availability of components and parts for our products;

● the risk that possible new tariffs could have a material adverse effect on our business;

● our ability to develop commercially viable products;

● our ability to reduce product and manufacturing costs;

● our ability to successfully market, distribute and service our products and services internationally;

● our ability to improve system reliability for our products;

● competitive factors, such as price competition and competition from other traditional and alternative energy companies;

● our ability to protect our intellectual property;

● the risks related to our operational dependency on information technology and the risk of the failure of such technology, including failure to effectively prevent, detect, and recover from security compromises or breaches, including cyber-attacks;

● the cost of complying with current and future federal, state and international governmental regulations;

● the risks associated with past and potential future acquisitions;

● the risks associated with geopolitical instability, including the conflicts in the Middle East and between Russia and Ukraine as well as tensions between U.S. and China and neighboring regions; and

● the volatility of our stock price.

The risks included here are not exhaustive, and additional factors could adversely affect our business and financial performance, including factors and risks discussed in the section titled “Risk Factors” included under Part I, Item 1A, in our 2023 Form 10-K and supplemented by Part II, Item 1A of this Quarterly Report on Form 10-Q. Moreover, we operate in a very competitive and rapidly changing environment. New risk factors emerge from time to time, and it is not possible for management to predict all such risk factors, nor can we assess the impact of all such risk factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from these contained in any forward-looking statements. While forward-looking statements reflect our good faith beliefs, they are not guarantees of future performance. These forward-looking statements speak only as of the date on which the statements were made. Except as may be required by applicable law, we do not undertake or intend to update any forward-looking statements after the date of this Quarterly Report on Form 10-Q.

References in this Quarterly Report on Form 10-Q to “Plug”, the “Company”, “we”, “our” or “us” refer to Plug Power Inc., including as the context requires, its subsidiaries.

36

Overview

Plug is facilitating the paradigm shift to an increasingly electrified world by innovating cutting-edge hydrogen and fuel cell solutions.

While we continue to develop commercially viable hydrogen and fuel cell product solutions, we have expanded our offerings to support a variety of commercial operations that can be powered with clean hydrogen. We provide electrolyzers that allow customers — such as refineries, producers of chemicals, steel, fertilizer and commercial refueling stations — to generate hydrogen on-site. We are focusing our efforts on (a) industrial mobility applications, including electric forklifts and electric industrial vehicles, at multi shift high volume manufacturing and high throughput distribution sites where we believe our products and services provide a unique combination of productivity, flexibility, and environmental benefits; (b) production of hydrogen; and (c) stationary power systems that will support critical operations, such as data centers, microgrids, and generation facilities, in either a backup power or continuous power role, and replace batteries, diesel generators or the grid for telecommunication logistics, transportation, and utility customers. Plug expects to support these products and customers with an ecosystem of vertically integrated products that produce, transport, store and handle, dispense, and use hydrogen for mobility and power applications.

Our current product and service portfolio includes:

GenDrive: GenDrive is our hydrogen fueled PEM fuel cell system, providing power to material handling electric vehicles (“EVs”), including Class 1, 2, 3 and 6 electric forklifts, automated guided vehicles, and ground support equipment.

GenSure: GenSure is our stationary fuel cell solution providing scalable, modular PEM fuel cell power to support the backup and grid-support power requirements of the telecommunications, transportation, and utility sectors; our GenSure High Power Fuel Cell Platform supports large scale stationary power and data center markets.

Progen: Progen is our fuel cell stack and engine technology currently used globally in mobility and stationary fuel cell systems, and as engines in electric delivery vans. This includes Plug’s membrane electrode assembly (“MEA”), a critical component of the fuel cell stack used in zero-emission fuel cell EV engines.

GenFuel: GenFuel is our liquid hydrogen fueling, delivery, generation, storage, and dispensing system.

GenCare: GenCare is our ongoing “Internet of Things”-based maintenance and on-site service program for GenDrive fuel cell systems, GenSure fuel cell systems, GenFuel hydrogen storage and dispensing products and Progen fuel cell engines.

GenKey: GenKey is our vertically integrated “turn-key” solution combining either GenDrive or GenSure fuel cell power with GenFuel fuel and GenCare aftermarket service, offering complete simplicity to customers transitioning to fuel cell power.

Electrolyzers: The design and implementation of 5MW and 10MW electrolyzer systems that are modular, scalable hydrogen generators optimized for clean hydrogen production. Electrolyzers generate hydrogen from water using electricity and a special membrane and “green” hydrogen is generated by using renewable energy inputs, such as solar or wind power.

Liquefaction Systems: Plug’s 15 ton-per-day and 30 ton-per-day liquefiers are engineered for high efficiency, reliability, and operational flexibility — providing consistent liquid hydrogen to customers. This design increases plant reliability and availability while minimizing parasitic losses like heat leak and seal gas losses.

Cryogenic Equipment: Engineered equipment including trailers and mobile storage equipment for the distribution of liquified hydrogen, oxygen, argon, nitrogen and other cryogenic gases.

37

Liquid Hydrogen: Liquid hydrogen provides an efficient fuel alternative to fossil-based energy. We produce liquid hydrogen through our electrolyzer systems and liquefaction systems. Liquid hydrogen supply will be used by customers in material handling operations, fuel cell electric vehicle fleets, and stationary power applications.

We provide our products and solutions worldwide through our direct sales force, and by leveraging relationships with original equipment manufacturers (“OEMs”) and their dealer networks. Plug is currently targeting Asia, Australia, Europe, Middle East and North America for expansion in adoption. The European Union has rolled out ambitious targets for the hydrogen economy, with the United Kingdom also taking steps in this direction, and Plug is seeking to execute on our strategy to become one of the European leaders in the hydrogen economy. This includes a targeted account strategy for material handling, securing strategic partnerships with European OEMs, energy companies, utility leaders and accelerating our electrolyzer business.

We manufacture our commercially viable products in Latham, New York; Rochester, New York; Slingerlands, New York; Houston, Texas; Lafayette, Indiana; and Spokane, Washington, and support liquid hydrogen production and logistics in Charleston, Tennessee and Kingsland, Georgia.

Results of Operations

Our primary sources of revenue are from sales of equipment, related infrastructure and other, services performed on fuel cell systems and related infrastructure, power purchase agreements, and fuel delivered to customers and related equipment. A certain portion of our sales result from acquisitions in legacy markets, which we are working to transition to renewable solutions. Revenue from sales of equipment, related infrastructure and other represents sales of our GenDrive units, GenSure stationary backup power units, cryogenic stationary and on road storage, hydrogen liquefaction systems, electrolyzers and hydrogen fueling infrastructure. Revenue from services performed on fuel cell systems and related infrastructure represents revenue earned on our service and maintenance contracts and sales of spare parts. Revenue from power purchase agreements primarily represent payments received from customers who make monthly payments to access the Company’s GenKey solution. Revenue associated with fuel delivered to customers and related equipment represents the sale of hydrogen to customers that has been purchased by the Company from a third party or generated at our hydrogen production plant.

Provision for Common Stock Warrants

On August 24, 2022, the Company issued to Amazon.com NV Investment Holdings LLC, a wholly owned subsidiary of Amazon, a warrant (the “2022 Amazon Warrant”) to acquire up to 16,000,000 shares (the “2022 Amazon Warrant Shares”) of the Company’s common stock, par value $.01 per share (the “common stock”), subject to certain vesting events described below under “Common Stock Transactions – Amazon Transaction Agreement in 2022”.

In 2017, in separate transactions, the Company issued a warrant to each of Amazon.com NV Investment Holdings LLC and Walmart to purchase up to 55,286,696 shares of the Company’s common stock, subject to certain vesting events described below under “Common Stock Transactions – Amazon Transaction Agreement in 2017” and “Common Stock Transactions – Walmart Transaction Agreement”. The Company recorded a portion of the estimated fair value of the warrants as a reduction of revenue based upon the projected number of shares of common stock expected to vest under the warrants, the proportion of purchases by Amazon, Walmart and their affiliates within the period relative to the aggregate purchase levels required for vesting of the respective warrants, and the then-current fair value of the warrants.

38

The amount of provision for the Amazon and Walmart Warrants recorded as a reduction of revenue during the three months ended March 31, 2024 and 2023, respectively, is shown in the table below (in thousands):

	Three months ended
	March 31, 2024		March 31, 2023
Sales of equipment, related infrastructure and other	$	(2,267)	$	(434)
Services performed on fuel cell systems and related infrastructure		(448)		(374)
Power purchase agreements		(1,074)		(7,185)
Fuel delivered to customers and related equipment		(706)		(6,182)
Total	$	(4,495)	$	(14,175)

Net revenue, cost of revenue, gross profit/(loss) and gross margin/(loss) for the three months ended March 31, 2024 and 2023 were as follows (in thousands):

			Cost of		Gross		Gross
	Net Revenue		Revenue		Profit/(Loss)		Margin/(Loss)
For the year ended March 31, 2024:
Sales of equipment, related infrastructure and other	$	68,295	$	135,125	$	(66,830)	(97.9)	%
Services performed on fuel cell systems and related infrastructure		13,023		12,957		66	0.5	%
Provision for loss contracts related to service		—		15,745		(15,745)	N/A
Power purchase agreements		18,304		55,228		(36,924)	(201.7)	%
Fuel delivered to customers and related equipment		18,286		58,573		(40,287)	(220.3)	%
Other		2,356		1,711		645	27.4	%
Total	$	120,264	$	279,339	$	(159,075)	(132.3)	%
For the year ended March 31, 2023:
Sales of equipment, related infrastructure and other	$	182,094	$	158,320	$	23,774	13.1	%
Services performed on fuel cell systems and related infrastructure		9,097		12,221		(3,124)	(34.3)	%
Provision for loss contracts related to service		—		6,889		(6,889)	N/A
Power purchase agreements		7,937		46,816		(38,879)	(489.8)	%
Fuel delivered to customers and related equipment		10,142		54,501		(44,359)	(437.4)	%
Other		1,016		935		81	8.0	%
Total	$	210,286	$	279,682	$	(69,396)	(33.0)	%

Net Revenue

Revenue – sales of equipment, related infrastructure and other. Revenue from sales of equipment, related infrastructure and other represents sales of our GenDrive units, GenSure stationary backup power units, cryogenic stationary and on road storage, hydrogen liquefaction systems, electrolyzers and hydrogen fueling infrastructure referred to at the site level as hydrogen installations. Revenue from sales of equipment, related infrastructure and other for the three months ended March 31, 2024 decreased $113.8 million, or 62.5%, to $68.3 million from $182.1 million for the three months ended March 31, 2023. The revenue related to electrolyzers decreased $38.7 million, primarily due to a decrease in 1MW electrolyzer stack sales during the three months ended March 31, 2024 compared to the three months ended March 31, 2023. The decrease in hydrogen infrastructure revenue of $36.6 million was due to three hydrogen site installations for the three months ended March 31, 2024 compared to 14 for the three months ended March 31, 2023. Additionally, revenue from cryogenic storage equipment and liquefiers decreased $25.2 million for the three months ended March 31, 2024 primarily due to a slower rate of progress on existing projects as they near completion compared to the rate of progress for three months ended March 31, 2023. The decrease in revenue related to fuel cell systems of $9.8 million was due to the mix of class types sold during the three months ended March 31, 2024 as well as a higher concentration of direct sales compared to the three months ended March 31, 2023. Additionally, there was a decrease in revenue of $3.5 million related to decreased sales of engineered equipment from the Frames acquisition, for which sales are not expected to continue beyond current commitments. Included in the above, there was an increase in the provision for common stock warrants recorded as a reduction of revenue, which increased to $2.3 million for the three months ended March 31, 2024 compared to $0.4 million for the three months ended March 31, 2023.

Revenue – services performed on fuel cell systems and related infrastructure. Revenue from services performed on fuel cell systems and related infrastructure represents revenue earned on our service and maintenance contracts and sales of spare parts. Revenue from services performed on fuel cell systems and related infrastructure for the three months ended March 31, 2024 increased $3.9 million, or 43.2%, to $13.0 million from $9.1 million for the three months ended

39

March 31, 2023. The increase in revenue from services performed on fuel cell systems and related infrastructure was primarily related to the increase in number of units in service, with the number of GenDrive units under maintenance contracts during the three months ended March 31, 2024 of 21,948 compared to 20,154 for the three months ended March 31, 2023, coupled with an increase in service rates negotiated with certain customers.

Revenue – power purchase agreements. Revenue from Power Purchase Agreements (“PPAs”) represents payments received from customers for power generated through the provision of equipment and service. Revenue from PPAs for the three months ended March 31, 2024 increased $10.4 million, or 130.6%, to $18.3 million from $7.9 million for the three months ended March 31, 2023. The increase in revenue was a result of an increase in the number of units and customer sites party to these agreements. There were 32,026 GenDrive units under PPA arrangements during the three months ended March 31, 2024 compared to 28,253 during the three months ended March 31, 2023. In addition, there were 146 hydrogen sites under PPA arrangements during the three months ended March 31, 2024 compared to 117 during the three months ended March 31, 2023. Also, both pricing rates and mix of units to new customer sites were favorable in the first quarter of 2024 compared to the first quarter of 2023. In addition, there was a decrease in the provision for common stock warrants recorded as a reduction of revenue, which decreased to $1.1 million for the three months ended March 31, 2024 compared to $7.2 million for the three months ended March 31, 2023.

Revenue – fuel delivered to customers and related equipment. Revenue associated with fuel and related equipment delivered to customers represents the sale of hydrogen that has been purchased by the Company from a third party or generated at our hydrogen production plant. Revenue associated with fuel delivered to customers for the three months ended March 31, 2024 increased $8.1 million, or 80.3%, to $18.3 million from $10.1 million for the three months ended March 31, 2023. The increase in revenue was primarily due to a decrease in the provision for common stock warrants recorded as a reduction of revenue, which decreased to $0.7 million for the three months ended March 31, 2024 compared to $6.2 million for the three months ended March 31, 2023. Additionally, there was an increase in the number of sites with fuel contracts, with 253 sites receiving fuel delivery as of March 31, 2024 compared to 210 sites as of March 31, 2023.

Cost of Revenue

Cost of revenue – sales of equipment, related infrastructure and other. Cost of revenue from sales of equipment, related infrastructure and other includes direct materials, labor costs, and allocated overhead costs related to the manufacture of our fuel cells such as GenDrive units and GenSure stationary back-up power units, cryogenic stationary and on road storage, and electrolyzers, as well as hydrogen fueling infrastructure referred to at the site level as hydrogen installations. Cost of revenue from sales of equipment, related infrastructure and other for the three months ended March 31, 2024 decreased $23.2 million, or 14.7%, to $135.1 million from $158.3 million for the three months ended March 31, 2023. The cost of revenue related to hydrogen infrastructure decreased $17.9 million due to the decrease in the number of hydrogen site installations, with three hydrogen site installations for the three months ended March 31, 2024 compared to 14 for the three months ended March 31, 2023. The cost of revenue related to electrolyzer stacks and systems decreased $14.8 million, which was due to one 1MW equivalent units sold for the three months ended March 31, 2024 compared to 62 1MW equivalent units sold for the three months ended March 31, 2023. The decrease in cryogenic storage equipment and liquefiers cost of revenue of $13.6 million for the three months ended March 31, 2024 is primarily due to a slower rate of progress on existing projects as they near completion compared to the rate of progress for the three months ended March 31, 2023. Additionally, there was a decrease in cost of revenue of $1.9 million related to decreased sales of engineered equipment from the Frames acquisition, for which sales are not expected to continue beyond current commitments. Partially offsetting these decreases was an increase in the cost of revenue related to fuel cell systems of $25.0 million due to an increase in the volume of GenDrive units sold, with 1,298 units sold for the three months ended March 31, 2024 compared to 1,035 units sold for the three months ended March 31, 2023. Gross loss generated from sales of equipment, related infrastructure and other was (97.9%) for the three months ended March 31, 2024 compared to a gross margin of 13.1% for the three months ended March 31, 2023. The decrease from gross margin to gross loss was primarily due to: customer mix, lower margins on new product offerings, inventory valuation adjustments and decline in volume due to timing of deployments which impacted leveraging of labor and overhead in the first quarter of 2024.

Cost of revenue – services performed on fuel cell systems and related infrastructure. Cost of revenue from services performed on fuel cell systems and related infrastructure includes the labor, material costs and allocated overhead

40

costs incurred for our product service and hydrogen site maintenance contracts and spare parts. Cost of revenue from services performed on fuel cell systems and related infrastructure for the three months ended March 31, 2024 increased $0.7 million, or 6.0%, to $13.0 million from $12.2 million for the three months ended March 31, 2023. The increase in cost of revenue was primarily due to the increase in number of units and sites in service. There were 21,948 fuel cell units and 106 hydrogen installations under extended maintenance contracts as of March 31 2024, an increase from 20,154 fuel cell units and 95 hydrogen installations as of March 31, 2023. Gross margin increased to 0.5% for the three months ended March 31, 2024 compared to gross loss of (34.3%) for the three months ended March 31, 2023. The increase in gross margin was primarily due to an increase in negotiated rates discussed above, as well as an increase in the release of the loss accrual during the three months ended March 31, 2024.

Cost of revenue – provision for loss contracts related to service. The Company also recorded a provision for loss contracts related to service of $15.7 million for the three months ended March 31, 2024 compared to $6.9 million for the three months ended March 31, 2023. The Company increased the provision due to continued cost and inflationary increases of labor, parts and related overhead coupled with the timing of the remaining period of service required. Accordingly, the Company increased its estimated projected costs to service fuel cell systems and related infrastructure.

Cost of revenue – power purchase agreements. Cost of revenue from PPAs includes depreciation of assets utilized and service costs to fulfill PPA obligations and interest costs associated with certain financial institutions for leased equipment. Cost of revenue from PPAs for the three months ended March 31, 2024 increased $8.4 million, or 18.0%, to $55.2 million from $46.8 million for the three months ended March 31, 2023. The increase in cost was primarily a result of an increase in units and sites under PPA contracts as well as increased freight costs. There were 32,026 GenDrive units under PPA arrangements during the three months ended March 31, 2024 compared to 28,253 during the three months ended March 31, 2023. In addition, there were 146 hydrogen sites under PPA arrangements during the three months ended March 31, 2024 compared to 117 during the three months ended March 31, 2023. Gross loss decreased to (201.7%) for the three months ended March 31, 2024 compared to (489.8%) for the three months ended March 31, 2023. The decrease in gross loss was primarily due to improved pricing and mix of units as well as a decrease in provision for common stock warrants.

Cost of revenue – fuel delivered to customers and related equipment. Cost of revenue from fuel delivered to customers and related equipment represents the purchase of hydrogen from suppliers and internally produced hydrogen that is ultimately sold to customers. Cost of revenue from fuel delivered to customers for the three months ended March 31, 2024 increased $4.1 million, or 7.5%, to $58.6 million from $54.5 million for the three months ended March 31, 2023. The increase was primarily due to higher volume of hydrogen delivered to customer sites as a result of an increase in the number of hydrogen installations completed under GenKey agreements, inefficiencies in fueling systems, and increased logistics costs to cover the hydrogen network while our Georgia plant was ramping to full production. There were 253 sites receiving fuel delivery as of March 31, 2024 compared to 210 sites as of March 31, 2023. Gross loss decreased to (220.3%) during the three months ended March 31, 2024 compared to (437.4%) during the three months ended March 31, 2023. The decrease in gross loss was primarily due to lower provision for warrants for the period ending March 31, 2024 compared to 2023.

Expenses

Research and development expense. Research and development expenses include: materials to build development and prototype units, cash and non-cash compensation and benefits for the engineering and related staff, expenses for contract engineers, fees paid to consultants for services provided, materials and supplies consumed, facility related costs such as computer and network services, and other general overhead costs associated with our research and development activities. Research and development expense for the three months ended March 31, 2024 decreased $1.2 million, or 4.5%, to $25.3 million from $26.5 million for the three months ended March 31, 2023. The decrease was primarily related to a decrease in component materials.

Selling, general and administrative expenses. Selling, general and administrative expenses include cash and non-cash compensation, benefits, amortization of intangible assets and related costs in support of our general corporate functions, including general management, finance and accounting, human resources, selling and marketing, information

41

technology and legal services. Selling, general and administrative expenses for the three months ended March 31, 2024 decreased $26.1 million, or 25.1%, to $78.0 million from $104.0 million for the three months ended March 31, 2023. The decrease was primarily due to a decrease in stock compensation of $29.2 million, of which $17.2 million was related to forfeitures resulting from the Restructuring Plan announced in February 2024.

Restructuring. Expenses related to the Restructuring Plan for the three months ended March 31, 2024 was $6.0 million. The increase was due to severance and benefits related to the Restructuring Plan the Company announced in February 2024.

Impairment. Impairment for the three months ended March 31, 2024 decreased $0.8 million, or 73.8%, to $0.3 million from $1.1 million for the three months ended March 31, 2023. The decrease was primarily related to the Company recording a lower impairment charge on long-lived assets during the three months ended March 31, 2024.

Change in fair value of contingent consideration. The change in fair value of contingent consideration is related to earnouts for the Joule, Frames, Giner and UHG acquisitions. The change in fair value of contingent consideration for the three months ended March 31, 2024 and 2023 was $(9.2) million and $8.8 million, respectively. The decrease was primarily due to changes in assumptions related to future earnout payments due primarily to renegotiated agreements during the first quarter of 2024.

Interest income. Interest income primarily consists of income generated by our investment holdings, restricted cash escrow accounts, and money market accounts. Interest income for the three months ended March 31, 2024 decreased $8.3 million compared to the three months ended March 31, 2023. The decrease during the three months ended March 31, 2024 compared to March 31, 2023 was primarily due to the maturities and sale of the Company’s available-for-sale portfolio of higher-yielding U.S. treasury securities during 2023.

Interest expense. Interest expense consists of interest expense related to our long-term debt, convertible senior notes, obligations under finance leases and our finance obligations. Interest expense for the three months ended March 31, 2024 was commensurate with interest expense for the three months ended March 31, 2023.

Other expense, net. Other expense, net primarily consists of gains and losses related to energy contracts and foreign currency. Other expense, net for the three months ended March 31, 2024 increased $2.2 million compared to the three months ended March 31, 2023. The increase was primarily due to foreign currency losses.

Change in fair value of equity securities. Change in fair value of equity securities consists of the changes in fair value for equity securities from the purchase date to the end of the period. The change in fair value of equity securities was $0 for the three months ended March 31, 2024 compared to a gain of $5.1 million for the three months ended March 31, 2023. The decrease in the change in fair value of equity securities is due to the Company selling its remaining equity securities during the fourth quarter of 2023.

Loss on equity method investments. Loss on equity method investments consists of our interest in HyVia, which is our 50/50 joint venture with Renault, AccionaPlug, which is our 50/50 joint venture with Acciona, SK Plug Hyverse, which is our 49/51 joint venture with SK E&S, and Clean H2 Infra Fund. For the three months ended March 31, 2024, the Company recorded a loss of $13.1 million on equity method investments compared to a loss of $5.3 million for the three months ended March 31, 2023. These losses are driven from the start-up activities for commercial and production operations of the aforementioned investments.

Loss on extinguishment of debt. Loss on extinguishment of debt arises from the difference between the net carrying amount of the Company’s debt and the fair value of the assets transferred to extinguish the debt. For the three months ended March 31, 2024, the Company recorded a loss of $14.0 million on extinguishment of debt. These losses are driven from the exchange of $138.8 million in aggregate principal amount of the Company’s 3.50% Convertible Senior Notes for $140.4 million in aggregate principal amount of the Company’s new 7.00% Convertible Senior Notes during the first quarter of 2024.

42

Income Taxes

The Company recorded $0.2 million of income tax expense and $1.3 million of income tax benefit for the three months ended March 31, 2024 and 2023, respectively. The income tax expense for the three months ended March 31, 2024 was due to an incremental change to the valuation allowance recorded in foreign jurisdictions. The Company has not changed its overall conclusion with respect to the need for a valuation allowance against its domestic net deferred tax assets, which remain fully reserved, and its valuation allowances recorded in foreign jurisdictions.

The domestic net deferred tax asset generated from the Company’s net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized. The Company recognizes accrued interest and penalties related to unrecognized tax benefits, if any, as a component of income tax expense.

The Organization for Economic Co-operation and Development Inclusive Framework on Base Erosion and Profit Shifting has proposed a global minimum corporate tax rate of 15% on multi-national corporations, commonly referred to as the Pillar Two rules that has been agreed upon in principle by over 140 countries. Numerous foreign countries have enacted legislation to implement the Pillar Two rules, effective beginning January 1, 2024, or are expected to enact similar legislation. As of March 31, 2024, the Company did not meet the consolidated revenue threshold and is not subject to the GloBE Rules under Pillar Two. The Company will continue to monitor the implementation of rules in the jurisdictions in which it operates.

Liquidity and Capital Resources

As of March 31, 2024 and December 31, 2023, the Company had $172.9 million and $135.0 million, respectively, of cash and cash equivalents and $1.0 billion of restricted cash.

The Company has continued to experience negative cash flows from operations and net losses. The Company incurred net losses of $295.8 million and $206.6 million for the three months ended March 31, 2024 and 2023, respectively, and had an accumulated deficit of $4.8 billion as of March 31, 2024.

The net cash used in operating activities for the three months ended March 31, 2024 and 2023 was $167.7 million and $276.9 million, respectively. This decrease in net cash used in operating activities was primarily due to a larger decrease in accounts receivable and a smaller increase in inventory, partially offset by an increase in net loss and an increase in inventory valuation adjustments. The Company’s working capital was $855.1 million as of March 31, 2024, which included unrestricted cash and cash equivalents of $172.9 million. The net cash (used in)/provided by investing activities for the three months ended March 31, 2024 and 2023 was ($120.6) million and $95.8 million, respectively. The change from cash inflow to cash outflow from investing activities is primarily due to a decrease in proceeds from maturities of available-for-sale securities during the three months ended March 31, 2024 as the Company no longer holds available-for-sale securities. The net cash provided by financing activities for the three months ended March 31, 2024 and 2023 was $283.1 million and $7.2 million, respectively. The increase in cash provided by financing activities was primarily driven by proceeds from the At Market Issuance Sales Agreement during the three months ended March 31, 2024, partially offset by a decrease in proceeds from finance obligations.

On January 17, 2024, the Company entered into the At Market Issuance Sales Agreement (the “Original ATM Agreement”) with B. Riley Securities, Inc. (“B. Riley”), pursuant to which the Company may, from time to time, offer and sell through or to B. Riley, as sales agent or principal, shares of the Company’s common stock, having an aggregate offering price of up to $1.0 billion. As of February 23, 2024, the Company had $697.9 million remaining authorized for issuance under the Original ATM Agreement. On February 23, 2024, the Company and B. Riley entered into Amendment No. 1 to the Original ATM Agreement (the “Amendment” and, together with the Original ATM Agreement, the “ATM Agreement”) to increase the aggregate offering price of shares of the Company’s common stock available for future issuance under the Original ATM Agreement to $1.0 billion. Under the ATM Agreement, for a period of 18 months, the Company has the right at its sole discretion to direct B. Riley to act on a principal basis and purchase directly from the Company up to $11.0 million of shares of its common stock on any trading day (the “Maximum Commitment Advance

43

Purchase Amount”) and up to $55.0 million of shares in any calendar week (the “Maximum Commitment Advance Purchase Amount Cap”). On and after June 1, 2024, so long as the Company’s market capitalization is no less than $1.0 billion, the Maximum Commitment Advance Purchase Amount will remain $11.0 million and the Maximum Commitment Advance Purchase Amount Cap will remain $55.0 million. If the Company’s market capitalization is less than $1.0 billion on and after June 1, 2024, the Maximum Commitment Advance Purchase Amount will be decreased to $10.0 million and the Maximum Commitment Advance Purchase Amount Cap will be decreased to $30.0 million. Through the date of filing of the Quarterly Report on Form 10-Q, the Company sold 135,354,467 shares of common stock at a weighted-average sales price of $3.38 per share for gross proceeds of $457.1 million with related issuance costs of $6.5 million. The Company believes that its working capital and cash position, together with its right to direct B. Riley to purchase shares directly from the Company under the ATM Agreement, will be sufficient to fund its on-going operations for a period of at least 12 months subsequent to the issuance of the accompanying condensed consolidated financial statements.

The Company’s significant obligations consisted of the following as of March 31, 2024:

(i) Operating and finance leases totaling $343.5 million and $43.3 million, respectively, of which $65.3 million and $9.6 million, respectively, are due within the next 12 months. These leases are primarily related to sale/leaseback agreements entered into with various financial institutions to facilitate the Company’s commercial transactions with key customers. See Note 16, “Operating and Finance Lease Liabilities”, for more details.

(ii) Finance obligations totaling $349.8 million, of which approximately $85.2 million is due within the next 12 months. Finance obligations consist primarily of debt associated with the sale of future revenues and failed sale/leaseback transactions. See Note 17, “Finance Obligations”, for more details.

(iii) Convertible senior notes totaling $209.8 million, none of which is due within the next twelve months. See Note 9, “Convertible Senior Notes”, for more details.

(iv) Capital commitments totaling $98.1 million related to the Company’s equity method investments, of which all $98.1 million is due within the next 12 months. See Note 15, “Investments”, for more details.

(v) Future payments under non-cancelable unconditional purchase obligations with a remaining term in excess of one year totaling $56.4 million, of which $39.7 million is due within the next 12 months. See Note 18, “Commitments and Contingencies”, for more details.

(vi) Contingent consideration with an estimated fair value of approximately $106.3 million, of which $69.2 million is due within the next 12 months. See Note 14, “Fair Value Measurements”, for more details.

Public and Private Offerings of Equity and Debt

At Market Issuance Sales Agreement

As described above, on January 17, 2024, the Company entered into an At Market Issuance Sales Agreement with B. Riley, pursuant to which the Company may, from time to time, offer and sell through or to B. Riley, as sales agent or principal, shares of the Company’s common stock, having an aggregate offering price of up to $1.0 billion. As of February 23, 2024, the Company had $697.9 million remaining authorized for issuance under the ATM Agreement. On February 23, 2024, the Company amended the ATM Agreement to increase the amount of shares of the Company’s common stock available for sale under the ATM Agreement to $1.0 billion. During the three months ended March 31, 2024, the Company sold 79,553,175 shares of common stock at a weighted-average sales price of $3.89 per share for gross proceeds of $309.3 million with related issuance costs of $3.9 million.

44

Secured Debt

In June 2020, the Company acquired debt as part of its acquisition of United Hydrogen Group Inc. During the three months ended March 31, 2024, the Company repaid $0.3 million of principal related to this outstanding debt. The outstanding carrying value of the debt was $3.8 million as of March 31, 2024. The remaining outstanding principal on the debt was $5.2 million and the unamortized debt discount was $1.4 million, bearing varying interest rates ranging from 7.3% to 7.6%. The debt is scheduled to mature in 2026. As of March 31, 2024, the principal balance is due at each of the following dates as follows (in thousands):

December 31, 2024		3,057
December 31, 2025		1,200
December 31, 2026		900
Total outstanding principal	$	5,157

7.00% Convertible Senior Notes

On March 20, 2024, the Company entered into separate, privately negotiated exchange agreements with certain holders of the Company’s outstanding 3.75% Convertible Senior Notes pursuant to which the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes, and accrued and unpaid interest of $1.6 million on such notes to, but excluding, March 20, 2024, for $140.4 million in aggregate principal amount of the Company’s new 7.00% Convertible Senior Notes due 2026, in each case, pursuant to the exemption from registration provided by Section 4(a)(2) under the Securities Act of 1933, as amended (the “Securities Act”). Following the exchange, approximately $58.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes remained outstanding with terms unchanged.

This transaction was accounted for as an extinguishment of debt. As a result, the Company recorded a loss on extinguishment of debt of $14.0 million in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024. Loss on extinguishment of debt arises from the difference between the net carrying amount of the Company’s debt and the fair value of the assets transferred to extinguish the debt.

The 7.00% Convertible Senior Notes are the Company’s senior, unsecured obligations and are governed by the terms of an Indenture (the “Indenture”), dated as of March 20, 2024, entered into between the Company and Wilmington Trust, National Association, as trustee. The 7.00% Convertible Senior Notes bear cash interest at the rate of 7.00% per annum, payable semi-annually in arrears on June 1 and December 1 of each year, beginning on June 1, 2024, to holders of record at the close of business on the preceding May 15 and November 15, respectively. The 7.00% Convertible Senior Notes mature on June 1, 2026, unless earlier converted or redeemed or repurchased by the Company.

The conversion rate for the 7.00% Convertible Senior Notes is initially 235.4049 shares of the Company’s common stock per $1,000 principal amount of 7.00% Convertible Senior Notes, which is equivalent to an initial conversion price of approximately $4.25 per share of common stock, which represents a premium of approximately 20% over the last reported sale price of Plug’s common stock on the Nasdaq Capital Market on March 12, 2024. The conversion rate and conversion price are subject to customary adjustments upon the occurrence of certain events. Prior to the close of business on the business day immediately preceding December 1, 2025, the 7.00% Convertible Senior Notes will be convertible at the option of the holders of the 7.00% Convertible Senior Notes only upon the satisfaction of specified conditions and during certain periods. On or after December 1, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, the 7.00% Convertible Senior Notes will be convertible at the option of the holders of the 7.00% Convertible Senior Notes at any time regardless of these conditions. Conversions of the 7.00% Convertible Senior Notes will be settled in cash, shares of the Company’s common stock, or a combination thereof, at the Company’s election.

Subject to certain exceptions and subject to certain conditions, holders of the 7.00% Convertible Senior Notes may require the Company to repurchase their 7.00% Convertible Senior Notes upon the occurrence of a “Fundamental Change” (as defined in the Indenture) prior to maturity for cash at a repurchase price equal to 100% of the principal amount

45

of the 7.00% Convertible Senior Notes to be repurchased plus accrued and unpaid interest, if any, to, but excluding, the repurchase date.

The 7.00% Convertible Senior Notes will be redeemable, in whole or in part, at the Company’s option at any time on or after June 5, 2025, at a cash redemption price equal to the principal amount of the 7.00% Convertible Senior Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, but only if the last reported sale price per share of the Company’s common stock exceeds 130% of the then-applicable conversion price then in effect for at least 20 trading days (whether or not consecutive), including at least one of the three trading days immediately preceding the date the Company sends the related redemption notice, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company sends such redemption notice.

In certain circumstances, conversions of 7.00% Convertible Senior Notes in connection with “Make-Whole Fundamental Changes” (as defined in the Indenture) or conversions of 7.00% Convertible Senior Notes called for redemption may result in an increase to the conversion rate, provided that the conversion rate will not exceed 282.4859 shares of the Company’s common stock per $1,000 principal amount of 7.00% Convertible Senior Notes, subject to adjustment. In such circumstance, a maximum of 39,659,890 shares of common stock, subject to adjustment, may be issued upon conversion of the 7.00% Convertible Senior Notes. There were no conversions of the 7.00% Convertible Senior Notes during the three months ended March 31, 2024.

The 7.00% Convertible Senior Notes consisted of the following (in thousands):

	March 31,
	2024
Principal amounts:
Principal	$	140,396
Unamortized debt premium, net of offering costs (1)		11,440
Net carrying amount	$	151,836

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

The following table summarizes the total interest expense and effective interest rate related to the 7.00% Convertible Senior Notes for the three months ended March 31, 2024 (in thousands, except for the effective interest rate):

	March 31,
	2024
Interest expense	$	296
Amortization of premium		(159)
Total	$	137
Effective interest rate		3.0%

The estimated fair value of the 7.00% Convertible Senior Notes at March 31, 2024 was approximately $153.2 million. The fair value estimation was primarily based on a quoted price in an active market.

3.75% Convertible Senior Notes

On May 18, 2020, the Company issued $200.0 million in aggregate principal amount of 3.75% Convertible Senior Notes due June 1, 2025 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act. On May 29, 2020, the Company issued an additional $12.5 million in aggregate principal amount of 3.75% Convertible Senior Notes. On March 12, 2024, the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes for $140.4 million in aggregate principal amount of the Company’s new 7.00% Convertible Senior Notes due 2026. Following the exchange, approximately $58.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes remained outstanding with terms unchanged. There were no conversions of the 3.75% Convertible Senior Notes during the three months ended March 31, 2024 and 2023.

46

The 3.75% Convertible Senior Notes consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Principal amounts:
Principal	$	58,462	$	197,278
Unamortized debt issuance costs (1)		(496)		(2,014)
Net carrying amount	$	57,966	$	195,264

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

The following table summarizes the total interest expense and effective interest rate related to the 3.75% Convertible Senior Notes for the three months ended March 31, 2024 and 2023 (in thousands, except for the effective interest rate):

	March 31,			March 31,
	2024			2023
Interest expense	$	1,690	$	1,849
Amortization of debt issuance costs		316		331
Total	$	2,006	$	2,180
Effective interest rate		4.5%		4.5%

The estimated fair value of the 3.75% Convertible Senior Notes at March 31, 2024 was approximately $60.4 million. The fair value estimation was primarily based on a quoted price in an active market.

Capped Call

In conjunction with the pricing of the 3.75% Convertible Senior Notes, the Company entered into privately negotiated capped call transactions (the “3.75% Notes Capped Call”) with certain counterparties at a price of $16.2 million. The 3.75% Notes Capped Call covers, subject to anti-dilution adjustments, the aggregate number of shares of the Company’s common stock that underlie the initial 3.75% Convertible Senior Notes and is generally expected to reduce potential dilution to the Company’s common stock upon any conversion of the 3.75% Convertible Senior Notes and/or offset any cash payments the Company is required to make in excess of the principal amount of the converted notes, as the case may be, with such reduction and/or offset subject to a cap based on the cap price. The cap price of the 3.75% Notes Capped Call is initially $6.7560 per share, which represents a premium of approximately 60% over the last then-reported sale price of the Company’s common stock of $4.11 per share on the date of the transaction and is subject to certain adjustments under the terms of the 3.75% Notes Capped Call. The 3.75% Notes Capped Call becomes exercisable if the conversion option is exercised.

The net cost incurred in connection with the 3.75% Notes Capped Call was recorded as a reduction to additional paid-in capital in the unaudited interim condensed consolidated balance sheets. The book value of the 3.75% Notes Capped Call is not remeasured.

5.5% Convertible Senior Notes and Common Stock Forward

In March 2018, the Company issued $100.0 million in aggregate principal amount of the 5.5% Convertible Senior Notes due on March 15, 2023, in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act, which have been fully repaid. In connection with the issuance of the 5.5% Convertible Senior Notes, the Company entered into a forward stock purchase transaction (the “Common Stock Forward”), pursuant to which the Company agreed to purchase 14,397,906 shares of its common stock for settlement on or about March 15, 2023. On May 18, 2020, the Company amended and extended the maturity of the Common Stock Forward to June 1, 2025. The number of shares of common stock that the Company will ultimately repurchase under the Common Stock Forward is subject to

47

customary anti-dilution adjustments. The Common Stock Forward is subject to early settlement or settlement with alternative consideration in the event of certain corporate transactions.

The net cost incurred in connection with the Common Stock Forward of $27.5 million was recorded as an increase in treasury stock in the unaudited interim condensed consolidated balance sheets. The related shares were accounted for as a repurchase of common stock. The book value of the Common Stock Forward is not remeasured.

There were no shares of common stock that settled in connection with the Common Stock Forward during the three months ended March 30, 2024 and 2023.

Amazon Transaction Agreement in 2022

On August 24, 2022, the Company and Amazon entered into a Transaction Agreement (the “2022 Amazon Transaction Agreement”), under which the Company concurrently issued to Amazon.com NV Investment Holdings LLC, a wholly owned subsidiary of Amazon, a warrant (the “2022 Amazon Warrant”) to acquire up to 16,000,000 shares (the “2022 Amazon Warrant Shares”) of the Company’s common stock, subject to certain vesting events described below. The Company and Amazon entered into the 2022 Amazon Transaction Agreement in connection with a concurrent commercial arrangement under which Amazon agreed to purchase hydrogen fuel from the Company through August 24, 2029.

1,000,000 of the 2022 Amazon Warrant Shares vested immediately upon issuance of the 2022 Amazon Warrant. 15,000,000 of the 2022 Amazon Warrant Shares will vest in multiple tranches over the 7-year term of the 2022 Amazon Warrant based on payments made to the Company directly by Amazon or its affiliates, or indirectly through third parties, with 15,000,000 of the 2022 Amazon Warrant Shares fully vesting if Amazon-related payments of $2.1 billion are made in the aggregate. The exercise price for the first 9,000,000 2022 Amazon Warrant Shares is $22.9841 per share and the fair value on the grant date was $20.36. The exercise price for the remaining 7,000,000 2022 Amazon Warrant Shares will be an amount per share equal to 90% of the 30-day volume weighted average share price of the Company’s common stock as of the final vesting event that results in full vesting of the first 9,000,000 2022 Amazon Warrant Shares. The 2022 Amazon Warrant is exercisable through August 24, 2029.

Upon the consummation of certain change of control transactions (as defined in the 2022 Amazon Warrant) prior to the vesting of at least 60% of the aggregate 2022 Amazon Warrant Shares, the 2022 Amazon Warrant will automatically vest and become exercisable with respect to an additional number of 2022 Amazon Warrant Shares such that 60% of the aggregate 2022 Amazon Warrant Shares shall have vested. If a change of control transaction is consummated after the vesting of at least 60% of the aggregate 2022 Amazon Warrant Shares, then no acceleration of vesting will occur with respect to any of the unvested 2022 Amazon Warrant Shares as a result of the transaction. The exercise price and the 2022 Amazon Warrant Shares issuable upon exercise of the 2022 Amazon Warrant are subject to customary antidilution adjustments.

On August 24, 2022, 1,000,000 of the 2022 Amazon Warrant Shares associated with tranche 1 vested. The warrant fair value associated with the vested shares of tranche 1 of $20.4 million was capitalized to contract assets based on the grant date fair value and is subsequently amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement. As of March 31, 2024 the balance of the contract asset related to tranche 1 was $19.3 million which is recorded in contract assets in the Company’s unaudited interim condensed consolidated balance sheet. During the second quarter of 2023, all 1,000,000 of the 2022 Amazon Warrant Shares associated with tranche 2 vested. The warrant fair value associated with the vested shares of tranche 2 was $20.4 million and was determined on the grant date of August 24, 2022. As of March 31, 2024 the balance of the contract asset related to tranche 2 was $19.3 million. Tranche 3 will vest over the next $1.0 billion of collections from Amazon and its affiliates. The grant date fair value of tranche 3 will also be amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement. As of March 31, 2024 the balance of the contract asset related to tranche 3 was $2.0 million. Because the exercise price has yet to be determined, the fair value of tranche 4 will be remeasured at each reporting period end and amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement.

48

As of March 31, 2024 and December 31, 2023, 2,000,000 of the 2022 Amazon Warrant Shares had vested and the 2022 Amazon Warrant had not been exercised. The total amount of provision for common stock warrants recorded as a reduction of revenue for the 2022 Amazon Warrant during the three months ended March 31, 2024 and 2023 was $0.7 million and $1.1 million, respectively.

The assumptions used to calculate the valuations of the 2022 Amazon Warrant as of August 24, 2022 and March 31, 2024 are as follows:

	Tranches 1-3	Tranche 4
	August 24, 2022	March 31, 2024
Risk-free interest rate	3.15%	4.12%
Volatility	75.00%	90.00%
Expected average term (years)	7.00	4.00
Exercise price	$22.98	$3.10
Stock price	$20.36	$3.44

Amazon Transaction Agreement in 2017

On April 4, 2017, the Company and Amazon entered into a Transaction Agreement (the “2017 Amazon Transaction Agreement”), pursuant to which the Company agreed to issue to Amazon.com NV Investment Holdings LLC, a warrant (the “2017 Amazon Warrant”) to acquire up to 55,286,696 shares (the “2017 Amazon Warrant Shares”), subject to certain vesting events. The Company and Amazon entered into the 2017 Amazon Transaction Agreement in connection with existing commercial agreements between the Company and Amazon with respect to the deployment of the Company’s GenKey fuel cell technology at Amazon distribution centers. The vesting of the 2017 Amazon Warrant Shares was conditioned upon payments made by Amazon or its affiliates (directly or indirectly through third parties) pursuant to existing commercial agreements. On December 31, 2020, the Company waived the remaining vesting conditions under the 2017 Amazon Warrant, which resulted in the immediate vesting of all of the third tranche of the 2017 Amazon Warrant Shares.

As of March 31, 2024 and 2023, all 55,286,696 of the 2017 Amazon Warrant Shares had vested and the 2017 Amazon Warrant was exercised with respect to 34,917,912 shares of the Company’s common stock. The total amount of provision for common stock warrants recorded as a reduction of revenue for the 2017 Amazon Warrant during the three months ended March 31, 2024 and 2023 was $0.1 million and $0.2 million, respectively.

Walmart Transaction Agreement

On July 20, 2017, the Company and Walmart entered into a Transaction Agreement (the “Walmart Transaction Agreement”), pursuant to which the Company agreed to issue to Walmart a warrant (the “Walmart Warrant”) to acquire up to 55,286,696 shares of the Company’s common stock, subject to certain vesting events (the “Walmart Warrant Shares”). The Company and Walmart entered into the Walmart Transaction Agreement in connection with existing commercial agreements between the Company and Walmart with respect to the deployment of the Company’s GenKey fuel cell technology across various Walmart distribution centers. The existing commercial agreements contemplate, but do not guarantee, future purchase orders for the Company’s fuel cell technology. The vesting of the warrant shares was conditioned upon payments made by Walmart or its affiliates (directly or indirectly through third parties) pursuant to transactions entered into after January 1, 2017 under existing commercial agreements.

The exercise price for the first and second tranches of Walmart Warrant Shares was $2.1231 per share. After Walmart has made payments to the Company totaling $200.0 million, the third tranche of 20,368,784 Walmart Warrant Shares will vest in eight installments of 2,546,098 Walmart Warrant Shares each time Walmart or its affiliates, directly or indirectly through third parties, make an aggregate of $50.0 million in payments for goods and services to the Company, up to payments totaling $400.0 million in the aggregate. The exercise price of the third tranche of the Walmart Warrant Shares is $6.28 per share, which was determined pursuant to the terms of the Walmart Warrant as an amount equal to 90% of the 30-day volume weighted average share price of the Company’s common stock as of October 30, 2023, the final

49

vesting date of the second tranche of the Walmart Warrant Shares. The Walmart Warrant is exercisable through July 20, 2027. The Walmart Warrant provides for net share settlement that, if elected by the holder, will reduce the number of shares issued upon exercise to reflect net settlement of the exercise price. The Walmart Warrant provides for certain adjustments that may be made to the exercise price and the number of shares of common stock issuable upon exercise due to customary anti-dilution provisions based on future events. The Walmart Warrant is classified as an equity instrument.

As of March 31, 2024 and December 31, 2023, 37,464,010 and 34,917,912 of the Walmart Warrant Shares had vested, respectively, and the Walmart Warrant was exercised with respect to 13,094,217 shares of the Company’s common stock. As of March 31, 2024, the balance of the contract asset related to the Walmart Warrant was $6.9 million. The total amount of provision for common stock warrants recorded as a reduction of revenue for the Walmart Warrant during the three months ended March 31, 2024 and 2023 was $3.7 million and $12.9 million, respectively.

The assumptions used to calculate the valuations of the Walmart Warrant as of January 1, 2019 and October 30, 2023 are as follows:

	Tranches 1-2	Tranche 3
	January 1, 2019	October 30, 2023
Risk-free interest rate	2.63%	4.73%
Volatility	95.00%	75.00%
Expected average term (years)	8.55	3.72
Exercise price	$2.12	$6.28
Stock price	$1.24	$5.70

Operating and Finance Lease Liabilities

As of March 31, 2024, the Company had operating leases, as lessee, primarily associated with sale/leaseback transactions that are partially secured by restricted cash and security deposits (see also Note 18, “Commitments and Contingencies”) as summarized below. These leases expire over the next one to seven years. Minimum rent payments under operating leases are recognized on a straight-line basis over the term of the lease.

Leases contain termination clauses with associated penalties, the amount of which cause the likelihood of cancellation to be remote. At the end of the lease term, the leased assets may be returned to the lessor by the Company, the Company may negotiate with the lessor to purchase the assets at fair market value, or the Company may negotiate with the lessor to renew the lease at market rental rates. No residual value guarantees are contained in the leases. No financial covenants are contained within the lease; however, the lease contains customary operational covenants such as the requirement that the Company properly maintain the leased assets and carry appropriate insurance. The leases include credit support in the form of either cash, collateral or letters of credit. See Note 18, “Commitments and Contingencies”, for a description of cash held as security associated with the leases.

The Company has finance leases associated with its property and equipment in Latham, New York and at fueling customer locations.

Finance Obligation

The Company has sold future services to be performed associated with certain sale/leaseback transactions and recorded the balance as a finance obligation. The outstanding balance of this obligation at March 31, 2024 was $333.0 million, $75.7 million and $257.3 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The outstanding balance of this obligation at December 31, 2023 was $350.8 million, $74.0 million and $276.8 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The amount is amortized using the effective interest method. Interest expense recorded related to finance obligations for the three months ended March 31, 2024 and 2023 was $10.0 million and $9.2 million, respectively.

50

In prior periods, the Company entered into sale/leaseback transactions that were accounted for as financing transactions and reported as part of finance obligations. The outstanding balance of finance obligations related to sale/leaseback transactions at March 31, 2024 was $16.8 million, $9.5 million and $7.3 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The outstanding balance of this obligation at December 31, 2023 was $17.6 million, $10.0 million and $7.6 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet.

The fair value of the Company’s total finance obligations approximated their carrying value as of March 31, 2024 and December 31, 2023.

Restricted Cash

In connection with certain of the above noted sale/leaseback agreements, cash of $552.8 million and $573.5 million was required to be restricted as security as of March 31, 2024 and December 31, 2023, respectively, which restricted cash will be released over the lease term. As of March 31, 2024 and December 31, 2023, the Company also had certain letters of credit backed by security deposits totaling $351.8 million and $370.7 million, respectively, of which $321.0 million and $340.0 million are security for the above noted sale/leaseback agreements, respectively, and $30.8 million and $30.7 million are customs related letters of credit, respectively.

As of March 31, 2024 and December 31, 2023, the Company had $76.9 million and $76.8 million held in escrow related to the construction of certain hydrogen production plants, respectively.

The Company also had $1.2 million and $0.2 million of consideration held by our paying agent in connection with each of the Joule and CIS acquisitions, respectively, reported as restricted cash as of March 31, 2024, with a corresponding accrued liability on the Company’s unaudited interim condensed consolidated balance sheet. Additionally, the Company had $12.3 million and $11.7 million in restricted cash as collateral resulting from the Frames acquisition as of March 31, 2024 and December 31, 2023, respectively.

Guarantee

On May 30, 2023, our joint venture, HyVia, entered into a government grant agreement with Bpifrance. As part of the agreement, our wholly-owned subsidiary, Plug Power France, was required to issue a guarantee to Bpifrance in the amount of €20 million through the end of January 2027. Plug Power France is liable to the extent of the guarantee for sums due to Bpifrance from HyVia under the agreement based on the difference between the total amount paid by Bpifrance and the final amount certified by HyVia and Bpifrance. As part of the agreement, there are certain milestones that HyVia is required to meet, and the nonperformance of these milestones or termination of this agreement could result in this guarantee being called upon. As of March 31, 2024, no payments related to this guarantee have been made by the Company and Plug Power France did not record a liability for this guarantee as the likelihood of the guarantee being called upon is remote.

Unconditional Purchase Obligations

The Company has entered into certain off–balance sheet commitments that require the future purchase of goods or services (“unconditional purchase obligations”). The Company’s unconditional purchase obligations primarily consist of supplier arrangements, take or pay contracts and service agreements. For certain vendors, the Company’s unconditional obligation to purchase a minimum quantity of raw materials at an agreed upon price is fixed and determinable; while certain other raw material costs will vary due to product forecasting and future economic conditions.

51

Future payments under non-cancelable unconditional purchase obligations with a remaining term in excess of one year as of March 31, 2024, were as follows (in thousands):

Remainder of 2024	$	37,742
2025		8,023
2026		8,023
2027		2,638
2028		—
2029 and thereafter		—
Total		56,426

Restructuring

In February 2024, in a strategic move to enhance our financial performance and ensure long-term value creation in a competitive market, we approved a comprehensive initiative that encompasses a broad range of measures, including operational consolidation, strategic workforce adjustments, and various other cost-saving actions (the “Restructuring Plan”). These measures are aimed at increasing efficiency, improving scalability, and maintaining our leadership position in the renewable energy industry. We began executing the Restructuring Plan in February 2024 and expect the Restructuring Plan to be completed in the second half of 2024, subject to local law and consultation requirements.

The determination of when we accrue for involuntary termination benefits under restructuring plans depends on whether the termination benefits are provided under an ongoing benefit arrangement or under a one-time benefit arrangement. We account for involuntary termination benefits that are provided pursuant to one-time benefit arrangements in accordance with ASC 420, Exit or Disposal Cost Obligations (“ASC 420”) whereas involuntary termination benefits that are part of an ongoing written or substantive plan are accounted for in accordance with ASC 712, Nonretirement Postemployment Benefits. We accrue a liability for termination benefits under ASC 420 in the period in which the plan is communicated to the employees and the plan is not expected to change significantly. For ongoing benefit arrangements, inclusive of statutory requirements, we accrue a liability for termination benefits under ASC 712 when the existing situation or set of circumstances indicates that an obligation has been incurred, it is probable the benefits will be paid, and the amount can be reasonably estimated. The restructuring charges that have been incurred but not yet paid are recorded in accrued expenses and other current liabilities in our unaudited interim condensed consolidated balance sheets, as they are expected to be paid within the next twelve months.

During the three months ended March 31, 2024, we incurred $6.0 million in restructuring costs recorded as severance expenses of $5.2 million, and other restructuring costs of $0.8 million in the restructuring financial statement line item in the unaudited interim condensed consolidated statement of operations. We expect to incur another $1.1 million in restructuring costs in subsequent quarters, which are primarily related to severance expenses, and are expected to be incurred during the third quarter of 2024. The actual timing and amount of costs associated with these restructuring actions may differ from our current expectations and estimates and such differences may be material.

Severance expense recorded during the three months ended March 31, 2024 in accordance with ASC 420 was a result of the separation of full-time employees associated with the Restructuring Plan. As of March 31, 2024, $0.8 million of accrued severance-related costs were included in accrued expenses in our unaudited interim condensed consolidated balance sheets and are expected to be paid during the third quarter of 2024. Other costs are represented by (1) $0.2 million of legal and professional services costs, and (2) $0.6 million of other one-time employee termination benefits. As of March 31, 2024, $0.1 million of accrued other costs were included in accrued expenses in our unaudited interim condensed consolidated balance sheets and are expected to be paid during the third quarter of 2024.

Extended Maintenance Contracts

On a quarterly basis, we evaluate any potential losses related to our extended maintenance contracts for sales of equipment, related infrastructure and other that have been sold. The following table shows the roll forward of balances in

52

the accrual for loss contracts, including changes due to the provision for loss accrual, releases to service cost of sales, provision for warrants, and foreign currency translation adjustment (in thousands):

	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Beginning balance	$	137,853	$	81,066
Provision for loss accrual		15,111		85,375
Releases to service cost of sales		(11,936)		(29,713)
Increase to loss accrual related to customer warrants		634		971
Foreign currency translation adjustment		(93)		154
Ending balance	$	141,569	$	137,853

The Company increased its loss accrual to $141.6 million for the three months ended March 31, 2024 primarily due to continued cost increases of GenDrive labor, parts and related overhead coupled with new GenDrive contracts entered into requiring provisions to be set up. As a result, the Company increased its estimated projected costs.

Critical Accounting Estimates

The consolidated financial statements of the Company have been prepared in conformity with U.S. generally accepted accounting principles, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, we evaluate our estimates and judgments, including but not limited to those related to revenue recognition, valuation of inventories, intangible assets, valuation of long-lived assets, accrual for service loss contracts, operating and finance leases, allowance for doubtful accounts receivable, unbilled revenue, common stock warrants, stock-based compensation, income taxes, and contingencies. We base our estimates and judgments on historical experience and on various other factors and assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about (1) the carrying values of assets and liabilities and (2) the amount of revenue and expenses realized that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

There have been no changes in our critical accounting estimates from those reported in our 2023 Form 10-K.

Recent Accounting Pronouncements

Recently Adopted Accounting Guidance

There have been no significant changes in our reported financial position or results of operations and cash flows resulting from the adoption of new accounting pronouncements.

Recently Issued and Not Yet Adopted Accounting Pronouncements

All recently issued but not yet adopted accounting and reporting standards as of March 31, 2024 are either not applicable to the Company or are not expected to have a material impact on the Company.

53

Item 3 — Quantitative and Qualitative Disclosures about Market Risk

There has been no material change from the information provided in the Company’s 2023 Form 10-K under the section titled Item 7A, “Quantitative and Qualitative Disclosures About Market Risk”.

Item 4 — Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our reports that we file or submit under the Exchange Act, are recorded, processed, summarized and reported within the time periods specified in SEC rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer (our principal executive officer) and Chief Financial Officer (our principal financial officer) as appropriate, to allow for timely decisions regarding required disclosure. Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act), as of March 31, 2024.

Remediation Efforts to Address the Material Weaknesses

Our remediation efforts, which we previously identified in Part II, Item 9A, “Controls and Procedures”, of our 2023 Form 10-K, to address the identified material weaknesses are ongoing as we continue to implement and document necessary policies, procedures, and internal controls. While we believe the steps taken to date will improve the effectiveness of our internal control over financial reporting, we have not completed all remediation efforts and cannot conclude that the material weaknesses have been remediated as of March 31, 2024. The material weaknesses cannot be considered remediated until applicable controls have operated for a sufficient period of time and management has concluded, through testing, that these controls are operating effectively.

Changes in Internal Control over Financial Reporting

There were no changes during the quarter ended March 31, 2024 in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

54

Part II. OTHER INFORMATION

Item 1 – Legal Proceedings

See Note 18, “Commitments and Contingencies”, within Item 1 of this Quarterly Report on Form 10-Q for a discussion regarding material legal proceedings.

Except as otherwise noted, there have been no material developments in legal proceedings. For previously reported information about legal proceedings, refer to Part I, Item 3, “Legal Proceedings”, of the Company’s 2023 Form 10-K.

Item 1A – Risk Factors

In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the risk factors that could materially affect the Company’s business, financial condition or future results discussed in the Company’s 2023 Form 10-K in Part I, Item 1A. “Risk Factors”. The risks described in the 2023 Form 10-K are not the only risks that could affect the Company. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial may also materially adversely affect our business, financial condition and/or operating results in the future. As a supplement to the risk factors identified in the 2023 Form 10-K, below we have set forth an updated risk factor. Other than as provided below, there have been no material changes to the risk factors identified in the 2023 Form 10-K.

Our ability to achieve our business objectives and to continue to meet our obligations is dependent upon our ability to maintain a certain level of liquidity, which will depend in part on our ability to manage our cash flows, including successfully implementing our cost savings initiatives.

To operate more efficiently and control our expenditures, we announced the Restructuring Plan in February 2024 that encompassed a broad range of cost-saving measures, including operational consolidation, strategic workforce reductions and various other cost reduction initiatives. There can be no assurance that the anticipated cost savings, operating efficiencies or other benefits will be achieved, within the anticipated timeframes or at all, or that they will not be significantly and materially less than anticipated. Our ability to realize the anticipated cost savings is subject to many estimates and assumptions, including business, economic and competitive uncertainties and contingencies, such as our ability to maintain business relationships and successfully negotiate changes to existing agreements with respect to pricing increases, contract terms, and delivery times, among others. Many of these uncertainties and contingencies are beyond our control and if our estimates and assumptions prove to be incorrect, if we experience delays, or if other unforeseen events occur, it may impact our ability to realize the anticipated cost savings. In addition, our cost savings initiatives may subject us to litigation risks and expenses and may have other consequences, such as attrition beyond our planned reduction in workforce or a negative effect on employee morale, productivity or ability to attract highly skilled employees.

If the Restructuring Plan fails to achieve some or all of the expected benefits, it may negatively impact our current forecast of cash flows and we may be required to initiate further cost savings activities or negotiate further changes to existing agreements with vendors, suppliers and service providers. Further, the Restructuring Plan may result in unexpected expenses or liabilities and/or write-offs. Our lack of cash flows may also constrain our business and subject us to significant risks, including being unable to make the necessary investments in our business such as in our hydrogen plants, raw materials or other resources to effectively pursue our business objectives, delays in the construction of our hydrogen plants or the receipt of raw materials due to payment issues, and inability to fulfill purchase orders. Our inability to successfully execute our business objectives could have a material adverse effect on our business, financial condition and results of operations.

55

Item 2 - Unregistered Sales of Equity Securities and Use of Proceeds

(a) Not applicable.

(b) Not applicable.

(c) None.

Item 3 — Defaults Upon Senior Securities

None.

Item 4 — Mine Safety Disclosures

None.

Item 5 — Other Information

(c) Director and Officer Trading Arrangements

During the three months ended March 31, 2024, none of the Company’s directors or officers (as defined in Rule 16a-1(f) of the Exchange Act) adopted, terminated or modified a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K).

56

Item 6 — Exhibits

3.1	Amended and Restated Certificate of Incorporation of Plug Power Inc. (filed as Exhibit 3.1 to Plug Power Inc.’s Annual Report on Form 10-K filed on March 16, 2009 and incorporated by reference herein)
3.2	Certificate of Amendment to Amended and Restated Certificate of Incorporation of Plug Power Inc. (filed as Exhibit 3.3 to Plug Power Inc.’s Annual Report on Form 10-K filed on March 16, 2009 and incorporated by reference herein)
3.3	Second Certificate of Amendment of Amended and Restated Certificate of Incorporation of Plug Power Inc. (filed as Exhibit 3.1 to Plug Power Inc.’s Current Report on Form 8-K filed on May 19, 2011 and incorporated by reference herein)
3.4	Third Certificate of Amendment of Amended and Restated Certificate of Incorporation of Plug Power Inc. (filed as Exhibit 3.1 to Plug Power Inc.’s Current Report on Form 8-K filed on July 25, 2014 and incorporated by reference herein)
3.5	Certificate of Correction to Third Certificate of Amendment of Amended and Restated Certificate of Incorporation of Plug Power Inc. (filed as Exhibit 3.9 to Plug Power Inc.’s Annual Report on Form 10-K filed on March 10, 2017 and incorporated by reference herein)
3.6	Fourth Certificate of Amendment of Amended and Restated Certificate of Incorporation of Plug Power Inc. (filed as Exhibit 3.1 to Plug Power Inc.’s Current Report on Form 8-K filed on June 30, 2017 and incorporated by reference herein)
3.7	Fifth Certificate of Amendment of Amended and Restated Certificate of Incorporation of Plug Power Inc. (filed as Exhibit 3.7 to Plug Power Inc.’s Quarterly Report on Form 10-Q filed on August 5, 2021 and incorporated by reference herein)
3.8	Certificate of Designations, Preferences and Rights of a Series of Preferred Stock of Plug Power Inc. classifying and designating the Series A Junior Participating Cumulative Preferred Stock. (filed as Exhibit 3.1 to Plug Power Inc.’s Registration Statement on Form 8-A filed on June 24, 2009 and incorporated by reference herein)
3.9	Seventh Amended and Restated By-laws of Plug Power Inc. (filed as Exhibit 3.1 to Plug Power Inc.’s Current Report on Form 8-K filed on April 26, 2024 and incorporated by reference herein)
4.1	Indenture, dated as of March 20, 2024, between Plug Power Inc. and Wilmington Trust, National Association, as Trustee. (filed as Exhibit 4.1 to Plug Power Inc.’s Current Report on Form 8-K filed on March 26, 2024 and incorporated by reference herein)
4.2	Form of 7.00% Convertible Senior Notes due 2026 (included as part of Exhibit 4.1)
10.1	At Market Issuance Sales Agreement, dated January 17, 2024, by and between Plug Power Inc. and B. Riley Securities, Inc. (filed as Exhibit 1.1 to Plug Power Inc.’s Current Report on Form 8-K filed on January 17, 2024 and incorporated by reference herein)
10.2	Amendment No. 1 to At Market Issuance Sales Agreement, dated February 23, 2024, by and between Plug Power Inc. and B. Riley Securities, Inc. (filed as Exhibit 1.1 to Plug Power Inc.’s Current Report on Form 8-K filed on February 23, 2024 and incorporated by reference herein)
31.1*	Certification pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1**	Certification pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2**	Certification pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS*	Inline XBRL Instance Document
101.SCH*	Inline XBRL Taxonomy Extension Schema Document
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	Inline XBRL Taxonomy Extension Labels Linkbase Document
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104*	Cover Page Interactive Data File (embedded within the Inline XBRL document)

* Submitted electronically herewith.

** Pursuant to Item 601(b)(32)(ii) of Regulation S-K, this certification is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

57

Signatures

Pursuant to requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	PLUG POWER INC.
Date: May 9, 2024	By:	/s/ Andrew Marsh
		Andrew Marsh
		President, Chief Executive Officer and Director (Principal Executive Officer)
Date: May 9, 2024	By:	/s/ Paul B. Middleton
		Paul B. Middleton
		Chief Financial Officer (Principal Financial Officer)

58

EX-31.1

Exhibit 31.1

I, Andrew Marsh, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Plug Power Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 9, 2024

by:	/s/ Andrew Marsh
	Andrew Marsh
	Chief Executive Officer

EX-31.2

Exhibit 31.2

I, Paul B. Middleton, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Plug Power Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 9, 2024

by:	/s/ Paul B. Middleton
	Paul B. Middleton
	Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Plug Power Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2024 as filed with the Securities and Exchange Commission (the “SEC”) on the date hereof (the “Report”), I, Andrew Marsh, Chief Executive Officer of the Company, certify, solely pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

This certification is being furnished and not filed, and shall not be incorporated into any documents for any other purpose, under the Securities Exchange Act of 1934, as amended or the Securities Act of 1933, as amended. A signed original of this written statement required by § 906 has been provided to the Company and will be retained by the Company and furnished to the SEC or its staff upon request.

ay

/s/ Andrew Marsh

Andrew Marsh

Chief Executive Officer

May 9, 2024

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Plug Power Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2024 as filed with the Securities and Exchange Commission (the “SEC”) on the date hereof (the “Report”), I, Paul B. Middleton, Chief Financial Officer of the Company, certify, solely pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

This certification is being furnished and not filed, and shall not be incorporated into any documents for any other purpose, under the Securities Exchange Act of 1934, as amended or the Securities Act of 1933, as amended. A signed original of this written statement required by § 906 has been provided to the Company and will be retained by the Company and furnished to the SEC or its staff upon request.

Ay

/s/ Paul B. Middleton

Paul B. Middleton

Chief Financial Officer

May 9, 2024

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 07, 2024
Document and Entity Information:
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	1-34392
Entity Registrant Name	PLUG POWER INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-3672377
Entity Address, Address Line One	968 ALBANY SHAKER ROAD
Entity Address, City or Town	LATHAM
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	12110
City Area Code	518
Local Phone Number	782-7700
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	PLUG
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		742,559,081
Entity Central Index Key	0001093691
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 172,873	$ 135,033
Restricted cash	219,616	216,552
Accounts receivable, net of allowance of $7,351 at March 31, 2024 and $8,798 at December 31, 2023	148,822	243,811
Inventory, net	975,898	961,253
Contract assets	129,994	126,248
Prepaid expenses and other current assets	119,370	104,068
Total current assets	1,766,573	1,786,965
Restricted cash	775,595	817,559
Property, plant, and equipment, net	1,453,991	1,436,177
Right of use assets related to finance leases, net	56,131	57,281
Right of use assets related to operating leases, net	389,201	399,969
Equipment related to power purchase agreements and fuel delivered to customers, net	115,109	111,261
Contract assets	30,380	29,741
Intangible assets, net	183,325	188,886
Investments in non-consolidated entities and non-marketable equity securities	66,691	63,783
Other assets	10,310	11,116
Total assets	4,847,306	4,902,738
Current liabilities:
Accounts payable	285,546	257,828
Accrued expenses	154,814	200,544
Deferred revenue and other contract liabilities	179,902	204,139
Operating lease liabilities	65,250	63,691
Finance lease liabilities	9,602	9,441
Finance obligations	85,175	84,031
Current portion of long-term debt	2,786	2,716
Contingent consideration, loss accrual for service contracts, and other current liabilities	128,369	142,410
Total current liabilities	911,444	964,800
Deferred revenue and other contract liabilities	75,900	84,163
Operating lease liabilities	278,220	292,002
Finance lease liabilities	33,673	36,133
Finance obligations	264,610	284,363
Convertible senior notes, net	209,802	195,264
Long-term debt	1,013	1,209
Contingent consideration, loss accrual for service contracts, and other liabilities	143,522	146,679
Total liabilities	1,918,184	2,004,613
Stockholders' equity:
Common stock, $.01 par value per share; 1,500,000,000 shares authorized; Issued (including shares in treasury): 705,604,549 at March 31, 2024 and 625,305,025 at December 31, 2023	7,057	6,254
Additional paid-in capital	7,823,209	7,494,685
Accumulated other comprehensive loss	(9,078)	(6,802)
Accumulated deficit	(4,785,520)	(4,489,744)
Less common stock in treasury: 19,242,215 at March 31, 2024 and 19,169,366 at December 31, 2023	(106,546)	(106,268)
Total stockholders' equity	2,929,122	2,898,125
Total liabilities and stockholders' equity	$ 4,847,306	$ 4,902,738

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Condensed Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 7,351	$ 8,798
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued	705,604,549	625,305,025
Common stock in treasury, shares	19,242,215	19,169,366

XML

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net revenue:
Net revenue	$ 120,264	$ 210,286
Cost of revenue:
Provision for loss contracts related to service	15,745	6,889
Total cost of revenue	279,339	279,682
Gross loss	(159,075)	(69,396)
Operating expenses:
Research and development	25,280	26,535
Selling, general and administrative	77,959	104,016
Restructuring	6,011
Impairment	284	1,083
Change in fair value of contingent consideration	(9,200)	8,769
Total operating expenses	100,334	140,403
Operating loss	(259,409)	(209,799)
Interest income	9,277	17,632
Interest expense	(11,325)	(10,650)
Other expense, net	(6,996)	(4,771)
Realized loss on investments, net		(1)
Change in fair value of equity securities		5,075
Loss on equity method investments	(13,113)	(5,317)
Loss on extinguishment of convertible senior notes	(14,047)
Loss before income taxes	(295,613)	(207,831)
Income tax (expense)/benefit	(163)	1,270
Net loss	$ (295,776)	$ (206,561)
Net loss per share:
Net loss per share, basic (in dollars per share)	$ (0.46)	$ (0.35)
Net loss per share, diluted (in dollars per share)	$ (0.46)	$ (0.35)
Weighted average number of common stock outstanding, basic (in shares)	641,256,134	589,205,165
Weighted average number of common stock outstanding, diluted (in shares)	641,256,134	589,205,165
Sales of equipment, related infrastructure and other
Net revenue:
Net revenue	$ 68,295	$ 182,094
Cost of revenue:
Cost of revenue	135,125	158,320
Services performed on fuel cell systems and related infrastructure
Net revenue:
Net revenue	13,023	9,097
Cost of revenue:
Cost of revenue	12,957	12,221
Power purchase agreements
Net revenue:
Net revenue	18,304	7,937
Cost of revenue:
Cost of revenue	55,228	46,816
Fuel delivered to customers and related equipment
Net revenue:
Net revenue	18,286	10,142
Cost of revenue:
Cost of revenue	58,573	54,501
Other
Net revenue:
Net revenue	2,356	1,016
Cost of revenue:
Cost of revenue	$ 1,711	$ 935

XML

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Condensed Consolidated Statements of Comprehensive Loss
Net loss	$ (295,776)	$ (206,561)
Foreign currency translation (loss)/gain	(2,276)	1,659
Change in net unrealized gain on available-for-sale securities		5,311
Comprehensive loss, net of tax	$ (298,052)	$ (199,591)

XML

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Gain/(Loss)	Treasury Stock	Accumulated Deficit	Total
Balance at Dec. 31, 2022	$ 6,084	$ 7,297,306	$ (26,004)	$ (96,261)	$ (3,120,911)	$ 4,060,214
Balance (in shares) at Dec. 31, 2022	608,421,785			18,076,127
Increase (Decrease) in Stockholders' Equity
Net loss					(206,561)	(206,561)
Other comprehensive loss			6,970			6,970
Stock-based compensation	$ 2	43,300				43,302
Stock-based compensation (in shares)	228,954
Stock option exercises and issuance of common stock upon grant/vesting of restricted stock and restricted stock unit awards	$ 6	668				674
Stock option exercises and issuance of common stock upon grant/vesting of restricted stock and restricted stock unit awards (in shares)	620,250
Treasury stock acquired from employees upon exercise of stock options and vesting of restricted stock and restricted stock unit awards				$ (2,590)		(2,590)
Treasury stock acquired from employees upon exercise of stock options and vesting of restricted stock and restricted stock unit awards (in shares)				169,787
Exercise of warrants	$ 28	(28)
Exercise of warrants (in shares)	2,680,637
Provision for common stock warrants		19,641				19,641
Balance at Mar. 31, 2023	$ 6,120	7,360,887	(19,034)	$ (98,851)	(3,327,472)	3,921,650
Balance (in shares) at Mar. 31, 2023	611,951,626			18,245,914
Balance at Dec. 31, 2023	$ 6,254	7,494,685	(6,802)	$ (106,268)	(4,489,744)	$ 2,898,125
Balance (in shares) at Dec. 31, 2023	625,305,025			19,169,366		625,305,025
Increase (Decrease) in Stockholders' Equity
Net loss					(295,776)	$ (295,776)
Other comprehensive loss			(2,276)			(2,276)
Stock-based compensation	$ 9	13,695				13,704
Stock-based compensation (in shares)	923,027
Public offerings, common stock, net of issuance costs	$ 796	304,550				305,346
Public offerings, common stock, net of issuance costs (in shares)	79,553,175
Stock option exercises and issuance of common stock upon grant/vesting of restricted stock and restricted stock unit awards	$ (2)	43				41
Stock option exercises and issuance of common stock upon grant/vesting of restricted stock and restricted stock unit awards (in shares)	(176,678)
Treasury stock acquired from employees upon exercise of stock options and vesting of restricted stock and restricted stock unit awards				$ (278)		(278)
Treasury stock acquired from employees upon exercise of stock options and vesting of restricted stock and restricted stock unit awards (in shares)				72,849
Provision for common stock warrants		10,236				10,236
Balance at Mar. 31, 2024	$ 7,057	$ 7,823,209	$ (9,078)	$ (106,546)	$ (4,785,520)	$ 2,929,122
Balance (in shares) at Mar. 31, 2024	705,604,549			19,242,215		705,604,549

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Operating activities
Net loss	$ (295,776)	$ (206,561)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of long-lived assets	16,606	9,789
Amortization of intangible assets	4,725	4,959
Lower of cost or net realizable value inventory adjustment and provision for excess and obsolete inventory	39,675	2,009
Stock-based compensation	13,704	43,302
Loss on extinguishment of convertible senior notes	14,047
(Recoveries)/provision for losses on accounts receivable	(1,447)	237
Amortization of debt issuance costs and discount on convertible senior notes	330	621
Provision for common stock warrants	4,495	14,175
Deferred income tax expense/(benefit)	163	(947)
Impairment	284	1,083
Loss on service contracts	3,809	221
Fair value adjustment to contingent consideration	(9,200)	8,769
Net realized loss on investments		1
Accretion of premium on available-for-sale securities		(5,945)
Lease origination costs	(1,331)	(2,660)
Change in fair value for equity securities		(5,075)
Loss on equity method investments	13,113	5,317
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable	96,436	1,493
Inventory	(38,312)	(131,581)
Contract assets	1,356	(14,677)
Prepaid expenses and other assets	(14,496)	(5,522)
Accounts payable, accrued expenses, and other liabilities	25,755	13,821
Payments of contingent consideration	(9,164)
Deferred revenue and other contract liabilities	(32,500)	(9,748)
Net cash used in operating activities	(167,728)	(276,919)
Investing activities
Purchases of property, plant and equipment	(92,621)	(168,565)
Purchases of equipment related to power purchase agreements and equipment related to fuel delivered to customers	(6,072)	(11,389)
Proceeds from maturities of available-for-sale securities		315,827
Cash paid for non-consolidated entities and non-marketable equity securities	(21,891)	(40,077)
Net cash (used in)/provided by investing activities	(120,584)	95,796
Financing activities
Payments of contingent consideration	(836)	(2,000)
Proceeds from public and private offerings, net of transaction costs	305,346
Payments of tax withholding on behalf of employees for net stock settlement of stock-based compensation	(278)	(2,590)
Proceeds from exercise of stock options	41	674
Principal payments on long-term debt	(300)	(330)
Proceeds from finance obligations		27,927
Principal repayments of finance obligations and finance leases	(20,908)	(16,500)
Net cash provided by financing activities	283,065	7,181
Effect of exchange rate changes on cash	4,187	(2,096)
Increase/(decrease) in cash and cash equivalents	37,840	(215,769)
(Decrease)/increase in restricted cash	(38,900)	39,731
Cash, cash equivalents, and restricted cash beginning of period	1,169,144	1,549,344	$ 1,549,344
Cash, cash equivalents, and restricted cash end of period	1,168,084	1,373,306	$ 1,169,144
Supplemental disclosure of cash flow information
Cash paid for interest, net of capitalized interest of $2.1 million and $2.0 million	9,111	7,869
Summary of non-cash activity
Recognition of right of use asset - finance leases		4,018
Recognition of right of use asset - operating leases	2,913	22,470
Accrued debt extinguishment costs, cash to be paid in subsequent period	1,245
Net transfers between inventory and long-lived assets	16,008	441
Accrued purchase of fixed assets, cash to be paid in subsequent period	$ 113,449	$ 65,701

XML

Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Condensed Consolidated Statements of Cash Flows
Net capitalized interest	$ 2.1	$ 2.0

XML

Nature of Operations

3 Months Ended

Mar. 31, 2024

Nature of Operations

Nature of Operations

1. Nature of Operations

Plug Power Inc. (the “Company”, “Plug”, “we” or “our”) is facilitating the paradigm shift to an increasingly electrified world by innovating cutting-edge hydrogen and fuel cell solutions. While we continue to develop commercially viable hydrogen and fuel cell product solutions, we have expanded our offerings to support a variety of commercial operations that can be powered with clean hydrogen. We provide electrolyzers that allow customers — such as refineries, producers of chemicals, steel, fertilizer and commercial refueling stations — to generate hydrogen on-site. We are focusing our efforts on (a) industrial mobility applications, including electric forklifts and electric industrial vehicles, at multi shift high volume manufacturing and high throughput distribution sites where we believe our products and services provide a unique combination of productivity, flexibility, and environmental benefits; (b) production of hydrogen; and (c) stationary power systems that will support critical operations, such as data centers, microgrids, and generation facilities, in either a backup power or continuous power role, and replace batteries, diesel generators or the grid for telecommunication logistics, transportation, and utility customers. Plug expects to support these products and customers with an ecosystem of vertically integrated products that produce, transport, store and handle, dispense, and use hydrogen for mobility and power applications.

Liquidity and Capital Resources

The Company’s working capital was $855.1 million as of March 31, 2024, which included unrestricted cash and cash equivalents of $172.9 million and restricted cash of $1.0 billion. On January 17, 2024, the Company entered into the At Market Issuance Sales Agreement (the “Original ATM Agreement”) with B. Riley Securities, Inc. (“B. Riley”), pursuant to which the Company may, from time to time, offer and sell through or to B. Riley, as sales agent or principal, shares of the Company’s common stock, having an aggregate offering price of up to $1.0 billion. As of February 23, 2024, the Company had $697.9 million remaining authorized for issuance under the Original ATM Agreement. On February 23, 2024, the Company and B. Riley entered into Amendment No. 1 to the Original ATM Agreement (the “Amendment” and, together with the Original ATM Agreement, the “ATM Agreement”) to increase the aggregate offering price of shares of the Company’s common stock available for future issuance under the Original ATM Agreement to $1.0 billion. Under the ATM Agreement, for a period of 18 months, the Company has the right at its sole discretion to direct B. Riley to act on a principal basis and purchase directly from the Company up to $11.0 million of shares of its common stock on any trading day (the “Maximum Commitment Advance Purchase Amount”) and up to $55.0 million of shares in any calendar week (the “Maximum Commitment Advance Purchase Amount Cap”). On and after June 1, 2024, so long as the Company’s market capitalization is no less than $1.0 billion, the Maximum Commitment Advance Purchase Amount will remain $11.0 million and the Maximum Commitment Advance Purchase Amount Cap will remain $55.0 million. If the Company’s market capitalization is less than $1.0 billion on and after June 1, 2024, the Maximum Commitment Advance Purchase Amount will be decreased to $10.0 million and the Maximum Commitment Advance Purchase Amount Cap will be decreased to $30.0 million. Through the date of filing of the Quarterly Report on Form 10-Q, the Company sold 135,354,467 shares of common stock at a weighted-average sales price of $3.38 per share for gross proceeds of $457.1 million with related issuance costs of $6.5 million. The Company believes that its working capital and cash position, together with its right to direct B. Riley to purchase shares directly from the Company under the ATM Agreement, will be sufficient to fund its on-going operations for a period of at least 12 months subsequent to the issuance of the accompanying condensed consolidated financial statements.

XML

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2024

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Principles of Consolidation

The unaudited interim condensed consolidated financial statements include the financial statements of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. In addition, we include our share of the results of our joint ventures with Renault SAS (“Renault”) named HyVia SAS, a French société par actions simplifiée (“HyVia”), AccionaPlug S.L. (“AccionaPlug”), and SK Plug Hyverse Co., Ltd. (“SK Plug Hyverse”), and our investment in Clean H2 Infra Fund, using the equity method based on our economic ownership interest and our ability to exercise significant influence over the operating and financial decisions of HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund.

Interim Financial Statements

The accompanying unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, which consist solely of normal recurring adjustments, necessary to present fairly, in accordance with U.S. generally accepted accounting principles (“GAAP”), the financial position, results of operations and cash flows for all periods presented, have been made. The results of operations for the interim periods presented are not necessarily indicative of the results that may be expected for the full year.

Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “2023 Form 10-K”).

The information presented in the accompanying unaudited interim condensed consolidated balance sheets as of December 31, 2023 has been derived from the Company’s 2023 audited consolidated financial statements.

The unaudited interim condensed consolidated financial statements contained herein should be read in conjunction with our 2023 Form 10-K.

Reclassification

Certain prior year amounts in the unaudited interim condensed consolidated statements of cash flows have been reclassified to conform to the current year presentation. These reclassifications had no effect on the reported results of operations.

Recent Accounting Pronouncements

Recently Adopted Accounting Guidance

There have been no significant changes in our reported financial position or results of operations and cash flows resulting from the adoption of new accounting pronouncements.

Recent Accounting Guidance Not Yet Effective

All issued but not yet effective accounting and reporting standards as of March 31, 2024 are either not applicable to the Company or are not expected to have a material impact on the Company.

XML

Extended Maintenance Contracts

3 Months Ended

Mar. 31, 2024

Extended Maintenance Contracts

Extended Maintenance Contracts

3. Extended Maintenance Contracts

On a quarterly basis, we evaluate any potential losses related to our extended maintenance contracts for sales of equipment, related infrastructure and other that have been sold. The following table shows the roll forward of balances in

the accrual for loss contracts, including changes due to the provision for loss accrual, releases to service cost of sales, increase to loss accrual related to warrants, and foreign currency translation adjustment (in thousands):

	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Beginning balance	$	137,853	$	81,066
Provision for loss accrual		15,111		85,375
Releases to service cost of sales		(11,936)		(29,713)
Increase to loss accrual related to customer warrants		634		971
Foreign currency translation adjustment		(93)		154
Ending balance	$	141,569	$	137,853

The Company increased its loss accrual to $141.6 million for the three months ended March 31, 2024 primarily due to continued cost increases of GenDrive labor, parts and related overhead coupled with new GenDrive contracts entered into requiring provisions to be set up. As a result, the Company increased its estimated projected costs.

XML

Earnings Per Share

3 Months Ended

Mar. 31, 2024

Earnings Per Share

Earnings Per Share

4. Earnings Per Share

Basic earnings per common stock are computed by dividing net loss by the weighted average number of common stock outstanding during the reporting period. Since the Company is in a net loss position, all common stock equivalents would be considered anti-dilutive and are therefore not included in the determination of diluted earnings per share. Accordingly, basic and diluted loss per share are the same.

The potentially dilutive securities are summarized as follows:

	At March 31,
	2024	2023
Stock options outstanding (1)	36,384,062	27,479,533
Restricted stock and restricted stock units outstanding (2)	5,914,856	5,888,013
Common stock warrants (3)	78,561,263	85,879,175
Convertible Senior Notes (4)	44,661,605	39,170,766
Number of dilutive potential shares of common stock	165,521,786	158,417,487

(1) During the three months ended March 31, 2024 and 2023, the Company granted options for 313,000 and 94,550 shares of common stock, respectively.

(2) During the three months ended March 31, 2024 and 2023, the Company granted 17,000 and 94,550 shares of restricted stock and restricted stock units, respectively.

(3) In August 2022, the Company issued a warrant to acquire up to 16,000,000 shares of the Company’s common stock as part of a transaction agreement with Amazon.com, Inc. (“Amazon”), subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had not been exercised as of March 31, 2024 and 2023, respectively.

In April 2017, the Company issued a warrant to acquire up to 55,286,696 shares of the Company’s common stock as part of a transaction agreement with Amazon, subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had been exercised with respect to 34,917,912 and 27,600,000 shares of the Company’s common stock as of March 31, 2024 and 2023, respectively.

In July 2017, the Company issued a warrant to acquire up to 55,286,696 shares of the Company’s common stock as part of a transaction agreement with Walmart, Inc. (“Walmart”), subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had been exercised with respect to 13,094,217 shares of the Company’s common stock as of March 31, 2024 and 2023.

(4) In May 2020, the Company issued $212.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes due 2025 (the “3.75% Convertible Senior Notes”) as described in Note 9, “Convertible Senior Notes”. There were no conversions of the 3.75% Convertible Senior Notes for the three months ended March 31, 2024 and 2023.

In March 2024, the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes for $140.4 million in aggregate principal amount of the 7.00% Convertible Senior Notes due 2026 (the “7.00% Convertible Senior Notes”) as described in Note 9, “Convertible Senior Notes”. There were no conversions of the 7.00% Convertible Senior Notes for the three months ended March 31, 2024 and 2023.

XML

Inventory

3 Months Ended

Mar. 31, 2024

Inventory

Inventory

5. Inventory

Inventory as of March 31, 2024 and December 31, 2023 consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Raw materials and supplies - production locations	$	543,196	$	564,818
Raw materials and supplies - customer locations		31,142		20,751
Work-in-process		156,146		149,574
Finished goods		245,414		226,110
Inventory	$	975,898	$	961,253

Inventory is primarily comprised of raw materials, work-in-process, and finished goods. The Company had inventory reserves made up of excess and obsolete items and related lower of cost or net realizable value adjustments of $117.7 million and $85.2 million as of March 31, 2024 and December 31, 2023, respectively.

XML

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2024

Property, Plant and Equipment

Property, Plant and Equipment

6. Property, Plant and Equipment

Property, plant and equipment at March 31, 2024 and December 31, 2023 consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Land	$	5,951	$	6,049
Construction in progress		852,555		1,109,896
Hydrogen production plants		351,390		77,107
Building and leasehold improvements		96,850		95,229
Software, machinery, and equipment		243,198		229,352
Property, plant and equipment		1,549,944		1,517,633
Less: accumulated depreciation		(95,953)		(81,456)
Property, plant and equipment, net	$	1,453,991	$	1,436,177

Construction in progress is primarily comprised of construction of three hydrogen production plants. Completed assets are transferred to their respective asset classes, and depreciation begins when an asset is ready for its intended use. Interest on outstanding debt is capitalized during periods of capital asset construction and amortized over the useful lives of the related assets. During the three months ended March 31, 2024 and 2023, the Company capitalized $2.1 million and $2.0 million of interest, respectively.

Depreciation expense related to property, plant and equipment was $11.6 million and $5.5 million for the three months ended March 31, 2024 and 2023, respectively.

XML

Intangible Assets

3 Months Ended

Mar. 31, 2024

Intangible Assets

Intangible Assets

7. Intangible Assets

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of March 31, 2024 were as follows (in thousands):

	Weighted Average	Gross Carrying		Accumulated
	Amortization Period	Amount		Amortization		Total
Acquired technology	14 years	$	102,880	$	(21,979)	$	80,901
Dry stack electrolyzer technology	10 years		29,000		(6,042)		22,958
Customer relationships, trade name and other	13 years		103,002		(23,536)		79,466
		$	234,882	$	(51,557)	$	183,325

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2023 were as follows (in thousands):

	Weighted Average	Gross Carrying		Accumulated
	Amortization Period	Amount		Amortization		Total
Acquired technology	14 years	$	103,060	$	(20,204)	$	82,856
Dry stack electrolyzer technology	10 years		29,000		(5,317)		23,683
Customer relationships, trade name and other	13 years		103,981		(21,634)		82,347
		$	236,041	$	(47,155)	$	188,886

The change in the gross carrying amount of the acquired technology and customer relationships, trade name and other from December 31, 2023 to March 31, 2024 was due to changes in foreign currency translation.

Amortization expense for acquired identifiable intangible assets for the three months ended March 31, 2024 and 2023 was $4.4 million and $5.0 million, respectively.

The estimated amortization expense for subsequent years is as follows (in thousands):

Remainder of 2024	$	14,132
2025		18,070
2026		16,487
2027		16,480
2028		16,071
2029 and thereafter		102,085
Total	$	183,325

XML

Long-Term Debt

3 Months Ended

Mar. 31, 2024

Long-Term Debt

Long-Term Debt

8. Long-Term Debt

In June 2020, the Company acquired debt as part of its acquisition of United Hydrogen Group Inc. During the three months ended March 31, 2024, the Company repaid $0.3 million of principal related to this outstanding debt. The outstanding carrying value of the debt was $3.8 million as of March 31, 2024. The remaining outstanding principal on the debt was $5.2 million and the unamortized debt discount was $1.4 million, bearing varying interest rates ranging from 7.3% to 7.6%. The debt is scheduled to mature in 2026. As of March 31, 2024, the principal balance is due at each of the following dates as follows (in thousands):

December 31, 2024		3,057
December 31, 2025		1,200
December 31, 2026		900
Total outstanding principal	$	5,157

XML

Convertible Senior Notes

3 Months Ended

Mar. 31, 2024

Convertible Senior Notes

Convertible Senior Notes

9. Convertible Senior Notes

7.00% Convertible Senior Notes

On March 20, 2024, the Company entered into separate, privately negotiated exchange agreements with certain holders of the Company’s outstanding 3.75% Convertible Senior Notes pursuant to which the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes, and accrued and unpaid interest of $1.6 million on such notes to, but excluding, March 20, 2024, for $140.4 million in aggregate principal amount of the Company’s new 7.00% Convertible Senior Notes due 2026, in each case, pursuant to the exemption from registration provided by Section 4(a)(2) under the Securities Act of 1933, as amended (the “Securities Act”). Following the exchange, approximately $58.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes remained outstanding with terms unchanged.

This transaction was accounted for as an extinguishment of debt. As a result, the Company recorded a loss on extinguishment of debt of $14.0 million in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024. Loss on extinguishment of debt arises from the difference between the net carrying amount of the Company’s debt and the fair value of the assets transferred to extinguish the debt.

The 7.00% Convertible Senior Notes are the Company’s senior, unsecured obligations and are governed by the terms of an Indenture (the “Indenture”), dated as of March 20, 2024, entered into between the Company and Wilmington Trust, National Association, as trustee. The 7.00% Convertible Senior Notes bear cash interest at the rate of 7.00% per annum, payable semi-annually in arrears on June 1 and December 1 of each year, beginning on June 1, 2024, to holders of record at the close of business on the preceding May 15 and November 15, respectively. The 7.00% Convertible Senior Notes mature on June 1, 2026, unless earlier converted or redeemed or repurchased by the Company.

The conversion rate for the 7.00% Convertible Senior Notes is initially 235.4049 shares of the Company’s common stock per $1,000 principal amount of 7.00% Convertible Senior Notes, which is equivalent to an initial conversion price of approximately $4.25 per share of common stock, which represents a premium of approximately 20% over the last reported sale price of Plug’s common stock on the Nasdaq Capital Market on March 12, 2024. The conversion rate and conversion price are subject to customary adjustments upon the occurrence of certain events. Prior to the close of business on the business day immediately preceding December 1, 2025, the 7.00% Convertible Senior Notes will be convertible at the option of the holders of the 7.00% Convertible Senior Notes only upon the satisfaction of specified conditions and during certain periods. On or after December 1, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, the 7.00% Convertible Senior Notes will be convertible at the option of the holders of the 7.00% Convertible Senior Notes at any time regardless of these conditions. Conversions of the 7.00% Convertible Senior Notes will be settled in cash, shares of the Company’s common stock, or a combination thereof, at the Company’s election.

Subject to certain exceptions and subject to certain conditions, holders of the 7.00% Convertible Senior Notes may require the Company to repurchase their 7.00% Convertible Senior Notes upon the occurrence of a “Fundamental Change” (as defined in the Indenture) prior to maturity for cash at a repurchase price equal to 100% of the principal amount of the 7.00% Convertible Senior Notes to be repurchased plus accrued and unpaid interest, if any, to, but excluding, the repurchase date.

The 7.00% Convertible Senior Notes will be redeemable, in whole or in part, at the Company’s option at any time on or after June 5, 2025, at a cash redemption price equal to the principal amount of the 7.00% Convertible Senior Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, but only if the last reported sale price per share of the Company’s common stock exceeds 130% of the then-applicable conversion price then in effect for at least 20 trading days (whether or not consecutive), including at least one of the three trading days immediately preceding the date the Company sends the related redemption notice, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company sends such redemption notice.

In certain circumstances, conversions of 7.00% Convertible Senior Notes in connection with “Make-Whole Fundamental Changes” (as defined in the Indenture) or conversions of 7.00% Convertible Senior Notes called for redemption may result in an increase to the conversion rate, provided that the conversion rate will not exceed 282.4859 shares of the Company’s common stock per $1,000 principal amount of 7.00% Convertible Senior Notes, subject to adjustment. In such circumstance, a maximum of 39,659,890 shares of common stock, subject to adjustment, may be issued upon conversion of the 7.00% Convertible Senior Notes. There were no conversions of the 7.00% Convertible Senior Notes during the three months ended March 31, 2024.

The 7.00% Convertible Senior Notes consisted of the following (in thousands):

	March 31,
	2024
Principal amounts:
Principal	$	140,396
Unamortized debt premium, net of offering costs (1)		11,440
Net carrying amount	$	151,836

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

The following table summarizes the total interest expense and effective interest rate related to the 7.00% Convertible Senior Notes for the three months ended March 31, 2024 (in thousands, except for the effective interest rate):

	March 31,
	2024
Interest expense	$	296
Amortization of premium		(159)
Total	$	137
Effective interest rate		3.0%

The estimated fair value of the 7.00% Convertible Senior Notes at March 31, 2024 was approximately $153.2 million. The fair value estimation was primarily based on a quoted price in an active market.

3.75% Convertible Senior Notes

On May 18, 2020, the Company issued $200.0 million in aggregate principal amount of 3.75% Convertible Senior Notes due June 1, 2025 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act. On May 29, 2020, the Company issued an additional $12.5 million in aggregate principal amount of 3.75% Convertible Senior Notes. On March 12, 2024, the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes for $140.4 million in aggregate principal amount of the Company’s new 7.00% Convertible Senior Notes due 2026. Following the exchange, approximately $58.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes remained outstanding with terms unchanged. There were no conversions of the 3.75% Convertible Senior Notes during the three months ended March 31, 2024 and 2023.

The 3.75% Convertible Senior Notes consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Principal amounts:
Principal	$	58,462	$	197,278
Unamortized debt issuance costs (1)		(496)		(2,014)
Net carrying amount	$	57,966	$	195,264

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

The following table summarizes the total interest expense and effective interest rate related to the 3.75% Convertible Senior Notes for the three months ended March 31, 2024 and 2023 (in thousands, except for the effective interest rate):

	March 31,			March 31,
	2024			2023
Interest expense	$	1,690	$	1,849
Amortization of debt issuance costs		316		331
Total	$	2,006	$	2,180
Effective interest rate		4.5%		4.5%

The estimated fair value of the 3.75% Convertible Senior Notes at March 31, 2024 was approximately $60.4 million. The fair value estimation was primarily based on a quoted price in an active market.

Capped Call

In conjunction with the pricing of the 3.75% Convertible Senior Notes, the Company entered into privately negotiated capped call transactions (the “3.75% Notes Capped Call”) with certain counterparties at a price of $16.2 million. The 3.75% Notes Capped Call covers, subject to anti-dilution adjustments, the aggregate number of shares of the Company’s common stock that underlie the initial 3.75% Convertible Senior Notes and is generally expected to reduce potential dilution to the Company’s common stock upon any conversion of the 3.75% Convertible Senior Notes and/or offset any cash payments the Company is required to make in excess of the principal amount of the converted notes, as the case may be, with such reduction and/or offset subject to a cap based on the cap price. The cap price of the 3.75% Notes Capped Call is initially $6.7560 per share, which represents a premium of approximately 60% over the last then-reported sale price of the Company’s common stock of $4.11 per share on the date of the transaction and is subject to certain adjustments under the terms of the 3.75% Notes Capped Call. The 3.75% Notes Capped Call becomes exercisable if the conversion option is exercised.

The net cost incurred in connection with the 3.75% Notes Capped Call was recorded as a reduction to additional paid-in capital in the unaudited interim condensed consolidated balance sheets. The book value of the 3.75% Notes Capped Call is not remeasured.

5.5% Convertible Senior Notes and Common Stock Forward

In March 2018, the Company issued $100.0 million in aggregate principal amount of the 5.5% Convertible Senior Notes due on March 15, 2023, in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act, which have been fully repaid. In connection with the issuance of the 5.5% Convertible Senior Notes, the Company entered into a forward stock purchase transaction (the “Common Stock Forward”), pursuant to which the Company agreed to purchase 14,397,906 shares of its common stock for settlement on or about March 15, 2023. On May 18, 2020, the Company amended and extended the maturity of the Common Stock Forward to June 1, 2025. The number of shares of common stock that the Company will ultimately repurchase under the Common Stock Forward is subject to

customary anti-dilution adjustments. The Common Stock Forward is subject to early settlement or settlement with alternative consideration in the event of certain corporate transactions.

The net cost incurred in connection with the Common Stock Forward of $27.5 million was recorded as an increase in treasury stock in the unaudited interim condensed consolidated balance sheets. The related shares were accounted for as a repurchase of common stock. The book value of the Common Stock Forward is not remeasured.

There were no shares of common stock that settled in connection with the Common Stock Forward during the three months ended March 30, 2024 and 2023.

XML

Stockholders' Equity

3 Months Ended

Mar. 31, 2024

Stockholders' Equity

Stockholders' Equity

10. Stockholders’ Equity

At Market Issuance Sales Agreement

On January 17, 2024, the Company entered into an At Market Issuance Sales Agreement with B. Riley, pursuant to which the Company may, from time to time, offer and sell through or to B. Riley, as sales agent or principal, shares of the Company’s common stock, having an aggregate offering price of up to $1.0 billion. As of February 23, 2024, the Company had $697.9 million remaining authorized for issuance under the ATM Agreement. On February 23, 2024, the Company amended the ATM Agreement to increase the amount of shares of the Company’s common stock available for sale under the ATM Agreement to $1.0 billion. During the three months ended March 31, 2024, the Company sold 79,553,175 shares of common stock at a weighted-average sales price of $3.89 per share for gross proceeds of $309.3 million with related issuance costs of $3.9 million.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss is comprised of unrealized gains and losses on available-for-sale securities and foreign currency translation gains and losses. There were no reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2024 and 2023, respectively.

Net current-period other comprehensive loss for the three months ended March 31, 2024 increased due to foreign currency translation losses of $2.3 million. Net current-period other comprehensive income for the three months ended March 31, 2023 increased due to unrealized gains on available-for-sale securities of $5.3 million and foreign currency translation gains of $1.7 million.

XML

Warrant Transaction Agreements

3 Months Ended

Mar. 31, 2024

Warrant Transaction Agreements

Warrant Transaction Agreements

11. Warrant Transaction Agreements

Amazon Transaction Agreement in 2022

On August 24, 2022, the Company and Amazon entered into a Transaction Agreement (the “2022 Amazon Transaction Agreement”), under which the Company concurrently issued to Amazon.com NV Investment Holdings LLC, a wholly owned subsidiary of Amazon, a warrant (the “2022 Amazon Warrant”) to acquire up to 16,000,000 shares (the “2022 Amazon Warrant Shares”) of the Company’s common stock, subject to certain vesting events described below. The Company and Amazon entered into the 2022 Amazon Transaction Agreement in connection with a concurrent commercial arrangement under which Amazon agreed to purchase hydrogen fuel from the Company through August 24, 2029.

1,000,000 of the 2022 Amazon Warrant Shares vested immediately upon issuance of the 2022 Amazon Warrant. 15,000,000 of the 2022 Amazon Warrant Shares will vest in multiple tranches over the 7-year term of the 2022 Amazon Warrant based on payments made to the Company directly by Amazon or its affiliates, or indirectly through third parties, with 15,000,000 of the 2022 Amazon Warrant Shares fully vesting if Amazon-related payments of $2.1 billion are made in the aggregate. The exercise price for the first 9,000,000 2022 Amazon Warrant Shares is $22.9841 per share and the fair value on the grant date was $20.36. The exercise price for the remaining 7,000,000 2022 Amazon Warrant Shares will be an amount per share equal to 90% of the 30-day volume weighted average share price of the Company’s common stock

as of the final vesting event that results in full vesting of the first 9,000,000 2022 Amazon Warrant Shares. The 2022 Amazon Warrant is exercisable through August 24, 2029.

Upon the consummation of certain change of control transactions (as defined in the 2022 Amazon Warrant) prior to the vesting of at least 60% of the aggregate 2022 Amazon Warrant Shares, the 2022 Amazon Warrant will automatically vest and become exercisable with respect to an additional number of 2022 Amazon Warrant Shares such that 60% of the aggregate 2022 Amazon Warrant Shares shall have vested. If a change of control transaction is consummated after the vesting of at least 60% of the aggregate 2022 Amazon Warrant Shares, then no acceleration of vesting will occur with respect to any of the unvested 2022 Amazon Warrant Shares as a result of the transaction. The exercise price and the 2022 Amazon Warrant Shares issuable upon exercise of the 2022 Amazon Warrant are subject to customary antidilution adjustments.

On August 24, 2022, 1,000,000 of the 2022 Amazon Warrant Shares associated with tranche 1 vested. The warrant fair value associated with the vested shares of tranche 1 of $20.4 million was capitalized to contract assets based on the grant date fair value and is subsequently amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement. As of March 31, 2024 the balance of the contract asset related to tranche 1 was $19.3 million which is recorded in contract assets in the Company’s unaudited interim condensed consolidated balance sheet. During the second quarter of 2023, all 1,000,000 of the 2022 Amazon Warrant Shares associated with tranche 2 vested. The warrant fair value associated with the vested shares of tranche 2 was $20.4 million and was determined on the grant date of August 24, 2022. As of March 31, 2024 the balance of the contract asset related to tranche 2 was $19.3 million. Tranche 3 will vest over the next $1.0 billion of collections from Amazon and its affiliates. The grant date fair value of tranche 3 will also be amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement. As of March 31, 2024 the balance of the contract asset related to tranche 3 was $2.0 million. Because the exercise price has yet to be determined, the fair value of tranche 4 will be remeasured at each reporting period end and amortized ratably as a reduction to revenue based on the Company’s estimate of revenue over the term of the agreement.

As of March 31, 2024 and December 31, 2023, 2,000,000 of the 2022 Amazon Warrant Shares had vested and the 2022 Amazon Warrant had not been exercised. The total amount of provision for common stock warrants recorded as a reduction of revenue for the 2022 Amazon Warrant during the three months ended March 31, 2024 and 2023 was $0.7 million and $1.1 million, respectively.

The assumptions used to calculate the valuations of the 2022 Amazon Warrant as of August 24, 2022 and March 31, 2024 are as follows:

	Tranches 1-3	Tranche 4
	August 24, 2022	March 31, 2024
Risk-free interest rate	3.15%	4.12%
Volatility	75.00%	90.00%
Expected average term (years)	7.00	4.00
Exercise price	$22.98	$3.10
Stock price	$20.36	$3.44

Amazon Transaction Agreement in 2017

On April 4, 2017, the Company and Amazon entered into a Transaction Agreement (the “2017 Amazon Transaction Agreement”), pursuant to which the Company agreed to issue to Amazon.com NV Investment Holdings LLC, a warrant (the “2017 Amazon Warrant”) to acquire up to 55,286,696 shares (the “2017 Amazon Warrant Shares”), subject to certain vesting events. The Company and Amazon entered into the 2017 Amazon Transaction Agreement in connection with existing commercial agreements between the Company and Amazon with respect to the deployment of the Company’s GenKey fuel cell technology at Amazon distribution centers. The vesting of the 2017 Amazon Warrant Shares was conditioned upon payments made by Amazon or its affiliates (directly or indirectly through third parties) pursuant to existing commercial agreements. On December 31, 2020, the Company waived the remaining vesting conditions under

the 2017 Amazon Warrant, which resulted in the immediate vesting of all of the third tranche of the 2017 Amazon Warrant Shares.

As of March 31, 2024 and 2023, all 55,286,696 of the 2017 Amazon Warrant Shares had vested and the 2017 Amazon Warrant was exercised with respect to 34,917,912 shares of the Company’s common stock. The total amount of provision for common stock warrants recorded as a reduction of revenue for the 2017 Amazon Warrant during the three months ended March 31, 2024 and 2023 was $0.1 million and $0.2 million, respectively.

Walmart Transaction Agreement

On July 20, 2017, the Company and Walmart entered into a Transaction Agreement (the “Walmart Transaction Agreement”), pursuant to which the Company agreed to issue to Walmart a warrant (the “Walmart Warrant”) to acquire up to 55,286,696 shares of the Company’s common stock, subject to certain vesting events (the “Walmart Warrant Shares”). The Company and Walmart entered into the Walmart Transaction Agreement in connection with existing commercial agreements between the Company and Walmart with respect to the deployment of the Company’s GenKey fuel cell technology across various Walmart distribution centers. The existing commercial agreements contemplate, but do not guarantee, future purchase orders for the Company’s fuel cell technology. The vesting of the warrant shares was conditioned upon payments made by Walmart or its affiliates (directly or indirectly through third parties) pursuant to transactions entered into after January 1, 2017 under existing commercial agreements.

The exercise price for the first and second tranches of Walmart Warrant Shares was $2.1231 per share. After Walmart has made payments to the Company totaling $200.0 million, the third tranche of 20,368,784 Walmart Warrant Shares will vest in eight installments of 2,546,098 Walmart Warrant Shares each time Walmart or its affiliates, directly or indirectly through third parties, make an aggregate of $50.0 million in payments for goods and services to the Company, up to payments totaling $400.0 million in the aggregate. The exercise price of the third tranche of the Walmart Warrant Shares is $6.28 per share, which was determined pursuant to the terms of the Walmart Warrant as an amount equal to 90% of the 30-day volume weighted average share price of the Company’s common stock as of October 30, 2023, the final vesting date of the second tranche of the Walmart Warrant Shares. The Walmart Warrant is exercisable through July 20, 2027. The Walmart Warrant provides for net share settlement that, if elected by the holder, will reduce the number of shares issued upon exercise to reflect net settlement of the exercise price. The Walmart Warrant provides for certain adjustments that may be made to the exercise price and the number of shares of common stock issuable upon exercise due to customary anti-dilution provisions based on future events. The Walmart Warrant is classified as an equity instrument.

As of March 31, 2024 and December 31, 2023, 37,464,010 and 34,917,912 of the Walmart Warrant Shares had vested, respectively, and the Walmart Warrant was exercised with respect to 13,094,217 shares of the Company’s common stock. As of March 31, 2024, the balance of the contract asset related to the Walmart Warrant was $6.9 million. The total amount of provision for common stock warrants recorded as a reduction of revenue for the Walmart Warrant during the three months ended March 31, 2024 and 2023 was $3.7 million and $12.9 million, respectively.

The assumptions used to calculate the valuations of the Walmart Warrant as of January 1, 2019 and October 30, 2023 are as follows:

	Tranches 1-2	Tranche 3
	January 1, 2019	October 30, 2023
Risk-free interest rate	2.63%	4.73%
Volatility	95.00%	75.00%
Expected average term (years)	8.55	3.72
Exercise price	$2.12	$6.28
Stock price	$1.24	$5.70

XML

Revenue

3 Months Ended

Mar. 31, 2024

Revenue

Revenue

12. Revenue

Disaggregation of revenue

The following table provides information about disaggregation of revenue (in thousands):

Major products/services lines	Three months ended
	March 31,
	2024		2023
Sales of fuel cell systems	$	19,003	$	28,852
Sales of hydrogen infrastructure		12,295		48,868
Sales of electrolyzers		1,351		40,032
Sales of engineered equipment		4,216		7,753
Services performed on fuel cell systems and related infrastructure		13,023		9,097
Power purchase agreements		18,304		7,937
Fuel delivered to customers and related equipment		18,286		10,142
Sales of cryogenic equipment and other		31,430		56,589
Other		2,356		1,016
Net revenue	$	120,264	$	210,286

Contract balances

The following table provides information about receivables, contract assets and deferred revenue and contract liabilities from contracts with customers (in thousands):

	March 31,		December 31,
	2024		2023
Accounts receivable	$	148,822	$	243,811
Contract assets		160,374		155,989
Deferred revenue and contract liabilities		255,802		288,302

Contract assets primarily relate to contracts for which revenue is recognized on a straight-line basis; however, billings escalate over the life of a contract. Contract assets also include amounts recognized as revenue in advance of billings to customers, which are dependent upon the satisfaction of another performance obligation. These amounts are included in contract assets on the accompanying unaudited interim condensed consolidated balance sheets.

The deferred revenue and contract liabilities relate to the advance consideration received from customers for services that will be recognized over time (primarily fuel cell and related infrastructure services and electrolyzer systems and solutions). Deferred revenue and contract liabilities also include advance consideration received from customers prior to delivery of products. These amounts are included within deferred revenue and other contract liabilities on the unaudited interim condensed consolidated balance sheets.

Significant changes in the contract assets and the deferred revenue and contract liabilities balances during the period are as follows (in thousands):

Contract assets	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Transferred to receivables from contract assets recognized at the beginning of the period	$	(9,082)	$	(94,860)
Change in contract assets related to warrants		5,850		14,260
Impairment		—		(2,375)
Revenue recognized and not billed as of the end of the period		7,617		134,677
Net change in contract assets	$	4,385	$	51,702

Deferred revenue and contract liabilities	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Increases due to customer billings, net of amounts recognized as revenue during the period	$	12,057	$	151,965
Change in contract liabilities related to warrants		110		440
Revenue recognized that was included in the contract liability balance as of the beginning of the period		(44,667)		(94,001)
Net change in deferred revenue and contract liabilities	$	(32,500)	$	58,404

Estimated future revenue

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period, including provision for common stock warrants (in thousands):

	March 31,		Expected recognition
	2024		period (years)
Sales of fuel cell systems	$	55,671		1 - 2
Sales of hydrogen installations and other infrastructure		31,039		1
Sales of electrolyzers		303,127		1 - 2
Sales of engineered equipment		14,559		1
Services performed on fuel cell systems and related infrastructure		142,111		5 - 10
Power purchase agreements		419,406		5 - 10
Fuel delivered to customers and related equipment		93,685		5 - 10
Sales of cryogenic equipment and other		77,105		1
Total estimated future revenue	$	1,136,703

XML

Income Taxes

3 Months Ended

Mar. 31, 2024

Income Taxes

Income Taxes

13. Income Taxes

The Company recorded $0.2 million of income tax expense and $1.3 million of income tax benefit for the three months ended March 31, 2024 and 2023, respectively. The income tax expense for the three months ended March 31, 2024 was due to an incremental change to the valuation allowance recorded in foreign jurisdictions. The Company has not changed its overall conclusion with respect to the need for a valuation allowance against its domestic net deferred tax assets, which remain fully reserved, and its valuation allowances recorded in foreign jurisdictions.

The domestic net deferred tax asset generated from the Company’s net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized. The Company recognizes accrued interest and penalties related to unrecognized tax benefits, if any, as a component of income tax expense.

The Organization for Economic Co-operation and Development Inclusive Framework on Base Erosion and Profit Shifting has proposed a global minimum corporate tax rate of 15% on multi-national corporations, commonly referred to as the Pillar Two rules that has been agreed upon in principle by over 140 countries. Numerous foreign countries have enacted legislation to implement the Pillar Two rules, effective beginning January 1, 2024, or are expected to enact similar legislation. As of March 31, 2024, the Company did not meet the consolidated revenue threshold and is not subject to the GloBE Rules under Pillar Two. The Company will continue to monitor the implementation of rules in the jurisdictions in which it operates.

XML

Fair Value Measurements

3 Months Ended

Mar. 31, 2024

Fair Value Measurements

Fair Value Measurements

14. Fair Value Measurements

The Company records the fair value of assets and liabilities in accordance with ASC 820, Fair Value Measurement (“ASC 820”). ASC 820 defines fair value as the price received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and in the principal or most advantageous market for that asset or liability. The fair value should be calculated based on assumptions that market participants would use in pricing the asset or liability, not on assumptions specific to the entity.

In addition to defining fair value, ASC 820 expands the disclosure requirements around fair value and establishes a fair value hierarchy for valuation inputs. The hierarchy prioritizes the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of the three levels, which is determined by the lowest level input that is significant to the fair value measurement in its entirety.

These levels are:

● Level 1 — quoted prices (unadjusted) in active markets for identical assets or liabilities.

● Level 2 — quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.

● Level 3 — unobservable inputs reflecting management’s own assumptions about the inputs used in pricing the asset or liability at fair value.

There were no transfers between Level 1, Level 2, or Level 3 for the three months ended March 31, 2024. Financial instruments not recorded at fair value on a recurring basis include equity method investments that have not been remeasured or impaired in the current period, such as our investments in HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund.

Assets and liabilities measured at fair value on a recurring basis are summarized below (in thousands):

		As of March 31, 2024
		Carrying		Fair		Fair Value Measurements
		Amount		Value		Level 1		Level 2		Level 3
Liabilities
Contingent consideration	$	106,326	$	106,326	$	—	$	—	$	106,326

	As of December 31, 2023
	Carrying	Fair	Fair Value Measurements
	Amount	Value	Level 1	Level 2	Level 3
Liabilities
Contingent consideration	126,216	126,216	—	—	126,216

The liabilities measured at fair value on a recurring basis that have unobservable inputs and are therefore categorized as level 3 are related to contingent consideration. The fair value as of March 31, 2024 of $106.3 million is comprised of contingent consideration related to the Joule Processing LLC (“Joule”) acquisition in 2022, the Frames Holding B.V. (“Frames”) acquisition in 2021 and the Giner ELX, Inc. (“Giner”) and United Hydrogen Group Inc. (“UHG”) acquisitions in 2020.

In connection with the Joule acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $41.7 million representing the fair value of contingent consideration payable. The

fair value of this contingent consideration was $58.0 million and $75.5 million as of March 31, 2024 and December 31, 2023, respectively. The decrease compared to the year ended December 31, 2023 was partially due to payments that reduced the fair value of the liability by $10.0 million during the three months ended March 31, 2024. A further decrease of $7.5 million was recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024.

In connection with the Frames acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $29.1 million representing the fair value of contingent consideration payable. The fair value of this contingent consideration was $28.6 million and $31.8 million as of March 31, 2024 and December 31, 2023, respectively. The decrease compared to the year ended December 31, 2023 was primarily due to a decrease of $2.5 million recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024. A further decrease of $0.7 million was due to foreign currency translation gains.

In connection with the Giner acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $16.0 million representing the fair value of contingent consideration payable. The fair value of this contingent consideration was $18.7 million and $18.0 million as of March 31, 2024 and December 31, 2023, respectively. The increase compared to December 31, 2023 was recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024.

In connection with the UHG acquisition, the Company initially recorded on its unaudited interim condensed consolidated balance sheet a liability of $1.1 million representing the fair value of contingent consideration payable. The fair value of this contingent consideration was $1.0 million and $0.9 million as of March 31, 2024 and December 31, 2023, respectively. The increase compared to December 31, 2023 was recorded in change in fair value of contingent consideration in the unaudited interim condensed consolidated statement of operations for the three months ended March 31, 2024, respectively.

In the unaudited interim condensed consolidated balance sheets, contingent consideration is recorded in the contingent consideration, loss accrual for service contracts, and other current liabilities financial statement line item, and was comprised of the following unobservable inputs as of March 31, 2024:

Financial Instrument	Fair Value		Valuation Technique	Unobservable Input	Range (weighted average)
Contingent consideration	$	106,326	Scenario based method	Credit spread	13.61% - 14.04%
				Discount rate	17.98% - 19.06%
		106,326

In the unaudited interim condensed consolidated balance sheets, contingent consideration is recorded in the contingent consideration, loss accrual for service contracts, and other current liabilities financial statement line item, and was comprised of the following unobservable inputs as of December 31, 2023:

Financial Instrument	Fair Value		Valuation Technique	Unobservable Input	Range (weighted average)
Contingent consideration	$	126,216	Scenario based method	Credit spread	13.61%
				Discount rate	17.71% - 19.06%
		126,216

The change in the carrying amount of Level 3 liabilities during the three months ended March 31, 2024 was as follows (in thousands):

	Three months ended
	March 31, 2024
Beginning balance as of December 31, 2023	$	126,216
Cash payments		(10,000)
Fair value adjustments		(9,200)
Foreign currency translation adjustment		(690)
Ending balance as of March 31, 2024	$	106,326

XML

Investments

3 Months Ended

Mar. 31, 2024

Investments

Investments

15. Investments

Equity Method Investments

As of March 31, 2024 and December 31, 2023, the Company accounted for the following investments in the investee’s common stock under the equity method, which are included in the investments in non-consolidated entities and non-marketable equity securities on the unaudited interim condensed consolidated balance sheets (amounts in thousands):

		As of March 31, 2024			As of December 31, 2023
	Formation	Common Stock	Carrying		Common Stock	Carrying
Investee	Date	Ownership %	Value		Ownership %	Value
HyVia	Q2 2021	50%	$	1,402	50%	$	(2,068)
AccionaPlug	Q4 2021	50%		4,371	50%		3,198
Clean H2 Infra Fund	Q4 2021	5%		17,428	5%		13,357
SK Plug Hyverse	Q1 2022	49%		37,871	49%		41,609
			$	61,072		$	56,096

As of December 31, 2023, the Company’s investment in HyVia was negative due to historical losses. The Company is committed to fund its share of losses of the joint venture and, therefore, continued to record losses as incurred. The negative equity investment as of December 31, 2023 was recorded on the unaudited interim condensed consolidated balance sheet to the contingent consideration, loss accrual for service contracts, and other liabilities financial statement line item.

During the three months ended March 31, 2024, the Company contributed approximately $16.2 million, $1.7 million, $0 and $4.0 million, respectively, to HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund. During the three months ended March 31, 2023, the Company contributed approximately $22.3 million, $0, $17.8 million and $0, respectively, to HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund.

The Company’s capital commitments related to its equity method investments as of March 31, 2024 includes $98.1 million to be made during the remainder of 2024.

XML

Operating and Finance Lease Liabilities

3 Months Ended

Mar. 31, 2024

Operating and Finance Lease Liabilities

Operating and Finance Lease Liabilities

16. Operating and Finance Lease Liabilities

As of March 31, 2024, the Company had operating leases, as lessee, primarily associated with sale/leaseback transactions that are partially secured by restricted cash and security deposits (see also Note 18, “Commitments and Contingencies”) as summarized below. These leases expire over the next one to seven years. Minimum rent payments under operating leases are recognized on a straight-line basis over the term of the lease.

Leases contain termination clauses with associated penalties, the amount of which cause the likelihood of cancellation to be remote. At the end of the lease term, the leased assets may be returned to the lessor by the Company, the Company may negotiate with the lessor to purchase the assets at fair market value, or the Company may negotiate with the lessor to renew the lease at market rental rates. No residual value guarantees are contained in the leases. No financial covenants are contained within the lease; however, the lease contains customary operational covenants such as the requirement that the Company properly maintain the leased assets and carry appropriate insurance. The leases include

credit support in the form of either cash, collateral or letters of credit. See Note 18, “Commitments and Contingencies”, for a description of cash held as security associated with the leases.

The Company has finance leases associated with its property and equipment in Latham, New York and at fueling customer locations.

Future minimum lease payments under operating and finance leases (with initial or remaining lease terms in excess of one year) as of March 31, 2024 were as follows (in thousands):

			Finance		Total
	Operating Lease		Lease		Lease
	Liability		Liability		Liabilities
Remainder of 2024	$	74,684	$	9,089	$	83,773
2025		94,822		15,030		109,852
2026		85,950		12,172		98,122
2027		72,561		8,482		81,043
2028		50,427		1,896		52,323
2029 and thereafter		147,725		3,243		150,968
Total future minimum payments		526,169		49,912		576,081
Less imputed interest		(182,699)		(6,637)		(189,336)
Total	$	343,470	$	43,275	$	386,745

Rental expense for all operating leases was $26.3 million and $21.9 million for the three months ended March 31, 2024 and 2023, respectively.

At both March 31, 2024 and December 31, 2023, security deposits associated with sale/leaseback transactions were $7.4 million, and were included in other assets in the unaudited interim condensed consolidated balance sheets.

Other information related to the operating leases are presented in the following table:

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments - operating cash flows (in thousands)	$	24,960	$	21,648
Weighted average remaining lease term (years)		7.21		2.66
Weighted average discount rate		11.5%		11.3%

Finance lease costs include amortization of the right of use assets (i.e., depreciation expense) and interest on lease liabilities (i.e., interest and other expense, net in the unaudited interim condensed consolidated statement of operations), and were $1.9 million and $1.1 million for the three months ended March 31, 2024, and 2023, respectively.

At March 31, 2024 and December 31, 2023, the right of use assets associated with finance leases, net was $56.1 million and $57.3 million, respectively. The accumulated depreciation for these right of use assets was $10.1 million and $9.0 million at March 31, 2024 and December 31, 2023, respectively.

Other information related to the finance leases are presented in the following table:

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments - operating cash flows (in thousands)	$	764	$	766
Cash payments - financing cash flows (in thousands)	$	2,272	$	2,059
Weighted average remaining lease term (years)		3.66		3.78
Weighted average discount rate		6.8%		6.7%

XML

Finance Obligation

3 Months Ended

Mar. 31, 2024

Finance Obligation

Finance Obligation

17. Finance Obligation

The Company has sold future services to be performed associated with certain sale/leaseback transactions and recorded the balance as a finance obligation. The outstanding balance of this obligation at March 31, 2024 was $333.0 million, $75.7 million and $257.3 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The outstanding balance of this obligation at December 31, 2023 was $350.8 million, $74.0 million and $276.8 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The amount is amortized using the effective interest method. Interest expense recorded related to finance obligations for the three months ended March 31, 2024 and 2023 was $10.0 million and $9.2 million, respectively.

In prior periods, the Company entered into sale/leaseback transactions that were accounted for as financing transactions and reported as part of finance obligations. The outstanding balance of finance obligations related to sale/leaseback transactions at March 31, 2024 was $16.8 million, $9.5 million and $7.3 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet. The outstanding balance of this obligation at December 31, 2023 was $17.6 million, $10.0 million and $7.6 million of which was classified as short-term and long-term, respectively, on the unaudited interim condensed consolidated balance sheet.

Future minimum payments under finance obligations notes above as of March 31, 2024 were as follows (in thousands):

					Total
	Sale of Future		Sale/Leaseback		Finance
	Revenue - Debt		Financings		Obligations
Remainder of 2024	$	82,353	$	9,924	$	92,277
2025		104,547		2,229		106,776
2026		87,824		2,229		90,053
2027		71,253		2,229		73,482
2028		51,188		2,015		53,203
2029 and thereafter		25,503		1,131		26,634
Total future minimum payments		422,668		19,757		442,425
Less imputed interest		(89,647)		(2,993)		(92,640)
Total	$	333,021	$	16,764	$	349,785

Other information related to the above finance obligations are presented in the following table:

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments (in thousands)	$	28,660	$	24,311
Weighted average remaining term (years)		4.27		4.76
Weighted average discount rate		11.3%		11.2%

The fair value of the Company’s total finance obligations approximated their carrying value as of March 31, 2024 and December 31, 2023.

XML

Commitments and Contingencies

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies

Commitments and Contingencies

18. Commitments and Contingencies

Restricted Cash

In connection with certain of the above noted sale/leaseback agreements, cash of $552.8 million and $573.5 million was required to be restricted as security as of March 31, 2024 and December 31, 2023, respectively, which restricted cash will be released over the lease term. As of March 31, 2024 and December 31, 2023, the Company also had certain letters of credit backed by security deposits totaling $351.8 million and $370.7 million, respectively, of which $321.0 million and $340.0 million are security for the above noted sale/leaseback agreements, respectively, and $30.8 million and $30.7 million are customs related letters of credit, respectively.

As of March 31, 2024 and December 31, 2023, the Company had $76.9 million and $76.8 million held in escrow related to the construction of certain hydrogen production plants, respectively.

The Company also had $1.2 million and $0.2 million of consideration held by our paying agent in connection with each of the Joule and CIS acquisitions, respectively, reported as restricted cash as of March 31, 2024, with a corresponding accrued liability on the Company’s unaudited interim condensed consolidated balance sheet. Additionally, the Company had $12.3 million and $11.7 million in restricted cash as collateral resulting from the Frames acquisition as of March 31, 2024 and December 31, 2023, respectively.

Litigation

Legal matters are defended and handled in the ordinary course of business. The outcome of any such matters, regardless of the merits, is inherently uncertain; therefore, assessing the likelihood of loss and any estimated damages is difficult and subject to considerable judgment. We describe below those legal matters for which a material loss is either (i) possible but not probable, and/or (ii) not reasonably estimable at this time. Liabilities for loss contingencies arising from claims, assessments, litigation, fines, and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred. The Company has not recorded any accruals related to any legal matters.

Securities Litigation and Related Stockholder Derivative Litigation

2021 Securities Action and Related Derivative Litigation

Two actions are pending in which alleged stockholders of the Company assert claims derivatively, on the Company’s behalf, based on allegations and claims that had been asserted in a putative securities class action, In re Plug Power, Inc. Securities Litigation, No. 1:21-cv-2004 (S.D.N.Y. (the “2021 Securities Action”). In an opinion and order entered in August 2023, the district court dismissed the 2021 Securities Action with prejudice, and the plaintiffs in that action did not appeal.

A consolidated stockholder derivative action relating to the claims and allegations in the 2021 Securities Action is pending in the Court of Chancery for the State of Delaware, styled In re Plug Power Inc. Stockholder Derivative

Litigation, Cons. C.A. No. 2022-0569-KSJM (Del. Ch.). By stipulation and order, the consolidated action was stayed until motions to dismiss were finally resolved in the 2021 Securities Action. On March 8, 2024, the alleged stockholder plaintiffs filed a consolidated amended complaint in which claims have been asserted against our officers Andrew J. Marsh, Paul B. Middleton, Gerard L. Conway, Jr., and Keith Schmid, and against our current or former directors George C. McNamee, Gary K. Willis, Maureen O. Helmer, Johannes M. Roth, Gregory L. Kenausis, Lucas Schneider, and Jonathan Silver. The Company is named as nominal defendant. Based on allegations in the first and second amended complaints in the 2021 Securities Action, the plaintiffs assert claims against the individual defendants for alleged breaches of fiduciary duty, disgorgement, and unjust enrichment based on alleged transactions in the Company’s securities while allegedly in possession of material non-public information concerning (i) the Company’s financial accounting prior to the announcement that the Company would need to restate certain financial statements and (ii) the potential amendment and termination of a warrant agreement between the Company and a significant customer. Defendants’ responses to the complaint are due by May 10, 2024.

On May 13, 2021, alleged stockholder Romario St. Clair filed a complaint in the Supreme Court of the State of New York, County of New York, asserting claims derivatively on behalf of the Company against certain current or former directors and officers of the Company. The action is styled St. Clair v. Plug Power Inc. et al., Index No. 653167/2021 (N.Y. Sup. Ct., N.Y. Cty.). By stipulation and order, the action was stayed until motions to dismiss were finally resolved in the 2021 Securities Action. On March 25, 2024, the alleged stockholder plaintiff filed an amended complaint in which claims have been asserted against Mr. Marsh, Mr. Middleton, Mr. McNamee, Mr. Willis, Ms. Helmer, Mr. Kenausis, Mr. Roth, Mr. Schneider, and Mr. Silver, with the Company named as nominal defendant. As had been alleged in the 2021 Securities Action, the amended complaint alleges that the individual defendants knew or consciously disregarded that the Company was experiencing known but undisclosed material weaknesses in its internal controls over financial reporting and had made certain accounting errors later corrected in the Company’s financial restatement in 2021. The complaint further alleges that Mr. Marsh and Mr. Middleton engaged in transactions in the Company’s securities before these issues were disclosed. The plaintiff asserts claims against the individual defendants, derivatively on behalf of the Company, for breach of fiduciary and unjust enrichment. Defendants’ responses to the amended complaint are due by May 21, 2024.

2023 Securities Action and Related Derivative Litigation

A consolidated action is pending in the United States District Court for the District of Delaware asserting claims under the federal securities laws against the Company and certain of its senior officers on behalf of a putative class of purchasers of the Company’s securities, styled In re Plug Power, Inc. Securities Litigation, No. 1:23-cv-00576-MN (the “2023 Securities Action”). The plaintiffs filed a consolidated complaint on September 28, 2023, in which they assert claims under the federal securities laws against the Company and four of its senior officers, Mr. Marsh, Mr. Middleton, Sanjay Shrestha, and former officer David Mindnich, on behalf of a putative class of purchasers of Plug Power common stock between January 19, 2022 and March 1, 2023. The complaint alleges that the defendants made “materially false and/or misleading statements” about the Company’s business and operations, including that “the Company was unable to effectively manage its supply chain and product manufacturing, resulting in reduced revenues and margins, increased inventory levels, and several large deals being delayed until at least 2023, among other issues The defendants filed a motion to dismiss the complaint on December 14, 2023, and briefing was completed in March 2024. All proceedings are stayed pending resolution of the motion to dismiss.

Beginning on September 13, 2023, three separate actions were filed in the U.S. District Court for the District of Delaware and in the U.S. District Court for the Southern District of New York asserting claims derivatively and on behalf of the Company against certain former and current Company officers and directors based on the claims asserted in the 2023 Securities Action. Those cases have been consolidated in the District of Delaware under the caption In re Plug Power, Inc. Stockholder Deriv. Litig., No. 1:23-cv-01007-MN (D. Del.). The defendants named in the constituent complaint were Mr. Marsh, Mr. Middleton, Mr. Mindnich, Martin Hull, Ms. Helmer, Mr. Kenausis, Mr. McNamee, Mr. Schneider, Mr. Silver, Mr. Willis, and current or former directors Jean Bua, Kavita Mahtani, and Kyungyeol Song. In an order entered on April 26, 2024, the Court approved the parties’ stipulation to stay all proceedings until motions to dismiss have been resolved in the 2023 Securities Action.

2024 Securities Litigation

On March 22, 2024, Ete Adote filed a complaint in the United States District Court for the Northern District of New York asserting claims under the federal securities laws against the Company, Mr. Marsh, and Mr. Middleton, on behalf of an alleged class of purchasers of Plug common stock between May 9, 2023 and January 16, 2024, styled Adote v. Plug Power, Inc. et al., No. 1:24-cv-00406-MAD-DJS (N.D.N.Y.). The allegations in the 2024 Securities Action are substantially similar to those in the consolidated 2023 Securities Action but cover a different putative class period that extends into 2024. On April 30, 2024, a second complaint asserting substantially similar claims against the same defendants, but on behalf of a putative class of purchasers of Plug Power common stock between March 1, 2023 and January 16, 2024, was filed in the Northern District of New York, styled Lee v. Plug Power, et al., No. 1:24;cv-0598-MAD-DJS (N.D.N.Y.).

Other Litigation

On May 2, 2023, a lawsuit entitled Jacob Thomas and JTurbo Engineering & Technology, LLC v. Joule Processing, LLC and Plug Power Inc., Case No. 4:23-cv-01615, was filed in the United States District Court for the Southern District of Texas against Joule Processing, LLC and Plug Power Inc. The complaint alleges misappropriation of trade secrets under both the federal Defend Trade Secrets Act of 2016, 18 U.S.C. § 1836, and the Texas Uniform Trade Secrets Act, three breach of contract claims, and four common law claims under Texas law. On December 5, 2023, the Court granted, in part, the partial motion to dismiss filed by Joule Processing, LLC and Plug Power Inc., and the Court dismissed with prejudice one of the breach of contract claims and the four common law claims. The Court also transferred another of the breach of contract claims to the United States District Court for the Northern District of New York, Case No. 1:23-cv-01528. That claim was dismissed without prejudice, and that matter was closed on April 4, 2024. Currently pending before the United States District Court for the Southern District of Texas is Plaintiff[s’] Verified Amended Application for Temporary Restraining Order, Preliminary Injunction and Permanent Injunctive Relief (the “Amended Application for Injunctive Relief”). Joule Processing, LLC and Plug Power Inc. filed their Response in Opposition to the Amended Application for Injunctive Relief on March 27, 2024, and Jacob Thomas and JTurbo Engineering & Technology, LLC filed their Reply in Support of the Amended Application for Injunctive Relief on April 4, 2024.

On May 10, 2023, an action entitled Ringling v. Plug Power, Inc., et al, Case No. 1:23-cv-572, was filed in the U.S. District Court for the Northern District of New York asserting claims pursuant to 42 U.S.C. § 1981, Title VII of the Civil Rights Act of 1964, and the New York State Human Rights Law against the Company, Tom Rourke, individually, and/or Tom O’Grady, individually. The complaint asserts that the plaintiff is seeking damages to redress injuries suffered as a result of harassment and discrimination on the basis of his race, together with creating a hostile work environment, failure to promote, retaliation, and constructive discharge. The parties entered into a settlement agreement and filed a stipulation of dismissal.

On July 24, 2023, an action entitled Felton v. Plug Power, Inc., Case No. 1:23-cv-887, was filed in the U.S. District Court for the Northern District of New York asserting claims against the Company pursuant to the New York State Human Rights Law. The complaint asserts that the plaintiff is seeking damages to redress injuries suffered as a result of harassment and discrimination on the basis of his race, together with creating a hostile work environment, and retaliation. Plug disagrees with plaintiff’s representations about his time at Plug and intends to vigorously defend against his allegations. Plaintiff’s counsel moved to withdraw from the case, which the court approved on March 18, 2024, and therefore plaintiff is now pro se.

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to credit risk consist principally of cash, cash equivalents, restricted cash and accounts receivable. Cash and restricted cash are maintained in accounts with financial institutions, which, at times may exceed the Federal depository insurance coverage of $250 thousand. The Company has not experienced losses on these accounts and management believes, based upon the quality of the financial institutions, that the credit risk with regard to these deposits is not significant.

Concentrations of credit risk with respect to receivables exist due to the limited number of select customers with whom the Company has commercial sales arrangements. To mitigate credit risk, the Company performs appropriate evaluation of a prospective customer’s financial condition.

At March 31, 2024, three customers comprised approximately 30.3% of the Company’s consolidated accounts receivable balance. At December 31, 2023, one customer comprised approximately 21.5% of the Company’s consolidated accounts receivable balance.

For purposes of assigning a customer to a sale/leaseback transaction completed with a financial institution, the Company considers the end user of the assets to be the ultimate customer. For the three months ended March 31, 2024, two customers accounted for 44.2% of total consolidated revenues. For the three months ended March 31, 2023, two customers accounted for 25.5% of total consolidated revenues.

Guarantee

On May 30, 2023, our joint venture, HyVia, entered into a government grant agreement with Bpifrance. As part of the agreement, our wholly-owned subsidiary, Plug Power France, was required to issue a guarantee to Bpifrance in the amount of €20 million through the end of January 2027. Plug Power France is liable to the extent of the guarantee for sums due to Bpifrance from HyVia under the agreement based on the difference between the total amount paid by Bpifrance and the final amount certified by HyVia and Bpifrance. As part of the agreement, there are certain milestones that HyVia is required to meet, and the nonperformance of these milestones or termination of this agreement could result in this guarantee being called upon. As of March 31, 2024, no payments related to this guarantee have been made by the Company and Plug Power France did not record a liability for this guarantee as the likelihood of the guarantee being called upon is remote.

Unconditional Purchase Obligations

The Company has entered into certain off–balance sheet commitments that require the future purchase of goods or services (“unconditional purchase obligations”). The Company’s unconditional purchase obligations primarily consist of supplier arrangements, take or pay contracts and service agreements. For certain vendors, the Company’s unconditional obligation to purchase a minimum quantity of raw materials at an agreed upon price is fixed and determinable; while certain other raw material costs will vary due to product forecasting and future economic conditions.

Future payments under non-cancelable unconditional purchase obligations with a remaining term in excess of one year as of March 31, 2024, were as follows (in thousands):

Remainder of 2024	$	37,742
2025		8,023
2026		8,023
2027		2,638
2028		—
2029 and thereafter		—
Total		56,426

XML

Employee Benefit Plans

3 Months Ended

Mar. 31, 2024

Employee Benefit Plans

Employee Benefit Plans

19. Employee Benefit Plans

2011 and 2021 Stock Option and Incentive Plan

The Company has issued stock-based awards to employees and members of its Board of Directors (the “Board”) consisting of stock options and restricted stock and restricted stock unit awards. The Company accounts for all stock-based awards to employees and members of the Board as compensation costs in the consolidated financial statements based on their fair values measured as of the date of grant. These costs are recognized over the requisite service period. Stock-based compensation costs recognized, excluding the Company’s matching contributions of $3.2 million to the Plug Power Inc.

401(k) Savings & Retirement Plan and quarterly Board compensation, were $10.4 million and $40.2 million for the three months ended March 31, 2024 and 2023, respectively. The methods and assumptions used in the determination of the fair value of stock-based awards are consistent with those described in our 2023 Form 10-K.

The components and classification of stock-based compensation expense, excluding the Company’s matching contributions to the Plug Power Inc. 401(k) Savings & Retirement Plan and quarterly Board compensation, were as follows (in thousands):

	Three months ended
	March 31, 2024		March 31, 2023
Cost of sales	$	2,006	$	2,677
Research and development		2,342		2,283
Selling, general and administrative		6,023		35,221
	$	10,371	$	40,181

Option Awards

The Company issues options that are time and performance-based awards. All option awards are determined to be classified as equity awards.

Service Stock Options Awards

The following table reflects the service stock option activity for the three months ended March 31, 2024:

				Weighted
		Weighted		Average
		Average		Remaining		Aggregate
		Exercise		Contractual		Intrinsic
	Shares	Price		Terms		Value
Options outstanding at December 31, 2023	17,336,362	$	11.37		7.86	$	11,391
Options exercisable at December 31, 2023	8,288,944		11.84		6.18		7,250
Options unvested at December 31, 2023	9,047,418		10.94		9.39		4,141
Granted	313,000		3.28		—		—
Exercised	(20,000)		2.10		—		—
Forfeited	(920,300)		19.42		—		—
Options outstanding at March 31, 2024	16,709,062	$	10.79		7.60	$	3,858
Options exercisable at March 31, 2024	8,334,755		11.93		5.90		3,792
Options unvested at March 31, 2024	8,374,307	$	9.65		9.29	$	66

The weighted average grant date fair value of the service stock options granted during the three months ended March 31, 2024 and 2023 was $2.41 and $10.48, respectively. The total intrinsic fair value of service stock options exercised during the three months ended March 31, 2024 and 2023 was $30 thousand and $1.3 million, respectively. The total fair value of the service stock options that vested during the three months ended March 31, 2024 and 2023 was approximately $6.1 million and $7.5 million, respectively.

Compensation cost associated with service stock options represented approximately $6.9 million and $8.2 million of the total share-based payment expense recorded for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, there was approximately $40.7 million of unrecognized compensation cost related to service stock option awards to be recognized over the weighted average remaining period of 1.99 years.

Performance Stock Option Awards

The following table reflects the performance stock option award activity for the three months ended March 31, 2024. Solely for the purposes of this table, the number of performance options is based on participants earning the maximum number of performance options (i.e. 200% of the target number of performance options):

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Shares	Price		Terms	Value
Options outstanding at December 31, 2023	21,925,000	$	21.32	5.27	$	—
Options exercisable at December 31, 2023	2,782,000		26.9	4.7		—
Options unvested at December 31, 2023	19,143,000		20.50	5.35		—
Granted	—		—	—		—
Exercised	—		—	—		—
Forfeited	(2,250,000)		—	—		—
Options outstanding at March 31, 2024	19,675,000	$	21.44	4.95	$	—
Options exercisable at March 31, 2024	2,782,000		26.92	4.48		—
Options unvested at March 31, 2024	16,893,000	$	20.54	5.03	$	—

The weighted average grant-date fair value of the performance stock options granted during the three months ended March 31, 2024 and 2023 was $0, respectively. There were no performance stock options exercised during the three months ended March 31, 2024 or 2023. The total fair value of the performance stock options that vested was $0 during the three months ended March 31, 2024 and 2023, respectively.

Compensation cost associated with performance stock options represented approximately ($6.1) million and $17.4 million of the total share-based payment expense recorded for the three months ended March 31, 2024 and 2023, respectively. Compensation cost for the three months ended March 31, 2024 includes non-cash reversals due to forfeitures of unvested performance stock options of ($15.2) million during the period. The non-cash compensation expense reversals were offset by compensation costs of $9.1 million during the three months ended March 31, 2024. As of March 31, 2024, there was approximately $21.0 million of unrecognized compensation cost related to performance stock option awards to be recognized over the weighted average remaining period of 1.38 years.

As of March 31, 2024, there were 3,904,333 unvested performance stock options for which the employee requisite service period had not been rendered but were expected to vest. The aggregate intrinsic value of these unvested performance stock options was $0 as of March 31, 2024. The weighted average exercise price of these unvested performance stock options was $14.66 and the weighted average remaining contractual term was 5.54 years as of March 31, 2024.

Restricted Common Stock and Restricted Stock Unit Awards

The following table reflects the restricted stock and restricted stock unit activity for the three months ended March 31, 2024 (in thousands except share amounts):

		Weighted		Aggregate
		Average Grant Date		Intrinsic
	Shares	Fair Value		Value
Unvested restricted stock and restricted stock units at December 31, 2023	6,732,884	$	15.66	$	30,298
Granted	17,000		5.23		—
Vested	(230,675)		28.42		—
Forfeited	(604,353)		18.69		—
Unvested restricted stock and restricted stock units at March 31, 2024	5,914,856	$	14.82	$	20,347

The weighted average grant-date fair value of the restricted common stock and restricted stock unit awards granted during the three months ended March 31, 2024 and 2023 was $5.23 and $15.44, respectively. The total fair value of restricted shares of common stock and restricted stock unit awards that vested for the three months ended March 31, 2024 and 2023 was $6.6 million and $13.5 million, respectively.

Compensation cost associated with restricted common stock and restricted stock unit awards represented approximately $9.6 million and $14.6 million for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, there was $63.3 million of unrecognized compensation cost related to restricted stock and restricted common stock unit awards to be recognized over the weighted average period of 1.85 years.

Included in the total unvested restricted common stock and restricted stock units as of March 31, 2024, there were 375,000 restricted common stock units outstanding with a performance target. The Company recorded expense associated with the restricted common stock units with a performance target of $0.6 million for the three months ended March 31, 2024. As of March 31, 2024 there was $2.5 million of unrecognized compensation cost related to the restricted common stock units outstanding with a performance target to be recognized over the weighted average period of 2.33 years.

401(k) Savings & Retirement Plan

The Company issued 895,258 shares of common stock and 219,970 shares of common stock pursuant to the Plug Power Inc. 401(k) Savings & Retirement Plan during the three months ended March 31, 2024 and 2023, respectively.

The Company’s expense for this plan was approximately $3.2 million and $3.0 million for the three months ended March 31, 2024 and 2023, respectively.

Non-Employee Director Compensation

The Company granted 53,598 shares of common stock and 10,316 shares of common stock to non-employee directors as compensation for the three months ended March 31, 2024 and 2023, respectively. All common stock issued is fully vested at the time of issuance and is valued at fair value on the date of issuance. The Company’s share-based compensation expense in connection with non-employee director compensation was approximately $0.2 million and $0.1 million for the three months ended March 31, 2024 and 2023, respectively.

XML

Accrued Expenses

3 Months Ended

Mar. 31, 2024

Accrued Expenses

Accrued Expenses

20. Accrued Expenses

Accrued expenses at March 31, 2024 and December 31, 2023 consisted of (in thousands):

	March 31,		December 31,
	2024		2023
Accrued payroll and compensation related costs	$	24,193	$	32,584
Accrual for capital expenditures		48,072		83,781
Accrued accounts payable		63,435		64,767
Accrued sales and other taxes		17,738		17,207
Accrued interest		969		562
Accrued other		407		1,643
Total	$	154,814	$	200,544

XML

Segment and Geographic Area Reporting

3 Months Ended

Mar. 31, 2024

Segment and Geographic Area Reporting

Segment and Geographic Area Reporting

21. Segment and Geographic Area Reporting

Our organization is managed from a sales perspective based on “go-to-market” sales channels, emphasizing shared learning across end-user applications and common supplier/vendor relationships. These sales channels are structured to serve a range of customers for our products and services. As a result of this structure, we concluded that we have one operating and reportable segment — the design, development and sale of hydrogen products and solutions that help customers meet their business goals while decarbonizing their operations. Our chief executive officer was identified as the chief operating decision maker (CODM). All significant operating decisions made by management are largely based

upon the analysis of Plug Power Inc. on a total company basis, including assessments related to our incentive compensation plans.

The revenue and long-lived assets based on geographic location are as follows (in thousands):

	Revenues				Long-Lived Assets
	Three months ended				As of
	March 31, 2024		March 31, 2023		March 31, 2024		December 31, 2023
North America	$	105,914	$	161,807	$	1,904,277	$	1,881,315
Europe		8,571		40,153		108,869		122,489
Asia		5,074		3,255		—		—
Other		705		5,071		1,286		884
Total	$	120,264	$	210,286	$	2,014,432	$	2,004,688

XML

Related Party Transactions

3 Months Ended

Mar. 31, 2024

Related Party Transactions

Related Party Transactions

22. Related Party Transactions

HyVia

Our 50/50 joint venture, HyVia, manufactures and sells fuel cell powered electric light commercial vehicles (“FCE-LCVs”) and supplies hydrogen fuel and fueling stations to support the FCE-LCV market, in each case primarily in Europe. For the three months ended March 31, 2024 and 2023, we recognized related party total revenue of $3.1 million and $3.8 million, respectively. As of March 31, 2024 and December 31, 2023, we had related party outstanding accounts receivable of $2.8 million and $2.3 million, respectively.

SK Plug Hyverse

Our 49/51 joint venture, SK Plug Hyverse, aims to provide hydrogen fuel cell systems, hydrogen fueling stations, electrolyzers and clean hydrogen to the Korean and other selected Asian markets. For the three months ended March 31, 2024 and 2023, we recognized related party total revenue of $3.4 million and $0.2 million, respectively. As of March 31, 2024 and December 31, 2023, we had related party outstanding accounts receivable of $4.3 million and $1.7 million, respectively.

XML

Restructuring

3 Months Ended

Mar. 31, 2024

Restructuring

Restructuring

23. Restructuring

In February 2024, in a strategic move to enhance our financial performance and ensure long-term value creation in a competitive market, we approved a comprehensive initiative that encompasses a broad range of measures, including operational consolidation, strategic workforce adjustments, and various other cost-saving actions (the “Restructuring Plan”). These measures are aimed at increasing efficiency, improving scalability, and maintaining our leadership position in the renewable energy industry. We began executing the Restructuring Plan in February 2024 and expect the Restructuring Plan to be completed in the second half of 2024, subject to local law and consultation requirements.

The determination of when we accrue for involuntary termination benefits under restructuring plans depends on whether the termination benefits are provided under an ongoing benefit arrangement or under a one-time benefit arrangement. We account for involuntary termination benefits that are provided pursuant to one-time benefit arrangements in accordance with ASC 420, Exit or Disposal Cost Obligations (“ASC 420”) whereas involuntary termination benefits that are part of an ongoing written or substantive plan are accounted for in accordance with ASC 712, Nonretirement Postemployment Benefits. We accrue a liability for termination benefits under ASC 420 in the period in which the plan is communicated to the employees and the plan is not expected to change significantly. For ongoing benefit arrangements, inclusive of statutory requirements, we accrue a liability for termination benefits under ASC 712 when the existing situation or set of circumstances indicates that an obligation has been incurred, it is probable the benefits will be paid, and the amount can be reasonably estimated. The restructuring charges that have been incurred but not yet paid are recorded in accrued expenses and other current liabilities in our unaudited interim condensed consolidated balance sheets, as they are expected to be paid within the next twelve months.

During the three months ended March 31, 2024, we incurred $6.0 million in restructuring costs recorded as severance expenses of $5.2 million, and other restructuring costs of $0.8 million in the restructuring financial statement line item in the unaudited interim condensed consolidated statement of operations. We expect to incur another $1.1 million in restructuring costs in subsequent quarters, which are primarily related to severance expenses, and are expected to be incurred during the third quarter of 2024. The actual timing and amount of costs associated with these restructuring actions may differ from our current expectations and estimates and such differences may be material.

Severance expense recorded during the three months ended March 31, 2024 in accordance with ASC 420 was a result of the separation of full-time employees associated with the Restructuring Plan. As of March 31, 2024, $0.8 million of accrued severance-related costs were included in accrued expenses in our unaudited interim condensed consolidated balance sheets and are expected to be paid during the third quarter of 2024. Other costs are represented by (1) $0.2 million of legal and professional services costs, and (2) $0.6 million of other one-time employee termination benefits. As of March 31, 2024, $0.1 million of accrued other costs were included in accrued expenses in our unaudited interim condensed consolidated balance sheets and are expected to be paid during the third quarter of 2024.

XML

Subsequent Events

3 Months Ended

Mar. 31, 2024

Subsequent Events

Subsequent Events

24. Subsequent Events

Common Stock At Market Issuance Sales Agreement

From March 31, 2024 through the date of filing of the Quarterly Report on Form 10-Q, the Company sold 55,801,292 shares of common stock at a weighted-average sales price of $2.65 per share for gross proceeds of $147.8 million with related issuance costs of $2.6 million.

XML

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2024

Summary of Significant Accounting Policies

Principles of Consolidation

Principles of Consolidation

The unaudited interim condensed consolidated financial statements include the financial statements of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. In addition, we include our share of the results of our joint ventures with Renault SAS (“Renault”) named HyVia SAS, a French société par actions simplifiée (“HyVia”), AccionaPlug S.L. (“AccionaPlug”), and SK Plug Hyverse Co., Ltd. (“SK Plug Hyverse”), and our investment in Clean H2 Infra Fund, using the equity method based on our economic ownership interest and our ability to exercise significant influence over the operating and financial decisions of HyVia, AccionaPlug, SK Plug Hyverse and Clean H2 Infra Fund.

Interim Financial Statements

Interim Financial Statements

The accompanying unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, which consist solely of normal recurring adjustments, necessary to present fairly, in accordance with U.S. generally accepted accounting principles (“GAAP”), the financial position, results of operations and cash flows for all periods presented, have been made. The results of operations for the interim periods presented are not necessarily indicative of the results that may be expected for the full year.

Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “2023 Form 10-K”).

The information presented in the accompanying unaudited interim condensed consolidated balance sheets as of December 31, 2023 has been derived from the Company’s 2023 audited consolidated financial statements.

The unaudited interim condensed consolidated financial statements contained herein should be read in conjunction with our 2023 Form 10-K.

Reclassification

Reclassification

Certain prior year amounts in the unaudited interim condensed consolidated statements of cash flows have been reclassified to conform to the current year presentation. These reclassifications had no effect on the reported results of operations.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Recently Adopted Accounting Guidance

There have been no significant changes in our reported financial position or results of operations and cash flows resulting from the adoption of new accounting pronouncements.

Recent Accounting Guidance Not Yet Effective

All issued but not yet effective accounting and reporting standards as of March 31, 2024 are either not applicable to the Company or are not expected to have a material impact on the Company.

XML

Extended Maintenance Contracts (Tables)

3 Months Ended

Mar. 31, 2024

Extended Maintenance Contracts

Schedule of accrual for loss contracts

The following table shows the roll forward of balances in the accrual for loss contracts, including changes due to the provision for loss accrual, releases to service cost of sales, increase to loss accrual related to warrants, and foreign currency translation adjustment (in thousands):

	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Beginning balance	$	137,853	$	81,066
Provision for loss accrual		15,111		85,375
Releases to service cost of sales		(11,936)		(29,713)
Increase to loss accrual related to customer warrants		634		971
Foreign currency translation adjustment		(93)		154
Ending balance	$	141,569	$	137,853

XML

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2024

Earnings Per Share

Schedule of potential dilutive common shares

	At March 31,
	2024	2023
Stock options outstanding (1)	36,384,062	27,479,533
Restricted stock and restricted stock units outstanding (2)	5,914,856	5,888,013
Common stock warrants (3)	78,561,263	85,879,175
Convertible Senior Notes (4)	44,661,605	39,170,766
Number of dilutive potential shares of common stock	165,521,786	158,417,487

(1) During the three months ended March 31, 2024 and 2023, the Company granted options for 313,000 and 94,550 shares of common stock, respectively.

(2) During the three months ended March 31, 2024 and 2023, the Company granted 17,000 and 94,550 shares of restricted stock and restricted stock units, respectively.

(3) In August 2022, the Company issued a warrant to acquire up to 16,000,000 shares of the Company’s common stock as part of a transaction agreement with Amazon.com, Inc. (“Amazon”), subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had not been exercised as of March 31, 2024 and 2023, respectively.

In April 2017, the Company issued a warrant to acquire up to 55,286,696 shares of the Company’s common stock as part of a transaction agreement with Amazon, subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had been exercised with respect to 34,917,912 and 27,600,000 shares of the Company’s common stock as of March 31, 2024 and 2023, respectively.

In July 2017, the Company issued a warrant to acquire up to 55,286,696 shares of the Company’s common stock as part of a transaction agreement with Walmart, Inc. (“Walmart”), subject to certain vesting events, as described in Note 11, “Warrant Transaction Agreements”. The warrant had been exercised with respect to 13,094,217 shares of the Company’s common stock as of March 31, 2024 and 2023.

(4) In May 2020, the Company issued $212.5 million in aggregate principal amount of the 3.75% Convertible Senior Notes due 2025 (the “3.75% Convertible Senior Notes”) as described in Note 9, “Convertible Senior Notes”. There were no conversions of the 3.75% Convertible Senior Notes for the three months ended March 31, 2024 and 2023.

In March 2024, the Company exchanged $138.8 million in aggregate principal amount of the 3.75% Convertible Senior Notes for $140.4 million in aggregate principal amount of the 7.00% Convertible Senior Notes due 2026 (the “7.00% Convertible Senior Notes”) as described in Note 9, “Convertible Senior Notes”. There were no conversions of the 7.00% Convertible Senior Notes for the three months ended March 31, 2024 and 2023.

XML

Inventory (Tables)

3 Months Ended

Mar. 31, 2024

Inventory

Schedule of inventory

Inventory as of March 31, 2024 and December 31, 2023 consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Raw materials and supplies - production locations	$	543,196	$	564,818
Raw materials and supplies - customer locations		31,142		20,751
Work-in-process		156,146		149,574
Finished goods		245,414		226,110
Inventory	$	975,898	$	961,253

XML

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2024

Property, Plant and Equipment

Schedule of Property plant and equipment

Property, plant and equipment at March 31, 2024 and December 31, 2023 consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Land	$	5,951	$	6,049
Construction in progress		852,555		1,109,896
Hydrogen production plants		351,390		77,107
Building and leasehold improvements		96,850		95,229
Software, machinery, and equipment		243,198		229,352
Property, plant and equipment		1,549,944		1,517,633
Less: accumulated depreciation		(95,953)		(81,456)
Property, plant and equipment, net	$	1,453,991	$	1,436,177

XML

Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2024

Intangible Assets

Schedule of Intangible assets

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of March 31, 2024 were as follows (in thousands):

	Weighted Average	Gross Carrying		Accumulated
	Amortization Period	Amount		Amortization		Total
Acquired technology	14 years	$	102,880	$	(21,979)	$	80,901
Dry stack electrolyzer technology	10 years		29,000		(6,042)		22,958
Customer relationships, trade name and other	13 years		103,002		(23,536)		79,466
		$	234,882	$	(51,557)	$	183,325

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2023 were as follows (in thousands):

	Weighted Average	Gross Carrying		Accumulated
	Amortization Period	Amount		Amortization		Total
Acquired technology	14 years	$	103,060	$	(20,204)	$	82,856
Dry stack electrolyzer technology	10 years		29,000		(5,317)		23,683
Customer relationships, trade name and other	13 years		103,981		(21,634)		82,347
		$	236,041	$	(47,155)	$	188,886

Schedule of future amortization of intangible assets

The estimated amortization expense for subsequent years is as follows (in thousands):

Remainder of 2024	$	14,132
2025		18,070
2026		16,487
2027		16,480
2028		16,071
2029 and thereafter		102,085
Total	$	183,325

XML

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2024

Long-Term Debt

Schedule of long term debt

As of March 31, 2024, the principal balance is due at each of the following dates as follows (in thousands):

December 31, 2024		3,057
December 31, 2025		1,200
December 31, 2026		900
Total outstanding principal	$	5,157

XML

Convertible Senior Notes (Tables)

3 Months Ended

Mar. 31, 2024

3.75% Convertible Senior Notes

Debt Instrument [Line Items]

Schedule of Convertible Senior Notes

The 3.75% Convertible Senior Notes consisted of the following (in thousands):

	March 31,		December 31,
	2024		2023
Principal amounts:
Principal	$	58,462	$	197,278
Unamortized debt issuance costs (1)		(496)		(2,014)
Net carrying amount	$	57,966	$	195,264

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

Schedule of debt

The following table summarizes the total interest expense and effective interest rate related to the 3.75% Convertible Senior Notes for the three months ended March 31, 2024 and 2023 (in thousands, except for the effective interest rate):

	March 31,			March 31,
	2024			2023
Interest expense	$	1,690	$	1,849
Amortization of debt issuance costs		316		331
Total	$	2,006	$	2,180
Effective interest rate		4.5%		4.5%

7.0% Convertible Senior Note

Debt Instrument [Line Items]

Schedule of Convertible Senior Notes

The 7.00% Convertible Senior Notes consisted of the following (in thousands):

	March 31,
	2024
Principal amounts:
Principal	$	140,396
Unamortized debt premium, net of offering costs (1)		11,440
Net carrying amount	$	151,836

(1) Included in the unaudited interim condensed consolidated balance sheets within convertible senior notes, net and amortized over the remaining life of the notes using the effective interest rate method.

Schedule of debt

The following table summarizes the total interest expense and effective interest rate related to the 7.00% Convertible Senior Notes for the three months ended March 31, 2024 (in thousands, except for the effective interest rate):

	March 31,
	2024
Interest expense	$	296
Amortization of premium		(159)
Total	$	137
Effective interest rate		3.0%

XML

Warrant Transaction Agreements (Tables)

3 Months Ended

Mar. 31, 2024

2022 Amazon transaction agreement

Schedule of Fair Value Assumption of Warrants

	Tranches 1-3	Tranche 4
	August 24, 2022	March 31, 2024
Risk-free interest rate	3.15%	4.12%
Volatility	75.00%	90.00%
Expected average term (years)	7.00	4.00
Exercise price	$22.98	$3.10
Stock price	$20.36	$3.44

Warrants issued with the Walmart Stores, Inc transaction agreement

Schedule of Fair Value Assumption of Warrants

	Tranches 1-2	Tranche 3
	January 1, 2019	October 30, 2023
Risk-free interest rate	2.63%	4.73%
Volatility	95.00%	75.00%
Expected average term (years)	8.55	3.72
Exercise price	$2.12	$6.28
Stock price	$1.24	$5.70

XML

Revenue (Tables)

3 Months Ended

Mar. 31, 2024

Revenue

Schedule of disaggregation of revenue

The following table provides information about disaggregation of revenue (in thousands):

Major products/services lines	Three months ended
	March 31,
	2024		2023
Sales of fuel cell systems	$	19,003	$	28,852
Sales of hydrogen infrastructure		12,295		48,868
Sales of electrolyzers		1,351		40,032
Sales of engineered equipment		4,216		7,753
Services performed on fuel cell systems and related infrastructure		13,023		9,097
Power purchase agreements		18,304		7,937
Fuel delivered to customers and related equipment		18,286		10,142
Sales of cryogenic equipment and other		31,430		56,589
Other		2,356		1,016
Net revenue	$	120,264	$	210,286

Schedule of receivables, contract assets and contract liabilities from contracts with customers

The following table provides information about receivables, contract assets and deferred revenue and contract liabilities from contracts with customers (in thousands):

	March 31,		December 31,
	2024		2023
Accounts receivable	$	148,822	$	243,811
Contract assets		160,374		155,989
Deferred revenue and contract liabilities		255,802		288,302

Schedule of changes in contract assets and the contract liabilities

Significant changes in the contract assets and the deferred revenue and contract liabilities balances during the period are as follows (in thousands):

Contract assets	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Transferred to receivables from contract assets recognized at the beginning of the period	$	(9,082)	$	(94,860)
Change in contract assets related to warrants		5,850		14,260
Impairment		—		(2,375)
Revenue recognized and not billed as of the end of the period		7,617		134,677
Net change in contract assets	$	4,385	$	51,702

Deferred revenue and contract liabilities	Three months ended		Year ended
	March 31, 2024		December 31, 2023
Increases due to customer billings, net of amounts recognized as revenue during the period	$	12,057	$	151,965
Change in contract liabilities related to warrants		110		440
Revenue recognized that was included in the contract liability balance as of the beginning of the period		(44,667)		(94,001)
Net change in deferred revenue and contract liabilities	$	(32,500)	$	58,404

Schedule of Estimated future revenue

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period, including provision for common stock warrants (in thousands):

	March 31,		Expected recognition
	2024		period (years)
Sales of fuel cell systems	$	55,671		1 - 2
Sales of hydrogen installations and other infrastructure		31,039		1
Sales of electrolyzers		303,127		1 - 2
Sales of engineered equipment		14,559		1
Services performed on fuel cell systems and related infrastructure		142,111		5 - 10
Power purchase agreements		419,406		5 - 10
Fuel delivered to customers and related equipment		93,685		5 - 10
Sales of cryogenic equipment and other		77,105		1
Total estimated future revenue	$	1,136,703

XML

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Measurements

Schedule of assets and liabilities measured at fair value on a recurring basis

Assets and liabilities measured at fair value on a recurring basis are summarized below (in thousands):

		As of March 31, 2024
		Carrying		Fair		Fair Value Measurements
		Amount		Value		Level 1		Level 2		Level 3
Liabilities
Contingent consideration	$	106,326	$	106,326	$	—	$	—	$	106,326

	As of December 31, 2023
	Carrying	Fair	Fair Value Measurements
	Amount	Value	Level 1	Level 2	Level 3
Liabilities
Contingent consideration	126,216	126,216	—	—	126,216

Schedule of assets and liabilities measured at fair value on a recurring basis that have unobservable inputs

Financial Instrument	Fair Value		Valuation Technique	Unobservable Input	Range (weighted average)
Contingent consideration	$	106,326	Scenario based method	Credit spread	13.61% - 14.04%
				Discount rate	17.98% - 19.06%
		106,326

In the unaudited interim condensed consolidated balance sheets, contingent consideration is recorded in the contingent consideration, loss accrual for service contracts, and other current liabilities financial statement line item, and was comprised of the following unobservable inputs as of December 31, 2023:

Financial Instrument	Fair Value		Valuation Technique	Unobservable Input	Range (weighted average)
Contingent consideration	$	126,216	Scenario based method	Credit spread	13.61%
				Discount rate	17.71% - 19.06%
		126,216

Schedule of activity in the level 3 liabilities

The change in the carrying amount of Level 3 liabilities during the three months ended March 31, 2024 was as follows (in thousands):

	Three months ended
	March 31, 2024
Beginning balance as of December 31, 2023	$	126,216
Cash payments		(10,000)
Fair value adjustments		(9,200)
Foreign currency translation adjustment		(690)
Ending balance as of March 31, 2024	$	106,326

XML

Investments (Tables)

3 Months Ended

Mar. 31, 2024

Investments

Summary of investments under the equity method

As of March 31, 2024 and December 31, 2023, the Company accounted for the following investments in the investee’s common stock under the equity method, which are included in the investments in non-consolidated entities and non-marketable equity securities on the unaudited interim condensed consolidated balance sheets (amounts in thousands):

		As of March 31, 2024			As of December 31, 2023
	Formation	Common Stock	Carrying		Common Stock	Carrying
Investee	Date	Ownership %	Value		Ownership %	Value
HyVia	Q2 2021	50%	$	1,402	50%	$	(2,068)
AccionaPlug	Q4 2021	50%		4,371	50%		3,198
Clean H2 Infra Fund	Q4 2021	5%		17,428	5%		13,357
SK Plug Hyverse	Q1 2022	49%		37,871	49%		41,609
			$	61,072		$	56,096

XML

Operating and Finance Lease Liabilities (Tables)

3 Months Ended

Mar. 31, 2024

Operating and Finance Lease Liabilities

Schedule of future minimum lease payments under operating leases

Future minimum lease payments under operating and finance leases (with initial or remaining lease terms in excess of one year) as of March 31, 2024 were as follows (in thousands):

			Finance		Total
	Operating Lease		Lease		Lease
	Liability		Liability		Liabilities
Remainder of 2024	$	74,684	$	9,089	$	83,773
2025		94,822		15,030		109,852
2026		85,950		12,172		98,122
2027		72,561		8,482		81,043
2028		50,427		1,896		52,323
2029 and thereafter		147,725		3,243		150,968
Total future minimum payments		526,169		49,912		576,081
Less imputed interest		(182,699)		(6,637)		(189,336)
Total	$	343,470	$	43,275	$	386,745

Schedule of future minimum lease payments under finance obligations

Future minimum lease payments under operating and finance leases (with initial or remaining lease terms in excess of one year) as of March 31, 2024 were as follows (in thousands):

			Finance		Total
	Operating Lease		Lease		Lease
	Liability		Liability		Liabilities
Remainder of 2024	$	74,684	$	9,089	$	83,773
2025		94,822		15,030		109,852
2026		85,950		12,172		98,122
2027		72,561		8,482		81,043
2028		50,427		1,896		52,323
2029 and thereafter		147,725		3,243		150,968
Total future minimum payments		526,169		49,912		576,081
Less imputed interest		(182,699)		(6,637)		(189,336)
Total	$	343,470	$	43,275	$	386,745

Schedule of operating leases other information

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments - operating cash flows (in thousands)	$	24,960	$	21,648
Weighted average remaining lease term (years)		7.21		2.66
Weighted average discount rate		11.5%		11.3%

Schedule of finance leases other information

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments - operating cash flows (in thousands)	$	764	$	766
Cash payments - financing cash flows (in thousands)	$	2,272	$	2,059
Weighted average remaining lease term (years)		3.66		3.78
Weighted average discount rate		6.8%		6.7%

XML

Finance Obligation (Tables)

3 Months Ended

Mar. 31, 2024

Finance Obligation

Schedule of future minimum payments under finance obligations

Future minimum payments under finance obligations notes above as of March 31, 2024 were as follows (in thousands):

					Total
	Sale of Future		Sale/Leaseback		Finance
	Revenue - Debt		Financings		Obligations
Remainder of 2024	$	82,353	$	9,924	$	92,277
2025		104,547		2,229		106,776
2026		87,824		2,229		90,053
2027		71,253		2,229		73,482
2028		51,188		2,015		53,203
2029 and thereafter		25,503		1,131		26,634
Total future minimum payments		422,668		19,757		442,425
Less imputed interest		(89,647)		(2,993)		(92,640)
Total	$	333,021	$	16,764	$	349,785

Schedule of finance obligation other information

	Three months ended		Three months ended
	March 31, 2024		March 31, 2023
Cash payments (in thousands)	$	28,660	$	24,311
Weighted average remaining term (years)		4.27		4.76
Weighted average discount rate		11.3%		11.2%

XML

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies

Schedule of unconditional purchase obligations

Remainder of 2024	$	37,742
2025		8,023
2026		8,023
2027		2,638
2028		—
2029 and thereafter		—
Total		56,426

XML

Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2024

Schedule of components and classification of stock-based compensation expense

The components and classification of stock-based compensation expense, excluding the Company’s matching contributions to the Plug Power Inc. 401(k) Savings & Retirement Plan and quarterly Board compensation, were as follows (in thousands):

	Three months ended
	March 31, 2024		March 31, 2023
Cost of sales	$	2,006	$	2,677
Research and development		2,342		2,283
Selling, general and administrative		6,023		35,221
	$	10,371	$	40,181

Nonvested Restricted Stock Shares Activity

The following table reflects the restricted stock and restricted stock unit activity for the three months ended March 31, 2024 (in thousands except share amounts):

		Weighted		Aggregate
		Average Grant Date		Intrinsic
	Shares	Fair Value		Value
Unvested restricted stock and restricted stock units at December 31, 2023	6,732,884	$	15.66	$	30,298
Granted	17,000		5.23		—
Vested	(230,675)		28.42		—
Forfeited	(604,353)		18.69		—
Unvested restricted stock and restricted stock units at March 31, 2024	5,914,856	$	14.82	$	20,347

Service Stock Options Awards

Schedule of Share-based Compensation, Stock Options, Activity

				Weighted
		Weighted		Average
		Average		Remaining		Aggregate
		Exercise		Contractual		Intrinsic
	Shares	Price		Terms		Value
Options outstanding at December 31, 2023	17,336,362	$	11.37		7.86	$	11,391
Options exercisable at December 31, 2023	8,288,944		11.84		6.18		7,250
Options unvested at December 31, 2023	9,047,418		10.94		9.39		4,141
Granted	313,000		3.28		—		—
Exercised	(20,000)		2.10		—		—
Forfeited	(920,300)		19.42		—		—
Options outstanding at March 31, 2024	16,709,062	$	10.79		7.60	$	3,858
Options exercisable at March 31, 2024	8,334,755		11.93		5.90		3,792
Options unvested at March 31, 2024	8,374,307	$	9.65		9.29	$	66

Performance Stock Option Awards

Schedule of Share-based Compensation, Stock Options, Activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Shares	Price		Terms	Value
Options outstanding at December 31, 2023	21,925,000	$	21.32	5.27	$	—
Options exercisable at December 31, 2023	2,782,000		26.9	4.7		—
Options unvested at December 31, 2023	19,143,000		20.50	5.35		—
Granted	—		—	—		—
Exercised	—		—	—		—
Forfeited	(2,250,000)		—	—		—
Options outstanding at March 31, 2024	19,675,000	$	21.44	4.95	$	—
Options exercisable at March 31, 2024	2,782,000		26.92	4.48		—
Options unvested at March 31, 2024	16,893,000	$	20.54	5.03	$	—

XML

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2024

Accrued Expenses

Schedule of Accrued Expenses

Accrued expenses at March 31, 2024 and December 31, 2023 consisted of (in thousands):

	March 31,		December 31,
	2024		2023
Accrued payroll and compensation related costs	$	24,193	$	32,584
Accrual for capital expenditures		48,072		83,781
Accrued accounts payable		63,435		64,767
Accrued sales and other taxes		17,738		17,207
Accrued interest		969		562
Accrued other		407		1,643
Total	$	154,814	$	200,544

XML

Segment and Geographic Area Reporting (Tables)

3 Months Ended

Mar. 31, 2024

Segment and Geographic Area Reporting

Schedule of revenue from external customers and long-lived assets, by geographical areas

The revenue and long-lived assets based on geographic location are as follows (in thousands):

	Revenues				Long-Lived Assets
	Three months ended				As of
	March 31, 2024		March 31, 2023		March 31, 2024		December 31, 2023
North America	$	105,914	$	161,807	$	1,904,277	$	1,881,315
Europe		8,571		40,153		108,869		122,489
Asia		5,074		3,255		—		—
Other		705		5,071		1,286		884
Total	$	120,264	$	210,286	$	2,014,432	$	2,004,688

XML

Nature of Operations - Liquidity, Capital Resources and Going Concern (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended	4 Months Ended
	Feb. 23, 2024	Jan. 17, 2024	May 10, 2024	Mar. 31, 2024	May 10, 2024	Jun. 01, 2024
Liquidity and Capital Resources
Working Capital				$ 855,100
Unrestricted cash				172,900
Restricted cash				1,000,000
Gross proceeds				305,346
Aggregate offering price				$ 305,346
At Market Issuance Sales Agreement
Liquidity and Capital Resources
Number of common stock sold				79,553,175	135,354,467
Sales price per share			$ 3.38	$ 3.89	$ 3.38
Gross proceeds				$ 309,300	$ 457,100
Stock issuance cost				$ 3,900	$ 6,500
Remaining authorized for issuance	$ 697,900
Common stock reserved for future issuance	$ 1,000,000
Period of ATM Agreement	18 months
Maximum commitment advance purchase amount	$ 11,000
Maximum commitment advance purchase amount cap	$ 55,000
At Market Issuance Sales Agreement | Subsequent event
Liquidity and Capital Resources
Number of common stock sold			55,801,292
Sales price per share			$ 2.65		$ 2.65
Gross proceeds			$ 147,800
Stock issuance cost			$ 2,600
At Market Issuance Sales Agreement | Subsequent event | If market capitalization is not less than $1.0 billion | R.Bailey
Liquidity and Capital Resources
Maximum commitment advance purchase amount						$ 11,000
Maximum commitment advance purchase amount cap						55,000
Market capitalization						1,000,000
At Market Issuance Sales Agreement | Subsequent event | If market capitalization is less Than $1.0 billion | R.Bailey
Liquidity and Capital Resources
Maximum commitment advance purchase amount						10,000
Maximum commitment advance purchase amount cap						30,000
Market capitalization						$ 1,000,000
Maximum | At Market Issuance Sales Agreement
Liquidity and Capital Resources
Aggregate offering price		$ 1,000,000

XML

Extended Maintenance Contracts (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Accrual for loss contracts
Beginning balance	$ 137,853	$ 81,066
Provision for loss accrual	15,111	85,375
Releases to service cost of sales	(11,936)	(29,713)
Increase to loss accrual related to customer warrants	634	971
Foreign currency translation adjustment	(93)	154
Ending balance	$ 141,569	$ 137,853

XML

Earnings Per Share - Dilutive Potential Common Shares (Details) - USD ($)		1 Months Ended	3 Months Ended
	Mar. 12, 2024	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 21, 2024	Mar. 20, 2024	Dec. 31, 2023	Aug. 24, 2022	May 31, 2020	May 29, 2020	May 18, 2020	Jul. 20, 2017	Apr. 04, 2017
Earnings Per Share
Number of dilutive potential common stock			165,521,786	158,417,487
Options granted			313,000	94,550
Interest rate (as a percent)		7.00%	7.00%
3.75% Convertible Senior Notes
Earnings Per Share
Principal amount		$ 58,462,000	$ 58,462,000		$ 58,500,000		$ 197,278,000		$ 212,500,000	$ 12,500,000	$ 200,000,000.0
Interest rate (as a percent)	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%			3.75%	3.75%	3.75%
Conversion of notes through common stock issuance (in shares)			0	0
Amount of debt converted	$ 138,800,000	$ 138,800,000
7.0% Convertible Senior Note
Earnings Per Share
Principal amount	$ 140,400,000	$ 140,396,000	$ 140,396,000			$ 140,400,000
Interest rate (as a percent)	7.00%	7.00%	7.00%			7.00%
Amount of debt converted			$ 0	$ 0
Restricted Stock
Earnings Per Share
Number of restricted shares granted during period			17,000
2022 Amazon transaction agreement
Earnings Per Share
Shares of common stock that can be purchased from warrants issued (in shares)								16,000,000
Number of warrants exercised to date		0	0	0
Warrants issued with the Amazon, Inc transaction agreement
Earnings Per Share
Shares of common stock that can be purchased from warrants issued (in shares)													55,286,696
Number of warrants exercised to date		34,917,912	34,917,912	27,600,000
Warrants issued with the Walmart Stores, Inc transaction agreement
Earnings Per Share
Shares of common stock that can be purchased from warrants issued (in shares)												55,286,696
Number of warrants exercised to date		13,094,217	13,094,217	13,094,217
Employee Stock Option [Member]
Earnings Per Share
Number of dilutive potential common stock			36,384,062	27,479,533
Restricted Stock
Earnings Per Share
Number of dilutive potential common stock			5,914,856	5,888,013
Number of restricted shares granted during period			17,000	94,550
Common stock warrants
Earnings Per Share
Number of dilutive potential common stock			78,561,263	85,879,175
Convertible Senior Notes
Earnings Per Share
Number of dilutive potential common stock			44,661,605	39,170,766

XML

Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Inventory
Raw materials and supplies - production locations	$ 543,196	$ 564,818
Raw materials and supplies - customer locations	31,142	20,751
Work-in-process	156,146	149,574
Finished goods	245,414	226,110
Inventory	975,898	961,253
Reserve for excess and obsolete inventory	$ 117,700	$ 85,200

XML

Property, Plant and Equipment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) Plant	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Property, plant and equipment
Property, plant, and equipment	$ 1,549,944		$ 1,517,633
Less: accumulated depreciation	(95,953)		(81,456)
Property, plant, and equipment, net	$ 1,453,991		1,436,177
Number of hydrogen production plant | Plant	3
Capitalized interest	$ 2,100	$ 2,000
Depreciation expense	11,600	$ 5,500
Land
Property, plant and equipment
Property, plant, and equipment	5,951		6,049
Construction in progress
Property, plant and equipment
Property, plant, and equipment	852,555		1,109,896
Hydrogen production plants
Property, plant and equipment
Property, plant, and equipment	351,390		77,107
Building and leasehold improvements
Property, plant and equipment
Property, plant, and equipment	96,850		95,229
Software, machinery, and equipment
Property, plant and equipment
Property, plant, and equipment	$ 243,198		$ 229,352

XML

Intangible Assets - Gross Carrying Amount (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Gross Carrying Amount	$ 234,882	$ 236,041
Accumulated Amortization	(51,557)	(47,155)
Total	$ 183,325	$ 188,886
Acquired technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	14 years	14 years
Gross Carrying Amount	$ 102,880	$ 103,060
Accumulated Amortization	(21,979)	(20,204)
Total	$ 80,901	$ 82,856
Dry stack electrolyzer technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	10 years	10 years
Gross Carrying Amount	$ 29,000	$ 29,000
Accumulated Amortization	(6,042)	(5,317)
Total	$ 22,958	$ 23,683
Customer relationships, trade name and other
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	13 years	13 years
Gross Carrying Amount	$ 103,002	$ 103,981
Accumulated Amortization	(23,536)	(21,634)
Total	$ 79,466	$ 82,347

XML

Intangible Assets - Estimated Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Intangible Assets
Amortization of intangible assets	$ 4,400	$ 5,000
Estimated amortization expense
Remainder of 2024	14,132
2025	18,070
2026	16,487
2027	16,480
2028	16,071
2029 and thereafter	102,085
Total	$ 183,325		$ 188,886

XML

Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Long-Term Debt
Principal payments on long-term debt	$ 300	$ 330
Loss on extinguishment of debt	(14,047)
Outstanding balance	3,800
Carrying amount of debt	5,157
Unamortized debt discount	$ 1,400
Minimum
Long-Term Debt
Effective interest rate (as a percent)	7.30%
Maximum
Long-Term Debt
Effective interest rate (as a percent)	7.60%
Secured term loan facility | Loan and security agreement
Long-Term Debt
Secured term loan amount	$ 300

XML

Long-Term Debt - Principal Balance Due (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Principal payments of long term debt
December 31, 2024	$ 3,057
December 31, 2025	1,200
December 31, 2026	900
Total outstanding principal	$ 5,157

XML

Convertible Senior Notes - Narratives (Details)			1 Months Ended	3 Months Ended
	Mar. 20, 2024 USD ($) $ / shares shares	Mar. 12, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 USD ($) shares	Mar. 21, 2024 USD ($)	Dec. 31, 2023 USD ($)	May 31, 2020 USD ($)	May 29, 2020 USD ($)	May 20, 2020 USD ($)	May 18, 2020 USD ($)	Mar. 31, 2018 USD ($)
Convertible Senior Notes
Interest rate (as a percent)			7.00%	7.00%
Net proceeds					$ 27,927,000
Long-term borrowings			$ 3,800,000	$ 3,800,000
Carrying amount of the liability component			$ 5,157,000	5,157,000
Loss on extinguishment of debt				$ (14,047,000)
Minimum
Convertible Senior Notes
Effective interest rate (as a percent)			7.30%	7.30%
Maximum
Convertible Senior Notes
Effective interest rate (as a percent)			7.60%	7.60%
7.0% Convertible Senior Note
Convertible Senior Notes
Amount of debt converted				$ 0	$ 0
Principal amount	$ 140,400,000	$ 140,400,000	$ 140,396,000	$ 140,396,000
Interest rate (as a percent)	7.00%	7.00%	7.00%	7.00%
Premium (as a percent)	20.00%
Maturity principal amount	$ 1,000									$ 1,000
Conversion rates for the notes (in shares)	235.4049
Conversion price, per share | $ / shares	$ 4.25
Effective interest rate (as a percent)			3.00%	3.00%
Fair value of convertible senior notes			$ 153,200,000	$ 153,200,000
7.0% Convertible Senior Note | Minimum
Convertible Senior Notes
Redemption notice days	1 day
7.0% Convertible Senior Note | Maximum
Convertible Senior Notes
Redemption notice days	3 days
7.0% Convertible Senior Note | Holder may require redemption
Convertible Senior Notes
Debt Instrument, Redemption Price, Percentage	100.00%
7.0% Convertible Senior Note | Company may redeem with the consent of the holder
Convertible Senior Notes
Trading days	20
Consecutive trading days	30
Conversion price (as a percent)	130.00%
7.0% Convertible Senior Note | Under Certain Circumstances Resulting In Increase To Conversion Rate [Member] | Maximum
Convertible Senior Notes
Conversion of notes through common stock issuance (in shares) | shares	39,659,890
Conversion rates for the notes (in shares)	282.4859
3.75% Convertible Senior Notes
Convertible Senior Notes
Amount of debt converted		$ 138,800,000	138,800,000
Principal amount			$ 58,462,000	$ 58,462,000		$ 58,500,000	$ 197,278,000	$ 212,500,000	$ 12,500,000		$ 200,000,000.0
Accrued and unpaid interest	$ 1,600,000
Interest rate (as a percent)	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%		3.75%	3.75%		3.75%
Conversion of debt	$ 138,800,000
Conversion of notes through common stock issuance (in shares) | shares				0	0
Effective interest rate (as a percent)			4.50%	4.50%	4.50%
Loss on extinguishment of debt				$ (14,000,000.0)
Fair value of convertible senior notes			$ 60,400,000	$ 60,400,000
5.5% Convertible Senior Notes
Convertible Senior Notes
Principal amount												$ 100,000,000.0
Interest rate (as a percent)			5.50%	5.50%								5.50%

XML

Convertible Senior Notes - Components (Details) - USD ($)		1 Months Ended	3 Months Ended
	Mar. 12, 2024	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 21, 2024	Mar. 20, 2024	Dec. 31, 2023	May 31, 2020	May 29, 2020	May 18, 2020
Convertible Senior Notes
Unamortized debt discount		$ (1,400,000)	$ (1,400,000)
Net carrying amount		$ 209,802,000	$ 209,802,000				$ 195,264,000
Interest rate (as a percent)		7.00%	7.00%
3.75% Convertible Senior Notes
Convertible Senior Notes
Principal amount		$ 58,462,000	$ 58,462,000		$ 58,500,000		197,278,000	$ 212,500,000	$ 12,500,000	$ 200,000,000.0
Unamortized debt issuance costs		(496,000)	(496,000)				(2,014,000)
Net carrying amount		$ 57,966,000	$ 57,966,000				$ 195,264,000
Interest rate (as a percent)	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%		3.75%	3.75%	3.75%
Conversion of convertible senior notes to common stock	$ 138,800,000	$ 138,800,000
7.0% Convertible Senior Note
Convertible Senior Notes
Principal amount	$ 140,400,000	140,396,000	$ 140,396,000			$ 140,400,000
Unamortized debt premium, net of offering costs		11,440,000	11,440,000
Net carrying amount		$ 151,836,000	$ 151,836,000
Interest rate (as a percent)	7.00%	7.00%	7.00%			7.00%
Conversion of convertible senior notes to common stock			$ 0	$ 0

XML

Convertible Senior Notes - Expenses and Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
3.75% Convertible Senior Notes
Convertible Senior Notes
Interest expense	$ 1,690	$ 1,849
Amortization of debt issuance costs	316	331
Interest and Debt Expense, Total	$ 2,006	$ 2,180
Effective interest rate (as a percent)	4.50%	4.50%
7.0% Convertible Senior Note
Convertible Senior Notes
Interest expense	$ 296
Amortization of premium	(159)
Interest and Debt Expense, Total	$ 137
Effective interest rate (as a percent)	3.00%

XML

Convertible Senior Notes - Capped Call and Common Stock Forward (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended
	Mar. 12, 2024	May 18, 2020	Mar. 31, 2024	Mar. 31, 2018	Mar. 31, 2024	Mar. 31, 2023	Mar. 21, 2024	Mar. 20, 2024	Dec. 31, 2023	May 31, 2020	May 29, 2020
Capped Call and Common Stock Forward
Interest rate (as a percent)			7.00%		7.00%
Common Stock Forward
Capped Call and Common Stock Forward
Net cost incurred				$ 27,500
Number of shares settled					0	0
3.75% Convertible Senior Notes
Capped Call and Common Stock Forward
Principal amount		$ 200,000	$ 58,462		$ 58,462		$ 58,500		$ 197,278	$ 212,500	$ 12,500
Interest rate (as a percent)	3.75%	3.75%	3.75%		3.75%	3.75%	3.75%	3.75%		3.75%	3.75%
Conversion of convertible senior notes to common stock	$ 138,800		$ 138,800
Conversion of notes through common stock issuance (in shares)					0	0
Convertible senior notes			$ 60,400		$ 60,400
3.75% Convertible Senior Notes | Capped Call
Capped Call and Common Stock Forward
Capped call options amount		$ 16,200
Cap price		$ 6.7560
Premium (as a percent)		60.00%
Closing stock price on grant date		$ 4.11
5.5% Convertible Senior Notes
Capped Call and Common Stock Forward
Principal amount				$ 100,000
Interest rate (as a percent)			5.50%	5.50%	5.50%
5.5% Convertible Senior Notes | Common Stock Forward
Capped Call and Common Stock Forward
Common stock shares issued				14,397,906

XML

Stockholders' Equity - Common Stock and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended	4 Months Ended
	Feb. 23, 2024	Jan. 17, 2024	May 10, 2024	Mar. 31, 2024	May 10, 2024
Stockholders' equity
Aggregate offering price				$ 305,346
Net proceeds from shares of common stock sold				305,346
At Market Issuance Sales Agreement
Stockholders' equity
Net proceeds from shares of common stock sold				$ 309,300	$ 457,100
Common stock shares issued				79,553,175	135,354,467
Remaining authorized for issuance	$ 697,900
Common stock reserved for future issuance	$ 1,000,000
Stock issuance cost				$ 3,900	$ 6,500
Per share price of shares of common stock			$ 3.38	$ 3.89	$ 3.38
Maximum | At Market Issuance Sales Agreement
Stockholders' equity
Aggregate offering price		$ 1,000,000
Subsequent event | At Market Issuance Sales Agreement
Stockholders' equity
Net proceeds from shares of common stock sold			$ 147,800
Common stock shares issued			55,801,292
Stock issuance cost			$ 2,600
Per share price of shares of common stock			$ 2.65		$ 2.65

XML

Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - Foreign Currency Items - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated other comprehensive income(loss)
Other comprehensive loss before reclassifications		$ 1.7
Net current-period other comprehensive income	$ 2.3	$ 5.3

XML

Warrant Transaction Agreements - Amazon.com, Inc. Transaction Agreement (Details) $ / shares in Units, $ in Thousands			3 Months Ended
	Aug. 24, 2022 USD ($) $ / shares D shares	Jul. 20, 2020 D	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) shares	Dec. 31, 2023 shares	Jun. 30, 2023 USD ($) shares	Apr. 04, 2017 shares
Class of Warrant or Right [Line Items]
Selling, General and Administrative Expense | $			$ 77,959	$ 104,016
(Benefit)/loss on service contracts | $			$ 3,809	$ 221
2017 Amazon Transaction Agreement
Class of Warrant or Right [Line Items]
Shares of common stock that can be purchased from warrants issued (in shares)							55,286,696
Number of warrants exercised to date			34,917,912	27,600,000
Warrant shares vested (in shares)			55,286,696	55,286,696
Provision for common stock warrants | $			$ 0	$ 200
2017 Amazon Transaction Agreement | Maximum
Class of Warrant or Right [Line Items]
Shares of common stock that can be purchased from warrants issued (in shares)							55,286,696
2017 Amazon Transaction Agreement | Warrant Issued Tranche Three [Member]
Class of Warrant or Right [Line Items]
Threshold trading days | D		30
2017 Amazon Transaction Agreement | Amazon
Class of Warrant or Right [Line Items]
Number of warrants exercised (in shares)			34,917,912	34,917,912
Tranche one of warrants issued with the Amazon.com, Inc transaction agreement | Warrant Issued Tranche One [Member]
Class of Warrant or Right [Line Items]
Contract asset | $			$ 19,300
Tranche one of warrants issued with the Amazon.com, Inc transaction agreement | Warrant Issued Tranche Two [Member]
Class of Warrant or Right [Line Items]
Contract asset | $			19,300
Tranche one of warrants issued with the Amazon.com, Inc transaction agreement | Amazon
Class of Warrant or Right [Line Items]
Provision for common stock warrants | $			0
Warrant Issued With Amazon
Class of Warrant or Right [Line Items]
Provision for common stock warrants | $			$ 700
2022 Amazon transaction agreement
Class of Warrant or Right [Line Items]
Minimum percentage of warrants vested and exercisable automatically	60.00%
Shares of common stock that can be purchased from warrants issued (in shares)	16,000,000
Number of warrants exercised to date			0	0
Warrant shares vested (in shares)			2,000,000		2,000,000
Provision for common stock warrants | $				$ 1,100
2022 Amazon transaction agreement | Maximum
Class of Warrant or Right [Line Items]
Shares of common stock that can be purchased from warrants issued (in shares)	16,000,000
2022 Amazon transaction agreement | Warrants Tranches One Through Three [Member]
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)	9,000,000
Exercise price of warrants (in dollars per share) | $ / shares	$ 22.9841
Fair value of warrants per share | $ / shares	$ 20.36
2022 Amazon transaction agreement | Warrants Tranches One Through Three [Member] | Risk free interest rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input	0.0315
2022 Amazon transaction agreement | Warrants Tranches One Through Three [Member] | Volatility
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input	0.7500
2022 Amazon transaction agreement | Warrants Tranches One Through Three [Member] | Expected average term
Class of Warrant or Right [Line Items]
Expected average term	7 years
2022 Amazon transaction agreement | Warrants Tranches One Through Three [Member] | Exercise price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares	22.98
2022 Amazon transaction agreement | Warrants Tranches One Through Three [Member] | Stock price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares	20.36
2022 Amazon transaction agreement | Warrant Issued Tranche One [Member]
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)	1,000,000
Warrant charge capitalized | $	$ 20,400
2022 Amazon transaction agreement | Warrant Issued Tranche Two [Member]
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)						1,000,000
Warrant charge capitalized | $						$ 20,400
2022 Amazon transaction agreement | Warrant Issued Tranche Three [Member]
Class of Warrant or Right [Line Items]
Cash payments to be received under agreement | $	$ 1,000,000
Contract asset | $			$ 2,000
2022 Amazon transaction agreement | Warrant Issued Tranche Four [Member]
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)	7,000,000
Warrant percentage weighted average share price	90.00%
Threshold trading days | D	30
2022 Amazon transaction agreement | Warrant Issued Tranche Four [Member] | Risk free interest rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input			0.0412
2022 Amazon transaction agreement | Warrant Issued Tranche Four [Member] | Volatility
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input			0.9000
2022 Amazon transaction agreement | Warrant Issued Tranche Four [Member] | Expected average term
Class of Warrant or Right [Line Items]
Expected average term			4 years
2022 Amazon transaction agreement | Warrant Issued Tranche Four [Member] | Exercise price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares			3.10
2022 Amazon transaction agreement | Warrant Issued Tranche Four [Member] | Stock price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares			3.44
2022 Amazon transaction agreement | Vest in multiple tranches
Class of Warrant or Right [Line Items]
Vesting period	7 years
Cash payments to be received under agreement | $	$ 2,100,000
Warrant shares vested (in shares)	15,000,000

XML

Warrant Transaction Agreements - Walmart Stores, Inc. Transaction Agreement (Details) $ / shares in Units, $ in Thousands				3 Months Ended		12 Months Ended
	Oct. 30, 2023 $ / shares	Jan. 01, 2019 $ / shares	Jul. 20, 2017 USD ($) installment $ / shares shares	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 USD ($) shares	Dec. 31, 2023 shares
Warrant Transaction Agreements
Provision compared for common stock warrants				$ 10,236	$ 19,641
Warrants issued with the Walmart Stores, Inc transaction agreement
Warrant Transaction Agreements
Shares of common stock that can be purchased from warrants issued (in shares) | shares			55,286,696
Number of warrants exercised to date | shares				13,094,217	13,094,217
Warrant shares vested (in shares) | shares				37,464,010		34,917,912
Contract asset				$ 6,900
Provision compared for common stock warrants				3,700	$ 12,900
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrants Tranches One And Two [Member]
Warrant Transaction Agreements
Cash payments to be received under agreement			$ 200,000
Exercise price of warrants (in dollars per share) | $ / shares			$ 2.1231
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrants Tranches One And Two [Member] | Risk free interest rate
Warrant Transaction Agreements
Warrants and rights outstanding measurement input		0.0263
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrants Tranches One And Two [Member] | Volatility
Warrant Transaction Agreements
Warrants and rights outstanding measurement input		0.9500
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrants Tranches One And Two [Member] | Expected average term
Warrant Transaction Agreements
Expected average term		8 years 6 months 18 days
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrants Tranches One And Two [Member] | Exercise price
Warrant Transaction Agreements
Warrants and rights outstanding measurement input | $ / shares		2.12
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrants Tranches One And Two [Member] | Stock price
Warrant Transaction Agreements
Warrants and rights outstanding measurement input | $ / shares		1.24
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrant Issued Tranche Three [Member]
Warrant Transaction Agreements
Cash payments to be received under agreement			$ 400,000
Warrant shares vested (in shares) | shares			20,368,784
Warrant percentage weighted average share price			90.00%
Number of installments | installment			8
Number of shares per installment | shares			2,546,098
Cash receipt per installment			$ 50,000
Exercise price of warrants (in dollars per share) | $ / shares			$ 6.28
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrant Issued Tranche Three [Member] | Risk free interest rate
Warrant Transaction Agreements
Warrants and rights outstanding measurement input	0.0473
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrant Issued Tranche Three [Member] | Volatility
Warrant Transaction Agreements
Warrants and rights outstanding measurement input	0.7500
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrant Issued Tranche Three [Member] | Expected average term
Warrant Transaction Agreements
Expected average term	3 years 8 months 19 days
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrant Issued Tranche Three [Member] | Exercise price
Warrant Transaction Agreements
Warrants and rights outstanding measurement input | $ / shares	6.28
Warrants issued with the Walmart Stores, Inc transaction agreement | Warrant Issued Tranche Three [Member] | Stock price
Warrant Transaction Agreements
Warrants and rights outstanding measurement input | $ / shares	5.70
USE VESTING AXIS | Warrant Issued Tranche One [Member]
Warrant Transaction Agreements
Contract asset				19,300
USE VESTING AXIS | Warrant Issued Tranche Two [Member]
Warrant Transaction Agreements
Contract asset				$ 19,300
Walmart | Warrants issued with the Walmart Stores, Inc transaction agreement
Warrant Transaction Agreements
Number of warrants exercised (in shares) | shares				13,094,217		13,094,217
Amazon | USE VESTING AXIS
Warrant Transaction Agreements
Provision for common stock warrants				$ 0
Maximum | Warrants issued with the Walmart Stores, Inc transaction agreement
Warrant Transaction Agreements
Shares of common stock that can be purchased from warrants issued (in shares) | shares			55,286,696

XML

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue
Net revenue	$ 120,264	$ 210,286
Sales of fuel cell systems
Revenue
Net revenue	19,003	28,852
Sale of hydrogen infrastructure
Revenue
Net revenue	12,295	48,868
Sale of electrolyzers
Revenue
Net revenue	1,351	40,032
Sales of engineered equipment
Revenue
Net revenue	4,216	7,753
Services performed on fuel cell systems and related infrastructure
Revenue
Net revenue	13,023	9,097
Power purchase agreements
Revenue
Net revenue	18,304	7,937
Fuel delivered to customers and related equipment
Revenue
Net revenue	18,286	10,142
Sales of cryogenic equipment and other
Revenue
Net revenue	31,430	56,589
Other
Revenue
Net revenue	$ 2,356	$ 1,016

XML

Revenue - Contract balances (Details) - Sales of fuel cell systems - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Disaggregation of revenue
Accounts receivable	$ 148,822	$ 243,811
Contract assets	160,374	155,989
Deferred revenue and contract liabilities	$ 255,802	$ 288,302

XML

Revenue - Changes in contract assets and contract liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Contract assets
Net change in contract assets	$ (1,356)	$ 14,677
Contract liabilities
Increases due to cash received, net of amounts recognized as revenue during the period	12,057		$ 151,965
Change in contract liabilities related to warrants	110		440
Revenue recognized that was included in the contract liability balance as of the beginning of the period	(44,667)		(94,001)
Net change in deferred revenue and contract liabilities	(32,500)		58,404
Sales of fuel cell systems
Contract assets
Transferred to receivables from contract assets recognized at the beginning of the period	(9,082)		(94,860)
Change in contract assets related to warrants	5,850		14,260
Impairment			(2,375)
Revenue recognized and not billed as of the end of the period	7,617		134,677
Net change in contract assets	$ 4,385		$ 51,702

XML

Revenue - Estimated future revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Revenue
Total estimated future revenue	$ 1,136,703
Sales of fuel cell systems
Revenue
Total estimated future revenue	55,671
Sale of hydrogen installations and other infrastructure
Revenue
Total estimated future revenue	31,039
Sale of electrolyzers
Revenue
Total estimated future revenue	303,127
Sale of oil and gas equipment
Revenue
Total estimated future revenue	14,559
Services performed on fuel cell systems and related infrastructure
Revenue
Total estimated future revenue	142,111
Power purchase agreements
Revenue
Total estimated future revenue	419,406
Fuel delivered to customers and related equipment
Revenue
Total estimated future revenue	93,685
Sales of cryogenic equipment and other
Revenue
Total estimated future revenue	$ 77,105
Maximum | Sales of fuel cell systems
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Maximum | Sale of electrolyzers
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	2 years
Maximum | Services performed on fuel cell systems and related infrastructure
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	10 years
Duration of estimated revenue expected to be recognized in future (in years)	10 years
Maximum | Power purchase agreements
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	10 years
Minimum | Sales of fuel cell systems
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	2 years
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Minimum | Sale of electrolyzers
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Minimum | Services performed on fuel cell systems and related infrastructure
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	5 years
Duration of estimated revenue expected to be recognized in future (in years)	5 years
Minimum | Power purchase agreements
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	5 years
Minimum | Fuel delivered to customers and related equipment
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year

XML

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Taxes
Income tax expense/(benefit)	$ 163	$ (1,270)
Global minimum corporate tax rate	15.00%

XML

Fair Value Measurements - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Fair Value Measurements
Transfers between Level 1, Level 2, and Level 3	$ 0.0

XML

Fair Value Measurements - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Jan. 14, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Change in fair value of contingent consideration	$ (9,200)	$ 8,769
Cash payments	10,000
Foreign currency translation adjustment	(690)
Payments of contingent consideration	836	$ 2,000
Recurring basis | Level 3 | Contingent consideration
Fair Value
Liabilities, Fair value	106,326		$ 126,216
Joule Processing LLC
Fair Value
Contingent consideration				$ 41,700
Change in fair value of contingent consideration	7,500
Joule Processing LLC | Contingent consideration
Fair Value
Liabilities, Fair value	5,000
Carrying value | Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value	106,326		126,216
Fair value | Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value	106,326		126,216
Fair value | Giner ELX, Inc | Contingent consideration
Fair Value
Liabilities, Fair value	18,700		18,000
Contingent consideration						$ 16,000
Fair value | United Hydrogen Group Inc | Contingent consideration
Fair Value
Liabilities, Fair value	1,000		900
Contingent consideration						$ 1,100
Fair value | Frames Holding B.V. | Contingent consideration
Fair Value
Liabilities, Fair value	28,600		31,800
Contingent consideration					$ 29,100
Change in fair value of contingent consideration	(2,500)
Foreign currency translation adjustment	700
Fair value | Joule Processing LLC | Contingent consideration
Fair Value
Liabilities, Fair value	5,000		$ 75,500
Cash payments	10,000
Fair value | Joule Processing LLC | Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value	$ 106,300

XML

Fair Value Measurements - Assets and liabilities measured at fair value on recurring basis that have unobservable inputs (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Credit spread | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		0.1361
Recurring basis | Level 3 | Scenario based method | Credit spread | Business Combination, One | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	13.61
Recurring basis | Level 3 | Scenario based method | Credit spread | Business Combination, One | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	14.04
Recurring basis | Level 3 | Scenario based method | Discount rate | Business Combination, One | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	17.98
Recurring basis | Level 3 | Scenario based method | Discount rate | Business Combination, One | Maximum | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	19.06
Fair value | Frames Holding B.V. | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration			$ 29,100
Fair value | Giner ELX, Inc | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration				$ 16,000
Fair value | United Hydrogen Group Inc | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration				$ 1,100
Fair value | Discount rate | Minimum | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		0.1771
Fair value | Discount rate | Maximum | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		0.1906
Fair value | Scenario based method
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration		$ 126,216
Fair value | Recurring basis | Level 3 | Scenario based method
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration	$ 106,326
Fair value | Recurring basis | Level 3 | Scenario based method | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration	$ 106,326

XML

Fair Value Measurements - Level 3 Instruments Reconciliation (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Reconciliations of the beginning and ending balances for liabilities measured at fair value on a recurring basis using significant unobservable inputs (i.e. Level 3)
Balance at the beginning of the period	$ 126,216
Cash payments	(10,000)
Fair value adjustments	(9,200)
Foreign currency translation adjustment	(690)
Balance at the end of the period	$ 106,326

XML

Investments - Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 61,072		$ 56,096
Capital commitment to be made in remainder of 2024		$ 98,100
HyVia
Schedule of Equity Method Investments [Line Items]
Common Stock Ownership %	50.00%		50.00%
Carrying Value	$ 1,402		$ (2,068)
Payments to acquire equity method investments	$ 16,200	22,300
AccionaPlug S.L.
Schedule of Equity Method Investments [Line Items]
Common Stock Ownership %	50.00%		50.00%
Carrying Value	$ 4,371		$ 3,198
Payments to acquire equity method investments	$ 1,700	0
Clean H2 Infra Fund
Schedule of Equity Method Investments [Line Items]
Common Stock Ownership %	5.00%		5.00%
Carrying Value	$ 17,428		$ 13,357
Payments to acquire equity method investments	$ 4,000	0
SK Plug Hyverse
Schedule of Equity Method Investments [Line Items]
Common Stock Ownership %	49.00%		49.00%
Carrying Value	$ 37,871		$ 41,609
Payments to acquire equity method investments	$ 0	$ 17,800

XML

Operating and Finance Lease Liabilities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Lessee, Lease, Description
Rental expense for all operating lease	$ 26.3	$ 21.9
Prepaid rent and security deposit	7.4
Finance lease, right-of-use asset, amortization and interest expense	1.9	$ 1.1
Right of use assets, finance lease	56.1		$ 57.3
Accumulated amortization of right-of-use asset from finance lease	$ 10.1		$ 9.0
Minimum
Lessee, Lease, Description
Lease Term - as Lessee	1 year
Maximum
Lessee, Lease, Description
Lease Term - as Lessee	7 years

XML

Operating and Finance Lease Liabilities - Future minimum lease payments under operating and finance leases (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Future minimum lease payments under operating lease
Remainder of 2024	$ 50,427
2025	72,561
2026	85,950
2027	94,822
2028	74,684
2029 and thereafter	147,725
Total future minimum lease payments	526,169
Less imputed interest	(182,699)
Total operating lease, liabilities	343,470
Future minimum lease payments under finance leases
Remainder of 2024	9,089
2025	15,030
2026	12,172
2027	8,482
2028	1,896
2029 and thereafter	3,243
Total future minimum lease payments	49,912
Less imputed interest	(6,637)
Total finance lease liabilities	43,275
Future minimum lease payments under operating and finance leases
Remainder of 2024	52,323
2025	81,043
2026	98,122
2027	109,852
2028	83,773
2029 and thereafter	150,968
Total future minimum payments	576,081
Less imputed interest	(189,336)
Total	$ 386,745

XML

Operating and Finance Lease Liabilities - Other information related to the operating leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other information of operating leases
Cash payments - operating cash flows (in thousands)	$ 24,960	$ 21,648
Weighted average remaining lease term (in years)	7 years 2 months 15 days	2 years 7 months 28 days
Weighted average discount rate (as a percent)	11.50%	11.30%

XML

Operating and Finance Lease Liabilities - Other information related to the finance leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other information
Cash payments - operating cash flows (in thousands)	$ 764	$ 766
Cash payments - financing cash flows (in thousands)	$ 2,272	$ 2,059
Weighted average remaining lease term (in years)	3 years 7 months 28 days	3 years 9 months 10 days
Weighted average discount rate (as a percent)	6.80%	6.70%

XML

Finance Obligation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Finance Obligation
Finance obligation under sale-leaseback transaction	$ 349,785
Current portion of finance obligation in sale-leaseback transaction	85,175		$ 84,031
Noncurrent portion of finance obligation in sale-leaseback transaction	264,610		284,363
Sale of Future Revenue - Debt
Finance Obligation
Finance obligation under sale-leaseback transaction	333,021		350,800
Current portion of finance obligation in sale-leaseback transaction	75,700		74,000
Noncurrent portion of finance obligation in sale-leaseback transaction	257,300		276,800
Interest on lease liabilities, finance lease	10,000	$ 9,200
Sale/Leaseback Financings
Finance Obligation
Finance obligation under sale-leaseback transaction	16,764		17,600
Current portion of finance obligation in sale-leaseback transaction	9,500		10,000
Noncurrent portion of finance obligation in sale-leaseback transaction	$ 7,300		$ 7,600

XML

Finance Obligation - Future minimum payments under finance obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Future minimum payments under finance obligations
Remainder of 2024	$ 92,277
2025	106,776
2026	90,053
2027	73,482
2028	53,203
2029 and thereafter	26,634
Total future minimum payments	442,425
Less imputed interest	(92,640)
Total	349,785
Sale of Future Revenue - Debt
Future minimum payments under finance obligations
Remainder of 2024	82,353
2025	104,547
2026	87,824
2027	71,253
2028	51,188
2029 and thereafter	25,503
Total future minimum payments	422,668
Less imputed interest	(89,647)
Total	333,021	$ 350,800
Sale/Leaseback Financings
Future minimum payments under finance obligations
Remainder of 2024	9,924
2025	2,229
2026	2,229
2027	2,229
2028	2,015
2029 and thereafter	1,131
Total future minimum payments	19,757
Less imputed interest	(2,993)
Total	$ 16,764	$ 17,600

XML

Finance Obligation - Other information related to finance obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Sale Leaseback Transaction [Line Items]
Cash payments - financing cash flows (in thousands)	$ 2,272	$ 2,059
Weighted average remaining term (years)	3 years 7 months 28 days	3 years 9 months 10 days
Weighted average discount rate (as a percent)	6.80%	6.70%
Finance obligation
Sale Leaseback Transaction [Line Items]
Cash payments - financing cash flows (in thousands)	$ 28,660	$ 24,311
Weighted average remaining term (years)	4 years 3 months 7 days	4 years 9 months 3 days
Weighted average discount rate (as a percent)	11.30%	11.20%

XML

Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) customer	Mar. 31, 2023 customer	Dec. 31, 2023 USD ($) customer
Customer Concentration
Restricted cash	$ 552,800		$ 573,500
Letter of credit	351,800		370,700
Letters of credit on sale/leaseback agreements	321,000		340,000
Customs related letters of credit	30,800		30,700
Construction escrow	76,900		76,800
Federal depository insurance coverage	250
Joule Processing LLC
Customer Concentration
Consideration held by paying agent.	1,200
Alloy Custom Products, LLC and WesMor Cryogenics, LLC
Customer Concentration
Consideration held by paying agent.	200
Collateral Related to Acquisitions | Frames Holding B.V.
Customer Concentration
Restricted cash as collateral	$ 12,300		$ 11,700
Accounts receivable | Customer concentration | One customers
Customer Concentration
Number of customers | customer			1
Concentration risk (as a percent)			21.50%
Accounts receivable | Customer concentration | Three customers
Customer Concentration
Number of customers | customer	3
Concentration risk (as a percent)	30.30%
Revenues | Customer concentration | Two customers
Customer Concentration
Number of customers | customer	2	2
Concentration risk (as a percent)	44.20%	25.50%

XML

Commitments and Contingencies - Purchase Obligations (Details) $ in Thousands, € in Millions	3 Months Ended
	Mar. 31, 2024 EUR (€)	Mar. 31, 2024 USD ($)	May 30, 2023 EUR (€)
Guarantee
Amount of guarantee | €			€ 20
Payments related to guarantee | €	€ 0
Recorded Unconditional Purchase Obligation, Fiscal Year Maturity Schedule [Abstract]
Remainder of 2024		$ 37,742
2025		8,023
2026		8,023
2027		2,638
Total		$ 56,426

XML

Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Employee Benefit Plans
Compensation cost	$ 10,371	$ 40,181
Service Stock Options Awards
Employee Benefit Plans
Compensation cost	$ 6,900	8,200
Performance Stock Option Awards
Employee Benefit Plans
Options exercisable (as a percent)	200.00%
Compensation cost	$ 6,100	17,400
Stock Incentive Plan 2011 And 2021
Employee Benefit Plans
Compensation cost	10,400	40,200
Company's matching contributions	3,200	3,200
Cost of sales
Employee Benefit Plans
Compensation cost	2,006	2,677
Research and development
Employee Benefit Plans
Compensation cost	2,342	2,283
Selling, general and administrative
Employee Benefit Plans
Compensation cost	$ 6,023	$ 35,221

XML

Employee Benefit Plans - Stock Activity, Weighted Average Exercise Price (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Shares
Granted (in shares)	313,000	94,550
Stock option activity additional disclosures
Compensation cost	$ 10,371	$ 40,181
Options granted	313,000	94,550
Service Stock Options Awards
Shares
Options outstanding, beginning balance (in shares)	17,336,362
Options exercisable, beginning balance (in shares)	8,288,944
Options unvested, beginning balance (in shares)	9,047,418
Granted (in shares)	313,000
Exercised (in shares)	(20,000)
Forfeited (in shares)	(920,300)
Options outstanding, end balance (in shares)	16,709,062		17,336,362
Options exercisable, ending balance (in shares)	8,334,755		8,288,944
Options unvested, ending balance (in shares)	8,374,307		9,047,418
Weighted Average Exercise Price
Options outstanding, beginning balance, weighted-average exercise price	$ 11.37
Options exercisable, beginning balance, weighted-average exercise price	11.84
Options unvested, beginning balance, weighted-average exercise price	10.94
Granted, weighted-average exercise price	3.28
Exercised, weighted-average exercise price	2.10
Forfeited, weighted-average exercise price	19.42
Options outstanding, ending balance, weighted-average exercise price	10.79		$ 11.37
Options exercisable, ending balance, weighted-average exercise price	11.93		11.84
Options unvested, ending balance, weighted-average exercise price	$ 9.65		$ 10.94
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term	7 years 7 months 6 days		7 years 10 months 9 days
Options exercisable, weighted-average remaining contractual term	5 years 10 months 24 days		6 years 2 months 4 days
Options unvested, weighted-average remaining contractual term	9 years 3 months 14 days		9 years 4 months 20 days
Options outstanding, aggregate intrinsic value	$ 3,858		$ 11,391
Options exercisable, aggregate intrinsic value	3,792		7,250
Options unvested, aggregate intrinsic value	$ 66		$ 4,141
Weighted-average grant date fair value of options granted (per share)	$ 2.41	$ 10.48
Fair value of stock options that vested during the period	$ 6,100	$ 7,500
Option expected to vest (in shares)	3,904,333
Compensation cost	$ 6,900	8,200
Unrecognized compensation cost	$ 40,700
Period for recognition	1 year 11 months 26 days
Intrinsic fair value of options exercised	$ 30	$ 1,300
Options granted	313,000
Performance Stock Option Awards
Shares
Options outstanding, beginning balance (in shares)	21,925,000
Options exercisable, beginning balance (in shares)	2,782,000
Options unvested, beginning balance (in shares)	19,143,000
Exercised (in shares)	0	0
Forfeited (in shares)	(2,250,000)
Options outstanding, end balance (in shares)	19,675,000		21,925,000
Options exercisable, ending balance (in shares)	2,782,000		2,782,000
Options unvested, ending balance (in shares)	16,893,000		19,143,000
Weighted Average Exercise Price
Options outstanding, beginning balance, weighted-average exercise price	$ 21.32
Options exercisable, beginning balance, weighted-average exercise price	26.9
Options unvested, beginning balance, weighted-average exercise price	20.50
Options outstanding, ending balance, weighted-average exercise price	21.44		$ 21.32
Options exercisable, ending balance, weighted-average exercise price	26.92		26.9
Options unvested, ending balance, weighted-average exercise price	$ 20.54		$ 20.50
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term	4 years 11 months 12 days		5 years 3 months 7 days
Options exercisable, weighted-average remaining contractual term	4 years 5 months 23 days		4 years 8 months 12 days
Options unvested, weighted-average remaining contractual term	5 years 10 days		5 years 4 months 6 days
Weighted-average grant date fair value of options granted (per share)	$ 0	$ 0
Fair value of stock options that vested during the period	$ 0	$ 0
Unvested stock options expected to vest period for calculation of weighted- average exercise price	5 years 6 months 14 days
Unvested stock options, weighted- average exercise price	$ 14.66
Compensation cost	$ 6,100	$ 17,400
Unvested performance stock options	15,200
Non-cash compensation expense reversals compensation cost	9,100
Unrecognized compensation cost	21,000
Aggregate intrinsic value of unvested performance stock options	$ 0
Period for recognition	1 year 4 months 17 days

XML

Employee Benefit Plans - Restricted Common Stock and Restricted Stock Unit Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Employee Benefit Plans
Compensation cost	$ 10,371	$ 40,181
Restricted stock and restricted stock units outstanding
Employee Benefit Plans
Compensation cost	9,600	14,600
Unrecognized compensation cost	$ 63,300
Period for recognition	1 year 10 months 6 days
Fair value of restricted stock units vested	$ 6,600	$ 13,500
Outstanding balance	5,914,856
Shares
Unvested restricted stock and restricted stock units, beginning balance (in shares)	6,732,884
Granted (in shares)	17,000
Vested (in shares)	(230,675)
Forfeited (in shares)	(604,353)
Unvested restricted stock and restricted stock units, end balance (in shares)	5,914,856
Weighted Average Grant Date Fair Value
Unvested restricted stock, beginning balance, weighted average grant date fair value	$ 15.66
Granted, weighted average grant date fair value	5.23	$ 15.44
Vested, weighted average grant date fair value	28.42
Forfeited, weighted average grant date fair value	18.69
Unvested restricted stock, end balance, weighted average grant date fair value	$ 14.82
Aggregate Intrinsic Value
Unvested restricted stock, beginning balance, aggregate intrinsic value	$ 30,298
Unvested restricted stock, end balance, aggregate intrinsic value	20,347
Restricted common units with performance target
Employee Benefit Plans
Compensation cost	600
Unrecognized compensation cost	$ 2,500
Period for recognition	2 years 3 months 29 days
Outstanding balance	375,000
Shares
Unvested restricted stock and restricted stock units, end balance (in shares)	375,000

XML

Employee Benefit Plans - 401(K) Saving And Retirement Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Non-Employee Benefit Plan Compensation
Compensation cost	$ 10,371	$ 40,181
Non Employee Director
Non-Employee Benefit Plan Compensation
Granted (in shares)	53,598	10,316
Compensation cost	$ 200	$ 100
Savings And Retirement Plan 401 K
401(K) Savings & Retirement Plan
Common stock, shares issued	895,258	219,970
Total expense (including issuance of shares)	$ 3,200	$ 3,000

XML

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accrued Expenses
Accrued payroll and compensation related costs	$ 24,193	$ 32,584
Accrual for capital expenditures	48,072	83,781
Accrued accounts payable	63,435	64,767
Accrued sales and other taxes	17,738	17,207
Accrued interest	969	562
Accrued other	407	1,643
Total	$ 154,814	$ 200,544

XML

Segment and Geographic Area Reporting - Segment and reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment and Geographic Area Reporting
Revenues.	$ 120,264	$ 210,286
Cost of revenue	(279,339)	(279,682)
Gross loss	(159,075)	(69,396)
Consolidated operating expenses	(100,334)	(140,403)
Loss before income taxes	$ (295,613)	$ (207,831)

XML

Segment and Geographic Area Reporting - Geographical (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment and Geographic Area Reporting
Number of operating segments | segment	1
Number of reportable segments | segment	1
Revenues	$ 120,264	$ 210,286
Long-Lived Assets	2,014,432		$ 2,004,688
North America
Segment and Geographic Area Reporting
Revenues	105,914	161,807
Long-Lived Assets	1,904,277		1,881,315
Europe
Segment and Geographic Area Reporting
Revenues	8,571	40,153
Long-Lived Assets	108,869		122,489
Asia
Segment and Geographic Area Reporting
Revenues	5,074	3,255
Other
Segment and Geographic Area Reporting
Revenues	705	$ 5,071
Long-Lived Assets	$ 1,286		$ 884

XML

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transactions
Related party total revenue	$ 120,264	$ 210,286
HyVia
Related Party Transactions
Ownership percentage in joint venture	50.00%		50.00%
Related party total revenue	$ 3,100	3,800
Outstanding accounts receivable	$ 2,800		$ 2,300
SK Plug Hyverse
Related Party Transactions
Ownership percentage in joint venture	49.00%		49.00%
Related party total revenue	$ 3,400	$ 200
Outstanding accounts receivable	$ 4,300		$ 1,700

XML

Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 6,011
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	5,200
Restructuring Reserve, Current	800
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	1,100
Restructuring Reserve, Current	600
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	800
Restructuring Reserve, Current	100
Other Specified Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current	$ 200

XML

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	4 Months Ended
	May 10, 2024	Mar. 31, 2024	May 10, 2024
Subsequent Events
Gross proceeds		$ 305,346
At Market Issuance Sales Agreement
Subsequent Events
Common stock shares issued		79,553,175	135,354,467
Sales price per share	$ 3.38	$ 3.89	$ 3.38
Gross proceeds		$ 309,300	$ 457,100
Stock issuance cost		$ 3,900	$ 6,500
Subsequent Event | At Market Issuance Sales Agreement
Subsequent Events
Common stock shares issued	55,801,292
Sales price per share	$ 2.65		$ 2.65
Gross proceeds	$ 147,800
Stock issuance cost	$ 2,600

XML

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (295,776)	$ (206,561)

XML

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Modified	false
Rule 10b5-1 Arrangement Modified	false