10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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 June 30, 2021

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: 001-33480

CLEAN ENERGY FUELS CORP.

(Exact name of registrant as specified in its charter)

Delaware	33-0968580
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

4675 MacArthur Court, Suite 800, Newport Beach, CA 92660

(Address of principal executive offices, including zip code)

(949) 437-1000

(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, $0.0001 par value per share	CLNE	The Nasdaq Select Market LLC (Nasdaq Global Select 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, a smaller reporting company, or an emerging growth company. See 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 ☒

As of July 30, 2021, there were 222,992,133 shares of the registrant’s common stock, par value $0.0001 per share, issued and outstanding.

CLEAN ENERGY FUELS CORP. AND SUBSIDIARIES

INDEX

Table of Contents

PART I.—FINANCIAL INFORMATION	3
Item 1.—Financial Statements (Unaudited)	3
Item 2.—Management’s Discussion and Analysis of Financial Condition and Results of Operations	28
Item 3.—Quantitative and Qualitative Disclosures about Market Risk	42
Item 4.—Controls and Procedures	43
PART II.—OTHER INFORMATION	45
Item 1.—Legal Proceedings	45
Item 1A.—Risk Factors	45
Item 2.—Unregistered Sales of Equity Securities and Use of Proceeds	60
Item 3.—Defaults upon Senior Securities	60
Item 4.—Mine Safety Disclosures	60
Item 5.—Other Information	60
Item 6.—Exhibits	61

Unless the context indicates otherwise, all references to “Clean Energy,” the “Company,” “we,” “us,” or “our” in this report refer to Clean Energy Fuels Corp. together with its consolidated subsidiaries.

This report contains forward-looking statements. See the cautionary note regarding these statements in Part I, Item 2.-Management’s Discussion and Analysis of Financial Condition and Results of Operations of this report.

We own registered or unregistered trademark rights to Clean Energy™. Although we do not use the “®” or “™” symbol in each instance in which one of our trademarks appears in this report, this should not be construed as any indication that we will not assert our rights thereto to the fullest extent under applicable law. Any other service marks, trademarks and trade names appearing in this report are the property of their respective owners.

2

PART I.—FINANCIAL INFORMATION

Item 1.—Financial Statements (Unaudited)

Clean Energy Fuels Corp. and Subsidiaries

Condensed Consolidated Balance Sheets

(In thousands, except share and per share data; Unaudited)

	December 31,		June 30,
	2020		2021
Assets
Current assets:
Cash and cash equivalents	$	108,977	$	134,041
Short-term investments		29,528		120,208
Accounts receivable, net of allowance of $1,335 and $1,184 as of December 31, 2020 and June 30, 2021, respectively		61,784		66,497
Other receivables		23,655		14,859
Inventory		28,100		27,968
Prepaid expenses and other current assets		9,404		19,973
Derivative assets, related party		1,591		—
Total current assets		263,039		383,546
Operating lease right-of-use assets		25,967		34,586
Land, property and equipment, net		290,911		274,686
Restricted cash		11,000		7,004
Notes receivable and other long-term assets, net		27,299		70,214
Long-term portion of derivative assets, related party		4,057		—
Investments in other entities		27,962		78,007
Goodwill		64,328		64,328
Intangible assets, net		464		171
Total assets	$	715,027	$	912,542
Liabilities and Stockholders' Equity
Current liabilities:
Current portion of debt	$	3,592	$	8,689
Current portion of finance lease obligations		840		807
Current portion of operating lease obligations		2,822		3,154
Accounts payable		17,310		18,031
Accrued liabilities		52,637		50,351
Deferred revenue		2,642		3,089
Derivative liabilities, related party		—		709
Total current liabilities		79,843		84,830
Long-term portion of debt		82,088		29,569
Long-term portion of finance lease obligations		2,552		2,593
Long-term portion of operating lease obligations		23,698		31,704
Long-term portion of derivative liabilities, related party		—		984
Other long-term liabilities		3,996		7,619
Total liabilities		192,177		157,299
Commitments and contingencies (Note 17)
Stockholders’ equity:
Preferred stock, $0.0001 par value. 1,000,000 shares authorized; no shares issued and outstanding		—		—
Common stock, $0.0001 par value. 304,000,000 and 454,000,000 shares authorized; 198,491,204 shares and 222,966,955 shares issued and outstanding as of December 31, 2020 and June 30, 2021, respectively		20		22
Additional paid-in capital		1,191,791		1,511,742
Accumulated deficit		(678,096)		(764,932)
Accumulated other comprehensive loss		(209)		(373)
Total Clean Energy Fuels Corp. stockholders’ equity		513,506		746,459
Noncontrolling interest in subsidiary		9,344		8,784
Total stockholders’ equity		522,850		755,243
Total liabilities and stockholders’ equity	$	715,027	$	912,542

See accompanying notes to condensed consolidated financial statements.

3

Clean Energy Fuels Corp. and Subsidiaries

Condensed Consolidated Statements of Operations

(In thousands, except share and per share data; Unaudited)

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Revenue:
Product revenue	$	50,426	$	(8,965)	$	126,128	$	58,727
Service revenue		9,448		9,445		19,752		18,896
Total revenue		59,874		480		145,880		77,623
Operating expenses:
Cost of sales (exclusive of depreciation and amortization shown separately below):
Product cost of sales		33,054		41,294		79,727		86,102
Service cost of sales		5,499		5,617		11,758		11,210
Change in fair value of derivative warrants		(445)		—		(40)		—
Selling, general and administrative		16,892		21,606		35,151		43,047
Depreciation and amortization		12,050		11,381		23,974		23,116
Total operating expenses		67,050		79,898		150,570		163,475
Operating loss		(7,176)		(79,418)		(4,690)		(85,852)
Interest expense		(1,841)		(1,002)		(4,051)		(2,438)
Interest income		273		240		654		494
Other income, net		2,287		166		2,462		844
Income (loss) from equity method investments		(502)		121		(357)		(305)
Loss before income taxes		(6,959)		(79,893)		(5,982)		(87,257)
Income tax expense		(78)		(56)		(156)		(139)
Net loss		(7,037)		(79,949)		(6,138)		(87,396)
Loss attributable to noncontrolling interest		301		282		1,106		560
Net loss attributable to Clean Energy Fuels Corp.	$	(6,736)	$	(79,667)	$	(5,032)	$	(86,836)
Net loss attributable to Clean Energy Fuels Corp. per share:
Basic and diluted	$	(0.03)	$	(0.38)	$	(0.02)	$	(0.43)
Weighted-average common shares outstanding:
Basic and diluted		200,670,137		207,047,221		202,831,346		203,043,580

See accompanying notes to condensed consolidated financial statements.

4

Clean Energy Fuels Corp. and Subsidiaries

Condensed Consolidated Statements of Comprehensive Loss

(In thousands; Unaudited)

	Clean Energy Fuels Corp.				Noncontrolling Interest				Total
	Three Months Ended				Three Months Ended				Three Months Ended
	June 30,				June 30,				June 30,
	2020		2021		2020		2021		2020		2021
Net loss	$	(6,736)	$	(79,667)	$	(301)	$	(282)	$	(7,037)	$	(79,949)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in 2020 and 2021		1,007		719		—		—		1,007		719
Unrealized losses on available-for-sale securities, net of $0 tax in 2020 and 2021		(1)		(3)		—		—		(1)		(3)
Total other comprehensive income		1,006		716		—		—		1,006		716
Comprehensive loss	$	(5,730)	$	(78,951)	$	(301)	$	(282)	$	(6,031)	$	(79,233)

	Clean Energy Fuels Corp.				Noncontrolling Interest				Total
	Six Months Ended				Six Months Ended				Six Months Ended
	June 30,				June 30,				June 30,
	2020		2021		2020		2021		2020		2021
Net loss	$	(5,032)	$	(86,836)	$	(1,106)	$	(560)	$	(6,138)	$	(87,396)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in 2020 and 2021		(914)		(161)		—		—		(914)		(161)
Unrealized gains (losses) on available-for-sale securities, net of $0 tax in 2020 and 2021		5		(3)		—		—		5		(3)
Total other comprehensive loss		(909)		(164)		—		—		(909)		(164)
Comprehensive loss	$	(5,941)	$	(87,000)	$	(1,106)	$	(560)	$	(7,047)	$	(87,560)

See accompanying notes to condensed consolidated financial statements.

5

Clean Energy Fuels Corp. and Subsidiaries

Condensed Consolidated Statements of Stockholders’ Equity

(In thousands; except share data)

								Accumulated
				Additional				Other		Noncontrolling		Total
	Common Stock			Paid-In		Accumulated		Comprehensive		Interest in		Stockholders’
	Shares	Amount		Capital		Deficit		Loss		Subsidiary		Equity
Balance, December 31, 2019	204,723,055	$	20	$	1,203,186	$	(668,232)	$	(1,566)	$	9,621	$	543,029
Issuance of common stock	871,010		—		194		—		—		—		194
Repurchase of common stock	(2,810,449)		—		(4,244)		—		—		—		(4,244)
Stock-based compensation	—		—		1,054		—		—		—		1,054
Net income (loss)	—		—		—		1,704		—		(805)		899
Other comprehensive loss	—		—		—		—		(1,915)		—		(1,915)
Increase in ownership in subsidiary	—		—		(1,388)		—		—		1,388		—
Balance, March 31, 2020	202,783,616		20		1,198,802		(666,528)		(3,481)		10,204		539,017
Issuance of common stock	25,214		—		41		—		—		—		41
Repurchase of common stock	(3,302,050)		—		(6,406)		—		—		—		(6,406)
Stock-based compensation	—		—		760		—		—		—		760
Net loss	—		—		—		(6,736)		—		(301)		(7,037)
Other comprehensive income	—		—		—		—		1,006		—		1,006
Balance, June 30, 2020	199,506,780	$	20	$	1,193,197	$	(673,264)	$	(2,475)	$	9,903	$	527,381

								Accumulated
				Additional				Other		Noncontrolling		Total
	Common Stock			Paid-In		Accumulated		Comprehensive		Interest in		Stockholders’
	Shares	Amount		Capital		Deficit		Loss		Subsidiary		Equity
Balance, December 31, 2020	198,491,204	$	20	$	1,191,791	$	(678,096)	$	(209)	$	9,344	$	522,850
Issuance of common stock	1,323,814		—		3,216		—		—		—		3,216
Stock-based compensation	—		—		3,367		—		—		—		3,367
Net loss	—		—		—		(7,169)		—		(278)		(7,447)
Other comprehensive loss	—		—		—		—		(880)		—		(880)
Balance, March 31, 2021	199,815,018		20		1,198,374		(685,265)		(1,089)		9,066		521,106
Issuance of common stock, net of issuance costs	23,151,937		2		194,171		—		—		—		194,173
Stock-based compensation	—		—		3,419		—		—		—		3,419
Stock-based sales incentive charges	—		—		115,778		—		—		—		115,778
Net loss	—		—		—		(79,667)		—		(282)		(79,949)
Other comprehensive income	—		—		—		—		716		—		716
Balance, June 30, 2021	222,966,955	$	22	$	1,511,742	$	(764,932)	$	(373)	$	8,784	$	755,243

See accompanying notes to condensed consolidated financial statements.

6

Clean Energy Fuels Corp. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(In thousands; Unaudited)

		Six Months Ended
		June 30,
	2020		2021
Cash flows from operating activities:
Net loss	$	(6,138)	$	(87,396)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization		23,974		23,116
Provision for credit losses and inventory		1,056		560
Stock-based compensation expense		1,814		6,786
Stock-based sales incentive charges		—		78,053
Change in fair value of derivative instruments		(4,205)		2,507
Amortization of discount and debt issuance cost		(103)		26
Loss (gain) on disposal of property and equipment		(2,298)		174
Loss on extinguishment of debt		—		25
Gain from sale of certain assets of subsidiary		(176)		—
Loss from equity method investments		357		305
Non-cash lease expense		1,373		1,470
Deferred income taxes		60		61
Changes in operating assets and liabilities:
Accounts and other receivables		73,904		2,211
Inventory		218		(732)
Prepaid expenses and other assets		365		(11,722)
Operating lease liabilities		(1,604)		(1,751)
Accounts payable		(10,572)		1,547
Deferred revenue		(8,787)		388
Accrued liabilities and other		(19,479)		(2,711)
Net cash provided by operating activities		49,759		12,917
Cash flows from investing activities:
Purchases of short-term investments		(45,293)		(177,981)
Maturities and sales of short-term investments		85,850		87,301
Purchases of and deposits on property and equipment		(6,354)		(7,888)
Disbursements for loans receivable		(40)		(3,828)
Payments on and proceeds from sales of loans receivable		1,226		224
Cash received from sale of certain assets of subsidiary, net		4,951		887
Investments in other entities		—		(50,669)
Proceeds from disposal of property and equipment		3,224		1,577
Net cash provided by (used in) investing activities		43,564		(150,377)
Cash flows from financing activities:
Issuance of common stock		235		203,923
Repurchase of common stock		(10,650)		—
Fees paid for issuance of common stock		—		(6,534)
Proceeds for Adopt-a-Port program		—		4,670
Proceeds from debt instruments		200		4,400
Proceeds from revolving line of credit		—		1,150
Repayments of borrowing under revolving line of credit		—		(650)
Repayments of debt instruments and finance lease obligations		(52,960)		(48,584)
Payments of debt extinguishment costs		—		(14)
Net cash (used in) provided by financing activities		(63,175)		158,361
Effect of exchange rates on cash, cash equivalents and restricted cash		(199)		167
Net increase in cash, cash equivalents and restricted cash		29,949		21,068
Cash, cash equivalents and restricted cash, beginning of period		53,222		119,977
Cash, cash equivalents and restricted cash, end of period	$	83,171	$	141,045
Supplemental disclosure of cash flow information:
Income taxes paid	$	65	$	10
Interest paid, net of $98 and $0 capitalized, respectively	$	3,906	$	2,460

See accompanying notes to condensed consolidated financial statements.

7

Clean Energy Fuels Corp. and Subsidiaries

Notes to Condensed Consolidated Financial Statements

(Unaudited)

Note 1—General

Nature of Business

Clean Energy Fuels Corp., together with its majority and wholly owned subsidiaries (hereinafter collectively referred to as the “Company,” unless the context or the use of the term indicates or requires otherwise) is a leading renewable energy company focused on the procurement and distribution of renewable natural gas (“RNG”) and conventional natural gas, in the form of compressed natural gas (“CNG”) and liquefied natural gas (“LNG”), for the United States and Canadian transportation markets. The Company is also focused on developing, owning, and operating dairy and other livestock waste RNG projects and supplying RNG (procured from our own projects or from third parties) to its customers in the heavy and medium -duty commercial transportation sector.

As a comprehensive clean energy solution provider, the Company also designs and builds, as well as operates and maintains, public and private vehicle fueling stations in the United States and Canada; sells and services compressors and other equipment used in RNG production and at fueling stations; transports and sells its fuels via “virtual” natural gas pipelines and interconnects; sells U.S. federal, state and local government credits it generates by selling RNG as a vehicle fuel, including Renewable Identification Numbers (“RIN Credits” or “RINs”) under the federal Renewable Fuel Standard Phase 2 and credits under the California and the Oregon Low Carbon Fuel Standards (collectively, “LCFS Credits”); and obtains federal, state and local tax credits, grants and incentives.

Basis of Presentation

The accompanying interim unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries, and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s consolidated financial position as of June 30, 2021, results of operations, comprehensive loss, and stockholders’ equity for the three and six months ended June 30, 2020 and 2021, and cash flows for the six months ended June 30, 2020 and 2021. All intercompany accounts and transactions have been eliminated in consolidation. The results of operations for the three and six month periods ended June 30, 2020 and 2021 are not necessarily indicative of the results to be expected for the year ending December 31, 2021 or for any other interim period or any future year.

Certain information and disclosures normally included in the notes to consolidated financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”), but the resultant disclosures contained herein are in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as they apply to interim reporting. The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements as of and for the year ended December 31, 2020 that are included in the Company’s Annual Report on Form 10-K filed with the SEC on March 9, 2021.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying condensed consolidated financial statements and these notes. Actual results could differ from those estimates and may result in material effects on the Company’s operating results and financial position. Significant estimates made in preparing the accompanying condensed consolidated financial statements include (but are not limited to) those related to revenue recognition, fair value measurements, goodwill and long-lived asset valuations and impairment assessments, income tax valuations, stock-based compensation expense and stock-based sales incentive charges.

8

Amazon Warrant

The Amazon Warrant (defined in Note 14) is accounted for as an equity instrument and measured in accordance with Accounting Standards Codification (“ASC”) 718, Compensation – Stock Compensation. This instrument is classified in the condensed consolidated statements of operations in accordance with ASC 606, Revenue from Contracts with Customers. For awards granted to a customer, which are not in exchange for distinct goods or services, the fair value of the awards earned based on service or performance conditions is recorded as a reduction of the transaction price, in accordance with ASC 606. To determine the fair value of the Amazon Warrant in accordance with ASC 718, the Company used the Black-Scholes option pricing model which is based in part on assumptions that require management to use judgment. Based on the fair value of the award, the Company determines the amount of non-cash stock-based sales incentive charges on the customer’s pro-rata achievement of vesting conditions, which is recorded as a reduction of revenue in the condensed consolidated statements of operations. See Note 14 for additional information.

Recently Adopted Accounting Pronouncements

In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The new standard clarifies and simplifies the accounting for income taxes, including guidance related to intraperiod tax allocation, the recognition of deferred tax liabilities for outside basis differences, the methodology for calculating income taxes in an interim period, and the application of income tax guidance to franchise taxes that are partially based on income. The Company adopted this standard in the first quarter of 2021. Adoption of this ASU did not have a material impact on the Company’s condensed consolidated financial statements.

Note 2—Revenue from Contracts with Customers

Revenue Recognition Overview

The Company recognizes revenue when control of the promised goods or services is transferred to its customers, in an amount that reflects the consideration to which it expects to be entitled in exchange for the goods or services. To achieve that core principle, a five-step approach is applied: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue allocated to each performance obligation when the Company satisfies the performance obligation. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account for revenue recognition.

The Company is generally the principal in its customer contracts because it has control over the goods and services prior to their transfer to the customer, and as such, revenue is recognized on a gross basis. Sales and usage-based taxes are excluded from revenue. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. The table below presents the Company’s revenue disaggregated by revenue source (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Volume-related (1) (2)	$	50,231	$	(10,829)	$	125,290	$	57,297
Station construction sales		5,277		6,071		10,800		10,606
AFTC (3)		4,366		5,238		9,790		9,720
Total revenue	$	59,874	$	480	$	145,880	$	77,623

(1) Includes changes in fair value of derivative instruments related to the Company’s commodity swap and customer fueling contracts associated with the Company’s Zero Now truck financing program. The amounts are classified as revenue because the Company’s commodity swap contracts are used to economically offset the risk associated with the diesel-to-natural gas price spread resulting from customer fueling contracts under the Company’s Zero Now truck financing program. See Note 6 for more information about these derivative instruments. For the three and six months ended June 30, 2020, aggregate changes in the fair value of commodity swaps and customer fueling contracts amounted to a loss of $1.5 million and a gain of $4.2 million, respectively. For the three and six months ended June 30, 2021, aggregate changes in the fair value of commodity swaps and customer fueling contracts amounted to a loss of $0.5 million and $2.5 million, respectively.

9

(2) Includes $78.1 million of non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant for the three and six months ended June 30, 2021. See Note 14 for more information.

(3) Represents the federal alternative fuel excise tax credit that we refer to as “AFTC,” which was extended for vehicle fuel sales made beginning January 1, 2021 through December 31, 2021.  See Note 19 for more information.

Remaining Performance Obligations

Remaining performance obligations represent the transaction price of customer orders for which the work has not been performed. As of June 30, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was $12.9 million, which related to the Company’s station construction sale contracts. The Company expects to recognize revenue on the remaining performance obligations under these contracts over the next 12 to 24 months.

For volume-related revenue, the Company has elected to apply an optional exemption, which waives the requirement to disclose the remaining performance obligation for revenue recognized through the ‘right to invoice’ practical expedient.

Contract Balances

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) in the accompanying condensed consolidated balance sheets.

As of December 31, 2020 and June 30, 2021, the Company’s contract balances were as follows (in thousands):

	December 31,		June 30,
	2020		2021
Accounts receivable, net	$	61,784	$	66,497
Contract assets - current	$	729	$	741
Contract assets - non-current		3,998		3,757
Contract assets - total	$	4,727	$	4,498
Contract liabilities - current	$	1,638	$	1,006
Contract liabilities - non-current		59		—
Contract liabilities - total	$	1,697	$	1,006

Accounts Receivable, Net

"Accounts receivable, net" in the accompanying condensed consolidated balance sheets includes amounts billed and currently due from customers. The amounts due are stated at their net estimated realizable value. The Company maintains an allowance to provide for the estimated amount of receivables that will not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables, and economic conditions that may affect a customer’s ability to pay.

Contract Assets

Contract assets include unbilled amounts typically resulting from the Company’s station construction sale contracts, when the cost-to-cost method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the customer, and right to payment is not just subject to the passage of time. Amounts may not exceed their net realizable value. Contract assets are classified as current or noncurrent based on the timing of billings. The current portion is included in “Prepaid expenses and other current assets” and the noncurrent portion is included in “Notes receivable and other long-term assets, net” in the accompanying condensed consolidated balance sheets.

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Contract Liabilities

Contract liabilities consist of billings in excess of revenue recognized from the Company’s station construction sale contracts and payments received primarily from customers of NG Advantage, LLC (“NG Advantage”) in advance of the performance obligations and are classified as current or noncurrent based on when the related revenue is expected to be recognized. The current portion and noncurrent portion of contract liabilities are included in “Deferred revenue” and “Other long-term liabilities,” respectively, in the accompanying condensed consolidated balance sheets.

Revenue recognized during the six months ended June 30, 2020 related to the Company’s contract liability balances as of December 31, 2019 was $4.2 million. The decrease in the contract liability balances for the six months ended June 30, 2021 is primarily driven by $1.5 million of revenue recognized related to the Company’s contract liability balances as of December 31, 2020, offset by billings in excess of revenue recognized.

Note 3— Investments in Other Entities and Noncontrolling Interest in a Subsidiary

Total Joint Venture

On March 3, 2021, the Company entered an agreement (“Total JV Agreement”) with Total S.E. (“Total”) that created a 50/50 joint venture (“Total JV”) to develop anaerobic digester gas (“ADG”) RNG production facilities in the United States. The Total JV Agreement contemplates that the Total JV will invest up to $400.0 million of equity in production projects, and Total and the Company each committed to initially provide $50.0 million for the Total JV (the “Total JV Equity Obligations”). To fund the Company’s Total JV Equity Obligations the Company has the option to borrow $20.0 million from Société Générale, a company incorporated as a société anonyme under the laws of France (“SG”), pursuant to the Credit Agreement (defined in Note 12). See Note 12 for additional information.

bp Joint Venture

On April 13, 2021, the Company entered an agreement (“bp JV Agreement”) with BP Products North America Inc. (“bp”) that created a 50/50 joint venture (“bpJV”) to develop, own and operate new ADG RNG production facilities in the United States. Pursuant to the bp JV Agreement, bp and the Company committed to provide $50.0 million and $30.0 million, respectively, with bp and the Company each receiving 30.0 million of Class A Units  in the bpJV and bp also receiving 20.0 million of Class B Units in the bpJV. bp’s initial $50.0 million contribution was made on April 13, 2021 and consisted of all unpaid principal outstanding under the loan agreement dated December 18, 2020 (see Note 12), pursuant to which bp advanced $50.0 million to the Company to fund capital costs and expenses incurred prior to formation of the bpJV, including capital costs and expenses for permitting, engineering, equipment, leases and feed stock rights. 100% of the RNG produced from the projects developed and owned by the bpJV will be provided to the vehicle fuels market pursuant to the Company’s marketing agreement with bp.

Pursuant to the bp JV Agreement, the Company had the option, exercisable prior to August 31, 2021 (the “bp Option”), to commit an additional $20.0 million to the bpJV upon which bp’s Class B Units convert into Class A Units. On June 21, 2021, the Company contributed $50.2 million to the bpJV, which consisted of (i) its initial contribution commitment of $30.0 million, (ii) the $20.0 million additional contribution to effect the conversion of bp’s Class B Units into Class A Units pursuant to the Company’s exercise of the bp Option, and (iii) $0.2 million for interest on bp’s Class B units to acquire additional Class A Units. As of June 30, 2021, the Company and bp each own 50% of the bp JV.

The Company accounts for its interest in the bpJV using the equity method of accounting because the Company does not control but has the ability to exercise significant influence over the bpJV’s operations. The Company recorded a loss of $0.1 million from this investment for the three and six months ended June 30, 2021 related to formation expenses. The Company had an investment balance in the bpJV of $50.0 million as of June 30, 2021.

SAFE&CEC S.r.l.

On November 26, 2017, the Company, through its former subsidiary IMW Industries Ltd. (formerly known as Clean Energy Compression Corp.) (“CEC”), entered into an investment agreement with Landi Renzo S.p.A. (“LR”), an

11

alternative fuels company based in Italy. Pursuant to the investment agreement, the Company and LR agreed to combine their respective natural gas compressor fueling systems manufacturing subsidiaries, CEC and SAFE S.p.A, in a new company, SAFE&CEC S.r.l. (such combination transaction is referred to as the “CEC Combination”). SAFE&CEC S.r.l. is focused on manufacturing, selling and servicing natural gas fueling compressors and related equipment for the global natural gas fueling market. As of the closing of the CEC Combination on December 29, 2017, the Company owns 49% of SAFE&CEC S.r.l., and LR owns 51% of SAFE&CEC S.r.l.

The Company accounts for its interest in SAFE&CEC S.r.l. using the equity method of accounting because the Company does not control but has the ability to exercise significant influence over SAFE&CEC S.r.l.’s operations. The Company recorded a loss of $0.5 million and a gain of $0.5 million from this investment for the three months ended June 30, 2020 and 2021, respectively, and a loss of $0.4 million and a gain of $0.1 million for the six months ended June 30, 2020 and 2021, respectively. The Company had an investment balance in SAFE&CEC S.r.l. of $24.7 million and $24.5 million as of December 31, 2020 and June 30, 2021, respectively.

NG Advantage

On October 14, 2014, the Company entered into a Common Unit Purchase Agreement (“UPA”) with NG Advantage for a 53.3% controlling interest in NG Advantage. NG Advantage is engaged in the business of transporting CNG in high-capacity trailers to industrial and institutional energy users, such as hospitals, food processors, manufacturers and paper mills that do not have direct access to natural gas pipelines. As of June 30, 2021, the Company’s controlling interest in NG Advantage was 93.3%.

The Company recorded a loss attributable to the noncontrolling interest in NG Advantage of $0.3 million for each of the three months ended June 30, 2020 and 2021, and $1.1 million and $0.6 million for the six months ended June 30, 2020 and 2021, respectively. The value of the noncontrolling interest was $9.3 million and $8.8 million as of December 31, 2020 and June 30, 2021, respectively.

Note 4—Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents and restricted cash as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Current assets:
Cash and cash equivalents	$	108,977	$	134,041
Total cash and cash equivalents	$	108,977	$	134,041
Long-term assets:
Restricted cash - standby letters of credit	$	4,000	$	—
Restricted cash - held as collateral		7,000		7,004
Total restricted cash	$	11,000	$	7,004
Total cash, cash equivalents and restricted cash	$	119,977	$	141,045

The Company considers all highly liquid investments with maturities of three months or less on the date of acquisition to be cash equivalents.

The Company places its cash and cash equivalents with high credit quality financial institutions. At times, such balances may be in excess of the Federal Deposit Insurance Corporation (“FDIC”) and Canadian Deposit Insurance Corporation (“CDIC”) limits. Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash deposits. The amounts in excess of FDIC and CDIC limits were approximately $107.6 million and $132.7 million as of December 31, 2020 and June 30, 2021, respectively.

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The Company classifies restricted cash as short-term and a current asset if the cash is expected to be used in operations within a year or to acquire a current asset. Otherwise, the restricted cash is classified as long-term.

Note 5—Short-Term Investments

Short-term investments include available-for-sale debt securities and certificates of deposit. Available-for-sale debt securities are carried at fair value, inclusive of unrealized gains and losses. Unrealized gains and losses on available-for-sale debt securities are recognized in other comprehensive income (loss), net of applicable income taxes. Gains or losses on sales of available-for-sale debt securities are recognized on the specific identification basis.

The Company reviews available-for-sale debt securities for declines in fair value below their cost basis each quarter and whenever events or changes in circumstances indicate that the cost basis of an asset may not be recoverable, and evaluates the current expected credit loss. This evaluation is based on a number of factors, including historical experience, market data, issuer-specific factors, economic conditions, and any changes to the credit rating of the security. As of June 30, 2021, the Company has not recorded a credit loss related to available-for-sale debt securities and believes the carrying values for its available-for-sale debt securities are properly recorded.

Short-term investments as of December 31, 2020 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Gain (Loss)		Fair Value
Municipal bonds and notes	$	28,998	$	—	$	28,998
Certificates of deposit		530		—		530
Total short-term investments	$	29,528	$	—	$	29,528

Short-term investments as of June 30, 2021 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Loss		Fair Value
Municipal bonds and notes	$	2,027	$	(1)	$	2,026
Zero coupon bonds		117,654		(2)		117,652
Certificates of deposit		530		—		530
Total short-term investments	$	120,211	$	(3)	$	120,208

Note 6 - Derivative Instruments and Hedging Activities

In October 2018, the Company executed two commodity swap contracts with Total Gas & Power North America, an affiliate of Total and THUSA (as defined in Note 12), for a total of 5.0 million diesel gallons annually from April 1, 2019 to June 30, 2024. These commodity swap contracts are used to manage diesel price fluctuation risks related to the natural gas fuel supply commitments the Company makes in its fueling agreements with fleet operators that participate in the Zero Now truck financing program. These contracts are not designated as accounting hedges and as a result, changes in the fair value of these derivative instruments are recognized in "Product revenue" in the accompanying condensed consolidated statements of operations.

The Company has entered into fueling agreements with fleet operators under the Zero Now truck financing program. The fueling agreements contain a pricing feature indexed to diesel, which the Company determined to be embedded derivatives and recorded at fair value at the time of execution, with the changes in fair value of the embedded derivatives recognized in "Product revenue" in the accompanying condensed consolidated statements of operations.

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Derivatives and embedded derivatives as of December 31, 2020 consisted of the following (in thousands):

	Gross Amounts		Gross Amounts		Net Amount
	Recognized		Offset		Presented
Assets:
Commodity swaps:
Current portion of derivative assets, related party	$	1,591	$	—	$	1,591
Long-term portion of derivative assets, related party		4,057		—		4,057
Fueling agreements:
Prepaid expenses and other current assets		249		—		249
Notes receivable and other long-term assets, net		542		—		542
Total derivative assets	$	6,439	$	—	$	6,439
Liabilities:
Fueling agreements:
Accrued liabilities	$	283	$	—	$	283
Other long-term liabilities		273		—		273
Total derivative liabilities	$	556	$	—	$	556

Derivatives and embedded derivatives as of June 30, 2021 consisted of the following (in thousands):

	Gross Amounts		Gross Amounts		Net Amount
	Recognized		Offset		Presented
Assets:
Commodity swaps:
Long-term portion of derivative assets, related party	$	263	$	(263)	$	—
Fueling agreements:
Prepaid expenses and other current assets		1,399		—		1,399
Notes receivable and other long-term assets, net		3,670		—		3,670
Total derivative assets	$	5,332	$	(263)	$	5,069
Liabilities:
Commodity swaps:
Current portion of derivative liabilities, related party	$	709	$	—	$	709
Long-term portion of derivative liabilities, related party		1,247		(263)		984
Total derivative liabilities	$	1,956	$	(263)	$	1,693

As of December 31, 2020 and June 30, 2021, the Company had a total volume on open commodity swap contracts of 16.9 million and 14.4 million diesel gallons, respectively, at a weighted-average price of approximately $3.18 per gallon.

The following table reflects the weighted-average price of open commodity swap contracts as of December 31, 2020 and June 30, 2021, by year with associated volumes:

	December 31, 2020			June 30, 2021
	Volumes	Weighted-Average Price per		Volumes	Weighted-Average Price per
Year	(Diesel Gallons)	Diesel Gallon		(Diesel Gallons)	Diesel Gallon
2021	5,000,000	$	3.18	2,500,000	$	3.18
2022	5,000,000	$	3.18	5,000,000	$	3.18
2023	5,000,000	$	3.18	5,000,000	$	3.18
2024	1,875,000	$	3.18	1,875,000	$	3.18

Note 7—Fair Value Measurements

The Company follows the authoritative guidance for fair value measurements with respect to assets and liabilities that are measured at fair value on a recurring basis and non-recurring basis. Under the standard, fair value is defined as the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction

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between market participants, as of the measurement date. The standard also establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available in the circumstances. The hierarchy consists of the following three levels: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly; and Level 3 inputs are unobservable inputs for the asset or liability. Categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The Company’s available-for-sale debt securities and certificates of deposit are classified within Level 2 because they are valued using the most recent quoted prices for identical assets in markets that are not active and quoted prices for similar assets in active markets.

The Company used the income approach to value its outstanding commodity swap contracts and embedded derivatives in its fueling agreements under the Zero Now truck financing program (see Note 6). Under the income approach, the Company used a discounted cash flow (“DCF”) model in which cash flows anticipated over the term of the contracts are discounted to their present value using an expected discount rate. The discount rate used for cash flows reflects the specific risks in spot and forward rates and credit valuation adjustments. This valuation approach is considered a Level 3 fair value measurement. The significant unobservable inputs used in the fair value measurement of the Company’s derivative instruments are Ultra-Low Sulfur Diesel (“ULSD”) forward prices and differentials from ULSD to Petroleum Administration for Defense District (“PADD”) regions. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the ULSD forward prices is accompanied by a directionally opposite but less extreme change in the ULSD-PADD differential.

The Company estimated the fair value of its outstanding commodity swap contracts based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

The Company estimated the fair value of embedded derivatives in its fueling agreements under the Zero Now truck financing program based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

There were no transfers of assets or liabilities between Level 1, Level 2, or Level 3 of the fair value hierarchy as of December 31, 2020 or June 30, 2021.

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The following tables provide information by level for assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2020 and June 30, 2021 (in thousands):

	December 31, 2020		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities (1):
Municipal bonds and notes	$	28,998	$	—	$	28,998	$	—
Certificates of deposit (1)		530		—		530		—
Commodity swap contracts (2)		5,648		—		—		5,648
Embedded derivatives (3)		791		—		—		791
Liabilities:
Embedded derivatives (3)	$	556	$	—	$	—	$	556

	June 30, 2021		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities (1):
Municipal bonds and notes	$	2,026	$	—	$	2,026	$	—
Zero coupon bonds		117,652		—		117,652		—
Certificates of deposit (1)		530		—		530		—
Embedded derivatives (3)		5,069		—		—		5,069
Liabilities:
Commodity swap contracts (2)	$	1,693	$	—	$	—	$	1,693

(1) Included in "Short-term investments" in the accompanying condensed consolidated balance sheets. See Note 5 for more information.

(2) Included in "Derivative assets, related party" and "Long-term portion of derivative assets, related party" as of December 31, 2020, and "Derivative liabilities, related party" and "Long-term portion of derivative liabilities, related party" as of June 30, 2021 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.

(3) Included in "Prepaid expenses and other current assets," “Notes receivable and other long-term assets, net," “Accrued liabilities” and “Other long-term liabilities” as of December 31, 2020, and "Prepaid expenses and other current assets" and “Notes receivable and other long-term assets, net" as of June 30, 2021 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.

The following tables provide a reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis as shown in the tables above that used significant unobservable inputs (Level 3), as well as the change in unrealized gains or losses for the periods included in earnings (in thousands):

	Assets:		Assets:		Liabilities:		Liabilities:
	Commodity		Embedded		Commodity		Embedded		Liabilities:
	Swap Contracts		Derivatives		Swap Contracts		Derivatives		Warrants
Balance as of March 31, 2020	$	12,545	$	143	$	—	$	(3,308)	$	(445)
Settlements, net		(453)		—		—		—		—
Total gain (loss)		(2,349)		(49)		—		1,384		445
Balance as of June 30, 2020	$	9,743	$	94	$	—	$	(1,924)	$	—
Balance as of March 31, 2021	$	1,347	$	2,521	$	—	$	(30)	$	—
Settlements, net		—		—		310		—		—
Total gain (loss)		(1,347)		2,548		(2,003)		30		—
Balance as of June 30, 2021	$	—	$	5,069	$	(1,693)	$	—	$	—
Change in unrealized gain (loss) for the three months ended June 30, 2020 included in earnings	$	(2,802)	$	(49)	$	—	$	1,384	$	445
Change in unrealized gain (loss) for the three months ended June 30, 2021 included in earnings	$	(1,347)	$	2,548	$	(1,693)	$	30	$	—

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	Assets:		Assets:		Liabilities:		Liabilities:
	Commodity		Embedded		Commodity		Embedded		Liabilities:
	Swap Contracts		Derivatives		Swap Contracts		Derivatives		Warrants
Balance as of December 31, 2019	$	3,270	$	723	$	(164)	$	(81)	$	(40)
Settlements, net		(477)		—		56		—		—
Total gain (loss)		6,950		(629)		108		(1,843)		40
Balance as of June 30, 2020	$	9,743	$	94	$	—	$	(1,924)	$	—
Balance as of December 31, 2020	$	5,648	$	791	$	—	$	(556)	$	—
Settlements, net		(225)		—		349		—		—
Total gain (loss)		(5,423)		4,278		(2,042)		556		—
Balance as of June 30, 2021	$	—	$	5,069	$	(1,693)	$	—	$	—
Change in unrealized gain (loss) for the six months ended June 30, 2020 included in earnings	$	6,473	$	(629)	$	164	$	(1,843)	$	40
Change in unrealized gain (loss) for the six months ended June 30, 2021 included in earnings	$	(5,648)	$	4,278	$	(1,693)	$	556	$	—

Other Financial Assets and Liabilities

The carrying amounts of the Company’s cash, cash equivalents and restricted cash, receivables and payables approximate fair value due to the short-term nature of those instruments. The carrying amounts of the Company’s debt instruments approximated their respective fair values as of December 31, 2020 and June 30, 2021. The fair values of these debt instruments were estimated using a DCF analysis based on interest rates offered on loans with similar terms to borrowers of similar credit quality, which are Level 3 inputs. See Note 12 for more information about the Company’s debt instruments.

Note 8—Other Receivables

Other receivables as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Loans to customers to finance vehicle purchases	$	394	$	402
Accrued customer billings		6,335		6,527
Fuel tax credits		10,556		5,335
Other		6,370		2,595
Total other receivables	$	23,655	$	14,859

Note 9—Inventory

Inventory consists of raw materials and spare parts, work in process and finished goods and is stated at the lower of cost (first-in, first-out) or net realizable value. The Company evaluates inventory balances for excess quantities and obsolescence by analyzing estimated demand, inventory on hand, sales levels and other information, and reduces inventory balances to net realizable value for excess and obsolete inventory based on this analysis.

Inventory as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Raw materials and spare parts	$	28,100	$	27,968
Total inventory	$	28,100	$	27,968

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Note 10—Land, Property and Equipment

Land, property and equipment, net as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Land	$	3,476	$	3,476
LNG liquefaction plants		94,633		94,633
Station equipment		344,839		346,594
Trailers		79,860		77,437
Other equipment		89,276		90,212
Construction in progress		73,272		76,212
		685,356		688,564
Less accumulated depreciation		(394,445)		(413,878)
Total land, property and equipment, net	$	290,911	$	274,686

Included in "Land, property and equipment, net" are capitalized software costs of $32.3 million and $33.2 million as of December 31, 2020 and June 30, 2021, respectively. Accumulated amortization of the capitalized software costs is $28.8 million and $29.7 million as of December 31, 2020 and June 30, 2021, respectively.

The Company recorded amortization expense related to capitalized software costs of $0.6 million and $0.4 million for the three months ended June 30, 2020 and 2021, respectively, and $1.3 million and $0.9 million for the six months ended June 30, 2020 and 2021, respectively.

As of June 30, 2020 and 2021, $1.5 million and $0.9 million, respectively, is included in "Accounts payable" and "Accrued liabilities," which amounts are related to purchases of property and equipment. These amounts are excluded from the accompanying condensed consolidated statements of cash flows as they are non-cash investing activities.

Note 11—Accrued Liabilities

Accrued liabilities as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Accrued alternative fuels incentives (1)	$	18,175	$	17,911
Accrued employee benefits		4,282		3,754
Accrued gas and equipment purchases		9,897		9,847
Accrued interest		512		411
Accrued property and other taxes		3,094		3,385
Accrued salaries and wages		7,646		4,197
Embedded derivatives		283		—
Other (2)		8,748		10,846
Total accrued liabilities	$	52,637	$	50,351

(1) Includes the amount of RINs, LCFS Credits and the amount of AFTC payable to third parties.

(2) No individual item in “Other” exceeds 5% of total current liabilities.

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Note 12—Debt

Debt obligations as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31, 2020
			Unamortized Debt		Balance, Net of
	Principal Balance		Financing Costs		Financing Costs
bp Loan	$	50,000	$	—	$	50,000
NG Advantage debt		29,535		117		29,418
SG Facility		5,100		—		5,100
Other debt		1,162		—		1,162
Total debt		85,797		117		85,680
Less amounts due within one year		(3,631)		(39)		(3,592)
Total long-term debt	$	82,166	$	78	$	82,088

	June 30, 2021
			Unamortized Debt		Balance, Net of
	Principal Balance		Financing Costs		Financing Costs
NG Advantage debt	$	27,861	$	86	$	27,775
SG Facility		9,500		—		9,500
Other debt		983		—		983
Total debt		38,344		86		38,258
Less amounts due within one year		(8,718)		(29)		(8,689)
Total long-term debt	$	29,626	$	57	$	29,569

SG Credit Agreement

On January 2, 2019, the Company entered into a term credit agreement (the “Credit Agreement”) with SG. The Credit Agreement provides for a term loan facility (the “SG Facility”) pursuant to which the Company may obtain, subject to certain conditions, up to $100.0 million of loans (“SG Loans”) in support of its Zero Now truck financing program. Under the Credit Agreement, the Company is permitted to use the proceeds from the SG Loans to fund the incremental cost of trucks purchased or financed under the Zero Now truck financing program and related fees and expenses incurred by the Company in connection therewith. On March 12, 2021, the Credit Agreement was amended to permit the Company to use up to $45.0 million of proceeds from the SG Loans to fund certain station build costs, and up to $20.0 million to fund Total JV Equity Obligations. Interest on outstanding SG Loans accrues at a rate equal to LIBOR plus 1.30% per annum, and a commitment fee on any unused portion of the SG Facility accrues at a rate equal to 0.39% per annum. Interest and commitment fees are payable quarterly.

The Company is required to make quarterly principal payments of $2.5 million beginning March 31, 2022 with any unpaid amount due on January 2, 2024, subject to the option to extend the maturity date for three successive terms of one year each. The Company is required to make mandatory prepayments under the SG Facility equal to any amounts the Company receives for complete or partial refunds of the incremental cost of trucks purchased or financed under the Zero Now program, and the Company is generally permitted to make complete or partial voluntary prepayments under the SG Facility with prior written notice to SG without premium or penalty. The Credit Agreement includes certain representations, warranties and covenants by the Company and also provides for customary events of default which, if any of them occurs, would permit or require, among other things, the principal and accrued interest on the SG Loans to become or to be declared due and payable. Events of default under the Credit Agreement include, among others, nonpayment of principal and interest when due; violation of covenants; any default by the Company (whether or not resulting in acceleration) under any other agreement for borrowed money in excess of $20.0 million; voluntary or involuntary bankruptcy; repudiation or assignment of the Guaranty by THUSA; or a change of control of the Company.

The Credit Agreement does not include financial covenants, and the Company has not provided SG with any security for its obligations under the Credit Agreement. As described below, THUSA has entered into the Guaranty to guarantee the Company’s payment obligations to SG under the Credit Agreement. As of June 30, 2021, the Company had $9.5 million outstanding on the SG Facility, and no events of defaults had occurred.

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Total Credit Support Agreement

The Company entered into a credit support agreement with Total Holdings USA Inc. (“THUSA”), a wholly owned subsidiary of Total, on January 2, 2019, which was subsequently amended on March 12, 2021 (as amended, the “CSA”) in conjunction with the March 12, 2021 amendment to the Credit Agreement. Under the CSA, THUSA agreed to enter into a guaranty agreement (“Guaranty”) pursuant to which it has guaranteed the Company’s obligation to repay to SG up to $100.0 million in SG Loans and interest thereon in accordance with the Credit Agreement. In consideration for the commitments of THUSA under the CSA, the Company is required to pay THUSA a quarterly guaranty fee at a rate per quarter equal to 2.5% of the average aggregate SG Loan amount for the preceding calendar quarter.

Following any payment by THUSA to SG under the Guaranty, the Company would be obligated to immediately pay to THUSA the full amount of such payment plus interest on such amount at a rate equal to LIBOR plus 1.0%. In addition, the Company would be obligated to pay and reimburse THUSA for all reasonable out-of-pocket expenses it incurs in the performance of its services under the CSA, including all reasonable out-of-pocket attorneys’ fees and expenses incurred in connection with the payment to SG under the Guaranty or any enforcement or attempt to enforce any of the Company‘s obligations under the CSA. The CSA includes customary representations and warranties and affirmative and negative covenants by the Company. In addition, upon the occurrence of a “Trigger Event” and during its continuation, THUSA may, among other things: elect not to guarantee additional SG Loans; declare all or any portion of the outstanding amounts the Company owes THUSA under the CSA to be due and payable; and exercise all other rights it may have under applicable law. Each of the following events constitutes a Trigger Event: the Company defaults with respect to any payment obligation under the CSA; any representation or warranty made by the Company in the CSA was false, incorrect, incomplete or misleading in any material respect when made; the Company fails to observe or perform any material covenant, obligation, condition or agreement in the CSA; or the Company defaults in the observance or performance of any agreement, term or condition contained in any other agreement with THUSA or an affiliate of THUSA.

As security for the Company’s obligations under the CSA, on January 2, 2019, the Company entered into a pledge and security agreement with THUSA and delivered a collateral assignment of contracts to THUSA, pursuant to which the Company collaterally assigned to THUSA all fueling agreements it enters into with participants in the Zero Now truck financing program. In addition, on January 2, 2019, the Company entered into a lockbox agreement with THUSA and PlainsCapital Bank, under which the Company granted THUSA a security interest in the cash flow generated by the fueling agreements the Company enters into with participants in the Zero Now truck financing program.

Until the occurrence of a Trigger Event or Fundamental Trigger Event (as described below) under the CSA, the Company has the freedom to operate in the normal course, and there are no restrictions on the flow of funds in and out of the lockbox account established pursuant to the lockbox agreement. Upon the occurrence of a Trigger Event under the CSA, all funds in the lockbox account will be: first, used to make scheduled debt repayments under the Credit Agreement; and second, released to the Company. Further, upon the occurrence of a “Fundamental Trigger Event” under the CSA and during its continuation, in addition to exercising any of the remedies available to THUSA upon the occurrence of a Trigger Event as described above: all participants in the Zero Now program would pay amounts owed under their fueling agreements with the Company directly into the lockbox account; under a “sweep” mechanism, all cash in the lockbox account would be used to prepay all outstanding SG Loans under the Credit Agreement; no other disbursements from the lockbox account could be made without THUSA’s consent; THUSA would retain dominion over the lockbox account; and the funds in the account would remain as security for the Company’s payment and reimbursement obligations under the CSA. Each of the following events constitutes a Fundamental Trigger Event: the Company defaults in the observance or performance of any agreement, term or condition contained in the Credit Agreement that would constitute an event of default thereunder, up to or beyond any grace period provided in such agreement, unless waived by SG; the Company defaults in the observance or performance of any agreement, term or condition contained in any evidence of indebtedness other than the Credit Agreement, and the effect of such default is to cause, or permit the holders of such indebtedness to cause, acceleration of indebtedness in an aggregate amount for all such collective defaults of $20.0 million or more; voluntary and involuntary bankruptcy and insolvency events; and the occurrence of a change of control of the Company.

The CSA will terminate following the later of: the payment in full of all of the Company’s obligations under the CSA; and the termination or expiration of the Guaranty following the maturity date of the last outstanding SG Loan or December 31, 2023, whichever is earlier.

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NG Advantage Debt

On November 30, 2016, NG Advantage entered into a Loan and Security Agreement (the “Wintrust LSA”) with Wintrust Commercial Finance (“Wintrust”), pursuant to which Wintrust agreed to lend NG Advantage $4.7 million. The proceeds were primarily used to fund the purchases of CNG trailers and equipment. Interest and principal are payable monthly in 72 equal monthly installments at an annual rate of 5.17%. As collateral security for the prompt payment in full when due of NG Advantage’s obligations to Wintrust under the Wintrust LSA, NG Advantage pledged to and granted Wintrust a security interest in all of its right, title and interest in the CNG trailers and equipment purchased with the proceeds received under the Wintrust LSA.

On December 10, 2020, NG Advantage entered an Amended and Restated Loan and Security Agreement with Berkshire Bank (“Berkshire ALA”) to substitute and replace the two existing loans with Berkshire Bank dated May 12, 2016 and January 24, 2017 (collectively, the “Original Debt”). The Berkshire ALA provides NG Advantage a 5-year term loan of $14.5 million with payments of principal and interest due monthly beginning February 1, 2021 at an annual interest rate of 5%, maturing on January 1, 2026. NG Advantage used the funds provided by the Berkshire ALA to repay in full the outstanding principal balance plus accrued and unpaid interest of the Original Debt, and to repay the outstanding balances of certain other financing obligations to unrelated lenders. NG Advantage has pledged as collateral certain assets and equipment including trailers under the Berkshire ALA, and the Company has provided a limited guaranty of up to $7.0 million classified in “Restricted cash” on the accompanying condensed consolidated balance sheet. As of June 30, 2021, the Company was in compliance with the covenants under the Berkshire ALA.

The Berkshire ALA also provides NG Advantage a $1.0 million revolving line of credit which bears interest at the greater of the Prime Rate or 3.00%, plus 0.25% and has a maturity date of July 31, 2022. As of June 30, 2021, NG Advantage had $0.5 million outstanding on the revolving line of credit which is classified in “Long-term portion of debt” in the accompanying condensed consolidated balance sheet. As of June 30, 2021, the interest rate on the revolving line of credit was 3.50% (the Prime Rate (3.25% as of June 30, 2021) plus 0.25%).

Financing Obligations

NG Advantage has entered into sale and leaseback transactions with various lessors as described below. In each instance, the sale and leaseback transaction does not qualify for sale-leaseback accounting because of NG Advantage’s continuing involvement with the buyer-lessor due to a fixed price repurchase option. As a result, the transactions are recorded under the financing method, in which the assets remain on the accompanying condensed consolidated balance sheets and the proceeds from the transactions are recorded as financing liabilities.

On December 18, 2017, NG Advantage entered into a sale-leaseback arrangement through a Master Lease Agreement (the “BoA MLA”) with Bank of America Leasing & Capital, LLC (“BoA”). Pursuant to the BoA MLA, NG Advantage received $2.1 million in cash for CNG trailers and simultaneously leased them back from BoA for five years commencing January 1, 2018 with interest and principal payable in 60 equal monthly installments at an annual rate of 4.86%.

On March 1, 2018, NG Advantage entered into a sale-leaseback arrangement through a Master Lease Agreement (the “First National MLA”) with First National Capital, LLC (“First National”). Pursuant to the First National MLA, NG Advantage received $6.3 million in cash, net of fees and the first month’s lease payment for CNG trailers and simultaneously leased them back from First National for six years commencing March 1, 2018 with interest and principal payable in 72 equal monthly installments at an annual rate of 9.28%.

On December 20, 2018 (the “Closing Date”), NG Advantage entered into a purchase agreement to sell a compression station for a purchase price of $7.0 million to an entity whose member owners were noncontrolling interest member owners of NG Advantage. On the Closing Date and immediately following the consummation of the sale of the compression station, NG Advantage entered into a lease agreement with the buyer of the station pursuant to which the station was leased back to NG Advantage for a term of five years with monthly rent payments equal to $0.1 million at an annual rate of 12.0%.

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bp Loan

On December 18, 2020, the Company entered a Memorandum of Understanding (“MOU”) with bp to create the bpJV. Contemporaneous with the execution of the MOU, the Company and bp executed a loan agreement whereby bp advanced $50.0 million (“bp Loan”) to fund capital costs and expenses incurred prior to formation of the bpJV. The bp Loan bore interest at the rate per annum equal to LIBOR plus 4.33%. As repayment of the bp Loan, the outstanding principal balance was contributed to the bpJV in April 2021 upon entering into the bp JV Agreement. See Note 3 for additional information.

Plains Credit Facility

On May 1, 2021, the Company entered into a Loan and Security Agreement (the “Plains LSA”) with PlainsCapital Bank (“Plains”), which provides the Company a $20.0 million revolving line of credit through May 1, 2022. The interest rate on amounts outstanding under the Plains LSA is the greater of the Prime Rate or 3.25%. As of June 30, 2021, no amounts were  outstanding under the Plains LSA. As of June 30, 2021, the Company was in compliance with the covenants under the Plains LSA.

Other Debt

The Company has other debt due at various dates through 2024 bearing interest at rates up to 4.75% with a weighted-average interest rate of 4.38% and 4.37% as of December 31, 2020 and June 30, 2021, respectively.

Note 13—Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing the net income (loss) attributable to Clean Energy Fuels Corp. by the weighted-average number of common shares outstanding and common shares issuable for little or no cash consideration during the period. Diluted net income (loss) per share is computed by dividing the net income (loss) attributable to Clean Energy Fuels Corp. by the weighted-average number of common shares outstanding and common shares issuable for little or no cash consideration during the period and potentially dilutive securities outstanding during the period, and therefore reflects the dilution from common shares that may be issued upon exercise or conversion of these potentially dilutive securities, such as stock options, warrants, convertible notes and restricted stock units. The dilutive effect of stock awards and warrants is computed under the treasury stock method. The dilutive effect of convertible notes and restricted stock units is computed under the if-converted method. Potentially dilutive securities are excluded from the computations of diluted net income (loss) per share if their effect would be antidilutive.

The following table sets forth the computations of basic and diluted earnings (loss) per share for the three and six months ended June 30, 2020 and 2021 (in thousands except share and per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Net loss attributable to Clean Energy Fuels Corp.	$	(6,736)	$	(79,667)	$	(5,032)	$	(86,836)
Weighted-average common shares outstanding		200,670,137		207,047,221		202,831,346		203,043,580
Dilutive effect of potential common shares from restricted stock units and stock options		—		—		—		—
Weighted-average common shares outstanding - diluted		200,670,137		207,047,221		202,831,346		203,043,580
Basic and diluted loss per share	$	(0.03)	$	(0.38)	$	(0.02)	$	(0.43)

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The following potentially dilutive securities have been excluded from the diluted net income (loss) per share calculations because their effect would have been antidilutive. Although these securities were antidilutive for these periods, they could be dilutive in future periods.

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Stock options		9,654,436		9,028,347		9,654,436		9,028,347
Convertible notes		1,311,031		—		2,237,794		—
Restricted stock units		1,007,929		1,241,306		1,007,929		1,241,306
Amazon warrant shares		—		58,767,714		—		58,767,714
Total		11,973,396		69,037,367		12,900,159		69,037,367

Note 14—Stock-Based Compensation

The following table summarizes the compensation expense and related income tax benefit related to the Company’s stock-based compensation arrangements recognized in the accompanying condensed consolidated statements of operations during the three and six months ended June 30, 2020 and 2021 (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Stock-based compensation expense, net of $0 tax in 2020 and 2021	$	760	$	3,419	$	1,814	$	6,786

As of June 30, 2021, there was $26.3 million of total unrecognized compensation costs related to unvested shares subject to outstanding stock options and restricted stock units, which is expected to be expensed over a weighted-average period of approximately 2.05 years.

Amazon Warrant

On April 16, 2021, the Company entered into a Project Addendum to Fuel Pricing Agreement (“Fuel Agreement”) with Amazon Logistics, Inc., a subsidiary of Amazon.com, Inc. (“Amazon”), and a Transaction Agreement with Amazon (the “Transaction Agreement”), pursuant to which, among other things, the Company issued to Amazon.com NV Investment Holdings LLC, a subsidiary of Amazon (“Amazon Holdings”), a warrant to purchase up to an aggregate of 53,141,755 shares (the “Warrant Shares”) of common stock, par value $0.0001 per share, of the Company (the “Common Stock”) at an exercise price of $13.49 per share, which was a 21.3% premium to the $11.12 closing price of the Common Stock on April 15, 2021.

The Warrant Shares vest in multiple tranches, the first of which for 13,283,445 Warrant Shares vested upon execution of the Fuel Agreement. Subsequent tranches will vest over time based on fuel purchases by Amazon and its affiliates, up to a total of $500.0 million, excluding any payments attributable to “Pass Through Costs,” which consist of all costs associated with the delivered cost of gas and applicable taxes determined by reference to the selling price of gallons or gas sold.

Under the Transaction Agreement, the Company was required to use commercially reasonable efforts to obtain the approval of its stockholders with respect to the issuance of Warrant Shares in excess of 50,595,531 shares of Common Stock, pursuant to The Nasdaq Stock Market LLC’s Listing Rule 5635(b) (the “Stockholder Approval”). On June 14, 2021, the Company obtained Stockholder Approval.

As a result of the issuance of additional shares of Common Stock under the ATM Programs (see Note 15) and in accordance with the terms of the warrant, on June 14, 2021, the number of shares of the Company’s Common Stock that may be purchased pursuant to the warrant, at an exercise price of $13.49 per share, increased by an aggregate of 5,625,959 shares (the “Additional Warrant Shares”). The Additional Warrant Shares vest in multiple tranches, the first of which for 1,406,490 Additional Warrant Shares vested on June 14, 2021. Subsequent tranches of the Additional Warrant Shares will

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vest over time based on fuel purchases by Amazon and its affiliates, consistent with the vesting schedule for the Warrant Shares as described above. The right to purchase Warrant Shares and Additional Warrant Shares (the “Amazon Warrant”) that have vested expires April 16, 2031.

Amazon Holdings may not exercise the Amazon Warrant to the extent such exercise would cause Amazon Holdings to beneficially own more than 4.999% of the number of shares of Common Stock outstanding immediately after giving effect to such exercise (excluding any unvested portion of the Amazon Warrant) (the “Beneficial Ownership Limitation”). Amazon Holdings may, however, waive or modify the Beneficial Ownership Limitation by providing written notice to the Company sixty-one (61) days before such waiver or modification becomes effective (or immediately upon written notice to the Company to the extent the Company is subject to certain acquisition transactions pursuant to a tender or exchange offer).

Non-cash stock-based sales incentive contra-revenue charges (“Amazon Warrant Charges”) associated with the Amazon Warrant are recognized as the customer fuels and vesting conditions become probable of being achieved, based on the grant date fair value of the warrants. The fair values of the Amazon Warrant were determined as of the grant date in accordance with ASC 718, Compensation – Stock Compensation, using the Black-Scholes option pricing model and the following assumptions:

	April 16, 2021	June 14, 2021
Dividend yield	0.0%	0.0%
Expected volatility	66.46%	67.97
Risk-free interest rate	1.59%	1.49%
Expected term in years	10.0	9.8

The volatility amounts used were estimated based on the Company’s historical volatility of the Company’s stock over a period matching the assumed term of the warrants. The expected terms used were based on the term of the warrants at the date of issuance. The risk-free interest rates used were based on the U.S. Treasury yield curve for the expected term of the warrant at the date of issuance.

The following table summarizes the Amazon Warrant activity for the six months ended June 30, 2021:

	Warrant
	Shares
Outstanding and unvested as of December 31, 2020	—
Granted	58,767,714
Vested	(14,689,935)
Outstanding and unvested as of June 30, 2021	44,077,779

As a result of the immediate vesting of Warrant Shares and Additional Warrant Shares, the Company recognized Amazon Warrant Charges of $76.6 million and a customer incentive asset of $38.4 million representing Amazon Warrant Charges associated with future contractually required minimum fuel purchases which will be recognized as the fuel is purchased.

During the three and six months ended June 30, 2021, Amazon Warrant Charges in the condensed consolidated statements of operations were $78.1 million, which included $76.6 million from the immediate vesting and $1.5 million associated with fuel purchases. As of June 30, 2021, the Company had a customer incentive asset of $2.4 million and $35.4 million, classified in “Prepaid expenses and other current assets” and “Notes receivable and other long-term assets, net,” respectively, in the accompanying condensed consolidated balance sheets.

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Note 15—Stockholders’ Equity

Authorized Shares

On June 14, 2021, the Company’s stockholders approved an increase in the number of shares of Common Stock the Company is authorized to issue from 304,000,000 to 454,000,000. As of June 30, 2021, the Company is authorized to issue 455,000,000 shares, of which 454,000,000 shares of capital stock are designated Common Stock and 1,000,000 shares are designated preferred stock.

At-The-Market Offerings

On May 10, 2021, the Company entered into an equity distribution agreement with Goldman Sachs & Co. LLC, as sales agent, to sell shares of the Company’s Common Stock having an aggregate offering price of up to $100.0 million in an at-the-market offering program (the “May ATM Program”). As of June 3, 2021, the Company sold 12,362,237 shares of Common Stock under the May ATM Program, which exhausted the May ATM Program. On June 7, 2021, the Company entered into a new equity distribution agreement with Goldman Sachs & Co. LLC, as sales agent, to sell additional shares of Common Stock having an aggregate offering price of up to $100.0 million in a new at-the-market offering program (the “June ATM Program” and, together with the May ATM Program, the “ATM Programs”). On June 8, 2021, the Company sold 10,473,946 shares of Common Stock under the June ATM Program which exhausted the June ATM Program.

During the three months ended June 30, 2021, the Company issued 22,836,183 shares of Common Stock under the ATM Programs for gross proceeds of $200.0 million, and incurred transaction costs of $6.5 million, including $6.0 million in commissions paid to Goldman Sachs & Co. LLC.

Share Repurchase Program

On March 12, 2020, the Company’s Board of Directors approved a share repurchase program of up to $30.0 million (exclusive of fees and commissions) of the Company’s outstanding common stock (the “Repurchase Program”). The Repurchase Program does not have an expiration date, and it may be suspended or discontinued at any time. As of June 30, 2021, the Company had utilized $14.5 million to repurchase 7,744,386 shares of common stock under the Repurchase Program. During the three and six months ended June 30, 2021, the Company did not repurchase any shares of its common stock. The Repurchase Program does not obligate the Company to acquire any specific number of shares. Repurchases under the Repurchase Program may be effected from time to time through open market purchases, privately negotiated transactions, structured or derivative transactions, including accelerated share repurchase transactions, or other methods of acquiring shares, in each case subject to market conditions, applicable securities laws and other relevant factors. Repurchases may also be made under Rule 10b5-1 plans.

Note 16—Income Taxes

The provision for income taxes for interim periods is determined using an estimate of the Company’s annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter, the Company updates the estimate of the annual effective tax rate, and if the estimated tax rate changes, a cumulative adjustment is recorded.

The Company’s income tax expense was $0.1 million for each of the three months ended June 30, 2020 and 2021, and $0.2 million and $0.1 million for the six months ended June 30, 2020 and 2021, respectively. Tax expense for all periods consists of taxes due on the Company’s U.S. and foreign operations. The effective tax rates for the three and six months ended June 30, 2020 and 2021 are different from the federal statutory tax rate primarily due to losses for which no tax benefit has been recognized.

The Company increased its unrecognized tax benefits in the six months ended June 30, 2021 by $2.3 million. This increase is primarily attributable to the portion of AFTC revenue recognized in the period attributed to the federal fuel tax the Company collected from its customers and deductions attributed to the unvested Amazon Warrant. The net interest incurred was immaterial for the three and six months ended June 30, 2020 and 2021.

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Note 17—Commitments and Contingencies

Environmental Matters

The Company is subject to federal, state, local and foreign environmental laws and regulations. The Company does not anticipate any expenditures to comply with such laws and regulations that would have a material effect on the Company’s consolidated financial position, results of operations or liquidity. The Company believes that its operations comply, in all material respects, with applicable federal, state, local and foreign environmental laws and regulations.

Litigation, Claims and Contingencies

The Company may become party to various legal actions that arise in the ordinary course of its business. The Company is also subject to audit by tax and other authorities for varying periods in various federal, state, local and foreign jurisdictions, and disputes may arise during the course of these audits. It is impossible to determine the ultimate liabilities that the Company may incur resulting from any of these lawsuits, claims, proceedings, audits, commitments, contingencies and related matters or the timing of these liabilities, if any. If these matters were to ultimately be resolved unfavorably, it is possible that such an outcome could have a material adverse effect upon the Company’s consolidated financial position, results of operations, or liquidity. The Company does not, however, anticipate such an outcome and believes the ultimate resolution of these matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations, or liquidity.

Note 18—Leases

Lessor Accounting

The Company leases fueling station equipment to customers pursuant to agreements that contain an option to extend and an end-of-term purchase option. Receivables from these leases are accounted for as finance leases, specifically sales-type leases, and are included in “Other receivables” and “Notes receivable and other long-term assets, net” in the accompanying condensed consolidated balance sheets.

The Company recognizes the net investment in the lease as the sum of the lease receivable and the unguaranteed residual value, both of which are measured at the present value using the interest rate implicit in the lease.

During each of the three months ended June 30, 2020 and 2021, the Company recognized $0.1 million in “Interest income” on its lease receivables. During each of the six months ended June 30, 2020 and 2021, the Company recognized $0.2 million in “Interest income” on its lease receivables.

The following schedule represents the Company’s maturities of lease receivables as of June 30, 2021 (in thousands):

Fiscal year:
2021	$	701
2022		1,182
2023		962
2024		962
2025		962
Thereafter		3,544
Total minimum lease payments		8,313
Less amount representing interest		(2,300)
Present value of lease receivables	$	6,013

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Note 19—Alternative Fuel Excise Tax Credit

Under separate pieces of U.S. federal legislation, the Company has been eligible to receive the AFTC for its natural gas vehicle fuel sales made between October 1, 2006 and June 30, 2021. The AFTC is equal to $0.50 per gasoline gallon equivalent of CNG that the Company sold as vehicle fuel, and $0.50 per diesel gallon of LNG that the Company sold as vehicle fuel in 2020 and 2021. AFTC is currently available for vehicle fuel sales made through December 31, 2021 and may not be reinstated for vehicle fuel sales made after December 31, 2021.

Based on the service relationship with its customers, either the Company or its customers claim the credit. The Company records its AFTC, if any, as revenue in its condensed consolidated statements of operations because the credits are fully payable to the Company and do not offset income tax liabilities. As such, the credits are not deemed income tax credits under the accounting guidance applicable to income taxes.

Note 20—Related Party Transactions

Total S.E.

During the three and six months ended June 30, 2020, the Company recognized revenue of $2.0 million and $2.6 million, respectively, related to RINs sold to Total and its affiliates in the ordinary course of business. During the three and six months ended June 30, 2021, the Company recognized revenue of $0.9 million and $1.6 million, respectively, related to RINs and LNG sold to Total and its affiliates in the ordinary course of business and settlements on commodity swap contracts (Note 6). As of December 31, 2020 and June 31, 2021, the Company had receivables from Total of $0.9 million and $0.5 million, respectively.

During the three and six months ended June 30, 2020, the Company paid Total $0.2 million and $0.4 million, respectively, for expenses incurred in the ordinary course of business. During the three and six months ended June 30, 2021, the Company paid Total $0.5 million and $1.0 million, respectively, for expenses incurred in the ordinary course of business, settlements on commodity swap contracts (Note 6), and the guaranty fee under the CSA (Note 12). As of December 31, 2020 and June 30, 2021, the amount due to Total was immaterial.

SAFE&CEC S.r.l.

During the three and six months ended June 30, 2020, the Company received $0.9 million and $1.0 million, respectively, from SAFE&CEC S.r.l. in the ordinary course of business. During the three and six months ended June 30, 2021, the Company received $0.0 million and $0.2 million, respectively, from SAFE&CEC S.r.l. in the ordinary course of business. As of December 31, 2020 and June 30, 2021, the Company had receivables from SAFE&CEC S.r.l. of $0.2 million and $0.0 million, respectively.

During the three and six months ended June 30, 2020, the Company paid SAFE&CEC S.r.l. $1.6 million and $2.8 million, respectively, for parts and equipment in the ordinary course of business. During the three and six months ended June 30, 2021, the Company paid SAFE&CEC S.r.l. $1.7 million and $2.5 million, respectively, for parts and equipment in the ordinary course of business. As of  December 31, 2020 and June 30, 2021, the Company had payables to SAFE&CEC S.r.l. of $0.9 million and $1.7 million, respectively.

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

The following Management’s Discussion and Analysis of Financial Condition and Results of Operations (this discussion, as well as discussions under the same heading in our other periodic reports, are referred to as the “MD&A”) should be read together with our unaudited condensed consolidated financial statements and the related notes included in this report, and all cross references to notes included in this MD&A refer to the identified note in such condensed consolidated financial statements. For additional context with which to understand our financial condition and results of operations, refer to the MD&A included in our Annual Report on Form 10-K for our fiscal year ended December 31, 2020, which was filed with the Securities and Exchange Commission (“SEC”) on March 9, 2021, as well as the audited consolidated financial statements and notes included therein (collectively, our “2020 Form 10-K”).

Cautionary Note Regarding Forward-Looking Statements

This MD&A and the other disclosures in this report contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statements are statements other than historical facts. These statements relate to future events or circumstances or our future performance, and they are based on our current assumptions, expectations and beliefs concerning future developments and their potential effect on our business. In some cases, you can identify forward-looking statements by the following words: “if,” “may,” “might,” “shall,” “will,” “can,” “could,” “would,” “should,” “expect,” “intend,” “plan,” “goal,” “objective,” “initiative,” “anticipate,” “believe,” “estimate,” “predict,” “project,” “forecast,” “potential,” “continue,” “ongoing” or the negative of these terms or other comparable terminology, although the absence of these words does not mean that a statement is not forward-looking. The forward-looking statements we make in this discussion include statements about, among other things, our future financial and operating performance, our growth strategies, including expectations regarding our delivery and sales of RNG and Environmental Credits (as defined below), and anticipated trends in our industry and our business.

The preceding list is not intended to be an exhaustive list of all topics addressed by our forward-looking statements. Although the forward-looking statements we make reflect our good faith judgment based on available information, they are only predictions. Accordingly, our forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our or our industry’s actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. Factors that might cause or contribute to such differences include, among others, those discussed under “Risk Factors” in Item 1A of this report, as such factors may be amended, supplemented or superseded from time to time by other reports we file with the SEC. In addition, we operate in a competitive and rapidly evolving industry in which new risks emerge from time to time, and it is not possible for us to predict all of the risks we may face. Nor can we assess the effect of all factors on our business or the extent to which any factor or combination of factors could cause actual results to differ from our expectations. As a result of these and other potential risks and uncertainties, our forward-looking statements should not be relied on or viewed as guarantees of future events.

All of our forward-looking statements in this report are made only as of the date of this document and, except as required by law, we undertake no obligation to update publicly any forward-looking statements for any reason, including to conform these statements to actual results or to changes in our expectations. You should, however, review the factors and risks we describe in the reports we will file from time to time with the SEC for the most recent information about our forward-looking statements and the risks and uncertainties related to these statements. We qualify all of our forward-looking statements by this cautionary note.

Overview

We are North America’s leading provider of the cleanest fuel for the transportation market, based on the number of stations operated and the amount of gasoline gallon equivalents (“GGEs”) of renewable natural gas ("RNG") and conventional natural gas delivered. Through our sales of RNG, which is derived from biogenic methane produced by the breakdown of organic waste, we help thousands of vehicles, from airport shuttles to city buses to waste and heavy-duty trucks, reduce their amount of climate-harming greenhouse gas from 60% to over 400% based on determinations by the California Air Resources Board (“CARB”), depending on the source of the RNG, while also reducing criteria pollutants

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such as Oxides of Nitrogen, or NOx. RNG is delivered as compressed natural gas ("CNG") and liquefied natural gas ("LNG").

As a clean energy solutions provider, we supply RNG and conventional natural gas, in the form of CNG and LNG, for medium and heavy-duty vehicles; design and build, as well as operate and maintain (“O&M”), public and private fueling stations in the United States and Canada; sell and service compressors and other equipment used in RNG production and at fueling stations; transport and sell RNG and conventional natural gas via “virtual” natural gas pipelines and interconnects; sell U.S. federal, state and local government credits (collectively, “Environmental Credits”) we generate by selling RNG as a vehicle fuel, including Renewable Identification Numbers (“RIN Credits” or “RINs”) under the federal Renewable Fuel Standard Phase 2 and credits under the California and the Oregon Low Carbon Fuel Standards (collectively, “LCFS Credits”); and obtain federal, state and local tax credits, grants and incentives.

At present, we see the best use of RNG is as a replacement for fossil-based fuel in the transportation sector. We believe the most attractive market for RNG is U.S. heavy duty Class 8 trucking; based on information from the American Trucking Association and our own internal estimates, we believe there are 3.9 million heavy duty trucks operating in the U.S. that use over 35 billion GGEs of diesel per year. We deliver RNG to the transportation market through 541 fueling stations we own, operate or supply in 41 states and the District of Columbia in the U.S., including over 200 stations in California. We also own, operate or supply 25 fueling stations in Canada.

Critically, to generate the valuable Environmental Credits the RNG must be placed in vehicle fuel tanks. We believe our stations and customer relationships allow us to deliver substantially more RNG to vehicle operators than any other participant in the market – we calculate that we have access to more fueling stations and vehicle fleets than all our competitors combined. As of June 30, 2021, we served over 1,000 fleet customers operating over 48,000 vehicles on our fuels.

Longer term, we expect to also be able to provide hydrogen fuel to vehicle fleets. As operators deploy more hydrogen powered vehicles, we can modify our fueling stations to reform our RNG and deliver clean hydrogen to customers. We also have the capability to add electric vehicle charging at our station sites, and we believe our RNG can be used to generate clean electricity to power electric vehicles.

Impact of COVID-19

The COVID-19 pandemic has had an adverse impact on the volume of our sales, which we saw bottom in the second quarter of 2020. We have since seen improvement in volumes, with volumes delivered for the second quarter of 2021 13% higher compared to the second quarter of 2020, and 2% higher compared to the second quarter of 2019. We saw significant improvement in our volumes delivered in the public transit customer markets and airports (fleet services), which increased by 24% and 36%, respectively, during the three months ended June 30, 2021, compared to the prior year period. The increase in volumes delivered in the second quarter of 2021 was primarily due to COVID-19 restrictions and “shelter-in-place” orders being lifted and an increase in travel generally.

Although we are experiencing gradual improvements since the onset of the COVID-19 pandemic, there is no guarantee this will continue due to uncertainties regarding the effects of the COVID-19 pandemic. It is possible that the prolonged effect of the COVID-19 pandemic could negatively affect our future volumes. Lower volumes since the onset of the COVID-19 pandemic have resulted in and could again result in lower gross margin dollars and likely a lower gross margin per GGE due to lower output on fixed operating costs and the effect of less revenue from Environmental Credits. Lower volumes have affected and may again affect our federal alternative fuel excise tax credit (“AFTC”) revenue as this leads to lower AFTC-eligible volumes. Given the dynamic nature of these circumstances, significant uncertainty exists concerning the duration of business disruption and the full extent of the effect of COVID-19 on our business, results of operations and financial condition. Additionally, the effects of COVID-19, low oil prices and the adoption of government policies and programs, or increased popular sentiment, in favor of other vehicle technologies or fuels may delay adoption of natural gas vehicles, particularly heavy-duty natural gas trucks, by new or existing customers. For more information, see “Risk Factors” in Part II, Item 1A of this report.

We believe we have sufficient liquidity to support business operations through this volatile period, including total

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cash and cash equivalents and short-term investments of $254.2 million as of June 30, 2021 and $8.7 million of current debt. We will also collect receivables related to the AFTC revenue in 2021 and the first half of 2022; we expect AFTC revenue to be approximately $20 million for 2021 after giving consideration to the effect of COVID-19 described above.

Performance Overview

This performance overview discusses matters on which our management focuses in evaluating our financial condition and our operating results.

Sources of Revenue

The following tables represent our sources of revenue:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Revenue (in millions)	2020		2021		2020		2021
Volume-related (1) (2)	$	50.2	$	(10.8)	$	125.3	$	57.3
Station construction sales		5.3		6.1		10.8		10.6
AFTC (3)		4.4		5.2		9.8		9.7
Total	$	59.9	$	0.5	$	145.9	$	77.6

(1) Our volume-related revenue primarily consists of sales of RNG and conventional natural gas, in the form of CNG and LNG, performance of O&M services, and sales of RINs and LCFS Credits in addition to changes in fair value of our derivative instruments. More information about our volume of fuel and O&M services delivered in the periods is included below under “Key Operating Data,” and more information about our derivative instruments, which consist of commodity swap and customer fueling contracts, is included in Note 6. The following table summarizes our volume-related revenue in the periods:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Revenue (in millions)	2020		2021		2020		2021
Fuel sales and performance of O&M services (2)	$	44.2	$	(21.8)	$	107.8	$	38.8
Change in fair value of derivative instruments		(1.5)		(0.5)		4.2		(2.5)
RIN Credits		2.9		8.2		5.4		13.8
LCFS Credits		4.6		3.3		7.9		7.2
Total volume-related revenue	$	50.2	$	(10.8)	$	125.3	$	57.3

(2) Includes $78.1 million of non-cash stock-based sales incentive contra-revenue charges related to the Amazon Warrant (as defined below), for the three and six months ended June 30, 2021.

(3) The AFTC is currently available for vehicle fuel sales made through December 31, 2021. AFTC may not be reinstated for vehicle fuel sales made after December 31, 2021.

Key Operating Data

In evaluating our operating performance, we focus primarily on: (1) the amount of RNG, CNG and LNG GGEs delivered (which we define as (i) the volume of GGEs we sell to our customers as fuel, plus (ii) the volume of GGEs dispensed at facilities we do not own but where we provide O&M services on a per-gallon or fixed fee basis, plus (iii) our proportionate share of the GGEs sold as CNG by our joint venture with Mansfield Ventures, LLC and Mansfield Clean Energy Partners, LLC (“MCEP”)), (2) our station construction cost of sales, (3) our gross margin (which we define as revenue minus cost of sales), and (4) net income (loss) attributable to us. The following tables present our key operating

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data for the years ended December 31, 2018, 2019 and 2020 and for the three and six months ended June 30, 2020 and 2021:

	Year Ended						Three Months Ended				Six Months Ended
	December 31,						June 30,				June 30,
GGEs delivered (in millions)	2018		2019		2020		2020		2021		2020		2021
CNG (1)		299.5		335.7		321.0		73.6		88.5		157.7		167.1
LNG		66.0		65.1		61.5		15.9		12.9		31.1		26.7
Total		365.5		400.8		382.5		89.5		101.4		188.8		193.8

RNG sold as vehicle fuel is included in the CNG or LNG amounts in the table above as applicable based on the form in which it was sold. GGEs of RNG sold as vehicle fuel for the years ended December 31, 2018, 2019 and 2020 and for the three and six months ended June 30, 2020 and 2021, were as follows:

	Year Ended						Three Months Ended				Six Months Ended
	December 31,						June 30,				June 30,
GGEs of RNG delivered (in millions)	2018		2019		2020		2020		2021		2020		2021
CNG		81.5		112.5		124.4		27.9		35.8		57.2		65.9
LNG		28.6		30.8		28.9		8.1		7.1		14.8		14.0
Total		110.1		143.3		153.3		36.0		42.9		72.0		79.9

	Year Ended						Three Months Ended				Six Months Ended
	December 31,						June 30,				June 30,
GGEs delivered (in millions)	2018		2019		2020		2020		2021		2020		2021
O&M services		157.3		158.5		138.5		32.2		38.1		66.4		73.2
Fuel (1)		133.6		162.4		157.6		36.8		40.3		79.5		77.8
Fuel and O&M services (2)		74.6		79.9		86.4		20.5		23.0		42.9		42.8
Total		365.5		400.8		382.5		89.5		101.4		188.8		193.8

RNG sold as vehicle fuel is included in the table above as applicable based on the services provided. GGEs of RNG sold as vehicle fuel for the years ended December 31, 2018, 2019 and 2020 and for the three and six months ended June 30, 2020 and 2021, were as follows:

	Year Ended						Three Months Ended				Six Months Ended
	December 31,						June 30,				June 30,
GGEs of RNG delivered (in millions)	2018		2019		2020		2020		2021		2020		2021
Fuel		64.3		87.3		86.2		21.9		23.6		43.2		42.8
Fuel and O&M services (2)		45.8		56.0		67.1		14.1		19.3		28.8		37.1
Total		110.1		143.3		153.3		36.0		42.9		72.0		79.9

	Year Ended						Three Months Ended				Six Months Ended
	December 31,						June 30,				June 30,
Other operating data (in millions)	2018		2019		2020		2020		2021		2020		2021
Station construction cost of sales	$	25.1	$	23.5	$	24.0	$	4.6	$	5.5	$	9.7	$	9.5
Gross margin (3) (4) (5)	$	133.5	$	132.0	$	106.3	$	21.3	$	(46.4)	$	54.4	$	(19.7)
Net income (loss) attributable to Clean Energy Fuels Corp. (3) (5)	$	(3.8)	$	20.4	$	(9.9)	$	(6.7)	$	(79.7)	$	(5.0)	$	(86.8)

(1) As noted above, amounts include our proportionate share of the GGEs sold as CNG by our joint venture with MCEP. GGEs sold by this joint venture were 0.5 million, 0.4 million and 0.3 million for the years ended December 31, 2018, 2019 and 2020, respectively, 0.1 million for each of the three months ended June 30, 2020 and 2021, and 0.2 million and 0.1 million for the six months ended June 30, 2020 and 2021, respectively.

(2) Represents GGEs at stations where we provide both fuel and O&M services.

(3) Includes the following amounts of AFTC revenue: $26.7 million, $47.1 million and $19.8 million for the years ended December 31, 2018, 2019 and 2020, respectively, $4.4 million and $9.8 million for the three and six months ended June 30, 2020, respectively, and $5.2 million and $9.7 million for the three and six months ended June 30, 2021, respectively.

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(4) Gross margin includes an unrealized gain (loss) from the change in fair value of commodity swap and customer fueling contracts of $10.3 million, $(6.6) million and $2.1 million for the years ended December 31, 2018, 2019 and 2020, respectively, $(1.5) million and $(0.5) million for the three months ended June 30, 2020 and 2021, respectively, and $4.2 million and $(2.5) million for the six months ended June 30, 2020 and 2021, respectively. See Note 6 for more information regarding the commodity swap and customer contracts.

(5) Includes $78.1 million of non-cash stock-based sales incentive contra-revenue charges related to the Amazon Warrant (as defined below), for the three and six months ended June 30, 2021.

Recent Developments

Total Joint Venture. On March 3, 2021, we entered an agreement (“Total JV Agreement”) with Total S.E. (“Total”) that created a 50/50 joint venture (“Total JV”) to develop anaerobic digester gas (“ADG”) RNG production facilities in the United States. The Total JV Agreement contemplates that the Total JV will invest up to $400.0 million of equity in production projects, and Total and the Company each committed to initially provide $50.0 million for the Total JV (the “Total JV Equity Obligations”). To fund our Total JV Equity Obligations, we have the option to borrow $20.0 million from Société Générale, a company incorporated as a société anonyme under the laws of France (“SG”), pursuant to the SG Credit Agreement (as defined below). See Note 12 for additional information. Total has also agreed to provide credit support of $65.0 million to support our development in the RNG value chain, including $45.0 million for contracted RNG fueling infrastructure.

SG Credit Agreement. On March 12, 2021, we amended the credit agreement (as amended, the “SG Credit Agreement”) with SG, to permit us to use up to $45.0 million of loan proceeds to fund certain station build costs and up to $20.0 million to fund Total JV Equity Obligations.

bp Joint Venture. On April 13, 2021, we entered an agreement (“bp JV Agreement”) with BP Products North America Inc. (“bp”) that created a 50/50 joint venture (“bpJV”) to develop, own and operate new ADG RNG production facilities in the United States. Pursuant to the bp JV Agreement, bp and the Company committed to provide $50.0 million and $30.0 million, respectively, with bp and the Company each receiving 30.0 million of Class A Units in the bpJV and bp also receiving 20.0 million of Class B Units in the bpJV. bp’s initial $50.0 million contribution was made on April 13, 2021 and consisted of all unpaid principal outstanding under the loan agreement dated December 18, 2020 (see Note 12), pursuant to which bp advanced us $50.0 million to fund capital costs and expenses incurred prior to formation of the bpJV, including capital costs and expenses for permitting, engineering, equipment, leases and feed stock rights. 100% of the RNG produced from the projects developed and owned by the bpJV will be provided to the vehicle fuels market pursuant to our existing marketing agreement with bp.

Pursuant to the bp JV Agreement, we had the option, exercisable prior to August 31, 2021 (the “bp Option”), to commit an additional $20.0 million to the bpJV upon which bp’s Class B Units convert into Class A Units. On June 21, 2021, we contributed $50.2 million consisting of our initial contribution commitment of $30.0 million, the $20.0 million additional contribution, plus $0.2 million of interest in accordance with the bp JV Agreement to effect the conversion of bp’s Class B Units into Class A Units.

Amazon. On April 16, 2021, we entered into a Project Addendum to Fuel Pricing Agreement (“Fuel Agreement”) with Amazon Logistics, Inc., a subsidiary of Amazon.com, Inc. (“Amazon”), and a Transaction Agreement with Amazon (the “Transaction Agreement”), pursuant to which, among other things, we issued to Amazon.com NV Investment Holdings LLC, a subsidiary of Amazon (“Amazon Holdings”) a warrant to purchase up to an aggregate of 53,141,755 shares (the “Warrant Shares”) of our common stock at an exercise price of $13.49 per share, which was a 21.3% premium to the $11.12 closing price of our common stock on April 15, 2021.

The Warrant Shares vest in multiple tranches, the first of which for 13,283,445 Warrant Shares vested upon execution of the Fuel Agreement. Subsequent tranches will vest over time based on fuel purchases by Amazon and its affiliates, up to a total of $500 million, excluding any payments attributable to “Pass Through Costs,” which consist of all costs associated with the delivered cost of gas and applicable taxes determined by reference to the selling price, gallons or gas sold. Importantly, in order for all the vesting conditions of the warrant to be satisfied, Amazon would have to purchase hundreds of millions of GGEs of RNG from us.

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Under the Transaction Agreement we were required to use commercially reasonable efforts to obtain the approval of our stockholders with respect to the issuance of Warrant Shares in excess of 50,595,531 shares of our common stock, pursuant to The Nasdaq Stock Market LLC’s Listing Rule 5635(b) (the “Stockholder Approval”). On June 14, 2021, we obtained the Stockholder Approval at our 2021 annual meeting of stockholders.

In accordance with the terms of the warrant, as a result of the issuance of shares of our common stock pursuant to the ATM Programs (as defined below), on June 14, 2021, the number of shares of our common stock that may be purchased pursuant to the warrant, at an exercise price of $13.29 per share, increased by an aggregate of 5,625,959 shares (the “Additional Warrant Shares”). The Additional Warrant Shares vest in multiple tranches, the first of which for 1,406,490 Additional Warrant Shares vested on June 14, 2021. Subsequent tranches of the Additional Warrant Shares will vest over time based on fuel purchases by Amazon and its affiliates, consistent with the vesting schedule for the Warrant Shares as described above. The right to purchase Warrant Shares and Additional Warrant Shares (the “Amazon Warrant”) that have vested expires April 16, 2031.

We believe our commercial partnership with Amazon will enhance our strategies, initiatives and efforts to achieve our goals to grow fleet and other consumer support for the use of RNG as a vehicle fuel for our target customers and geographies. We also believe the proceeds from the issuance of our common stock to Amazon in the event Amazon were to vest and then exercise the Amazon Warrant in part or as a whole for cash would enhance our liquidity in support of our operations, as well as our ability to execute our business plans and pursue opportunities for further growth. Accordingly, we believe securing this commercial partnership and incentiving Amazon to purchase the maximum amount of fuel under the Fuel Agreement is important for our business trajectory.

As a result of the immediate vesting of Warrant Shares and Additional Warrant Shares, we recognized non-cash stock-based sales incentive contra-revenue charges of $76.6 million and a customer incentive asset of $38.4 million representing Amazon Warrant Charges associated with future contractually required minimum fuel purchases which will be recognized as the fuel is purchased.

For the three and six months ended June 30, 2021, non-cash stock-based sales incentive contra-revenue charges (“Amazon Warrant Charges”) were $78.1 million, which included $76.6 million from the immediate vesting and $1.5 million associated with fuel purchases. As of June 30, 2021, we had a customer incentive asset of $2.4 million and $35.4 million, classified in “Prepaid expenses and other current assets” and “Notes receivable and other long-term assets, net,” respectively, in the accompanying condensed consolidated balance sheets.

Plains Credit Facility. On May 1, 2021, we entered into a Loan and Security Agreement (the “Plains LSA”) with PlainsCapital Bank (“Plains”) which provides us a $20.0 million revolving line of credit through May 1, 2022. The interest rate on amounts outstanding under the Plains LSA is the greater of the Prime Rate or 3.25%. As of June 30, 2021, no amounts were outstanding under the Plains LSA.

At-The-Market Offerings. On May 10, 2021, we entered into an equity distribution agreement with Goldman Sachs & Co. LLC, as sales agent, to sell shares of our common stock having an aggregate offering price of up to $100.0 million in an at-the-market offering program (the “May ATM Program”). As of June 3, 2021, we sold 12,362,237 shares of our common stock under the May ATM Program, which exhausted the May ATM Program. On June 7, 2021, we entered into a new equity distribution agreement with Goldman Sachs & Co. LLC, as sales agent, to sell additional shares of our common stock having an aggregate offering price of up to $100.0 million in a new at-the-market offering program (the “June ATM Program” and, together with the May ATM Program, the “ATM Programs”). On June 8, 2021, we sold 10,473,946 shares of our common stock under the June ATM Program, which exhausted the June ATM Program.

During the three months ended June 30, 2021, we issued 22,836,183 shares of our common stock under the ATM Programs for gross proceeds of $200.0 million, and incurred transaction costs of $6.5 million, including $6.0 million in commissions paid to Goldman Sachs & Co. LLC.

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Business Risks and Uncertainties and Other Trends

Our business and prospects are exposed to numerous risks and uncertainties. For more information, see “Risk Factors” in Part II, Item 1A of this report. In addition, our performance in any period may be affected by various trends in our business and our industry, including certain seasonality trends. See the description of the key trends in our past performance and anticipated future trends included in the MD&A contained in our 2020 Form 10-K. Except as set forth below, and in “Impact of COVID-19” above, there have been no material changes to such trends as described in the MD&A contained in our 2020 Form 10-K.

The market for our vehicle fuels is a relatively new and developing market, and has experienced slow, volatile or unpredictable growth in many sectors. For example, to date, adoption and deployment of natural gas vehicles, both in general and in certain of our key customer markets, including heavy-duty trucking, have been slower than we anticipated. Also, other important markets, including airports, refuse and public transit, had slower volume and customer growth in 2020 and in the six months ended June 30, 2021. Slower growth may continue, principally due to the COVID-19 pandemic and the efforts taken to reduce its spread.

Market prices for RINs and LCFS Credits can be volatile and unpredictable, and the prices for such credits can be subject to significant fluctuations. The value of RINs and LCFS Credits (derived from market prices) can materially affect our revenue. For example, from approximately the beginning of June 2019 to January 2020, market prices for RINs trended to historical lows. Although RIN prices have generally increased since late January 2020, prices have fluctuated significantly during 2021 and will likely continue to be volatile. Further, LCFS Credit prices have fluctuated significantly during 2021 and will likely continue to be volatile.

The market price of our common stock can be volatile and unpredictable. If a decline of our market capitalization were sustained we may need to perform goodwill impairment tests more frequently and it is possible that our goodwill could become impaired which could result in a material non-cash charge and adversely affect our results of operations.

Debt Compliance

Certain of the agreements governing our outstanding debt, which are discussed in Note 12, have financial and non-financial covenants with which we must comply. As of June 30, 2021, we were in compliance with all of these covenants.

Risk Management Activities

Our risk management activities are discussed in the MD&A contained in our 2020 Form 10-K. During the six months ended June 30, 2021, there were no material changes to these activities.

Critical Accounting Policies and Estimates

The preparation of our condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires the appropriate application of accounting policies, some of which require us to make estimates and assumptions that affect the amounts reported and related disclosures in our condensed consolidated financial statements. We base our estimates on historical experience and various assumptions that we believe are reasonable under the circumstances. To the extent there are differences between these estimates and actual results, our financial condition or results of operations could be materially affected.

Our critical accounting policies and the related judgments and estimates are discussed in the MD&A contained in our 2020 Form 10-K, except for the Amazon Warrant and our adoption of new guidance for income taxes effective January 1, 2021, which are described in Note 1. There have been no other material changes to our critical accounting policies as described in the MD&A contained in our 2020 Form 10-K.

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Recently Adopted and Recently Issued Accounting Standards

See Note 1 for a description of recently adopted accounting standards and recently issued accounting standards pending adoption.

Results of Operations

The table below presents, for each period indicated, each line item of our statements of operations data as a percentage of our total revenue for the period. Additionally, the narrative that follows provides a comparative discussion of certain of these line items between the periods indicated. Historical results are not indicative of the results to be expected in the current period or any future period.

Three Months Ended June 30, 2021 Compared to Three Months Ended June 30, 2020

	Three Months Ended
	June 30,
	2020		2021
Statements of Operations Data:
Revenue:
Product revenue	84.2	%	(1,867.7)	%
Service revenue	15.8		1,967.7
Total revenue	100.0		100.0
Operating expenses:
Cost of sales (exclusive of depreciation and amortization shown separately below):
Product cost of sales	55.2		8,602.9
Service cost of sales	9.2		1,170.2
Change in fair value of derivative warrants	(0.7)		—
Selling, general and administrative	28.2		4,501.3
Depreciation and amortization	20.1		2,371.0
Total operating expenses	112.0		16,645.4
Operating loss	(12.0)		(16,545.4)
Interest expense	(3.1)		(208.8)
Interest income	0.5		50.0
Other income, net	3.8		34.6
Income (loss) from equity method investments	(0.8)		25.2
Loss before income taxes	(11.6)		(16,644.4)
Income tax expense	(0.1)		(11.7)
Net loss	(11.7)		(16,656.1)
Loss attributable to noncontrolling interest	0.5		58.8
Net loss attributable to Clean Energy Fuels Corp.	(11.2)	%	(16,597.3)	%

Revenue. Revenue decreased by $59.4 million to $0.5 million in the three months ended June 30, 2021, from $59.9 million in the three months ended June 30, 2020. This decrease was primarily due to the Amazon Warrant Charges (see Note 1) of $78.1 million, partially offset by an increase in volume-related revenue, an increase in station construction sales and AFTC revenues, and a lower unrealized loss from the change in fair value of our commodity swap and customer contracts entered into in connection with our Zero Now truck financing program.

Volume-related revenue, excluding the effects of the change in fair value of our commodity swap and customer contracts entered in connection with our Zero Now truck financing program and the Amazon Warrant Charges, increased by $16.0 million between periods, attributable to an increase in gallons delivered and an increase in the effective price per gallon. The effect to volume-related revenue as a result of the change in fair value of our commodity swap and customer contracts entered into in connection with our Zero Now truck financing program was $1.0 million, as we recognized an

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unrealized loss of $(1.5) million in 2020 compared to an unrealized loss of $(0.5) million in 2021 (see Note 6 for more information).

Our effective price per gallon increased by $0.09 per gallon to $0.67 per gallon in the three months ended June 30, 2021, compared to $0.58 per gallon in the three months ended June 30, 2020, excluding the effects of the change in fair value of derivative instruments and Amazon Warrant Charges discussed above. Our effective price per gallon is defined as revenue generated from selling RNG and conventional natural gas, and any related Environmental Credits and providing O&M services to our vehicle fleet customers at stations we do not own and for which we receive a per-gallon or fixed fee, all divided by the total GGEs delivered less GGEs delivered by non-consolidated entities, such as entities that are accounted for under the equity method. The increase in our effective price per gallon was primarily due to higher RIN and natural gas prices, and a favorable fuel price mix, which is based on the variation of fuel types and locations where we deliver fuel.

Station construction sales increased by $0.8 million between periods due to increased construction activities.

AFTC revenue increased by $0.9 million between periods due to the increase in gallons sold during the three months ended June 30, 2021 compared to the three months ended June 30, 2020.

Cost of sales. Cost of sales increased by $8.3 million to $46.9 million in the three months ended June 30, 2021, from $38.6 million in the three months ended June 30, 2020. This increase was primarily due to an increase in gallons delivered, an increase in our effective cost per gallon delivered, and an increase in the cost of station construction activities.

Our effective cost per gallon increased by $0.03 per gallon to $0.41 per gallon in the three months ended June 30, 2021 from $0.38 per gallon in the three months ended June 30, 2020. Our effective cost per gallon is defined as the total costs associated with delivering our fuels, including commodity costs, transportation fees, liquefaction charges, and other site operating costs, plus the total cost of providing O&M services at stations that we do not own and for which we receive a per-gallon or fixed fee, including direct technician labor, indirect supervisor and management labor, repair parts and other direct maintenance costs, all divided by the total GGEs delivered less GGEs delivered by non-consolidated entities, such as entities that are accounted for under the equity method. The increase in our effective cost per gallon was due to higher commodity prices.

Change in fair value of derivative warrants. Change in fair value of derivative warrants, all of which were issued by our subsidiary, NG Advantage, decreased by $0.4 million to $0.0 million in the three months ended June 30, 2021, from $0.4 million in the three months ended June 30, 2020. The warrants expired unexercised on July 2, 2020.

Selling, general and administrative. Selling, general and administrative expenses increased by $4.7 million to $21.6 million in the three months ended June 30, 2021, from $16.9 million in the three months ended June 30, 2020. This increase was primarily driven by an increase in stock-based compensation expense due to equity awards granted during 2021 and our higher stock price.

Depreciation and amortization. Depreciation and amortization decreased by $0.7 million to $11.4 million in the three months ended June 30, 2021, from $12.1 million in the three months ended June 30, 2020, primarily due to a lower amount of depreciable assets.

Interest expense. Interest expense decreased by $0.8 million to $1.0 million in the three months ended June 30, 2021, from $1.8 million in the three months ended June 30, 2020, primarily due to lower average outstanding indebtedness and interest rates between periods.

Other income, net. Other income, net decreased by $2.1 million to $0.2 million in the three months ended June 30, 2021, from $2.3 million in the three months ended June 30, 2020, primarily due to a gain recorded for the disposal of certain assets in the prior year period.

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Income (loss) from equity method investments. Income (loss) from equity method investments changed by $0.6 million to income of $0.1 million in the three months ended June 30, 2021, from a loss of $(0.5) million in the three months ended June 30, 2020, primarily due to the operating results of SAFE&CEC S.r.l.

Income tax expense. Income tax expense was $0.1 million in each of the three months ended June 30, 2021 and 2020, primarily comprised of deferred taxes associated with goodwill and our expected state tax expense which was consistent between the periods.

Loss attributable to noncontrolling interest. During the three months ended June 30, 2021 and 2020, we recorded a gain of $0.3 million for the noncontrolling interest in the net loss of NG Advantage. The noncontrolling interest in NG Advantage represents a 6.7% minority interest that was held by third parties during both the 2021 and 2020 periods.

Six Months Ended June 30, 2021 Compared to Six Months Ended June 30, 2020

	Six Months Ended
	June 30,
	2020		2021
Statements of Operations Data:
Revenue:
Product revenue	86.5	%	75.7	%
Service revenue	13.5		24.3
Total revenue	100.0		100.0
Operating expenses:
Cost of sales (exclusive of depreciation and amortization shown separately below):
Product cost of sales	54.7		110.9
Service cost of sales	8.1		14.4
Change in fair value of derivative warrants	—		—
Selling, general and administrative	24.1		55.5
Depreciation and amortization	16.4		29.8
Total operating expenses	103.3		210.6
Operating loss	(3.3)		(110.6)
Interest expense	(2.8)		(3.1)
Interest income	0.4		0.6
Other income, net	1.7		1.1
Income (loss) from equity method investments	(0.2)		(0.4)
Loss before income taxes	(4.2)		(112.4)
Income tax expense	(0.1)		(0.2)
Net loss	(4.3)		(112.6)
Loss attributable to noncontrolling interest	0.8		0.7
Net loss attributable to Clean Energy Fuels Corp.	(3.5)	%	(111.9)	%

Revenue. Revenue decreased by $68.3 million to $77.6 million in the six months ended June 30, 2021, from $145.9 million in the six months ended June 30, 2020. This decrease was primarily due to the Amazon Warrant Charges of $78.1 million, an unfavorable change in fair value of our commodity swap and customer contracts entered into in connection with our Zero Now truck financing program, and a decrease in station construction sales and AFTC revenues, partially offset by an increase in volume-related revenue.

Volume-related revenue, excluding the effects of the change in fair value of our commodity swap and customer contracts entered in connection with our Zero Now truck financing program and the Amazon Warrant Charges, increased by $16.7 million between periods, attributable to an increase in gallons delivered and a higher effective price per gallon delivered. The effect on volume-related revenue as a result of the change in fair value of our commodity swap and customer contracts entered into in connection with our Zero Now truck financing program was $(6.7) million, as we recognized an

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unrealized gain of $4.2 million in 2020 compared to an unrealized loss of $2.5 million in 2021 (see Note 6 for more information).

Our effective price per gallon increased by $0.07 per gallon to $0.71 per gallon in the six months ended June 30, 2021, compared to $0.64 per gallon in the six months ended June 30, 2020, excluding the effects of the change in fair value of derivative instruments and Amazon Warrant Charges discussed above. Our effective price per gallon is defined as revenue generated from selling RNG and conventional natural gas and any related Environmental Credits and providing O&M services to our vehicle fleet customers at stations we do not own and for which we receive a per-gallon or fixed fee, all divided by the total GGEs delivered less GGEs delivered by non-consolidated entities, such as entities that are accounted for under the equity method. The increase in our effective price per gallon was due to higher RIN and natural gas prices, and a favorable fuel price mix, which is based on the variation of fuel types and locations where we deliver fuel.

Station construction sales decreased by $0.2 million between periods due to decreased construction activities.

AFTC revenue decreased by $0.1 million between periods due to the decrease in gallons sold in the first quarter of 2021 which negatively affected the six months ended June 30, 2021.

Cost of sales. Cost of sales increased by $5.8 million to $97.3 million in the six months ended June 30, 2021, from $91.5 million in the six months ended June 30, 2020. This increase was primarily due to an increase in gallons delivered and an increase in our effective cost per gallon delivered.

Our effective cost per gallon increased by $0.02 per gallon to $0.45 per gallon in the six months ended June 30, 2021 from $0.43 per gallon in the six months ended June 30, 2020. Our effective cost per gallon is defined as the total costs associated with delivering natural gas, including gas commodity costs, transportation fees, liquefaction charges, and other site operating costs, plus the total cost of providing O&M services at stations that we do not own and for which we receive a per-gallon or fixed fee, including direct technician labor, indirect supervisor and management labor, repair parts and other direct maintenance costs, all divided by the total GGEs delivered less GGEs delivered by non-consolidated entities, such as entities that are accounted for under the equity method. The increase in our effective cost per gallon was due to higher commodity prices.

Change in fair value of derivative warrants. Change in fair value of derivative warrants, all of which were issued by our subsidiary, NG Advantage, was $0.0 million in each of the six months ended June 30, 2021 and 2020. The warrants expired unexercised on July 2, 2020.

Selling, general and administrative. Selling, general and administrative expenses increased by $7.8 million to $43.0 million in the six months ended June 30, 2021, from $35.2 million in the six months ended June 30, 2020. This increase was primarily driven by an increase in stock-based compensation expense due to equity awards granted during the period and our higher stock price.

Depreciation and amortization. Depreciation and amortization decreased by $0.9 million to $23.1 million in the six months ended June 30, 2021, from $24.0 million in the six months ended June 30, 2020, primarily due to a lower amount of depreciable assets.

Interest expense. Interest expense decreased by $1.7 million to $2.4 million in the six months ended June 30, 2021, from $4.1 million in the six months ended June 30, 2020. This decrease was primarily due to lower average interest rates on outstanding indebtedness between periods.

Other income, net. Other income, net decreased $1.7 million to $0.8 million in the six months ended June 30, 2021, from $2.5 million in the six months ended June 30, 2020, primarily due to lower gains recorded from the disposal of certain assets.

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Income (loss) from equity method investments. Income (loss) from equity method investments changed $0.1 million, to a loss of $(0.3) million in the six months ended June 30, 2021, from a loss of $(0.4) million in the six months ended June 30, 2020, primarily due to the operating results of SAFE&CEC S.r.l.

Income tax expense. Income tax expense decreased to $0.1 million in the six months ended June 30, 2021 from $0.2 million in the six months ended June 30, 2020, primarily due to a decrease foreign taxes.

Loss attributable to noncontrolling interest. During the six months ended June 30, 2021 and 2020, we recorded a gain of $0.6 million and $1.1 million, respectively, for the noncontrolling interest in the net loss of NG Advantage. The noncontrolling interest in NG Advantage represents a 6.7% minority interest that was held by third parties during both the 2021 and 2020 periods.

Liquidity and Capital Resources

Liquidity

Liquidity is the ability to meet present and future financial obligations through operating cash flows, the sale or maturity of investments or the acquisition of additional funds through capital management. Our financial position and liquidity are, and will continue to be, influenced by a variety of factors, including the level of our outstanding indebtedness and the principal and interest we are obligated to pay on our indebtedness, which could be influenced by the potential discontinuance of LIBOR for certain of our debt instruments that tie interest rates to this metric; the amount and timing of any additional debt or equity financing we may pursue; our capital expenditure requirements; any merger, divestiture or acquisition activity; and our ability to generate cash flows from our operations. We expect cash provided by our operating activities to fluctuate as a result of a number of factors, including our operating results and the factors that affect these results, including the amount and timing of our vehicle fuel sales, station construction sales, sales of RINs and LCFS Credits and recognition of government credits, the effects of COVID-19, grants and incentives, if any; fluctuations in commodity, station construction and labor costs; Environmental Credit prices; variations in the fair value of certain of our derivative instruments that are recorded in revenue; and the amount and timing of our billing, collections and liability payments.

Cash Flows

Cash provided by operating activities was $12.9 million in the six months ended June 30, 2021, compared to cash provided by operating activities of $49.8 million in the comparable 2020 period. The decrease in cash provided by operating activities was primarily attributable to collection of AFTC receivables related to 2018 and 2019 volumes in the six months ended June 30, 2020.

Cash used in investing activities was $150.4 million in the six months ended June 30, 2021, compared to cash provided by investing activities of $43.6 million in the comparable 2020 period. The decrease in cash from investing activities was primarily attributable to net purchases of short-term investments in the six months ended June 30, 2021, compared to net maturities of short-term investments in the six months ended June 30, 2020, and investments in other entities in the six months ended June 30, 2021, including our contribution to the bpJV.

Cash provided by financing activities was $158.4 million in the six months ended June 30, 2021, compared to $63.2 million used in financing activities in the comparable 2020 period. The increase in cash provided by financing activities was primarily attributable to an increase in net proceeds from the issuance of common stock primarily in connection with our ATM Programs.

Capital Expenditures, Indebtedness and Other Uses of Cash

We require cash to fund our capital expenditures, operating expenses and working capital and other requirements, including costs associated with fuel sales; outlays for the design and construction of new fueling stations; additions or other modifications to existing fueling stations; RNG production facilities; debt repayments and repurchases; repurchases of common stock; purchases of heavy-duty trucks that use our fuels; additions or modifications of LNG production

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facilities; supporting our operations, including maintenance and improvements of our infrastructure; supporting our sales and marketing activities, including support of legislative and regulatory initiatives; financing vehicles for our customers; any investments in other entities; any mergers or acquisitions, including acquisitions to expand our RNG production capacity; pursuing market expansion as opportunities arise, including geographically and to new customer markets; and to fund other activities or pursuits and for other general corporate purposes.

Our business plan originally called for approximately $27.5 million in capital expenditures in 2021. These capital expenditures primarily relate to the construction of fueling stations, IT software and equipment and LNG plant costs, and we expect to fund these expenditures primarily through cash on hand and cash generated from operations. As a result of the Fuel Agreement with Amazon Logistics, Inc., we expect to deploy an additional $45.0 million to $60.0 million in capital expenditures to build fueling stations during the year ended December 31, 2021 that will support RNG fueling volume contracted to Amazon Logistics, Inc. We may fund up to $45.0 million of these expenditures through our SG Credit Agreement. Further, in 2021 we anticipate deploying up to approximately $100.0 million to develop ADG RNG production facilities. To that end, we contributed $50.2 million to the bpJV during the three months ended June 30, 2021.

In addition, NG Advantage may spend up to $0.4 million in 2021 to purchase additional equipment in support of its operations and customer contracts. Although NG Advantage has sought financing from third parties for capital expenditures, we have provided and may continue to provide financing for these capital expenditures.

We had total indebtedness, consisting of our debt and finance leases, of approximately $41.7 million in principal amount as of June 30, 2021, of which approximately $2.0 million, $14.2 million, $10.0 million, $5.5 million, $1.7 million, and $8.3 million is expected to become due in 2021, 2022, 2023, 2024, 2025 and thereafter, respectively. We expect our total interest payment obligations relating to this indebtedness to be approximately $2.3 million in 2021, $1.0 million of which had been paid when due as of June 30, 2021. We plan to and believe we are able to make all expected principal and interest payments in the next 12 months.

We also have indebtedness, including the amount representing interest, from our operating leases of approximately $50.3 million as of June 30, 2021, of which approximately $2.6 million, $5.5 million, $5.4 million, $5.4 million, $5.3 million and $26.1 million is expected to become due in 2021, 2022, 2023, 2024, 2025 and thereafter, respectively.

In addition, in connection with implementing our Zero Now truck financing program, we have entered into agreements that permit us to incur a material amount of additional debt on a delayed draw basis and obligate us to make interest and other fee payments that vary in amount depending on the outstanding principal of this debt and certain other factors; none of this potential debt nor the related interest and other payments are included in the foregoing estimates, other than the principal amount of $9.5 million drawn as of June 30, 2021.

We intend to make payments under our various debt instruments when due and pursue opportunities for earlier repayment and/or refinancing if and when these opportunities arise. Although we believe we have sufficient liquidity and capital resources to repay our debt coming due in the next 12 months, we may elect to suspend, or limit repurchases under, our share repurchase program or pursue alternatives, such as refinancing, or debt or equity offerings, to increase our cash management flexibility.

Sources of Cash

Historically, our principal sources of liquidity have consisted of cash on hand; cash provided by our operations, including, if available, AFTC and other government credits, grants and incentives; cash provided by financing activities; and sales of assets. As of June 30, 2021, we had total cash and cash equivalents and short-term investments of $254.2 million, compared to $138.5 million as of December 31, 2020.

We expect cash provided by our operating activities to fluctuate depending on our operating results, which can be affected by the factors described above, as well as the other factors described in this MD&A and Part II, Item 1A. “Risk Factors” of this report.

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In October 2018 and January 2019, we entered into agreements to implement our Zero Now truck financing program, which permit us to incur up to an additional $90.5 million of indebtedness through the beginning of January 2022, obligate us to make certain interest and other fee payments in connection with this debt and THUSA’s related guaranty (which payments will vary in amount but will be owed by us regardless of the revenue we may receive from the program), and subject us to potential additional payments in connection with related commodity swap arrangements. We are permitted to use any proceeds we receive under these agreements to fund the incremental cost of trucks purchased or financed by operators that participate in the Zero Now program. Additionally, in March 2021, the SG Credit Agreement was amended to permit us to use proceeds up to $45.0 million to fund certain station build costs and up to $20.0 million to fund Total JV Equity Obligations.

See Note 12 for more information about all of our outstanding debt.

Subject to the following paragraph, we believe our cash and cash equivalents and short-term investments and anticipated cash provided by our operating and financing activities will satisfy our expected business requirements for at least the 12 months following the date of this report. Subsequent to that period, we may need to raise additional capital to fund any planned or unanticipated capital expenditures, investments, debt repayments, share repurchases or other expenses that we cannot fund through cash on-hand, cash provided by our operations or other sources. Moreover, we may use our cash resources faster than we predict due to unexpected expenditures, the effects of COVID-19, or higher-than-expected expenses, in which case we may need to seek capital from alternative sources sooner than we anticipate. The timing and necessity of any future capital raise would depend on various factors, including our rate and volume of, and prices for, natural gas fuel sales and other volume-related activity, the effects of COVID-19, new station construction, debt repayments (either before or at maturity) and any potential mergers, acquisitions, investments, divestitures or other strategic relationships we may pursue, as well as the other factors that affect our revenue and expense levels as described in this MD&A and elsewhere in this report.

If we deploy additional capital to develop ADG RNG production facilities and fueling stations to support contracted RNG fueling volume we could be required to raise additional capital.

We may raise additional capital through one or more sources, including, among others, obtaining equity capital, including through offerings of our common stock or other securities, obtaining new or restructuring existing debt, selling assets, or any combination of these or other potential sources of capital. We may not be able to raise capital when needed, on terms that are favorable to us or our stockholders or at all. Any inability to raise necessary capital may impair our ability to develop and maintain fueling infrastructure, invest in strategic transactions or acquisitions or repay our outstanding indebtedness and may reduce our ability to support and build our business and generate sustained or increased revenue.

Off-Balance Sheet Arrangements

As of June 30, 2021, we had the following off-balance sheet arrangements that have had, or are reasonably likely to have, a material current or future effect on our financial condition, changes in financial condition, revenue or expenses, results of operations, liquidity, capital expenditures or capital resources:

● Outstanding surety bonds for construction contracts and general corporate purposes totaling $34.2 million;

● One long-term natural gas purchase contract with a take-or-pay commitment;

● Quarterly fixed price natural gas purchase contracts with take-or-pay commitments;

● One long-term natural gas sale contract with a fixed supply commitment along with a guaranty agreement; and

● One long-term natural gas sale contract with a fixed supply commitment.

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We provide surety bonds primarily for construction contracts in the ordinary course of our business, as a form of guarantee. No liability has been recorded in connection with our surety bonds because, based on historical experience and available information, we do not believe it is probable that any amounts will be required to be paid under these arrangements for which we will not be reimbursed.

As of June 30, 2021, we had one long-term natural gas purchase contract with a take-or-pay commitment, which requires us to purchase minimum volumes of natural gas at index-based prices and expires in June 2022. Additionally, as of June 30, 2021, we had quarterly fixed-price natural gas purchase contracts with take-or-pay commitments extending through June 2023.

NG Advantage has entered into an arrangement with bp for the supply, sale and reservation of a specified volume of CNG transportation capacity until March 2022. In connection with the arrangement, on February 28, 2018, we entered into a guaranty agreement with NG Advantage and bp, which was amended in June 2020, pursuant to which we guarantee NG Advantage’s payment obligations to the customer in the event of a default by NG Advantage under the supply arrangement, in an amount up to $15.0 million plus related fees. Our guaranty is in effect until thirty days following our notice to bp of termination.

In addition, as of June 30, 2021, we had a fixed supply arrangement with UPS for the supply and sale of 170.0 million GGEs of RNG through March 2026.

Item 3.—Quantitative and Qualitative Disclosures about Market Risk

In the ordinary course of our business, we are exposed to various market risks, including commodity price risks and risks related to foreign currency exchange rates.

Commodity Price Risk

We are subject to market risk with respect to our sales of natural gas, which have historically been subject to volatile market conditions. Our exposure to market risk is heightened when we have a fixed-price sales contract with a customer that is not covered by a futures contract, or when we are otherwise unable to pass through natural gas price increases to customers. Natural gas prices and availability are affected by many factors, including, among others, drilling activity, supply, weather conditions, the global trade environment, overall economic conditions and foreign and domestic government regulations.

Natural gas costs represented $74.6 million of our cost of sales in 2020 and $45.8 million of our cost of sales for the six months ended June 30, 2021.

In October 2018, in support of our Zero Now truck financing program, we entered into two commodity swap contracts with Total Gas & Power North America, an affiliate of Total and Total Holdings USA Inc., for a total of five million diesel gallons annually from April 1, 2019 to June 30, 2024. These commodity swap contracts are intended to manage risks related to the diesel-to-natural gas price spread in connection with the natural gas fuel supply commitments we make in our fueling agreements with fleet operators that participate in the Zero Now truck financing program.

We have prepared a sensitivity analysis to estimate our exposure to price risk with respect to our commodity swap contracts. If the diesel-to-natural gas price spread were to fluctuate by 10% as of June 30, 2021, we would expect a corresponding fluctuation in the fair value of our commodity swap contracts of approximately $3.0 million.

Foreign Currency Exchange Rate Risk

For the three months ended June 30, 2021, our primary exposure to foreign currency exchange rates related to our Canadian operations that had certain outstanding accounts receivable and accounts payable denominated in the U.S. dollar, which were not hedged.

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We have prepared a sensitivity analysis to estimate our exposure to market risk with respect to our monetary transactions denominated in a foreign currency. If the exchange rates on these assets and liabilities were to fluctuate by 10% from the rates as of June 30, 2021, we would expect a corresponding fluctuation in the value of the assets and liabilities of approximately $0.2 million, net.

Interest Rate Risk

As of June 30, 2021, we had $10.0 million of debt that bears interest at a rate equal to LIBOR or the Prime Rate plus a margin per annum. Thus, our interest expense would fluctuate with a change in LIBOR or the Prime Rate. If these rates were to each increase or decrease by 1% for the year, our annual interest expense would increase or decrease by approximately $0.1 million.

The SG Credit Agreement permits us to draw loans from time to time through the beginning of January 2022. These loans are subject to an interest rate indexed to LIBOR, certain tenors of which are expected to be discontinued after 2021 with other tenors being discontinued after June 2023. We intend to monitor the developments with respect to the discontinuance of LIBOR and work with our lenders under the credit agreements, including SG, and any other indebtedness with an interest rate tied to LIBOR to minimize the effect of such a discontinuance on our financial condition and results of operations; however, the effect of the anticipated discontinuance of LIBOR on us and our debt instruments remains uncertain. If our lenders have increased costs due to changes in LIBOR, we may experience potential increases in interest rates on our variable rate debt, which could adversely impact our interest expense, results of operations and cash flows.

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 the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Our management carried out an evaluation, with the participation of our Chief Executive Officer and Chief Financial Officer (our principal executive and principal financial officers, respectively), of the effectiveness of our disclosure controls and procedures as of June 30, 2021. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of June 30, 2021.

Changes in Internal Control over Financial Reporting

We regularly review and evaluate our internal control over financial reporting, and from time to time we may make changes to our processes and systems to improve controls or increase efficiencies. Such changes may include, among others, implementing new and more efficient systems, consolidating activities, and migrating processes.

There were no changes in our internal control over financial reporting that occurred during our most recently completed fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Inherent Limitations of Disclosure Controls and Procedures and Internal Control Over Financial Reporting

In designing our disclosure controls and procedures and internal control over financial reporting, management recognizes that any controls and procedures, no matter how well-designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of our controls and procedures must reflect the fact that there are resource constraints, and management necessarily applies its judgment in evaluating the benefits of possible controls and procedures relative to their costs. Because of these inherent limitations, our disclosure and internal controls may not prevent or detect all instances of fraud, misstatements or other control issues. In addition, projections of

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any evaluation of the effectiveness of disclosure or internal controls to future periods are subject to risks, including, among others, that controls may become inadequate because of changes in conditions or that compliance with policies or procedures may deteriorate.

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PART II.—OTHER INFORMATION

Item 1. —Legal Proceedings

From time to time, we may become involved in various legal proceedings that arise in the ordinary course of our business, including lawsuits, claims, audits, government enforcement actions and related matters. It is not possible to predict when or if these proceedings may arise, nor is it possible to predict the outcome of any proceedings that do arise, including, among other things, the amount or timing of any liabilities we may incur, and any such proceedings could have a material effect on us regardless of outcome. In the opinion of management, however, we are not a party, and our properties are not subject, to any pending legal proceedings that are material to us.

Item 1A.—Risk Factors

An investment in our Company involves a high degree of risk of loss. You should carefully consider the risk factors discussed below and all of the other information included in this report and our 2020 Form 10-K before you make any investment decision regarding our securities. We believe the risks and uncertainties described below are the most significant we face, but additional risks and uncertainties not known to us or that we currently deem immaterial could also be or become significant. The occurrence of any of these risks could harm our business, financial condition, results of operations, prospects and reputation and could cause the trading price of our common stock to decline.

Risks Related to Our Business

The COVID-19 pandemic and measures intended to reduce its spread has, and may continue to, adversely affect our business, results of operations and financial condition.

Beginning in late 2019, a novel strain of coronavirus (COVID-19) spread throughout the world, including the United States, ultimately being declared a pandemic. Global health concerns and increased efforts to reduce the spread of the COVID-19 pandemic prompted federal, state and local governments to restrict normal daily activities, which resulted in travel bans, quarantines, “shelter-in-place” orders requiring individuals to remain in their homes other than to conduct essential services or activities, business limitations and shutdowns (subject to exceptions for certain essential operations and businesses, including our business). Some of these governmental restrictions have since been scaled back or lifted, although an increase in the prevalence of COVID-19 cases and the spread of new and more contagious and/or vaccine resistant variants may result in the re-imposition of certain restrictions and may lead to other restrictions being implemented in response to efforts to reduce the spread of COVID-19. Given the dynamic nature of these circumstances and the related adverse impact these restrictions have had, and may continue to have, on the economy generally, our business and financial results may continue to be adversely affected by the COVID-19 pandemic.

Our operations have been designated “essential critical infrastructure work” in the energy sector by the U.S. Department of Homeland Security, meaning that we have been able to continue full operations. Despite our essential designation and our continued operations, however, we are subject to various risk and uncertainties because of the COVID-19 pandemic that could materially adversely affect our business, results of operations and financial condition, including the following:

● a further delay in the adoption of our RNG and natural gas vehicle fuels by heavy-duty trucks and/or a delay in increasing the use of our vehicle fuels;

● a continued or further decrease in the volume of truck and fleet operations, including shuttle busses at airports, and lower-than-normal levels of public transportation generally, which have resulted and may continue to result in decreased demand for our vehicle fuels; and

● the impact of business disruptions on the production of vehicles and engines that use our fuels, which has resulted in, and may continue to result in, plant closures, decreased manufacturing capacity, and delays in deliveries.

The duration and extent of the impact of the COVID-19 pandemic on our business and financial results will

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depend on future developments, including the duration, severity and spread of the pandemic, actions taken to contain its spread, any further resurgence of COVID-19, the severity and transmission rates of new variants of COVID-19, the availability, distribution, public acceptance and efficacy of vaccines and therapeutics for COVID-19, and how quickly and to what extent normal economic and operating conditions can resume within the markets in which we operate, each of which are highly uncertain at this time and outside of our control.  Even after the COVID-19 pandemic subsides, we may continue to experience adverse effects to our business and financial results because of its global economic impact, including any economic downturn or recession that has occurred or may occur. The adverse effect of the COVID-19 pandemic on our business, results of operations and financial condition could be material.

Our success is dependent on the willingness of fleets and other consumers to adopt our vehicle fuels, which may not occur in a timely manner, at expected levels or at all.

Our success is highly dependent on the adoption by fleets and other consumers of our RNG and conventional natural gas vehicle fuels. The market for our vehicle fuels has experienced slow, volatile and unpredictable growth in many sectors. For example, adoption and deployment of our vehicle fuels in heavy-duty trucking has been slower and more limited than we anticipated. Also, other important fleet markets, including airports and public transit, had slower volume and customer growth in 2018, 2019 and 2020 that may continue. If the market for our vehicle fuels does not develop at improved rates or levels, or if a market develops but we are not able to capture a significant share of the market or the market subsequently declines, our business, prospects, financial condition, and operating results would be harmed.

Factors that may influence the adoption of our vehicle fuels, many of which are beyond our control, include, among others:

● Lack of demand for trucks that use our vehicle fuels;

● Adoption of government policies or programs or increased publicity or popular sentiment in favor of vehicles or fuels other than RNG and natural gas, including long-standing support for gasoline and diesel-powered vehicles, changes to emissions requirements applicable to vehicles powered by gasoline, diesel, RNG, natural gas, or other vehicle fuels and/or growing support for electric and hydrogen-powered vehicles;

● Perceptions about the benefits of our vehicle fuels relative to gasoline, diesel and other alternative vehicle fuels, including with respect to factors such as supply, cost savings, environmental benefits and safety;

● Increases, decreases or volatility in the supply, demand, use and prices of crude oil, gasoline, diesel, RNG, natural gas and other vehicle fuels, such as electricity, hydrogen, renewable diesel, biodiesel and ethanol;

● Inertia among fleets and fleet vehicle operators, who may be unable or unwilling to prioritize converting a fleet to our vehicle fuels over an operator’s other general business concerns, particularly if the operator is not sufficiently incentivized by emissions regulations or other requirements or lacks demand for the conversion from its customers or drivers;

● Vehicle cost, fuel efficiency, availability, quality, safety, convenience (to fuel and service), design, performance and residual value, as well as operator perception with respect to these factors, generally and in our key customer markets and relative to comparable vehicles powered by other fuels;

● The development, production, cost, availability, performance, sales and marketing and reputation of engines that are well-suited for the vehicles used in our key customer markets, including heavy-duty trucks and other fleets;

● Increasing competition in the market for vehicle fuels generally, and the nature and effect of competitive developments in this market, including improvements in or perceived advantages of other vehicle fuels and engines powered by these fuels;

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● The availability and effect of environmental, tax or other government regulations, programs or incentives that promote our products or other alternatives as a vehicle fuel, including certain programs under which we generate credits by selling RNG as a vehicle fuel, as well as the market prices for such credits; and

● Emissions and other environmental regulations and pressures on producing, transporting, and dispensing our fuels.

In June 2020, the California Air Resources Board, or CARB, adopted the Advanced Clean Trucks regulation, which requires manufacturers to sell a gradually increasing proportion of zero-emission electric trucks, vans and pickup trucks from 2024 onwards. By the year 2045, the Advanced Clean Trucks regulation seeks to have every new commercial vehicle sold in California be zero-emissions. Further, in September 2020, the Governor of the State of California issued an executive order (the “September 2020 Executive Order”) providing that it shall be the goal of California that (i) 100% of in-state sales of new passenger cars and trucks will be zero-emission by 2035, (ii) 100% of medium- and heavy-duty vehicles in California will be zero-emission by 2045 for all operations, where feasible, and by 2035 for drayage trucks, and (iii) the state will transition to 100% zero-emission off-road vehicles and equipment by 2035 where feasible. The September 2020 Executive Order also directed CARB to develop and propose regulations and strategies aimed at achieving the foregoing goals. Among other things, we believe the intent of the Advanced Clean Trucks regulation and the September 2020 Executive Order is to limit and ultimately discontinue the production and use of internal combustion engines because such engines have “tailpipe” emissions. If either the Advanced Clean Trucks regulation or any additional regulations adopted by CARB, including pursuant to the September 2020 Executive Order, is permitted to take effect, it may slow, delay or prevent the adoption by fleets and other commercial consumers of our vehicle fuels, particularly in California. Moreover, because of the adoption of the Advanced Clean Trucks regulation and the issuance of the September 2020 Executive Order, other states have taken steps to enact similar regulations, which actions may accelerate if either regulation is permitted to take effect, thereby slowing, delaying or preventing the adoption of our vehicle fuels in those states as well.

Our RNG business may not be successful.

Our RNG business consists of procuring RNG from projects we plan to develop and own or from projects owned by third-party producers and reselling this RNG through our fueling infrastructure.

The success of our RNG business depends on our ability to secure, on acceptable terms, a sufficient supply of RNG; sell this RNG in adequate volumes and at prices that are attractive to customers and produce acceptable margins for us; and sell Environmental Credits we may generate under applicable federal or state programs from our sale of RNG as a vehicle fuel at favorable prices.

Our ability to maintain an adequate supply of RNG is subject to risks affecting RNG production. Projects that produce RNG often experience unpredictable production levels or other difficulties due to a variety of factors, including, among others, problems with equipment, severe weather, droughts, financial condition of the applicable ADG and LFG source owner, health crises, including the ongoing COVID-19 pandemic, construction delays, technical difficulties, high operating costs, limited availability, or unfavorable composition of collected feedstock gas, and plant shutdowns caused by upgrades, expansion or required maintenance. In addition, increasing demand for RNG will result in more robust competition for supplies of RNG, including from other vehicle fuel providers, gas utilities (which may have distinct advantages in accessing RNG supply including potential use of ratepayer funds to fund RNG purchases if approved by a utility’s regulatory commission) and other users and providers. If we or any of our RNG suppliers experience these or other difficulties in RNG production processes, or if competition for RNG development projects and supply increases, then our supply of RNG and our ability to resell it as a vehicle fuel could be jeopardized.

Our ability to generate revenue from our sale of RNG or our generation and sale of Environmental Credits depends on many factors, including the markets for RNG as a vehicle fuel and for Environmental Credits. The markets for Environmental Credits have been volatile and unpredictable in recent periods, and the prices for these credits are subject to fluctuations. For example, since January 1, 2020, market prices for RINs have been as high as $3.23 and as low as $0.80. Additionally, the value of Environmental Credits, and consequently the revenue levels we may receive from our sale of these credits, may be adversely affected by changes to the federal and state programs under which these credits are generated and sold, prices for and use of oil, diesel or gasoline, the inclusion of additional qualifying fuels in the programs,

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increased production and use of other fuels in the programs, or other conditions.  Our ability to generate revenue from sales of Environmental Credits depends on our strict compliance with these federal and state programs, which are complex and can involve a significant degree of judgment. If the agencies that administer and enforce these programs disagree with our judgments, otherwise determine we are not in compliance, conduct reviews of our activities or make changes to the programs, then our ability to generate or sell these credits could be restricted, permanently limited or lost entirely, and we could also be subject to fines or other sanctions. Any of these outcomes could force us to purchase credits in the open market to cover any credits we have contracted to sell, retire credits we may have generated but not yet sold, reduce or eliminate a significant revenue stream or incur substantial additional and unplanned expenses. We experienced many of these effects in connection with the administrative review by CARB of our generation of LCFS Credits in the third and fourth quarters of 2017, during which we were restricted from selling and transferring accumulated LCFS Credits, we were required to make cash payments to third parties to settle preexisting commitments to transfer LCFS Credits, and certain of our LCFS Credits were invalidated. Any permanent or temporary discontinuation or suspension of federal and state programs to provide credits, grants and incentives, such as an alternative fuel tax credit (“AFTC”), would also adversely impact our revenue.  Moreover, in the absence of programs that allow us to generate and sell Environmental Credits or other federal and state programs that support the RNG vehicle fuel market, or if our customers are not willing to pay a premium for RNG, we may be unable to operate our RNG business profitably or at all.

Our commercial success depends on our ability and the ability of our third-party supply sources to successfully develop and operate projects and produce expected volumes of RNG.

Our specific focus on RNG exposes us to risks related to the supply of and demand for RNG and Environmental Credits, the cost of capital expenditures, government regulation, and economic conditions, among other factors. As an RNG supplier we may also be negatively affected by lower RNG production resulting from lack of feedstock, mechanical breakdowns, faulty technology, competitive markets or changes to the laws and regulations that mandate the use of renewable energy sources.

In addition, other factors related to the development and operation of renewable energy projects could adversely affect our business, including: (i) changes in pipeline gas quality standards or other regulatory changes that may limit our ability to transport RNG on pipelines for delivery to vehicles or increase the costs of processing RNG to allow for such deliveries; (ii) construction risks, including the risk of delay, that may arise because of inclement weather, labor disruptions or increases in costs for equipment and construction materials; (iii) operating risks; (iv) weather conditions, including droughts, (v) financial condition of the applicable ADG and LFG source owner, (vi) health of the applicable dairy herd; (vii) consolidation in the dairy industry; (viii) budget overruns; (ix) possible liabilities because of unforeseen environmental, construction, technological or other complications; (x) failures or delays in obtaining desired or necessary rights, including leases and feedstock agreements; and (xi) failures or delays in obtaining and keeping in good standing permits, authorizations and consents from local city, county, state and U.S. federal governments as well as local and U.S. federal governmental organizations.  Any of these factors could prevent completion or operation of projects, or otherwise adversely affect our business, financial condition, and results of operations.

Acquisition, financing, construction, and development of projects by us or our partners that own projects may not commence on anticipated timelines or at all.

Our strategy is to continue to expand, including through the acquisition of additional projects and by signing additional supply agreements with third party project owners. From time to time we and our partners enter into nonbinding letters of intent for projects.  Until the negotiations are final, however, and the parties have executed definitive documentation, we or our partners may not be able to consummate any development or acquisition transactions, or any other similar arrangements, on the terms set forth in the applicable letter of intent or at all.

The acquisition, financing, construction and development of projects involves numerous risks, including:

● the ability to obtain financing for a project on acceptable terms or at all;

● difficulties in identifying, obtaining, and permitting suitable sites for new projects;

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● failure to obtain all necessary rights to land access and use;

● inaccuracy of assumptions with respect to the cost and schedule for completing construction;

● inaccuracy of assumptions with respect to the biogas potential, including quality, volume, and asset life;

● delays in deliveries or increases in the price of equipment;

● permitting and other regulatory issues, license revocation and changes in legal requirements;

● increases in the cost of labor, labor disputes and work stoppages;

● failure to receive quality and timely performance of third-party services;

● unforeseen engineering and environmental problems;

● cost overruns;

● accidents involving personal injury or the loss of life; and

● weather conditions, catastrophic events, including fires, explosions, earthquakes, droughts and acts of terrorism, and other force majeure events.

We are dependent on the production of vehicles and engines in our key customer and geographic markets by vehicle and engine manufacturers, over which we have no control.

Vehicle and engine manufacturers control the development, production, quality assurance, cost and sales and marketing of their products, which shapes the performance, availability and reputation of these products in the marketplace. We are dependent on these manufacturers to succeed in our target markets, and we have no influence or control over their activities. For example, Cummins Westport is the only engine manufacturer for the RNG and natural gas heavy-duty truck market in the United States, and Cummins Westport and other original equipment manufacturers currently produce a relatively small number of engines and vehicles that use our vehicle fuels. These manufacturers may decide not to expand or maintain, or may decide to discontinue or curtail, their engine or vehicle product lines for a variety of reasons, including as a result of the adoption of government policies or programs such as the Advanced Clean Trucks regulation and the September 2020 Executive Order.  Further, the supply of engines or vehicle product lines by these manufacturers has been disrupted/delayed due to the COVID-19 pandemic. The limited production of engines and vehicles that use our fuels increases their cost and limits availability, which restricts large-scale adoption, and may reduce resale value, which may contribute to operator reluctance to convert their vehicles to our fuels. In addition, some operators have communicated to us that the first-generation models of heavy-duty truck engines using our fuels have a reputation for unsatisfactory performance, and that this reputation or their first-hand experiences of such performance may be a factor in operator decisions regarding whether to convert their fleets to vehicles that use our fuels.

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To secure ADG RNG from new projects we develop, we typically face a long and variable development cycle that requires significant resource commitments and a long lead time before we realize revenue.

The development, design and construction process for ADG RNG projects generally lasts between 12 to 18 months on average. Prior to entering into a letter of intent with respect to an ADG RNG project we typically conduct a preliminary assessment of whether the site is commercially viable based on our expected return on investment, investment payback period, and other operating metrics, as well as the necessary permits to develop a project on that site. After entering a project letter of intent, we perform a more detailed review of the site’s facilities, which serves as the basis for the final specifications of the project. Finally, we negotiate and execute contracts with the site owner. This extended development process requires the dedication of significant time and resources from our personnel, with no certainty of success or recovery of our expenses. Further, upon commencement of operations, it takes about 12 months for the project to ramp up to expected production level, receive necessary registrations and approvals from the Environmental Protection Agency (the “EPA”) and CARB, and begin generating revenue. All these factors, and in particular, expenditures on development of projects that will not generate significant revenue in the near term, can contribute to fluctuations in our quarterly financial performance and increase the likelihood that our operating results in a particular period will fall below investor expectations.

Livestock waste and dairy farm projects have different economic models and risk profiles than landfill facilities, and we may not be able to achieve the operating results we expect from these projects.

Livestock waste and dairy farm projects produce significantly less RNG and have higher operating costs than landfill facilities. As a result, these projects are even more dependent on the LCFS credits and, to a lesser extent, RINs for commercial viability. If CARB reduces the CI score that it applies to waste conversion projects, such as dairy digesters, the number of LCFS credits for RNG generated at livestock waste and dairy farm projects will decline. Additionally, revenue from LCFS credits also depends on the price per LCFS credit, which is driven by various market forces, including the supply of and demand for LCFS credits, which in turn depends on the demand for traditional transportation fuel and the supply of renewable fuel from other renewable energy sources, and mandated CI targets, which determine the number of LCFS credits required to offset LCFS deficits. Fluctuations in the price of LCFS credits or the number of LCFS credits assigned will have a significantly greater effect on the success of livestock waste and dairy farm projects. A significant decline in the value of LCFS credits adversely affect our business, financial condition, and results of operations.

We have a history of losses and may incur additional losses in the future.

We incurred pre-tax losses in 2018, 2020 and the six months ended June 30, 2021. During 2018, 2019, 2020 and the six months ended June 30, 2021, our results were positively affected by $26.7 million, $47.1 million, $19.8 million, and $9.7 million of AFTC revenue, respectively.  We may incur losses in future periods, and we may never sustain profitability, either of which would adversely affect our business, prospects and financial condition and may cause the price of our common stock to fall. Furthermore, historical losses may not be indicative of future losses due to the unpredictability of the COVID-19 pandemic, and our future losses may be greater than our past losses. In addition, to try to achieve or sustain profitability, we may choose or be forced to take actions that result in material costs or material asset or goodwill impairments. For instance, in the third and fourth quarters of 2017, we recorded significant charges in connection with our former fueling compressor manufacturing business (which we combined with another company’s fueling compressor manufacturing business in the CEC Combination (as defined in Note 3)), our closure of certain fueling stations, our determination that certain assets were impaired because of the foregoing, and other actions. We review our assets for impairment whenever events or changes in circumstances indicate that the carrying value of an asset or asset group may not be recoverable, and we perform a goodwill impairment test on an annual basis and between annual tests in certain circumstances, in each case in accordance with applicable accounting guidance and as described in the financial statements and related notes included in this report. Changes to the use of our assets, divestitures, changes to the structure of our business, significant negative industry or economic trends, disruptions to our operations, inability to effectively integrate any acquired businesses, further market capitalization declines, or other similar actions or conditions could result in additional asset impairment or goodwill impairment charges or other adverse consequences, any of which could have material negative effects on our financial condition, our results of operations and the trading price of our common stock.

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Our plans for hydrogen and electric vehicle stations will require significant cash investments and management resources and may not meet our expectations.

As operators deploy hydrogen powered vehicles, we plan to modify our fueling stations to reform our RNG and deliver clean hydrogen.  Further, we have the capability to add electric charging at our sites, and we believe our RNG can be used to generate clean electricity to power vehicles.  

Our plans will require significant cash investments and management resources and may not meet our expectations with respect to additional sales of our vehicle fuels. We have experience constructing hydrogen fueling stations, but such facilities cost significantly more than traditional RNG vehicle fueling stations.  In addition, we have not yet added electric charging capability to any of our stations, and the cost of such capability may be significant.  We will need to ensure compliance with all applicable regulatory requirements, including obtaining any required permits and land use rights, which could take considerable time and expense and is subject to the risk that government support in certain areas may be discontinued. If we are unable to modify our stations to provide hydrogen or add electric charging to our stations, or experience delays, our stations may be unable to meet our customer demand, which may negatively impact our business, prospects, financial condition, and operating results.

Cummins, Daimler, Dana, Navistar, PACCAR, Toyota, Volvo, XOS, Tesla and Nikola have announced their plans to bring long-haul Class 8 commercial hydrogen- and battery- powered vehicles to the market.  We will be, however, dependent on these manufacturers to succeed in our target markets, and we will have no influence over their activities.  See the risks discussed under “We are dependent on the production of vehicles and engines in our key customer and geographic markets by vehicle and engine manufacturers, over which we have no control,” above and elsewhere in these risk factors.  

Increases, decreases and general volatility in oil, gasoline, diesel, natural gas and RNG prices could adversely affect our business.

The prices of RNG, natural gas, crude oil, gasoline and diesel can be volatile and this volatility may continue to increase. Factors that may cause volatility in the prices of RNG, natural gas, crude oil, gasoline and diesel include, among others, changes in supply and availability of crude oil, RNG and natural gas, government regulations, inventory levels, consumer demand, price and availability of alternatives, weather conditions, negative publicity about crude oil or natural gas drilling, production or transportation techniques and methods, economic, health and political conditions, transportation costs and the price of foreign imports. If the prices of crude oil, gasoline and diesel are low or decline, or if the price of RNG or natural gas increases without corresponding increases in the prices of crude oil, gasoline and diesel or Environmental Credits, then we may not be able to offer our customers an attractive price for our vehicle fuels, market adoption of our vehicle fuels could be slowed or limited and/or we may be forced to reduce the prices at which we sell our vehicle fuels in order to try and attract new customers or prevent the loss of demand from existing customers. Natural gas and crude oil prices are expected to remain volatile for the near future because of market uncertainties over supply and demand, including due to the state of the world economies, energy infrastructure and other factors. Fluctuations in natural gas prices affect the cost to us of the natural gas commodity. High natural gas prices adversely affect our operating margins when we cannot pass the increased costs through to our customers. Conversely, lower natural gas prices reduce our revenue when the commodity cost is passed through to our customers.

Pricing conditions may also exacerbate the cost differential between vehicles that use our fuels and gasoline or diesel-powered vehicles, which may lead operators to delay or refrain from purchasing or converting to our vehicle fuels. Generally, vehicles that use our fuels cost more initially than gasoline or diesel-powered vehicles because the components needed for a vehicle to use our fuels add to the vehicle’s base cost. Operators then seek to recover the additional base cost over time through a lower cost to use our fuels. Operators may, however, perceive an inability to timely recover these additional initial costs if our vehicle fuels are not available at prices sufficiently lower than gasoline and diesel. Such an outcome could decrease our potential customer base and harm our business prospects.

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We face increasing competition from competitors, many of which have far greater resources, experience, customer bases and brand awareness than we have, and we may not be able to compete effectively with these businesses.

The market for vehicle fuels is highly competitive. The biggest competition for our products is gasoline and diesel because most vehicles in our key markets are powered by these fuels. We also compete with suppliers of other alternative vehicle fuels, including renewable diesel, biodiesel, and ethanol, as well as producers and fuelers of alternative vehicles, including hybrid, electric and hydrogen-powered vehicles.  Additionally, our stations compete directly with other natural gas fueling stations and indirectly with electric vehicle charging stations and fueling stations for other vehicle fuels.

Many businesses are in the market for RNG and other alternatives for use as vehicle fuel, including alternative vehicle and alternative fuel companies, refuse collectors, industrial gas companies, private equity groups, commodity traders, truck stop and fuel station owners, fuel providers, gas marketers, utilities and their affiliates and other organizations. If the alternative vehicle fuel market grows, then the number and type of participants in this market and their level of capital and other commitments to alternative vehicle fuel programs could increase. Many of our competitors have substantially greater experience, customer bases, brand awareness and financial, marketing and other resources than we have. As a result, these competitors may be able to respond more quickly to changes in customer preferences, legal requirements or other industry or regulatory trends; devote greater resources to the development, promotion and sale of their products; adopt more aggressive pricing policies; dedicate more effort to infrastructure and systems development in support of their business or product development activities; implement more robust or creative initiatives to advance consumer acceptance of their products; or exert more influence on the regulatory landscape that affects the vehicle fuels market.

We expect competition to increase in the vehicle fuels market generally. In addition, if the demand for alternative vehicle fuels, including RNG, increases, then we expect competition to also increase. Any such increased competition may reduce our customer base and revenue and may lead to increased pricing pressure, reduced operating margins and fewer expansion opportunities.

NG Advantage may not be successful.

NG Advantage provides “virtual pipelines” to transport CNG by truck from compression facilities to pipeline interconnects and to industrial and commercial customers that do not have direct access to natural gas pipelines. NG Advantage faces unique risks, including among others: (i) it has a history of net losses and has incurred substantial indebtedness; (ii) NG Advantage will need to raise additional capital, which may not be available, may only be available on onerous terms, or may only be available from the Company; (iii) the labor market for truck drivers is very competitive, which increases NG Advantage’s difficulty in meeting its delivery obligations; (iv) NG Advantage often transports CNG in trailers over long distances and these trailers may be involved in accidents; and (v) NG Advantage’s CNG trailers may become subject to new or changed regulations that could adversely affect its business. If NG Advantage fails to manage any of these risks, our business, financial condition, liquidity, results of operations, prospects and reputation may be harmed.  In addition, we have been a significant source of financing for NG Advantage, consisting of loans of $12.9 million and $26.7 million in the years ended December 31, 2020 and 2019, respectively, and a $5.0 million equity investment in the year ended December 31, 2018. If NG Advantage is not able to obtain financing from external sources, we will need to provide additional debt or equity capital to allow NG Advantage to satisfy its commitments and maintain operations.

Our station construction activities subject us to business and operational risks.

As part of our business activities, we design and construct vehicle fueling stations that we either own and operate ourselves or sell to our customers. These activities require a significant amount of judgment in determining where to build and open fueling stations, including predictions about fuel demand that may not be accurate for any of the locations we target. As a result, we have built stations that we may not open for fueling operations, and we may open stations that fail to generate the volume or profitability levels we anticipate, either or both of which could occur due to a lack of sufficient customer demand at the station locations or for other reasons. For any stations that are completed but unopened, we would have substantial investments in assets that do not produce revenue, and for any stations that are open and underperforming, we may decide to close the stations. We determined to close a number of underperforming stations in the third and fourth quarters of 2017 and recorded impairment charges in connection with these closures and other related actions.  As of June

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30, 2021, we had 31 completed stations that were not open for fueling operations (we refer to these as “RTO”). We expect to open these stations when we have sufficient customers to fuel at the locations, but we do not know when or if this will occur. Elimination of any RTOs and/or any station closures could result in substantial additional costs and non-cash asset impairments or other charges and could cause the price of our common stock to decline.

We also face many operational challenges in connection with our station design and construction activities. For example, we may not be able to identify suitable locations for the stations we or our customers seek to build. Additionally, even if preferred sites can be located, we may encounter land use or zoning difficulties, problems with utility services, challenges obtaining and retaining required permits and approvals or local resistance, including due to reduced operations of permitting agencies because of the ongoing COVID-19 pandemic, any of which could prevent us or our customers from building new stations on these sites or limit or restrict the use of new or existing stations. Any such difficulties, resistance or limitations or any failure to comply with local permit, land use or zoning requirements could restrict our activities or expose us to fines, reputational damage or other liabilities, which would harm our business and results of operations. In addition, we act as the general contractor and construction manager for new station construction and facility modification projects, and we typically rely on licensed subcontractors to perform the construction work. We may be liable for any damage we or our subcontractors cause or for injuries suffered by our employees or our subcontractors’ employees during the course of work on our projects. Additionally, shortages of skilled subcontractor labor could significantly delay a project or otherwise increase our costs. Further, our expected profit from a project is based in part on assumptions about the cost of the project, and cost overruns, delays or other execution issues may, in the case of projects we complete and sell to customers, result in our failure to achieve our expected margins or cover our costs, and in the case of projects we build and own, result in our failure to achieve an acceptable rate of return. If any of these events occur, our business, operating results and liquidity could be negatively affected.

We have significant contracts with government entities, which are subject to unique risks.

We have, and expect to continue to seek, long-term fueling station construction, maintenance and fuel sale contracts with various government bodies, which accounted for 22%, 21% and 22% of our revenue in 2018, 2019 and 2020, respectively. In addition to normal business risks, including the other risks discussed in these risk factors, our contracts with government entities are often subject to unique risks, some of which are beyond our control. For example, long-term government contracts and related orders are subject to cancellation if adequate appropriations for subsequent performance periods are not made. Further, the termination of funding for a government program supporting any of our government contracts could result in the loss of anticipated future revenue attributable to the contract. Moreover, government entities with which we contract are often able to modify, curtail or terminate contracts with us at their convenience and without prior notice, and would only be required to pay for work completed and commitments made at or prior to the time of termination.

In addition, government contracts are frequently awarded only after competitive bidding processes, which are often protracted. In many cases, unsuccessful bidders for government contracts are provided the opportunity to formally protest the contract awards through various agencies or other administrative and judicial channels. The protest process may substantially delay a successful bidder’s contract performance, result in cancellation of the contract award entirely and distract management. As a result, we may not be awarded contracts for which we bid, and substantial delays or cancellation of contracts may follow any successful bids as a result of any protests by other bidders. The occurrence of any of these risks would have a material adverse effect on our results of operations and financial condition.

We may from time to time pursue acquisitions, divestitures, investments or other strategic relationships or transactions, which could fail to meet expectations or otherwise harm our business.

We may acquire or invest in other companies or businesses or pursue other strategic transactions or relationships, such as joint ventures, collaborations, divestitures, or other similar arrangements. For example, in 2021 we have created joint ventures with each of Total and bp to develop and own dairy RNG production projects.  These strategic transactions and relationships and any others we may pursue in the future involve numerous risks, any of which could harm our business, performance and liquidity, including, among others, the following: (i) difficulties integrating the operations, personnel, contracts, service providers and technologies of an acquired company or partner; (ii) diversion of financial and management resources from existing operations or alternative acquisition, investment, strategic or other opportunities; (iii)

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failure to realize the anticipated synergies or other benefits of a transaction or relationship; (iv) risks of entering new customer or geographic markets in which we may have limited or no experience; (v) potential loss of an acquired company’s or partner’s key employees, customers or vendors in the event of an acquisition or investment, or potential loss of our assets (and their associated revenue streams), employees or customers in the event of a divestiture or other strategic transaction; and (vi) incurrence of substantial costs or debt or equity dilution to fund an acquisition, investment or other transaction or relationship, as well as possible write-offs or impairment charges relating to any businesses we partner with, invest in or acquire.

Our partners may choose to invest in renewable or low carbon vehicle fuels other than RNG.

Our partners, including Total, bp and Chevron, may reallocate their resources from RNG to other renewable or low carbon vehicle fuels. Any such action would have a material adverse effect on our plans, results of operations and financial condition.

Our results of operations fluctuate significantly and are difficult to predict.

Our results of operations have historically experienced, and may continue to experience, significant fluctuations as a result of a variety of factors, including, among others, the amount and timing of our vehicle fuel sales, Environmental Credit sales and recognition of government credits, station construction sales, grants and incentives, such as AFTC (for example, we recorded all of the AFTC revenue associated with our vehicle fuel sales made in 2017 during the first quarter of 2018, and we recorded all of the AFTC revenue associated with our vehicles fuel sales made in 2018 and 2019 in the fourth quarter of 2019); fluctuations in commodity, station construction and labor costs; variations in the fair value of certain of our derivative instruments that are recorded in revenue; sales of compressors and other equipment used in RNG production and at fueling stations; the amount and timing of our billing, collections and liability payments; and the other factors described in these risk factors.

Our performance in certain periods has also been affected by transactions or events that have resulted in significant cash or non-cash gains or losses. For example, our results for 2017 were positively affected by gains related to repurchases or retirements of our outstanding convertible debt at a discount and by a gain related to bp, but were also negatively affected by significant charges in connection with our closure of certain fueling stations, the decreased operating performance of our former fueling compressor manufacturing business, our determination of an impairment of assets as a result of the foregoing, and certain other actions. These or other similar gains or losses may not recur regularly, in the same amounts or at all in future periods.

These significant fluctuations in our operating results may render period-to-period comparisons less meaningful, especially given the current uncertainties related to the ongoing COVID-19 pandemic, and investors in our securities should not rely on the results of one period as an indicator of performance in any other period. Additionally, these fluctuations in our operating results could cause our performance in any period to fall below the financial guidance we may have provided to the public or the estimates and projections of the investment community, which could negatively affect the price of our common stock.

Our warranty reserves may not adequately cover our warranty obligations, which could result in unexpected costs.

We provide product warranties with varying terms and durations for the stations we build and sell, and we establish reserves for the estimated liability associated with these warranties. Our warranty reserves are based on historical trends and any specifically identified warranty issues known to us, and the amounts estimated for these reserves could differ materially from the warranty costs we may actually incur. We would be adversely affected by an increase in the rate or volume of warranty claims or the amounts involved in warranty claims, any of which could increase our costs beyond our established reserves and cause our cash position and financial condition to suffer.

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Risks Related to Our Indebtedness and Other Capital Resources.

We may need to raise additional capital to continue to fund our business, which could have negative effects and may not be available when needed, on acceptable terms or at all.

We require capital to pay for capital expenditures, operating expenses, any mergers, acquisitions or strategic investments, transactions or relationships we may pursue, and to make principal and interest payments on our indebtedness. If we cannot fund any of these activities with capital on-hand or cash provided by our operations, we may seek to obtain additional capital from other sources, such as by selling assets or pursuing debt or equity financing.

Asset sales and equity or debt financing may not be available when needed, on terms favorable to us or at all. Any sale of our assets to generate cash proceeds may limit our operational capacity and could limit or eliminate any revenue streams or business plans that are dependent on the sold assets. Any issuances of our common stock or securities convertible into our common stock to raise capital would dilute the ownership interest of our existing stockholders. Any debt financing we may pursue could require us to make significant interest or other payments and to pledge some or all of our assets as security. In addition, higher levels of indebtedness could increase our risk of non-repayment, adversely affect our creditworthiness, and amplify the other risks associated with our existing debt, which are discussed elsewhere in these risk factors. Further, we may incur substantial costs in pursuing any capital-raising transactions, including investment banking, legal and accounting fees. On the other hand, if we are unable to obtain capital in amounts sufficient to fund our obligations, expenses, and strategic initiatives, we could be forced to suspend, delay or curtail our business plans or operating activities or could default on our contractual commitments. Any such outcome could negatively affect our business, performance, liquidity, and prospects.

We may not generate sufficient cash flow from our business to pay our debt.

As of June 30, 2021, we have consolidated indebtedness of $41.7 million, and we are permitted to incur significant additional debt. Our outstanding and permitted indebtedness could make us more vulnerable to adverse changes in general U.S. and worldwide economic, regulatory, and competitive conditions, limit our flexibility to plan for or react to changes in our business or industry, place us at a disadvantage compared to our competitors that have less debt or limit our ability to borrow or otherwise raise additional capital as needed.

Our payments of amounts owed under our various debt instruments will reduce our cash resources available for other purposes, including pursuing strategic initiatives, transactions or other opportunities, satisfying our other commitments and generally supporting our operations. Moreover, our ability to make these payments depends on our future performance, which is subject to economic, financial, competitive and other factors, including those described in these risk factors, and many of which are beyond our control. Our business may not generate sufficient cash from operations to service our debt.

If we cannot meet our debt obligations from our operating cash flows, we may pursue one or more alternative measures. Any repayment of our debt with equity, however, would dilute the ownership interests of our existing stockholders. Additionally, because the agreements governing much of our existing indebtedness contain minimal restrictions on our ability to incur additional debt and do not require us to maintain financial ratios or specified levels of net worth or liquidity, we may seek capital from other sources to service our debt, such as selling assets, restructuring or refinancing our existing debt or obtaining additional equity or debt financing. Our ability to engage in any of these activities, if we decide to do so, would depend on the capital markets and the state of our industry, business and financial condition at the time, and could also subject us to significant risks, which are discussed elsewhere in these risk factors. Moreover, we may not be able to obtain any additional capital we may pursue on desirable terms, at a desirable time or at all. Any failure to pay our debts when due could result in a default on our debt obligations. In addition, certain of our debt agreements contain restrictive covenants, and any failure by us to comply with these covenants could also cause us to be in default under these agreements.

In the event of any default on our debt obligations, the holders of the indebtedness could, among other things, declare all amounts owed immediately due and payable. Any such declaration could deplete all or a large portion of our

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available cash flow, and thereby reduce the amount of cash available to pursue our business plans or force us into bankruptcy or liquidation.

Risks Related to Environmental Health and Safety and Governmental and Environmental Regulations

Our business is influenced by environmental, tax and other government regulations, programs and incentives that promote our vehicle fuels, and their adoption, modification or repeal could negatively affect our business.

Our business is influenced by federal, state, and local tax credits, rebates, grants and other government programs and incentives that promote the use of our vehicle fuels. These include various government programs that make grant funds available from purchase of vehicles and construction of fueling stations, as well as the AFTC under which we generate revenue for our vehicle fuel sales. The AFTC expires at the end of 2021. If the AFTC is not extended after 2021 the AFTC would not be available for vehicle fuel sales, and our revenue would be materially adversely affected. Additionally, our business is influenced by laws, rules and regulations that require reductions in carbon emissions and/or the use of renewable fuels, such as the programs under which we generate Environmental Credits.

These programs and regulations, which have the effect of encouraging the use of RNG as a vehicle fuel, could expire or be repealed or amended for a variety of reasons. For example, parties with an interest in gasoline and diesel, electric or other alternative vehicles or vehicle fuels, including lawmakers, regulators, policymakers, environmental or advocacy organizations, producers of alternative vehicles or vehicle fuels, or other powerful groups, may invest significant time and money in efforts to delay, repeal or otherwise negatively influence regulations and programs that promote RNG. Many of these parties have substantially greater resources and influence than we have. Further, changes in federal, state or local political, social or economic conditions, including a lack of legislative focus on these programs and regulations, could result in their modification, delayed adoption or repeal. Any failure to adopt, delay in implementing, expiration, repeal or modification of these programs and regulations, or the adoption of any programs or regulations that encourage the use of other alternative fuels or alternative vehicles over RNG, would reduce the market for RNG as a vehicle fuel and harm our operating results, liquidity, and financial condition.

For instance, California lawmakers and regulators have implemented various measures designed to increase the use of electric, hydrogen and other zero-emission vehicles, including establishing firm goals for the number of these vehicles operating on state roads by specified dates and enacting various laws and other programs in support of these goals. Although the influence and applicability of these or similar measures on our business remains uncertain, a focus on “zero tailpipe emission” vehicles over vehicles with an overall net carbon negative emissions profile, but with some tailpipe emissions operating on RNG, would adversely affect the market for our fuels.  

To benefit from Environmental Credits, RNG projects are required to be registered and are subject to audit.

RNG projects are required to register with the EPA and relevant state regulatory agencies. Further, we qualify our RINs through a voluntary Quality Assurance Plan, which typically takes from three to five months from first injection of RNG into the commercial pipeline system. Delays in obtaining registration, RIN qualification, and any LCFS credit qualification of a new project could delay future revenues from a project and could adversely affect our cash flow. Further, we may make large investments in projects prior to receiving the regulatory approval and RIN qualification. By registering RNG projects with the EPA’s voluntary Quality Assurance Plan, we are subject to quarterly third-party audits and semi-annual on-site visits of projects to validate generated RINs and overall compliance with the federal renewable fuel standard. We are also subject to a separate third party’s annual attestation review. The Quality Assurance Plan provides a process for RIN owners to follow, for an affirmative defense to civil liability, if used or transferred Quality Assurance Plan verified RINs were invalidly generated. A project’s failure to comply could result in remedial action by the EPA, including penalties, fines, retirement of RINs, or termination of the project’s registration, any of which could adversely affect our business, financial condition and results of operations.

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Our business could be negatively affected by federal or state laws or regulations mandating new or additional limits on GHG emissions, “tailpipe” emissions or internal combustion engines.

Federal or state laws or regulations have been adopted, such as California’s AB 32 cap and trade law, and may be adopted that impose limits on GHG emissions. The effects of GHG emission limits on our business are subject to significant uncertainties based on, among other things, the timing of any requirements, the required levels of emission reductions, the nature of any market-based or tax-based mechanisms adopted to facilitate reductions, the relative availability of GHG emission reduction offsets, the development of cost-effective, commercial-scale carbon capture and storage technology and supporting regulations and liability mitigation measures, the range of available compliance alternatives, and our ability to demonstrate that our vehicle fuels qualify as a compliance alternative under any statutory, regulatory, or standards-based organization (such as GRI) programs to limit GHG emissions. If our vehicle fuels are not able to meet GHG emission limits or perform as well as other alternative fuels and vehicles, our solutions could be less competitive. Furthermore, additional federal or state taxes could be implemented on “tailpipe” emissions, which would have a negative impact on the cost of our vehicle fuels, as compared to vehicle fuels that do not generate tailpipe emissions. See also the discussion above regarding the Advanced Clean Trucks regulation and the September 2020 Executive Order under “Our success is dependent on the willingness of fleets and other consumers to adopt our vehicle fuels, which may not occur in a timely manner, at expected levels or at all.”

Our business is subject to a variety of government regulations, which may restrict our operations and result in costs and penalties or otherwise adversely affect our business and ability to compete.

We are subject to a variety of federal, state and local laws and regulations relating to the environment, health and safety, labor and employment, building codes and construction, zoning and land use, the government procurement process, any political activities or lobbying in which we may engage, public reporting and taxation, among others. It is difficult and costly to manage the requirements of every authority having jurisdiction over our various activities and to comply with their varying standards. Many of these laws and regulations are complex, change frequently, may be unclear and difficult to interpret and have become more stringent over time. Any changes to existing regulations or adoption of new regulations may result in significant additional expense to us or our customers. For example, in June 2020, California passed the Advanced Clean Trucks regulation, which seeks to have all new commercial vehicles sold in California have zero-emissions by 2045, and in September 2020, California’s Governor issued the September 2020 Executive Order, which seeks to have 100% of medium- and heavy-duty vehicles in California be zero emission by 2045. Further, from time to time, as part of the regular evaluation of our operations, including newly acquired or developing operations, we may be subject to compliance audits by regulatory authorities, which may distract management from our revenue-generating activities and involve significant costs and use of other resources. Also, we often need to obtain facility permits or licenses to address, among other things, storm water or wastewater discharges, waste handling and air emissions in connection with our operations, which may subject us to onerous or costly permitting conditions or delays if permits cannot be timely obtained.  Our failure to comply with any applicable laws and regulations could result in a variety of administrative, civil and criminal enforcement measures, including, among others, assessment of monetary penalties, imposition of corrective requirements or prohibition from providing services to government entities. If any of these enforcement measures were imposed on us, our business, financial condition, and performance could be negatively affected.

We are subject to various environmental laws and regulations that could impose substantial costs upon us.

Our operations are and will be subject to federal, state and local environmental laws and regulations, including laws relating to the use, handling, storage, disposal of and human exposure to hazardous materials. Moreover, we expect that we will be affected by future amendments to such laws or other new environmental and health and safety laws and regulations which may require us to change our operations, potentially resulting in a material adverse effect on our business, prospects, financial condition, and operating results. These laws can give rise to liability for administrative oversight costs, cleanup costs, property damage, bodily injury, fines, and penalties. Capital and operating expenses needed to comply with environmental laws and regulations can be significant, and violations may result in substantial fines and penalties, third-party damages, suspension of production or a cessation of our operations.

Contamination at properties we own or operate, will own or operate, or formerly owned or operated or to which hazardous substances were sent by us, may result in liability for us under environmental laws and regulations, including,

57

but not limited to, the Comprehensive Environmental Response, Compensation and Liability Act, which can impose liability for the full amount of remediation-related costs without regard to fault, for the investigation and cleanup of contaminated soil and ground water, for impacts to human health and for damages to natural resources. The costs of complying with environmental laws and regulations and any claims concerning noncompliance, or liability with respect to contamination in the future, could have a material adverse effect on our financial condition or operating results. We may face unexpected delays in obtaining the required permits and approvals in connection with our planned RNG production facilities that could require significant time and financial resources and delay our ability to operate these facilities, which would adversely impact our business, prospects, financial condition and operating results.

Our operations entail inherent safety and environmental risks, which may result in substantial liability to us.

Our operations entail inherent safety risks, including risks associated with equipment defects, malfunctions, failures, and misuses. For example, operation of LNG pumps requires special training because of the extremely low temperatures of LNG. Also, LNG tanker trailers and CNG fuel tanks and trailers could rupture if involved in accidents or improper maintenance or installation. Further, improper refueling of vehicles that use our fuels or operation of vehicle fueling stations could result in sudden releases of pressure that could cause explosions. In addition, our operations may result in the venting of methane, a potent greenhouse gas. These safety and environmental risks could result in uncontrollable flows of our fuels, fires, explosions, death, or serious injury, any of which may expose us to liability for personal injury, wrongful death, property damage, pollution and other environmental damage. We may incur substantial liability and costs if any such damages are not covered by insurance or are more than policy limits, or if environmental damage causes us to violate applicable greenhouse gas emissions or other environmental laws. Additionally, the occurrence of any of these events with respect to our fueling stations or our other operations could materially harm our business and reputation. Moreover, the occurrence of any of these events to any other organization in our vehicle fuel business could harm our industry generally by negatively affecting perceptions about, and adoption levels of, our vehicle fuels.

Risks Related to Our Common Stock

A significant portion of our outstanding common stock is owned or otherwise subject to acquisition by two equityholders, each of which may have interests that differ from the Company’s other stockholders and which now or in the future may be able to influence the Company’s corporate decisions, including a change of control.

After giving effect to the issuance of the Amazon Warrant, Total Marketing Services, S.E. (“TMS”), a wholly owned subsidiary of Total, owns 42,581,801 shares of our common stock, or 19.1% of our outstanding shares of common stock as of June 30, 2021 (excluding 7,898,021 shares of our common stock that are the subject of a voting agreement, dated May 9, 2018, among TMS, the Company and all of the Company’s directors and officers then in office); the Amazon Warrant is immediately exercisable by Amazon Holdings for shares of our common stock representing 4.999% of our outstanding common stock.  Subject to vesting of the Amazon Warrant, the Amazon Warrant will be exercisable for up to 19.999% of our outstanding common stock on a fully diluted basis (determined at the time of issuance of the Amazon Warrant), subject to certain anti-dilution provisions, and Amazon Holding’s beneficial ownership will initially be contractually limited to the Beneficial Ownership Limitation unless Amazon Holdings gives the Company sixty one (61) days’ notice that it is waiving such limitation. In addition, Total was granted certain special rights that our other stockholders do not have in connection with its acquisition of this ownership position, including the right to designate two individuals to serve as directors of our Company and a third individual to serve as an observer on certain of our board committees.

Total or other large stockholders may be able to influence or control matters requiring approval by our stockholders, including the election of directors and mergers, acquisitions, or other extraordinary transactions. Amazon, through ownership by Amazon Holdings, could become a large stockholder if the Amazon Warrant were to vest further through additional fuel purchases from the Company pursuant to the Fuel Agreement, and Amazon Holdings were to exercise the Amazon Warrant to purchase vested Warrant Shares or Additional Warrant Shares and waive the Beneficial Ownership Limitation. Large stockholders may have interests that differ from other stockholders and may vote or otherwise act in ways with which the Company or other stockholders disagree or that may be adverse to other stockholders’ interests. A concentration of stock ownership may also have the effect of delaying, preventing or deterring a change of control of our Company, which could deprive our stockholders of an opportunity to receive a premium for their shares of

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our common stock as part of a sale of our Company and could affect the market price of our common stock. Conversely, such a concentration of stock ownership may facilitate a change of control under terms other stockholders may not find favorable or at a time when other stockholders may prefer not to sell.

Sales of our common stock, or the perception that such sales may occur, could cause the market price of our stock to drop significantly, regardless of the state of our business.

All outstanding shares of our common stock are eligible for sale in the public market, subject in certain cases to the requirements of Rule 144 under the Securities Act. Also, shares of our common stock that may be issued upon the exercise, vesting or conversion of our outstanding stock options and restricted stock units may be eligible for sale in the public market, to the extent permitted by Rule 144 and the provisions of the applicable stock option and restricted stock unit agreements or if such shares have been registered under the Securities Act.

Sales of large amounts of our common stock by large stockholders, or the perception that such sales may occur, could cause the market price of our common stock to decline, regardless of the state of the Company’s business. Our common stock held by TMS and our common stock underlying the Amazon Warrant may be sold in the public market under Rule 144 or in registered sales or offerings pursuant to registration rights held by each stockholder. For instance, we filed a registration statement with the SEC to cover the resale of the shares of our common stock issued and sold to TMS, which registration statement was declared effective in August 2018. If these shares are sold, or if it is perceived that they may be sold, in the public market, the trading price of our common stock could decline. For instance, in the six months ended June 30, 2021, TMS sold 8,274,495 shares of our common stock, which we believe caused downward pressure on the trading price of our common stock.

General Risk Factors

We rely on information technology in our operations, and any material failure, inadequacy, interruption, or security failure of that technology could harm our business.  

Increased global IT security threats and more sophisticated and targeted computer crime pose a risk to the security of our systems and networks and the confidentiality, availability and integrity of our data. There have been several recent, highly publicized cases in which organizations of various types and sizes have reported the unauthorized disclosure of customer or other confidential information, as well as cyberattacks involving the dissemination, theft and destruction of corporate information, intellectual property, cash or other valuable assets. There have also been several highly publicized cases in which hackers have requested “ransom” payments in exchange for not disclosing customer or other confidential information or for not disabling the target company’s computer or other systems. Implementing security measures designed to prevent, detect, mitigate or correct these or other IT security threats involves significant costs. Although we have taken steps to protect the security of our information systems and the data maintained in those systems, we have, from time to time, experienced threats to our data and systems, including malware and computer virus attacks, and it is possible that in the future our safety and security measures will not prevent the systems’ improper functioning or damage, or the improper access or disclosure of personally identifiable information such as in the event of cyberattacks. Any IT security threats that are successful against our security measures could, depending on their nature and scope, lead to the compromise of confidential information, improper use of our systems and networks, manipulation and destruction of data, operational disruptions, and substantial financial outlays. Further, a cyberattack could occur and persist for an extended period of time without detection, and an investigation of any successful cyberattack would likely require significant time, costs and other resources to complete. We may be required to expend significant financial resources to protect against or to remediate such cyberattacks. In addition, our technology infrastructure and information systems are vulnerable to damage or interruption from natural disasters, power loss and telecommunications failures. Any failure to maintain proper function, security and availability of our information systems and the data maintained in those systems could interrupt our operations, damage our reputation, subject us to liability claims or regulatory penalties, harm our business relationships or increase our security and insurance costs, which could have a material adverse effect on our business, financial condition and results of operations.

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The price of our common stock may continue to fluctuate significantly, and you could lose all or part of your investment.

The market price of our common stock has experienced, and may continue to experience, significant volatility. Factors that may cause volatility in the price of our common stock, many of which are beyond our control, include, among others, the following: (i) the factors that may influence the adoption of our vehicle fuels, as discussed elsewhere in these risk factors; (ii) our ability to implement our business plans and initiatives and their anticipated, perceived or actual level of success; (iii) failure to meet or exceed any financial guidance we have provided to the public or the estimates and projections of the investment community; (iv) the market’s perception of the success and importance of any of our acquisitions, divestitures, investments or other strategic relationships or transactions; (v) the amount of and timing of sales of, and prices for, Environmental Credits; (vi) actions taken by state or federal governments to mandate or otherwise promote or incentivize alternative vehicles or vehicle fuels over, or to the exclusion of, RNG; (vii) technical factors in the public trading market for our common stock that may produce price movements that may or may not comport with macro, industry or company-specific fundamentals, including, without limitation, the sentiment of retail investors (including as may be expressed on financial trading and other social media sites), the amount and status of short interest in our common stock, access to margin debt, and trading in options and other derivatives on our common stock; (viii) changes in political, regulatory, health, economic and market conditions; and (ix) a change in the trading volume of our common stock

In addition, the securities markets have from time-to-time experienced significant price and volume fluctuations that are unrelated to the operating performance of particular companies, but which have affected the market prices of these companies’ securities. These market fluctuations may also materially and adversely affect the market price of our common stock.

Volatility or declines in the market price of our common stock could have other negative consequences, including, among others, further impairments to our assets (following the asset impairment charges we recorded in the third and fourth quarters of 2017 related to our former fueling compressor manufacturing business and our closure of certain fueling stations), potential impairments to our goodwill and a reduced ability to use our common stock for capital-raising, acquisitions or other purposes. The occurrence of any of these risks could materially and adversely affect our financial condition, results of operations and liquidity and could cause further declines in the market price of our common stock.

Item 2.—Unregistered Sales of Equity Securities and Use of Proceeds

As a result of the issuance of additional shares of Common Stock under the ATM Programs and in accordance with the terms of the Amazon Warrant, on June 14, 2021, the number of shares of our Common Stock that may be purchased pursuant to the Amazon Warrant, at an exercise price of $13.49 per share, increased by an aggregate of 5,625,959 shares (the “Additional Warrant Shares”). The Additional Warrant Shares vest in multiple tranches, the first of which for 1,406,490 Additional Warrant Shares vested on June 14, 2021. Subsequent tranches of the Additional Warrant Shares will vest over time based on fuel purchases by Amazon and its affiliates, in accordance with the schedule in the Amazon Warrant. See Note 14 for additional information. The Amazon Warrant, and the shares of our Common Stock that may be purchased pursuant to such warrant, have not been registered under the Securities Act or under any state securities law and were offered and issued, as applicable, in reliance upon the exemption from registration requirements of the Securities Act set forth in Section 4(a)(2) of the Securities Act.

Item 3.—Defaults Upon Senior Securities

None.

Item 4.—Mine Safety Disclosures

None.

Item 5.—Other Information

None.

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Item 6.—Exhibits

The information required by this Item 6 is set forth on the Exhibit Index that immediately precedes the signature page to this report and is incorporated herein by reference.

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EXHIBIT INDEX

Exhibit Number	Description
3.1	Certificate of Amendment to Restated Certificate of Incorporation, dated June 14, 2021 (incorporated by reference to Exhibit 3.1 to Clean Energy Fuels Corp’s Current Report on Form 8-K filed with the SEC on June 15, 2021).
4.4†	Warrant to Purchase Common Stock of Clean Energy Fuels Corp., between Clean Energy Fuels Corp. and Amazon.com NV Investment Holdings LLC, dated as of April 16, 2021 (incorporated by reference to Exhibit 4.4 to Clean Energy Fuels Corp’s Current Report on Form 8-K filed with the SEC on April 19, 2021).
31.1*	Certification of Andrew J. Littlefair, President and Chief Executive Officer, pursuant to Rule 13a-14(a) or 15d-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Robert M. Vreeland, Chief Financial Officer, pursuant to Rule 13a-14(a) or 15d-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certification of Andrew J. Littlefair, President and Chief Executive Officer, and Robert M. Vreeland, Chief Financial Officer, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101*	The following materials from the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2021, formatted in iXBRL (Inline eXtensible Business Reporting Language):
	(i) Condensed Consolidated Balance Sheets as of December 31, 2020 and June 30, 2021;
	(ii) Condensed Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2020 and 2021;
	(iii) Condensed Consolidated Statements of Comprehensive Loss for the Three and Six Months Ended June 30, 2020 and 2021;
	(iv) Condensed Consolidated Statements of Stockholders’ Equity for the Three and Six Months Ended June 30, 2020 and 2021;
	(v) Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2020 and 2021; and
	(vi) Notes to Condensed Consolidated Financial Statements.
104*	Cover Page Interactive Data File (formatted as iXBRL and contained in Exhibit 101).

*     Filed herewith.

**   Furnished herewith.

† Certain portions of this document have been omitted pursuant to a request for confidential treatment and the non-public information has been filed separately with the Securities and Exchange Commission.

†† Certain portions of this document that constitute confidential information have been redacted in accordance with Item 601(b)(10) of Regulation S-K.

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SIGNATURE

Pursuant to the 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.

	CLEAN ENERGY FUELS CORP.
Date: August 5, 2021	By:	/s/ ROBERT M. VREELAND
		Robert M. Vreeland
		Chief Financial Officer (Principal financial officer and duly authorized to sign on behalf of the registrant)

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EX-31.1

Exhibit 31.1

Certification

I, Andrew J. Littlefair, certify that:

1.           I have reviewed this quarterly report on Form 10-Q of Clean Energy Fuels Corp.; 

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(s) 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(s) 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: August 5, 2021

/s/ ANDREW J. LITTLEFAIR

Andrew J. Littlefair

President and Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certification

I, Robert M. Vreeland, certify that:

1.           I have reviewed this quarterly report on Form 10-Q of Clean Energy Fuels Corp.;

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(s) 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(s) 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: August 5, 2021

/s/ ROBERT M. VREELAND

Robert M. Vreeland

Chief Financial Officer

(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION REQUIRED BY

SECTION 1350 OF TITLE 18 OF THE UNITED STATES CODE

Each of the undersigned hereby certifies in his capacity as the specified officer of Clean Energy Fuels Corp. (the “Company”), pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that, to the best of his knowledge, the Quarterly Report on Form 10-Q of the Company for the quarter ended June 30, 2021 (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 (the “Exchange Act”), and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 5, 2021

/s/ ANDREW J. LITTLEFAIR

Andrew J. Littlefair

President and Chief Executive Officer

(Principal Executive Officer)

Date: August 5, 2021

/s/ ROBERT M. VREELAND

Robert M. Vreeland

Chief Financial Officer

(Principal Financial Officer)

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff on request.

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Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Entity File Number	001-33480
Entity Registrant Name	CLEAN ENERGY FUELS CORP.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	33-0968580
Entity Address, Address Line One	4675 MacArthur Court, Suite 800
Entity Address, City or Town	Newport Beach
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92660
City Area Code	949
Local Phone Number	437-1000
Title of 12(b) Security	Common stock
Trading Symbol	CLNE
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		222,992,133
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001368265
Amendment Flag	false

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 134,041	$ 108,977
Short-term investments	120,208	29,528
Accounts receivable, net of allowance of $1,335 and $1,184 as of December 31, 2020 and June 30, 2021, respectively	66,497	61,784
Other receivables	14,859	23,655
Inventory	27,968	28,100
Prepaid expenses and other current assets	19,973	9,404
Derivative assets, related party		1,591
Total current assets	383,546	263,039
Operating lease right-of-use assets	34,586	25,967
Land, property and equipment, net	274,686	290,911
Restricted cash	7,004	11,000
Notes receivable and other long-term assets, net	70,214	27,299
Long-term portion of derivative assets, related party		4,057
Investments in other entities	78,007	27,962
Goodwill	64,328	64,328
Intangible assets, net	171	464
Total assets	912,542	715,027
Current liabilities:
Current portion of debt	8,689	3,592
Current portion of finance lease obligations	807	840
Current portion of operating lease obligations	3,154	2,822
Accounts payable	18,031	17,310
Accrued liabilities	50,351	52,637
Deferred revenue	3,089	2,642
Derivative liabilities, related party	709
Total current liabilities	84,830	79,843
Total long-term debt	29,569	82,088
Long-term portion of finance lease obligations	2,593	2,552
Long-term portion of operating lease obligations	31,704	23,698
Long-term portion of derivative liabilities, related party	984
Other long-term liabilities	7,619	3,996
Total liabilities	157,299	192,177
Commitments and contingencies (Note 17)
Stockholders' equity:
Preferred stock, $0.0001 par value. 1,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value. 304,000,000 and 454,000,000 shares authorized; 198,491,204 shares and 222,966,955 shares issued and outstanding as of December 31, 2020 and June 30, 2021, respectively	22	20
Additional paid-in capital	1,511,742	1,191,791
Accumulated deficit	(764,932)	(678,096)
Accumulated other comprehensive loss	(373)	(209)
Total Clean Energy Fuels Corp. stockholders' equity	746,459	513,506
Noncontrolling interest in subsidiary	8,784	9,344
Total stockholders' equity	755,243	522,850
Total liabilities and stockholders' equity	$ 912,542	$ 715,027

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,184	$ 1,335
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	454,000,000	304,000,000
Common stock, issued (in shares)	222,966,955	198,491,204
Common stock, outstanding (in shares)	222,966,955	198,491,204

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Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues [Abstract]
Total revenue	$ 480	$ 59,874	$ 77,623	$ 145,880
Cost of sales (exclusive of depreciation and amortization shown separately below):
Change in fair value of derivative warrants		(445)		(40)
Selling, general and administrative	21,606	16,892	43,047	35,151
Depreciation and amortization	11,381	12,050	23,116	23,974
Total operating expenses	79,898	67,050	163,475	150,570
Operating loss	(79,418)	(7,176)	(85,852)	(4,690)
Interest expense	(1,002)	(1,841)	(2,438)	(4,051)
Interest income	240	273	494	654
Other income, net	166	2,287	844	2,462
Income (loss) from equity method investments	121	(502)	(305)	(357)
Loss before income taxes	(79,893)	(6,959)	(87,257)	(5,982)
Income tax expense	(56)	(78)	(139)	(156)
Net loss	(79,949)	(7,037)	(87,396)	(6,138)
Loss attributable to noncontrolling interest	282	301	560	1,106
Net loss attributable to Clean Energy Fuels Corp.	$ (79,667)	$ (6,736)	$ (86,836)	$ (5,032)
Net loss attributable to Clean Energy Fuels Corp. per share:
Basic (in dollars per share)	$ (0.38)	$ (0.03)	$ (0.43)	$ (0.02)
Diluted (in dollars per share)	$ (0.38)	$ (0.03)	$ (0.43)	$ (0.02)
Weighted-average common shares outstanding:
Basic and diluted (in shares)	207,047,221	200,670,137	203,043,580	202,831,346
Product revenue
Revenues [Abstract]
Total revenue	$ (8,965)	$ 50,426	$ 58,727	$ 126,128
Cost of sales (exclusive of depreciation and amortization shown separately below):
Cost of sales	41,294	33,054	86,102	79,727
Service revenue
Revenues [Abstract]
Total revenue	9,445	9,448	18,896	19,752
Cost of sales (exclusive of depreciation and amortization shown separately below):
Cost of sales	$ 5,617	$ 5,499	$ 11,210	$ 11,758

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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net loss	$ (79,949)	$ (7,037)	$ (87,396)	$ (6,138)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in 2020 and 2021	719	1,007	(161)	(914)
Unrealized gains (losses) on available-for-sale securities, net of $0 tax in 2020 and 2021	(3)	(1)	(3)	5
Total other comprehensive income (loss)	716	1,006	(164)	(909)
Comprehensive loss	(79,233)	(6,031)	(87,560)	(7,047)
Clean Energy Fuels Corp.
Net loss	(79,667)	(6,736)	(86,836)	(5,032)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in 2020 and 2021	719	1,007	(161)	(914)
Unrealized gains (losses) on available-for-sale securities, net of $0 tax in 2020 and 2021	(3)	(1)	(3)	5
Total other comprehensive income (loss)	716	1,006	(164)	(909)
Comprehensive loss	(78,951)	(5,730)	(87,000)	(5,941)
Noncontrolling Interest in Subsidiary
Net loss	(282)	(301)	(560)	(1,106)
Other comprehensive income (loss), net of tax:
Comprehensive loss	$ (282)	$ (301)	$ (560)	$ (1,106)

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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax	$ 0	$ 0	$ 0	$ 0
Unrealized gains on available-for sale securities, tax	$ 0	$ 0	$ 0	$ 0

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Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest in Subsidiary	Total
Beginning balance at Dec. 31, 2019	$ 20	$ 1,203,186	$ (668,232)	$ (1,566)	$ 9,621	$ 543,029
Beginning balance (in shares) at Dec. 31, 2019	204,723,055
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		194				194
Issuance of common stock (in shares)	871,010
Repurchase of common stock		(4,244)				(4,244)
Repurchase of common stock (in shares)	(2,810,449)
Stock-based compensation		1,054				1,054
Net income (loss)			1,704		(805)	899
Other comprehensive income (loss)				(1,915)		(1,915)
Increase in ownership in subsidiary		(1,388)			1,388
Ending balance at Mar. 31, 2020	$ 20	1,198,802	(666,528)	(3,481)	10,204	539,017
Ending balance (in shares) at Mar. 31, 2020	202,783,616
Beginning balance at Dec. 31, 2019	$ 20	1,203,186	(668,232)	(1,566)	9,621	543,029
Beginning balance (in shares) at Dec. 31, 2019	204,723,055
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(1,106)	(6,138)
Other comprehensive income (loss)						(909)
Ending balance at Jun. 30, 2020	$ 20	1,193,197	(673,264)	(2,475)	9,903	527,381
Ending balance (in shares) at Jun. 30, 2020	199,506,780
Beginning balance at Mar. 31, 2020	$ 20	1,198,802	(666,528)	(3,481)	10,204	539,017
Beginning balance (in shares) at Mar. 31, 2020	202,783,616
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		41				41
Issuance of common stock (in shares)	25,214
Repurchase of common stock		(6,406)				(6,406)
Repurchase of common stock (in shares)	(3,302,050)
Stock-based compensation		760				760
Net income (loss)			(6,736)		(301)	(7,037)
Other comprehensive income (loss)				1,006		1,006
Ending balance at Jun. 30, 2020	$ 20	1,193,197	(673,264)	(2,475)	9,903	527,381
Ending balance (in shares) at Jun. 30, 2020	199,506,780
Beginning balance at Dec. 31, 2020	$ 20	1,191,791	(678,096)	(209)	9,344	$ 522,850
Beginning balance (in shares) at Dec. 31, 2020	198,491,204					198,491,204
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		3,216				$ 3,216
Issuance of common stock (in shares)	1,323,814
Stock-based compensation		3,367				3,367
Net income (loss)			(7,169)		(278)	(7,447)
Other comprehensive income (loss)				(880)		(880)
Ending balance at Mar. 31, 2021	$ 20	1,198,374	(685,265)	(1,089)	9,066	521,106
Ending balance (in shares) at Mar. 31, 2021	199,815,018
Beginning balance at Dec. 31, 2020	$ 20	1,191,791	(678,096)	(209)	9,344	$ 522,850
Beginning balance (in shares) at Dec. 31, 2020	198,491,204					198,491,204
Increase (Decrease) in Stockholders' Equity
Repurchase of common stock (in shares)						0
Net income (loss)					(560)	$ (87,396)
Other comprehensive income (loss)						(164)
Ending balance at Jun. 30, 2021	$ 22	1,511,742	(764,932)	(373)	8,784	$ 755,243
Ending balance (in shares) at Jun. 30, 2021	222,966,955					222,966,955
Beginning balance at Mar. 31, 2021	$ 20	1,198,374	(685,265)	(1,089)	9,066	$ 521,106
Beginning balance (in shares) at Mar. 31, 2021	199,815,018
Increase (Decrease) in Stockholders' Equity
Issuance of common stock	$ 2	194,171				$ 194,173
Issuance of common stock (in shares)	23,151,937
Repurchase of common stock (in shares)						0
Stock-based compensation		3,419				$ 3,419
Stock-based sales incentive charges		115,778				115,778
Net income (loss)			(79,667)		(282)	(79,949)
Other comprehensive income (loss)				716		716
Ending balance at Jun. 30, 2021	$ 22	$ 1,511,742	$ (764,932)	$ (373)	$ 8,784	$ 755,243
Ending balance (in shares) at Jun. 30, 2021	222,966,955					222,966,955

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (87,396)	$ (6,138)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	23,116	23,974
Provision for credit losses and inventory	560	1,056
Stock-based compensation expense	6,786	1,814
Stock-based sales incentive charges	78,053
Change in fair value of derivative instruments	2,507	(4,205)
Amortization of discount and debt issuance cost	26	(103)
Loss (gain) on disposal of property and equipment	174	(2,298)
Loss on extinguishment of debt	25
Gain from sale of certain assets of subsidiary		(176)
Loss from equity method investments	305	357
Non-cash lease expense	1,470	1,373
Deferred income taxes	61	60
Changes in operating assets and liabilities:
Accounts and other receivables	2,211	73,904
Inventory	(732)	218
Prepaid expenses and other assets	(11,722)	365
Operating lease liabilities	(1,751)	(1,604)
Accounts payable	1,547	(10,572)
Deferred revenue	388	(8,787)
Accrued liabilities and other	(2,711)	(19,479)
Net cash provided by operating activities	12,917	49,759
Cash flows from investing activities:
Purchases of short-term investments	(177,981)	(45,293)
Maturities and sales of short-term investments	87,301	85,850
Purchases of and deposits on property and equipment	(7,888)	(6,354)
Disbursements for loans receivable	(3,828)	(40)
Payments on and proceeds from sales of loans receivable	224	1,226
Cash received from sale of certain assets of subsidiary, net	887	4,951
Investments in other entities	(50,669)
Proceeds from disposal of property and equipment	1,577	3,224
Net cash provided by (used in) investing activities	(150,377)	43,564
Cash flows from financing activities:
Issuance of common stock	203,923	235
Repurchase of common stock		(10,650)
Fees paid for issuance of common stock	(6,534)
Proceeds for Adopt-a-Port program	4,670
Proceeds from debt instruments	4,400	200
Proceeds from revolving line of credit	1,150
Repayments of borrowing under revolving line of credit	(650)
Repayments of debt instruments and finance lease obligations	(48,584)	(52,960)
Payments of debt extinguishment costs	(14)
Net cash (used in) provided by financing activities	158,361	(63,175)
Effect of exchange rates on cash, cash equivalents and restricted cash	167	(199)
Net increase in cash, cash equivalents and restricted cash	21,068	29,949
Cash, cash equivalents and restricted cash, beginning of period	119,977	53,222
Cash, cash equivalents and restricted cash, end of period	141,045	83,171
Supplemental disclosure of cash flow information:
Income taxes paid	10	65
Interest paid, net of $98 and $0 capitalized, respectively	$ 2,460	$ 3,906

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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of Cash Flows [Abstract]
Interest paid, capitalized	$ 0	$ 98

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General

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

Note 1—General

Nature of Business

Clean Energy Fuels Corp., together with its majority and wholly owned subsidiaries (hereinafter collectively referred to as the “Company,” unless the context or the use of the term indicates or requires otherwise) is a leading renewable energy company focused on the procurement and distribution of renewable natural gas (“RNG”) and conventional natural gas, in the form of compressed natural gas (“CNG”) and liquefied natural gas (“LNG”), for the United States and Canadian transportation markets. The Company is also focused on developing, owning, and operating dairy and other livestock waste RNG projects and supplying RNG (procured from our own projects or from third parties) to its customers in the heavy and medium -duty commercial transportation sector.

As a comprehensive clean energy solution provider, the Company also designs and builds, as well as operates and maintains, public and private vehicle fueling stations in the United States and Canada; sells and services compressors and other equipment used in RNG production and at fueling stations; transports and sells its fuels via “virtual” natural gas pipelines and interconnects; sells U.S. federal, state and local government credits it generates by selling RNG as a vehicle fuel, including Renewable Identification Numbers (“RIN Credits” or “RINs”) under the federal Renewable Fuel Standard Phase 2 and credits under the California and the Oregon Low Carbon Fuel Standards (collectively, “LCFS Credits”); and obtains federal, state and local tax credits, grants and incentives.

Basis of Presentation

The accompanying interim unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries, and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s consolidated financial position as of June 30, 2021, results of operations, comprehensive loss, and stockholders’ equity for the three and six months ended June 30, 2020 and 2021, and cash flows for the six months ended June 30, 2020 and 2021. All intercompany accounts and transactions have been eliminated in consolidation. The results of operations for the three and six month periods ended June 30, 2020 and 2021 are not necessarily indicative of the results to be expected for the year ending December 31, 2021 or for any other interim period or any future year.

Certain information and disclosures normally included in the notes to consolidated financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”), but the resultant disclosures contained herein are in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as they apply to interim reporting. The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements as of and for the year ended December 31, 2020 that are included in the Company’s Annual Report on Form 10-K filed with the SEC on March 9, 2021.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying condensed consolidated financial statements and these notes. Actual results could differ from those estimates and may result in material effects on the Company’s operating results and financial position. Significant estimates made in preparing the accompanying condensed consolidated financial statements include (but are not limited to) those related to revenue recognition, fair value measurements, goodwill and long-lived asset valuations and impairment assessments, income tax valuations, stock-based compensation expense and stock-based sales incentive charges.

Amazon Warrant

The Amazon Warrant (defined in Note 14) is accounted for as an equity instrument and measured in accordance with Accounting Standards Codification (“ASC”) 718, Compensation – Stock Compensation. This instrument is classified in the condensed consolidated statements of operations in accordance with ASC 606, Revenue from Contracts with Customers. For awards granted to a customer, which are not in exchange for distinct goods or services, the fair value of the awards earned based on service or performance conditions is recorded as a reduction of the transaction price, in accordance with ASC 606. To determine the fair value of the Amazon Warrant in accordance with ASC 718, the Company used the Black-Scholes option pricing model which is based in part on assumptions that require management to use judgment. Based on the fair value of the award, the Company determines the amount of non-cash stock-based sales incentive charges on the customer’s pro-rata achievement of vesting conditions, which is recorded as a reduction of revenue in the condensed consolidated statements of operations. See Note 14 for additional information.

Recently Adopted Accounting Pronouncements

In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The new standard clarifies and simplifies the accounting for income taxes, including guidance related to intraperiod tax allocation, the recognition of deferred tax liabilities for outside basis differences, the methodology for calculating income taxes in an interim period, and the application of income tax guidance to franchise taxes that are partially based on income. The Company adopted this standard in the first quarter of 2021. Adoption of this ASU did not have a material impact on the Company’s condensed consolidated financial statements.

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Revenue from Contracts with Customers

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Note 2—Revenue from Contracts with Customers

Revenue Recognition Overview

The Company recognizes revenue when control of the promised goods or services is transferred to its customers, in an amount that reflects the consideration to which it expects to be entitled in exchange for the goods or services. To achieve that core principle, a five-step approach is applied: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue allocated to each performance obligation when the Company satisfies the performance obligation. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account for revenue recognition.

The Company is generally the principal in its customer contracts because it has control over the goods and services prior to their transfer to the customer, and as such, revenue is recognized on a gross basis. Sales and usage-based taxes are excluded from revenue. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. The table below presents the Company’s revenue disaggregated by revenue source (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Volume-related (1) (2)	$	50,231	$	(10,829)	$	125,290	$	57,297
Station construction sales		5,277		6,071		10,800		10,606
AFTC (3)		4,366		5,238		9,790		9,720
Total revenue	$	59,874	$	480	$	145,880	$	77,623

(1) Includes changes in fair value of derivative instruments related to the Company’s commodity swap and customer fueling contracts associated with the Company’s Zero Now truck financing program. The amounts are classified as revenue because the Company’s commodity swap contracts are used to economically offset the risk associated with the diesel-to-natural gas price spread resulting from customer fueling contracts under the Company’s Zero Now truck financing program. See Note 6 for more information about these derivative instruments. For the three and six months ended June 30, 2020, aggregate changes in the fair value of commodity swaps and customer fueling contracts amounted to a loss of $1.5 million and a gain of $4.2 million, respectively. For the three and six months ended June 30, 2021, aggregate changes in the fair value of commodity swaps and customer fueling contracts amounted to a loss of $0.5 million and $2.5 million, respectively.

(2) Includes $78.1 million of non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant for the three and six months ended June 30, 2021. See Note 14 for more information.

(3) Represents the federal alternative fuel excise tax credit that we refer to as “AFTC,” which was extended for vehicle fuel sales made beginning January 1, 2021 through December 31, 2021.  See Note 19 for more information.

Remaining Performance Obligations

Remaining performance obligations represent the transaction price of customer orders for which the work has not been performed. As of June 30, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was $12.9 million, which related to the Company’s station construction sale contracts. The Company expects to recognize revenue on the remaining performance obligations under these contracts over the next 12 to 24 months.

For volume-related revenue, the Company has elected to apply an optional exemption, which waives the requirement to disclose the remaining performance obligation for revenue recognized through the ‘right to invoice’ practical expedient.

Contract Balances

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) in the accompanying condensed consolidated balance sheets.

As of December 31, 2020 and June 30, 2021, the Company’s contract balances were as follows (in thousands):

	December 31,		June 30,
	2020		2021
Accounts receivable, net	$	61,784	$	66,497
Contract assets - current	$	729	$	741
Contract assets - non-current		3,998		3,757
Contract assets - total	$	4,727	$	4,498
Contract liabilities - current	$	1,638	$	1,006
Contract liabilities - non-current		59		—
Contract liabilities - total	$	1,697	$	1,006

Accounts Receivable, Net

"Accounts receivable, net" in the accompanying condensed consolidated balance sheets includes amounts billed and currently due from customers. The amounts due are stated at their net estimated realizable value. The Company maintains an allowance to provide for the estimated amount of receivables that will not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables, and economic conditions that may affect a customer’s ability to pay.

Contract Assets

Contract assets include unbilled amounts typically resulting from the Company’s station construction sale contracts, when the cost-to-cost method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the customer, and right to payment is not just subject to the passage of time. Amounts may not exceed their net realizable value. Contract assets are classified as current or noncurrent based on the timing of billings. The current portion is included in “Prepaid expenses and other current assets” and the noncurrent portion is included in “Notes receivable and other long-term assets, net” in the accompanying condensed consolidated balance sheets.

Contract Liabilities

Contract liabilities consist of billings in excess of revenue recognized from the Company’s station construction sale contracts and payments received primarily from customers of NG Advantage, LLC (“NG Advantage”) in advance of the performance obligations and are classified as current or noncurrent based on when the related revenue is expected to be recognized. The current portion and noncurrent portion of contract liabilities are included in “Deferred revenue” and “Other long-term liabilities,” respectively, in the accompanying condensed consolidated balance sheets.

Revenue recognized during the six months ended June 30, 2020 related to the Company’s contract liability balances as of December 31, 2019 was $4.2 million. The decrease in the contract liability balances for the six months ended June 30, 2021 is primarily driven by $1.5 million of revenue recognized related to the Company’s contract liability balances as of December 31, 2020, offset by billings in excess of revenue recognized.

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Investments in Other Entities and Noncontrolling Interest in a Subsidiary

6 Months Ended

Jun. 30, 2021

Investments, All Other Investments [Abstract]

Investments in Other Entities and Noncontrolling Interest in a Subsidiary

Note 3— Investments in Other Entities and Noncontrolling Interest in a Subsidiary

Total Joint Venture

On March 3, 2021, the Company entered an agreement (“Total JV Agreement”) with Total S.E. (“Total”) that created a 50/50 joint venture (“Total JV”) to develop anaerobic digester gas (“ADG”) RNG production facilities in the United States. The Total JV Agreement contemplates that the Total JV will invest up to $400.0 million of equity in production projects, and Total and the Company each committed to initially provide $50.0 million for the Total JV (the “Total JV Equity Obligations”). To fund the Company’s Total JV Equity Obligations the Company has the option to borrow $20.0 million from Société Générale, a company incorporated as a société anonyme under the laws of France (“SG”), pursuant to the Credit Agreement (defined in Note 12). See Note 12 for additional information.

bp Joint Venture

On April 13, 2021, the Company entered an agreement (“bp JV Agreement”) with BP Products North America Inc. (“bp”) that created a 50/50 joint venture (“bpJV”) to develop, own and operate new ADG RNG production facilities in the United States. Pursuant to the bp JV Agreement, bp and the Company committed to provide $50.0 million and $30.0 million, respectively, with bp and the Company each receiving 30.0 million of Class A Units  in the bpJV and bp also receiving 20.0 million of Class B Units in the bpJV. bp’s initial $50.0 million contribution was made on April 13, 2021 and consisted of all unpaid principal outstanding under the loan agreement dated December 18, 2020 (see Note 12), pursuant to which bp advanced $50.0 million to the Company to fund capital costs and expenses incurred prior to formation of the bpJV, including capital costs and expenses for permitting, engineering, equipment, leases and feed stock rights. 100% of the RNG produced from the projects developed and owned by the bpJV will be provided to the vehicle fuels market pursuant to the Company’s marketing agreement with bp.

Pursuant to the bp JV Agreement, the Company had the option, exercisable prior to August 31, 2021 (the “bp Option”), to commit an additional $20.0 million to the bpJV upon which bp’s Class B Units convert into Class A Units. On June 21, 2021, the Company contributed $50.2 million to the bpJV, which consisted of (i) its initial contribution commitment of $30.0 million, (ii) the $20.0 million additional contribution to effect the conversion of bp’s Class B Units into Class A Units pursuant to the Company’s exercise of the bp Option, and (iii) $0.2 million for interest on bp’s Class B units to acquire additional Class A Units. As of June 30, 2021, the Company and bp each own 50% of the bp JV.

The Company accounts for its interest in the bpJV using the equity method of accounting because the Company does not control but has the ability to exercise significant influence over the bpJV’s operations. The Company recorded a loss of $0.1 million from this investment for the three and six months ended June 30, 2021 related to formation expenses. The Company had an investment balance in the bpJV of $50.0 million as of June 30, 2021.

SAFE&CEC S.r.l.

On November 26, 2017, the Company, through its former subsidiary IMW Industries Ltd. (formerly known as Clean Energy Compression Corp.) (“CEC”), entered into an investment agreement with Landi Renzo S.p.A. (“LR”), an

alternative fuels company based in Italy. Pursuant to the investment agreement, the Company and LR agreed to combine their respective natural gas compressor fueling systems manufacturing subsidiaries, CEC and SAFE S.p.A, in a new company, SAFE&CEC S.r.l. (such combination transaction is referred to as the “CEC Combination”). SAFE&CEC S.r.l. is focused on manufacturing, selling and servicing natural gas fueling compressors and related equipment for the global natural gas fueling market. As of the closing of the CEC Combination on December 29, 2017, the Company owns 49% of SAFE&CEC S.r.l., and LR owns 51% of SAFE&CEC S.r.l.

The Company accounts for its interest in SAFE&CEC S.r.l. using the equity method of accounting because the Company does not control but has the ability to exercise significant influence over SAFE&CEC S.r.l.’s operations. The Company recorded a loss of $0.5 million and a gain of $0.5 million from this investment for the three months ended June 30, 2020 and 2021, respectively, and a loss of $0.4 million and a gain of $0.1 million for the six months ended June 30, 2020 and 2021, respectively. The Company had an investment balance in SAFE&CEC S.r.l. of $24.7 million and $24.5 million as of December 31, 2020 and June 30, 2021, respectively.

NG Advantage

On October 14, 2014, the Company entered into a Common Unit Purchase Agreement (“UPA”) with NG Advantage for a 53.3% controlling interest in NG Advantage. NG Advantage is engaged in the business of transporting CNG in high-capacity trailers to industrial and institutional energy users, such as hospitals, food processors, manufacturers and paper mills that do not have direct access to natural gas pipelines. As of June 30, 2021, the Company’s controlling interest in NG Advantage was 93.3%.

The Company recorded a loss attributable to the noncontrolling interest in NG Advantage of $0.3 million for each of the three months ended June 30, 2020 and 2021, and $1.1 million and $0.6 million for the six months ended June 30, 2020 and 2021, respectively. The value of the noncontrolling interest was $9.3 million and $8.8 million as of December 31, 2020 and June 30, 2021, respectively.

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Cash, Cash Equivalents, and Restricted Cash

6 Months Ended

Jun. 30, 2021

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents, and Restricted Cash

Note 4—Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents and restricted cash as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Current assets:
Cash and cash equivalents	$	108,977	$	134,041
Total cash and cash equivalents	$	108,977	$	134,041
Long-term assets:
Restricted cash - standby letters of credit	$	4,000	$	—
Restricted cash - held as collateral		7,000		7,004
Total restricted cash	$	11,000	$	7,004
Total cash, cash equivalents and restricted cash	$	119,977	$	141,045

The Company considers all highly liquid investments with maturities of three months or less on the date of acquisition to be cash equivalents.

The Company places its cash and cash equivalents with high credit quality financial institutions. At times, such balances may be in excess of the Federal Deposit Insurance Corporation (“FDIC”) and Canadian Deposit Insurance Corporation (“CDIC”) limits. Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash deposits. The amounts in excess of FDIC and CDIC limits were approximately $107.6 million and $132.7 million as of December 31, 2020 and June 30, 2021, respectively.

The Company classifies restricted cash as short-term and a current asset if the cash is expected to be used in operations within a year or to acquire a current asset. Otherwise, the restricted cash is classified as long-term.

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Short-Term Investments

6 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Short-Term Investments

Note 5—Short-Term Investments

Short-term investments include available-for-sale debt securities and certificates of deposit. Available-for-sale debt securities are carried at fair value, inclusive of unrealized gains and losses. Unrealized gains and losses on available-for-sale debt securities are recognized in other comprehensive income (loss), net of applicable income taxes. Gains or losses on sales of available-for-sale debt securities are recognized on the specific identification basis.

The Company reviews available-for-sale debt securities for declines in fair value below their cost basis each quarter and whenever events or changes in circumstances indicate that the cost basis of an asset may not be recoverable, and evaluates the current expected credit loss. This evaluation is based on a number of factors, including historical experience, market data, issuer-specific factors, economic conditions, and any changes to the credit rating of the security. As of June 30, 2021, the Company has not recorded a credit loss related to available-for-sale debt securities and believes the carrying values for its available-for-sale debt securities are properly recorded.

Short-term investments as of December 31, 2020 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Gain (Loss)		Fair Value
Municipal bonds and notes	$	28,998	$	—	$	28,998
Certificates of deposit		530		—		530
Total short-term investments	$	29,528	$	—	$	29,528

Short-term investments as of June 30, 2021 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Loss		Fair Value
Municipal bonds and notes	$	2,027	$	(1)	$	2,026
Zero coupon bonds		117,654		(2)		117,652
Certificates of deposit		530		—		530
Total short-term investments	$	120,211	$	(3)	$	120,208

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Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

Note 6 - Derivative Instruments and Hedging Activities

In October 2018, the Company executed two commodity swap contracts with Total Gas & Power North America, an affiliate of Total and THUSA (as defined in Note 12), for a total of 5.0 million diesel gallons annually from April 1, 2019 to June 30, 2024. These commodity swap contracts are used to manage diesel price fluctuation risks related to the natural gas fuel supply commitments the Company makes in its fueling agreements with fleet operators that participate in the Zero Now truck financing program. These contracts are not designated as accounting hedges and as a result, changes in the fair value of these derivative instruments are recognized in "Product revenue" in the accompanying condensed consolidated statements of operations.

The Company has entered into fueling agreements with fleet operators under the Zero Now truck financing program. The fueling agreements contain a pricing feature indexed to diesel, which the Company determined to be embedded derivatives and recorded at fair value at the time of execution, with the changes in fair value of the embedded derivatives recognized in "Product revenue" in the accompanying condensed consolidated statements of operations.

Derivatives and embedded derivatives as of December 31, 2020 consisted of the following (in thousands):

	Gross Amounts		Gross Amounts		Net Amount
	Recognized		Offset		Presented
Assets:
Commodity swaps:
Current portion of derivative assets, related party	$	1,591	$	—	$	1,591
Long-term portion of derivative assets, related party		4,057		—		4,057
Fueling agreements:
Prepaid expenses and other current assets		249		—		249
Notes receivable and other long-term assets, net		542		—		542
Total derivative assets	$	6,439	$	—	$	6,439
Liabilities:
Fueling agreements:
Accrued liabilities	$	283	$	—	$	283
Other long-term liabilities		273		—		273
Total derivative liabilities	$	556	$	—	$	556

Derivatives and embedded derivatives as of June 30, 2021 consisted of the following (in thousands):

	Gross Amounts		Gross Amounts		Net Amount
	Recognized		Offset		Presented
Assets:
Commodity swaps:
Long-term portion of derivative assets, related party	$	263	$	(263)	$	—
Fueling agreements:
Prepaid expenses and other current assets		1,399		—		1,399
Notes receivable and other long-term assets, net		3,670		—		3,670
Total derivative assets	$	5,332	$	(263)	$	5,069
Liabilities:
Commodity swaps:
Current portion of derivative liabilities, related party	$	709	$	—	$	709
Long-term portion of derivative liabilities, related party		1,247		(263)		984
Total derivative liabilities	$	1,956	$	(263)	$	1,693

As of December 31, 2020 and June 30, 2021, the Company had a total volume on open commodity swap contracts of 16.9 million and 14.4 million diesel gallons, respectively, at a weighted-average price of approximately $3.18 per gallon.

The following table reflects the weighted-average price of open commodity swap contracts as of December 31, 2020 and June 30, 2021, by year with associated volumes:

	December 31, 2020			June 30, 2021
	Volumes	Weighted-Average Price per		Volumes	Weighted-Average Price per
Year	(Diesel Gallons)	Diesel Gallon		(Diesel Gallons)	Diesel Gallon
2021	5,000,000	$	3.18	2,500,000	$	3.18
2022	5,000,000	$	3.18	5,000,000	$	3.18
2023	5,000,000	$	3.18	5,000,000	$	3.18
2024	1,875,000	$	3.18	1,875,000	$	3.18

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Fair Value Measurements

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 7—Fair Value Measurements

The Company follows the authoritative guidance for fair value measurements with respect to assets and liabilities that are measured at fair value on a recurring basis and non-recurring basis. Under the standard, fair value is defined as the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction

between market participants, as of the measurement date. The standard also establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available in the circumstances. The hierarchy consists of the following three levels: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly; and Level 3 inputs are unobservable inputs for the asset or liability. Categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The Company’s available-for-sale debt securities and certificates of deposit are classified within Level 2 because they are valued using the most recent quoted prices for identical assets in markets that are not active and quoted prices for similar assets in active markets.

The Company used the income approach to value its outstanding commodity swap contracts and embedded derivatives in its fueling agreements under the Zero Now truck financing program (see Note 6). Under the income approach, the Company used a discounted cash flow (“DCF”) model in which cash flows anticipated over the term of the contracts are discounted to their present value using an expected discount rate. The discount rate used for cash flows reflects the specific risks in spot and forward rates and credit valuation adjustments. This valuation approach is considered a Level 3 fair value measurement. The significant unobservable inputs used in the fair value measurement of the Company’s derivative instruments are Ultra-Low Sulfur Diesel (“ULSD”) forward prices and differentials from ULSD to Petroleum Administration for Defense District (“PADD”) regions. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the ULSD forward prices is accompanied by a directionally opposite but less extreme change in the ULSD-PADD differential.

The Company estimated the fair value of its outstanding commodity swap contracts based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

The Company estimated the fair value of embedded derivatives in its fueling agreements under the Zero Now truck financing program based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

There were no transfers of assets or liabilities between Level 1, Level 2, or Level 3 of the fair value hierarchy as of December 31, 2020 or June 30, 2021.

The following tables provide information by level for assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2020 and June 30, 2021 (in thousands):

	December 31, 2020		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities (1):
Municipal bonds and notes	$	28,998	$	—	$	28,998	$	—
Certificates of deposit (1)		530		—		530		—
Commodity swap contracts (2)		5,648		—		—		5,648
Embedded derivatives (3)		791		—		—		791
Liabilities:
Embedded derivatives (3)	$	556	$	—	$	—	$	556

	June 30, 2021		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities (1):
Municipal bonds and notes	$	2,026	$	—	$	2,026	$	—
Zero coupon bonds		117,652		—		117,652		—
Certificates of deposit (1)		530		—		530		—
Embedded derivatives (3)		5,069		—		—		5,069
Liabilities:
Commodity swap contracts (2)	$	1,693	$	—	$	—	$	1,693

(1) Included in "Short-term investments" in the accompanying condensed consolidated balance sheets. See Note 5 for more information.

(2) Included in "Derivative assets, related party" and "Long-term portion of derivative assets, related party" as of December 31, 2020, and "Derivative liabilities, related party" and "Long-term portion of derivative liabilities, related party" as of June 30, 2021 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.

(3) Included in "Prepaid expenses and other current assets," “Notes receivable and other long-term assets, net," “Accrued liabilities” and “Other long-term liabilities” as of December 31, 2020, and "Prepaid expenses and other current assets" and “Notes receivable and other long-term assets, net" as of June 30, 2021 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.

The following tables provide a reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis as shown in the tables above that used significant unobservable inputs (Level 3), as well as the change in unrealized gains or losses for the periods included in earnings (in thousands):

	Assets:		Assets:		Liabilities:		Liabilities:
	Commodity		Embedded		Commodity		Embedded		Liabilities:
	Swap Contracts		Derivatives		Swap Contracts		Derivatives		Warrants
Balance as of March 31, 2020	$	12,545	$	143	$	—	$	(3,308)	$	(445)
Settlements, net		(453)		—		—		—		—
Total gain (loss)		(2,349)		(49)		—		1,384		445
Balance as of June 30, 2020	$	9,743	$	94	$	—	$	(1,924)	$	—
Balance as of March 31, 2021	$	1,347	$	2,521	$	—	$	(30)	$	—
Settlements, net		—		—		310		—		—
Total gain (loss)		(1,347)		2,548		(2,003)		30		—
Balance as of June 30, 2021	$	—	$	5,069	$	(1,693)	$	—	$	—
Change in unrealized gain (loss) for the three months ended June 30, 2020 included in earnings	$	(2,802)	$	(49)	$	—	$	1,384	$	445
Change in unrealized gain (loss) for the three months ended June 30, 2021 included in earnings	$	(1,347)	$	2,548	$	(1,693)	$	30	$	—

	Assets:		Assets:		Liabilities:		Liabilities:
	Commodity		Embedded		Commodity		Embedded		Liabilities:
	Swap Contracts		Derivatives		Swap Contracts		Derivatives		Warrants
Balance as of December 31, 2019	$	3,270	$	723	$	(164)	$	(81)	$	(40)
Settlements, net		(477)		—		56		—		—
Total gain (loss)		6,950		(629)		108		(1,843)		40
Balance as of June 30, 2020	$	9,743	$	94	$	—	$	(1,924)	$	—
Balance as of December 31, 2020	$	5,648	$	791	$	—	$	(556)	$	—
Settlements, net		(225)		—		349		—		—
Total gain (loss)		(5,423)		4,278		(2,042)		556		—
Balance as of June 30, 2021	$	—	$	5,069	$	(1,693)	$	—	$	—
Change in unrealized gain (loss) for the six months ended June 30, 2020 included in earnings	$	6,473	$	(629)	$	164	$	(1,843)	$	40
Change in unrealized gain (loss) for the six months ended June 30, 2021 included in earnings	$	(5,648)	$	4,278	$	(1,693)	$	556	$	—

Other Financial Assets and Liabilities

The carrying amounts of the Company’s cash, cash equivalents and restricted cash, receivables and payables approximate fair value due to the short-term nature of those instruments. The carrying amounts of the Company’s debt instruments approximated their respective fair values as of December 31, 2020 and June 30, 2021. The fair values of these debt instruments were estimated using a DCF analysis based on interest rates offered on loans with similar terms to borrowers of similar credit quality, which are Level 3 inputs. See Note 12 for more information about the Company’s debt instruments.

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Other Receivables

6 Months Ended

Jun. 30, 2021

Receivables [Abstract]

Other Receivables

Note 8—Other Receivables

Other receivables as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Loans to customers to finance vehicle purchases	$	394	$	402
Accrued customer billings		6,335		6,527
Fuel tax credits		10,556		5,335
Other		6,370		2,595
Total other receivables	$	23,655	$	14,859

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Inventory

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Inventory

Note 9—Inventory

Inventory consists of raw materials and spare parts, work in process and finished goods and is stated at the lower of cost (first-in, first-out) or net realizable value. The Company evaluates inventory balances for excess quantities and obsolescence by analyzing estimated demand, inventory on hand, sales levels and other information, and reduces inventory balances to net realizable value for excess and obsolete inventory based on this analysis.

Inventory as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Raw materials and spare parts	$	28,100	$	27,968
Total inventory	$	28,100	$	27,968

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Land, Property and Equipment

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Land, Property and Equipment

Note 10—Land, Property and Equipment

Land, property and equipment, net as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Land	$	3,476	$	3,476
LNG liquefaction plants		94,633		94,633
Station equipment		344,839		346,594
Trailers		79,860		77,437
Other equipment		89,276		90,212
Construction in progress		73,272		76,212
		685,356		688,564
Less accumulated depreciation		(394,445)		(413,878)
Total land, property and equipment, net	$	290,911	$	274,686

Included in "Land, property and equipment, net" are capitalized software costs of $32.3 million and $33.2 million as of December 31, 2020 and June 30, 2021, respectively. Accumulated amortization of the capitalized software costs is $28.8 million and $29.7 million as of December 31, 2020 and June 30, 2021, respectively.

The Company recorded amortization expense related to capitalized software costs of $0.6 million and $0.4 million for the three months ended June 30, 2020 and 2021, respectively, and $1.3 million and $0.9 million for the six months ended June 30, 2020 and 2021, respectively.

As of June 30, 2020 and 2021, $1.5 million and $0.9 million, respectively, is included in "Accounts payable" and "Accrued liabilities," which amounts are related to purchases of property and equipment. These amounts are excluded from the accompanying condensed consolidated statements of cash flows as they are non-cash investing activities.

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Accrued Liabilities

6 Months Ended

Jun. 30, 2021

Payables and Accruals [Abstract]

Accrued Liabilities

Note 11—Accrued Liabilities

Accrued liabilities as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Accrued alternative fuels incentives (1)	$	18,175	$	17,911
Accrued employee benefits		4,282		3,754
Accrued gas and equipment purchases		9,897		9,847
Accrued interest		512		411
Accrued property and other taxes		3,094		3,385
Accrued salaries and wages		7,646		4,197
Embedded derivatives		283		—
Other (2)		8,748		10,846
Total accrued liabilities	$	52,637	$	50,351

(1) Includes the amount of RINs, LCFS Credits and the amount of AFTC payable to third parties.

(2) No individual item in “Other” exceeds 5% of total current liabilities.

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Debt

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Debt

Note 12—Debt

Debt obligations as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31, 2020
			Unamortized Debt		Balance, Net of
	Principal Balance		Financing Costs		Financing Costs
bp Loan	$	50,000	$	—	$	50,000
NG Advantage debt		29,535		117		29,418
SG Facility		5,100		—		5,100
Other debt		1,162		—		1,162
Total debt		85,797		117		85,680
Less amounts due within one year		(3,631)		(39)		(3,592)
Total long-term debt	$	82,166	$	78	$	82,088

	June 30, 2021
			Unamortized Debt		Balance, Net of
	Principal Balance		Financing Costs		Financing Costs
NG Advantage debt	$	27,861	$	86	$	27,775
SG Facility		9,500		—		9,500
Other debt		983		—		983
Total debt		38,344		86		38,258
Less amounts due within one year		(8,718)		(29)		(8,689)
Total long-term debt	$	29,626	$	57	$	29,569

SG Credit Agreement

On January 2, 2019, the Company entered into a term credit agreement (the “Credit Agreement”) with SG. The Credit Agreement provides for a term loan facility (the “SG Facility”) pursuant to which the Company may obtain, subject to certain conditions, up to $100.0 million of loans (“SG Loans”) in support of its Zero Now truck financing program. Under the Credit Agreement, the Company is permitted to use the proceeds from the SG Loans to fund the incremental cost of trucks purchased or financed under the Zero Now truck financing program and related fees and expenses incurred by the Company in connection therewith. On March 12, 2021, the Credit Agreement was amended to permit the Company to use up to $45.0 million of proceeds from the SG Loans to fund certain station build costs, and up to $20.0 million to fund Total JV Equity Obligations. Interest on outstanding SG Loans accrues at a rate equal to LIBOR plus 1.30% per annum, and a commitment fee on any unused portion of the SG Facility accrues at a rate equal to 0.39% per annum. Interest and commitment fees are payable quarterly.

The Company is required to make quarterly principal payments of $2.5 million beginning March 31, 2022 with any unpaid amount due on January 2, 2024, subject to the option to extend the maturity date for three successive terms of one year each. The Company is required to make mandatory prepayments under the SG Facility equal to any amounts the Company receives for complete or partial refunds of the incremental cost of trucks purchased or financed under the Zero Now program, and the Company is generally permitted to make complete or partial voluntary prepayments under the SG Facility with prior written notice to SG without premium or penalty. The Credit Agreement includes certain representations, warranties and covenants by the Company and also provides for customary events of default which, if any of them occurs, would permit or require, among other things, the principal and accrued interest on the SG Loans to become or to be declared due and payable. Events of default under the Credit Agreement include, among others, nonpayment of principal and interest when due; violation of covenants; any default by the Company (whether or not resulting in acceleration) under any other agreement for borrowed money in excess of $20.0 million; voluntary or involuntary bankruptcy; repudiation or assignment of the Guaranty by THUSA; or a change of control of the Company.

The Credit Agreement does not include financial covenants, and the Company has not provided SG with any security for its obligations under the Credit Agreement. As described below, THUSA has entered into the Guaranty to guarantee the Company’s payment obligations to SG under the Credit Agreement. As of June 30, 2021, the Company had $9.5 million outstanding on the SG Facility, and no events of defaults had occurred.

Total Credit Support Agreement

The Company entered into a credit support agreement with Total Holdings USA Inc. (“THUSA”), a wholly owned subsidiary of Total, on January 2, 2019, which was subsequently amended on March 12, 2021 (as amended, the “CSA”) in conjunction with the March 12, 2021 amendment to the Credit Agreement. Under the CSA, THUSA agreed to enter into a guaranty agreement (“Guaranty”) pursuant to which it has guaranteed the Company’s obligation to repay to SG up to $100.0 million in SG Loans and interest thereon in accordance with the Credit Agreement. In consideration for the commitments of THUSA under the CSA, the Company is required to pay THUSA a quarterly guaranty fee at a rate per quarter equal to 2.5% of the average aggregate SG Loan amount for the preceding calendar quarter.

Following any payment by THUSA to SG under the Guaranty, the Company would be obligated to immediately pay to THUSA the full amount of such payment plus interest on such amount at a rate equal to LIBOR plus 1.0%. In addition, the Company would be obligated to pay and reimburse THUSA for all reasonable out-of-pocket expenses it incurs in the performance of its services under the CSA, including all reasonable out-of-pocket attorneys’ fees and expenses incurred in connection with the payment to SG under the Guaranty or any enforcement or attempt to enforce any of the Company‘s obligations under the CSA. The CSA includes customary representations and warranties and affirmative and negative covenants by the Company. In addition, upon the occurrence of a “Trigger Event” and during its continuation, THUSA may, among other things: elect not to guarantee additional SG Loans; declare all or any portion of the outstanding amounts the Company owes THUSA under the CSA to be due and payable; and exercise all other rights it may have under applicable law. Each of the following events constitutes a Trigger Event: the Company defaults with respect to any payment obligation under the CSA; any representation or warranty made by the Company in the CSA was false, incorrect, incomplete or misleading in any material respect when made; the Company fails to observe or perform any material covenant, obligation, condition or agreement in the CSA; or the Company defaults in the observance or performance of any agreement, term or condition contained in any other agreement with THUSA or an affiliate of THUSA.

As security for the Company’s obligations under the CSA, on January 2, 2019, the Company entered into a pledge and security agreement with THUSA and delivered a collateral assignment of contracts to THUSA, pursuant to which the Company collaterally assigned to THUSA all fueling agreements it enters into with participants in the Zero Now truck financing program. In addition, on January 2, 2019, the Company entered into a lockbox agreement with THUSA and PlainsCapital Bank, under which the Company granted THUSA a security interest in the cash flow generated by the fueling agreements the Company enters into with participants in the Zero Now truck financing program.

Until the occurrence of a Trigger Event or Fundamental Trigger Event (as described below) under the CSA, the Company has the freedom to operate in the normal course, and there are no restrictions on the flow of funds in and out of the lockbox account established pursuant to the lockbox agreement. Upon the occurrence of a Trigger Event under the CSA, all funds in the lockbox account will be: first, used to make scheduled debt repayments under the Credit Agreement; and second, released to the Company. Further, upon the occurrence of a “Fundamental Trigger Event” under the CSA and during its continuation, in addition to exercising any of the remedies available to THUSA upon the occurrence of a Trigger Event as described above: all participants in the Zero Now program would pay amounts owed under their fueling agreements with the Company directly into the lockbox account; under a “sweep” mechanism, all cash in the lockbox account would be used to prepay all outstanding SG Loans under the Credit Agreement; no other disbursements from the lockbox account could be made without THUSA’s consent; THUSA would retain dominion over the lockbox account; and the funds in the account would remain as security for the Company’s payment and reimbursement obligations under the CSA. Each of the following events constitutes a Fundamental Trigger Event: the Company defaults in the observance or performance of any agreement, term or condition contained in the Credit Agreement that would constitute an event of default thereunder, up to or beyond any grace period provided in such agreement, unless waived by SG; the Company defaults in the observance or performance of any agreement, term or condition contained in any evidence of indebtedness other than the Credit Agreement, and the effect of such default is to cause, or permit the holders of such indebtedness to cause, acceleration of indebtedness in an aggregate amount for all such collective defaults of $20.0 million or more; voluntary and involuntary bankruptcy and insolvency events; and the occurrence of a change of control of the Company.

The CSA will terminate following the later of: the payment in full of all of the Company’s obligations under the CSA; and the termination or expiration of the Guaranty following the maturity date of the last outstanding SG Loan or December 31, 2023, whichever is earlier.

NG Advantage Debt

On November 30, 2016, NG Advantage entered into a Loan and Security Agreement (the “Wintrust LSA”) with Wintrust Commercial Finance (“Wintrust”), pursuant to which Wintrust agreed to lend NG Advantage $4.7 million. The proceeds were primarily used to fund the purchases of CNG trailers and equipment. Interest and principal are payable monthly in 72 equal monthly installments at an annual rate of 5.17%. As collateral security for the prompt payment in full when due of NG Advantage’s obligations to Wintrust under the Wintrust LSA, NG Advantage pledged to and granted Wintrust a security interest in all of its right, title and interest in the CNG trailers and equipment purchased with the proceeds received under the Wintrust LSA.

On December 10, 2020, NG Advantage entered an Amended and Restated Loan and Security Agreement with Berkshire Bank (“Berkshire ALA”) to substitute and replace the two existing loans with Berkshire Bank dated May 12, 2016 and January 24, 2017 (collectively, the “Original Debt”). The Berkshire ALA provides NG Advantage a 5-year term loan of $14.5 million with payments of principal and interest due monthly beginning February 1, 2021 at an annual interest rate of 5%, maturing on January 1, 2026. NG Advantage used the funds provided by the Berkshire ALA to repay in full the outstanding principal balance plus accrued and unpaid interest of the Original Debt, and to repay the outstanding balances of certain other financing obligations to unrelated lenders. NG Advantage has pledged as collateral certain assets and equipment including trailers under the Berkshire ALA, and the Company has provided a limited guaranty of up to $7.0 million classified in “Restricted cash” on the accompanying condensed consolidated balance sheet. As of June 30, 2021, the Company was in compliance with the covenants under the Berkshire ALA.

The Berkshire ALA also provides NG Advantage a $1.0 million revolving line of credit which bears interest at the greater of the Prime Rate or 3.00%, plus 0.25% and has a maturity date of July 31, 2022. As of June 30, 2021, NG Advantage had $0.5 million outstanding on the revolving line of credit which is classified in “Long-term portion of debt” in the accompanying condensed consolidated balance sheet. As of June 30, 2021, the interest rate on the revolving line of credit was 3.50% (the Prime Rate (3.25% as of June 30, 2021) plus 0.25%).

Financing Obligations

NG Advantage has entered into sale and leaseback transactions with various lessors as described below. In each instance, the sale and leaseback transaction does not qualify for sale-leaseback accounting because of NG Advantage’s continuing involvement with the buyer-lessor due to a fixed price repurchase option. As a result, the transactions are recorded under the financing method, in which the assets remain on the accompanying condensed consolidated balance sheets and the proceeds from the transactions are recorded as financing liabilities.

On December 18, 2017, NG Advantage entered into a sale-leaseback arrangement through a Master Lease Agreement (the “BoA MLA”) with Bank of America Leasing & Capital, LLC (“BoA”). Pursuant to the BoA MLA, NG Advantage received $2.1 million in cash for CNG trailers and simultaneously leased them back from BoA for five years commencing January 1, 2018 with interest and principal payable in 60 equal monthly installments at an annual rate of 4.86%.

On March 1, 2018, NG Advantage entered into a sale-leaseback arrangement through a Master Lease Agreement (the “First National MLA”) with First National Capital, LLC (“First National”). Pursuant to the First National MLA, NG Advantage received $6.3 million in cash, net of fees and the first month’s lease payment for CNG trailers and simultaneously leased them back from First National for six years commencing March 1, 2018 with interest and principal payable in 72 equal monthly installments at an annual rate of 9.28%.

On December 20, 2018 (the “Closing Date”), NG Advantage entered into a purchase agreement to sell a compression station for a purchase price of $7.0 million to an entity whose member owners were noncontrolling interest member owners of NG Advantage. On the Closing Date and immediately following the consummation of the sale of the compression station, NG Advantage entered into a lease agreement with the buyer of the station pursuant to which the station was leased back to NG Advantage for a term of five years with monthly rent payments equal to $0.1 million at an annual rate of 12.0%.

bp Loan

On December 18, 2020, the Company entered a Memorandum of Understanding (“MOU”) with bp to create the bpJV. Contemporaneous with the execution of the MOU, the Company and bp executed a loan agreement whereby bp advanced $50.0 million (“bp Loan”) to fund capital costs and expenses incurred prior to formation of the bpJV. The bp Loan bore interest at the rate per annum equal to LIBOR plus 4.33%. As repayment of the bp Loan, the outstanding principal balance was contributed to the bpJV in April 2021 upon entering into the bp JV Agreement. See Note 3 for additional information.

Plains Credit Facility

On May 1, 2021, the Company entered into a Loan and Security Agreement (the “Plains LSA”) with PlainsCapital Bank (“Plains”), which provides the Company a $20.0 million revolving line of credit through May 1, 2022. The interest rate on amounts outstanding under the Plains LSA is the greater of the Prime Rate or 3.25%. As of June 30, 2021, no amounts were  outstanding under the Plains LSA. As of June 30, 2021, the Company was in compliance with the covenants under the Plains LSA.

Other Debt

The Company has other debt due at various dates through 2024 bearing interest at rates up to 4.75% with a weighted-average interest rate of 4.38% and 4.37% as of December 31, 2020 and June 30, 2021, respectively.

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Net Income (Loss) Per Share

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Note 13—Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing the net income (loss) attributable to Clean Energy Fuels Corp. by the weighted-average number of common shares outstanding and common shares issuable for little or no cash consideration during the period. Diluted net income (loss) per share is computed by dividing the net income (loss) attributable to Clean Energy Fuels Corp. by the weighted-average number of common shares outstanding and common shares issuable for little or no cash consideration during the period and potentially dilutive securities outstanding during the period, and therefore reflects the dilution from common shares that may be issued upon exercise or conversion of these potentially dilutive securities, such as stock options, warrants, convertible notes and restricted stock units. The dilutive effect of stock awards and warrants is computed under the treasury stock method. The dilutive effect of convertible notes and restricted stock units is computed under the if-converted method. Potentially dilutive securities are excluded from the computations of diluted net income (loss) per share if their effect would be antidilutive.

The following table sets forth the computations of basic and diluted earnings (loss) per share for the three and six months ended June 30, 2020 and 2021 (in thousands except share and per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Net loss attributable to Clean Energy Fuels Corp.	$	(6,736)	$	(79,667)	$	(5,032)	$	(86,836)
Weighted-average common shares outstanding		200,670,137		207,047,221		202,831,346		203,043,580
Dilutive effect of potential common shares from restricted stock units and stock options		—		—		—		—
Weighted-average common shares outstanding - diluted		200,670,137		207,047,221		202,831,346		203,043,580
Basic and diluted loss per share	$	(0.03)	$	(0.38)	$	(0.02)	$	(0.43)

The following potentially dilutive securities have been excluded from the diluted net income (loss) per share calculations because their effect would have been antidilutive. Although these securities were antidilutive for these periods, they could be dilutive in future periods.

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Stock options		9,654,436		9,028,347		9,654,436		9,028,347
Convertible notes		1,311,031		—		2,237,794		—
Restricted stock units		1,007,929		1,241,306		1,007,929		1,241,306
Amazon warrant shares		—		58,767,714		—		58,767,714
Total		11,973,396		69,037,367		12,900,159		69,037,367

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Stock-Based Compensation

6 Months Ended

Jun. 30, 2021

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Note 14—Stock-Based Compensation

The following table summarizes the compensation expense and related income tax benefit related to the Company’s stock-based compensation arrangements recognized in the accompanying condensed consolidated statements of operations during the three and six months ended June 30, 2020 and 2021 (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Stock-based compensation expense, net of $0 tax in 2020 and 2021	$	760	$	3,419	$	1,814	$	6,786

As of June 30, 2021, there was $26.3 million of total unrecognized compensation costs related to unvested shares subject to outstanding stock options and restricted stock units, which is expected to be expensed over a weighted-average period of approximately 2.05 years.

Amazon Warrant

On April 16, 2021, the Company entered into a Project Addendum to Fuel Pricing Agreement (“Fuel Agreement”) with Amazon Logistics, Inc., a subsidiary of Amazon.com, Inc. (“Amazon”), and a Transaction Agreement with Amazon (the “Transaction Agreement”), pursuant to which, among other things, the Company issued to Amazon.com NV Investment Holdings LLC, a subsidiary of Amazon (“Amazon Holdings”), a warrant to purchase up to an aggregate of 53,141,755 shares (the “Warrant Shares”) of common stock, par value $0.0001 per share, of the Company (the “Common Stock”) at an exercise price of $13.49 per share, which was a 21.3% premium to the $11.12 closing price of the Common Stock on April 15, 2021.

The Warrant Shares vest in multiple tranches, the first of which for 13,283,445 Warrant Shares vested upon execution of the Fuel Agreement. Subsequent tranches will vest over time based on fuel purchases by Amazon and its affiliates, up to a total of $500.0 million, excluding any payments attributable to “Pass Through Costs,” which consist of all costs associated with the delivered cost of gas and applicable taxes determined by reference to the selling price of gallons or gas sold.

Under the Transaction Agreement, the Company was required to use commercially reasonable efforts to obtain the approval of its stockholders with respect to the issuance of Warrant Shares in excess of 50,595,531 shares of Common Stock, pursuant to The Nasdaq Stock Market LLC’s Listing Rule 5635(b) (the “Stockholder Approval”). On June 14, 2021, the Company obtained Stockholder Approval.

As a result of the issuance of additional shares of Common Stock under the ATM Programs (see Note 15) and in accordance with the terms of the warrant, on June 14, 2021, the number of shares of the Company’s Common Stock that may be purchased pursuant to the warrant, at an exercise price of $13.49 per share, increased by an aggregate of 5,625,959 shares (the “Additional Warrant Shares”). The Additional Warrant Shares vest in multiple tranches, the first of which for 1,406,490 Additional Warrant Shares vested on June 14, 2021. Subsequent tranches of the Additional Warrant Shares will

vest over time based on fuel purchases by Amazon and its affiliates, consistent with the vesting schedule for the Warrant Shares as described above. The right to purchase Warrant Shares and Additional Warrant Shares (the “Amazon Warrant”) that have vested expires April 16, 2031.

Amazon Holdings may not exercise the Amazon Warrant to the extent such exercise would cause Amazon Holdings to beneficially own more than 4.999% of the number of shares of Common Stock outstanding immediately after giving effect to such exercise (excluding any unvested portion of the Amazon Warrant) (the “Beneficial Ownership Limitation”). Amazon Holdings may, however, waive or modify the Beneficial Ownership Limitation by providing written notice to the Company sixty-one (61) days before such waiver or modification becomes effective (or immediately upon written notice to the Company to the extent the Company is subject to certain acquisition transactions pursuant to a tender or exchange offer).

Non-cash stock-based sales incentive contra-revenue charges (“Amazon Warrant Charges”) associated with the Amazon Warrant are recognized as the customer fuels and vesting conditions become probable of being achieved, based on the grant date fair value of the warrants. The fair values of the Amazon Warrant were determined as of the grant date in accordance with ASC 718, Compensation – Stock Compensation, using the Black-Scholes option pricing model and the following assumptions:

	April 16, 2021	June 14, 2021
Dividend yield	0.0%	0.0%
Expected volatility	66.46%	67.97
Risk-free interest rate	1.59%	1.49%
Expected term in years	10.0	9.8

The volatility amounts used were estimated based on the Company’s historical volatility of the Company’s stock over a period matching the assumed term of the warrants. The expected terms used were based on the term of the warrants at the date of issuance. The risk-free interest rates used were based on the U.S. Treasury yield curve for the expected term of the warrant at the date of issuance.

The following table summarizes the Amazon Warrant activity for the six months ended June 30, 2021:

	Warrant
	Shares
Outstanding and unvested as of December 31, 2020	—
Granted	58,767,714
Vested	(14,689,935)
Outstanding and unvested as of June 30, 2021	44,077,779

As a result of the immediate vesting of Warrant Shares and Additional Warrant Shares, the Company recognized Amazon Warrant Charges of $76.6 million and a customer incentive asset of $38.4 million representing Amazon Warrant Charges associated with future contractually required minimum fuel purchases which will be recognized as the fuel is purchased.

During the three and six months ended June 30, 2021, Amazon Warrant Charges in the condensed consolidated statements of operations were $78.1 million, which included $76.6 million from the immediate vesting and $1.5 million associated with fuel purchases. As of June 30, 2021, the Company had a customer incentive asset of $2.4 million and $35.4 million, classified in “Prepaid expenses and other current assets” and “Notes receivable and other long-term assets, net,” respectively, in the accompanying condensed consolidated balance sheets.

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Stockholders' Equity

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Stockholders' Equity

Note 15—Stockholders’ Equity

Authorized Shares

On June 14, 2021, the Company’s stockholders approved an increase in the number of shares of Common Stock the Company is authorized to issue from 304,000,000 to 454,000,000. As of June 30, 2021, the Company is authorized to issue 455,000,000 shares, of which 454,000,000 shares of capital stock are designated Common Stock and 1,000,000 shares are designated preferred stock.

At-The-Market Offerings

On May 10, 2021, the Company entered into an equity distribution agreement with Goldman Sachs & Co. LLC, as sales agent, to sell shares of the Company’s Common Stock having an aggregate offering price of up to $100.0 million in an at-the-market offering program (the “May ATM Program”). As of June 3, 2021, the Company sold 12,362,237 shares of Common Stock under the May ATM Program, which exhausted the May ATM Program. On June 7, 2021, the Company entered into a new equity distribution agreement with Goldman Sachs & Co. LLC, as sales agent, to sell additional shares of Common Stock having an aggregate offering price of up to $100.0 million in a new at-the-market offering program (the “June ATM Program” and, together with the May ATM Program, the “ATM Programs”). On June 8, 2021, the Company sold 10,473,946 shares of Common Stock under the June ATM Program which exhausted the June ATM Program.

During the three months ended June 30, 2021, the Company issued 22,836,183 shares of Common Stock under the ATM Programs for gross proceeds of $200.0 million, and incurred transaction costs of $6.5 million, including $6.0 million in commissions paid to Goldman Sachs & Co. LLC.

Share Repurchase Program

On March 12, 2020, the Company’s Board of Directors approved a share repurchase program of up to $30.0 million (exclusive of fees and commissions) of the Company’s outstanding common stock (the “Repurchase Program”). The Repurchase Program does not have an expiration date, and it may be suspended or discontinued at any time. As of June 30, 2021, the Company had utilized $14.5 million to repurchase 7,744,386 shares of common stock under the Repurchase Program. During the three and six months ended June 30, 2021, the Company did not repurchase any shares of its common stock. The Repurchase Program does not obligate the Company to acquire any specific number of shares. Repurchases under the Repurchase Program may be effected from time to time through open market purchases, privately negotiated transactions, structured or derivative transactions, including accelerated share repurchase transactions, or other methods of acquiring shares, in each case subject to market conditions, applicable securities laws and other relevant factors. Repurchases may also be made under Rule 10b5-1 plans.

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Income Taxes

6 Months Ended

Jun. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Note 16—Income Taxes

The provision for income taxes for interim periods is determined using an estimate of the Company’s annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter, the Company updates the estimate of the annual effective tax rate, and if the estimated tax rate changes, a cumulative adjustment is recorded.

The Company’s income tax expense was $0.1 million for each of the three months ended June 30, 2020 and 2021, and $0.2 million and $0.1 million for the six months ended June 30, 2020 and 2021, respectively. Tax expense for all periods consists of taxes due on the Company’s U.S. and foreign operations. The effective tax rates for the three and six months ended June 30, 2020 and 2021 are different from the federal statutory tax rate primarily due to losses for which no tax benefit has been recognized.

The Company increased its unrecognized tax benefits in the six months ended June 30, 2021 by $2.3 million. This increase is primarily attributable to the portion of AFTC revenue recognized in the period attributed to the federal fuel tax the Company collected from its customers and deductions attributed to the unvested Amazon Warrant. The net interest incurred was immaterial for the three and six months ended June 30, 2020 and 2021.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 17—Commitments and Contingencies

Environmental Matters

The Company is subject to federal, state, local and foreign environmental laws and regulations. The Company does not anticipate any expenditures to comply with such laws and regulations that would have a material effect on the Company’s consolidated financial position, results of operations or liquidity. The Company believes that its operations comply, in all material respects, with applicable federal, state, local and foreign environmental laws and regulations.

Litigation, Claims and Contingencies

The Company may become party to various legal actions that arise in the ordinary course of its business. The Company is also subject to audit by tax and other authorities for varying periods in various federal, state, local and foreign jurisdictions, and disputes may arise during the course of these audits. It is impossible to determine the ultimate liabilities that the Company may incur resulting from any of these lawsuits, claims, proceedings, audits, commitments, contingencies and related matters or the timing of these liabilities, if any. If these matters were to ultimately be resolved unfavorably, it is possible that such an outcome could have a material adverse effect upon the Company’s consolidated financial position, results of operations, or liquidity. The Company does not, however, anticipate such an outcome and believes the ultimate resolution of these matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations, or liquidity.

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Leases

6 Months Ended

Jun. 30, 2021

Leases

Leases

Note 18—Leases

Lessor Accounting

The Company leases fueling station equipment to customers pursuant to agreements that contain an option to extend and an end-of-term purchase option. Receivables from these leases are accounted for as finance leases, specifically sales-type leases, and are included in “Other receivables” and “Notes receivable and other long-term assets, net” in the accompanying condensed consolidated balance sheets.

The Company recognizes the net investment in the lease as the sum of the lease receivable and the unguaranteed residual value, both of which are measured at the present value using the interest rate implicit in the lease.

During each of the three months ended June 30, 2020 and 2021, the Company recognized $0.1 million in “Interest income” on its lease receivables. During each of the six months ended June 30, 2020 and 2021, the Company recognized $0.2 million in “Interest income” on its lease receivables.

The following schedule represents the Company’s maturities of lease receivables as of June 30, 2021 (in thousands):

Fiscal year:
2021	$	701
2022		1,182
2023		962
2024		962
2025		962
Thereafter		3,544
Total minimum lease payments		8,313
Less amount representing interest		(2,300)
Present value of lease receivables	$	6,013

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Alternative Fuels Excise Tax Credit

6 Months Ended

Jun. 30, 2021

Alternative Fuel Excise Tax Credit

Alternative Fuels Excise Tax Credit

Note 19—Alternative Fuel Excise Tax Credit

Under separate pieces of U.S. federal legislation, the Company has been eligible to receive the AFTC for its natural gas vehicle fuel sales made between October 1, 2006 and June 30, 2021. The AFTC is equal to $0.50 per gasoline gallon equivalent of CNG that the Company sold as vehicle fuel, and $0.50 per diesel gallon of LNG that the Company sold as vehicle fuel in 2020 and 2021. AFTC is currently available for vehicle fuel sales made through December 31, 2021 and may not be reinstated for vehicle fuel sales made after December 31, 2021.

Based on the service relationship with its customers, either the Company or its customers claim the credit. The Company records its AFTC, if any, as revenue in its condensed consolidated statements of operations because the credits are fully payable to the Company and do not offset income tax liabilities. As such, the credits are not deemed income tax credits under the accounting guidance applicable to income taxes.

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Related Party Transactions

6 Months Ended

Jun. 30, 2021

Related Party Transactions [Abstract]

Related Party Transactions

Note 20—Related Party Transactions

Total S.E.

During the three and six months ended June 30, 2020, the Company recognized revenue of $2.0 million and $2.6 million, respectively, related to RINs sold to Total and its affiliates in the ordinary course of business. During the three and six months ended June 30, 2021, the Company recognized revenue of $0.9 million and $1.6 million, respectively, related to RINs and LNG sold to Total and its affiliates in the ordinary course of business and settlements on commodity swap contracts (Note 6). As of December 31, 2020 and June 31, 2021, the Company had receivables from Total of $0.9 million and $0.5 million, respectively.

During the three and six months ended June 30, 2020, the Company paid Total $0.2 million and $0.4 million, respectively, for expenses incurred in the ordinary course of business. During the three and six months ended June 30, 2021, the Company paid Total $0.5 million and $1.0 million, respectively, for expenses incurred in the ordinary course of business, settlements on commodity swap contracts (Note 6), and the guaranty fee under the CSA (Note 12). As of December 31, 2020 and June 30, 2021, the amount due to Total was immaterial.

SAFE&CEC S.r.l.

During the three and six months ended June 30, 2020, the Company received $0.9 million and $1.0 million, respectively, from SAFE&CEC S.r.l. in the ordinary course of business. During the three and six months ended June 30, 2021, the Company received $0.0 million and $0.2 million, respectively, from SAFE&CEC S.r.l. in the ordinary course of business. As of December 31, 2020 and June 30, 2021, the Company had receivables from SAFE&CEC S.r.l. of $0.2 million and $0.0 million, respectively.

During the three and six months ended June 30, 2020, the Company paid SAFE&CEC S.r.l. $1.6 million and $2.8 million, respectively, for parts and equipment in the ordinary course of business. During the three and six months ended June 30, 2021, the Company paid SAFE&CEC S.r.l. $1.7 million and $2.5 million, respectively, for parts and equipment in the ordinary course of business. As of  December 31, 2020 and June 30, 2021, the Company had payables to SAFE&CEC S.r.l. of $0.9 million and $1.7 million, respectively.

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General (Policies)

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying interim unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries, and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s consolidated financial position as of June 30, 2021, results of operations, comprehensive loss, and stockholders’ equity for the three and six months ended June 30, 2020 and 2021, and cash flows for the six months ended June 30, 2020 and 2021. All intercompany accounts and transactions have been eliminated in consolidation. The results of operations for the three and six month periods ended June 30, 2020 and 2021 are not necessarily indicative of the results to be expected for the year ending December 31, 2021 or for any other interim period or any future year.

Certain information and disclosures normally included in the notes to consolidated financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”), but the resultant disclosures contained herein are in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as they apply to interim reporting. The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements as of and for the year ended December 31, 2020 that are included in the Company’s Annual Report on Form 10-K filed with the SEC on March 9, 2021.

Use of Estimates

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying condensed consolidated financial statements and these notes. Actual results could differ from those estimates and may result in material effects on the Company’s operating results and financial position. Significant estimates made in preparing the accompanying condensed consolidated financial statements include (but are not limited to) those related to revenue recognition, fair value measurements, goodwill and long-lived asset valuations and impairment assessments, income tax valuations, stock-based compensation expense and stock-based sales incentive charges.

Amazon Warrant

Amazon Warrant

The Amazon Warrant (defined in Note 14) is accounted for as an equity instrument and measured in accordance with Accounting Standards Codification (“ASC”) 718, Compensation – Stock Compensation. This instrument is classified in the condensed consolidated statements of operations in accordance with ASC 606, Revenue from Contracts with Customers. For awards granted to a customer, which are not in exchange for distinct goods or services, the fair value of the awards earned based on service or performance conditions is recorded as a reduction of the transaction price, in accordance with ASC 606. To determine the fair value of the Amazon Warrant in accordance with ASC 718, the Company used the Black-Scholes option pricing model which is based in part on assumptions that require management to use judgment. Based on the fair value of the award, the Company determines the amount of non-cash stock-based sales incentive charges on the customer’s pro-rata achievement of vesting conditions, which is recorded as a reduction of revenue in the condensed consolidated statements of operations. See Note 14 for additional information.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The new standard clarifies and simplifies the accounting for income taxes, including guidance related to intraperiod tax allocation, the recognition of deferred tax liabilities for outside basis differences, the methodology for calculating income taxes in an interim period, and the application of income tax guidance to franchise taxes that are partially based on income. The Company adopted this standard in the first quarter of 2021. Adoption of this ASU did not have a material impact on the Company’s condensed consolidated financial statements.

Revenue Recognition

Revenue Recognition Overview

The Company recognizes revenue when control of the promised goods or services is transferred to its customers, in an amount that reflects the consideration to which it expects to be entitled in exchange for the goods or services. To achieve that core principle, a five-step approach is applied: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue allocated to each performance obligation when the Company satisfies the performance obligation. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account for revenue recognition.

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Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The table below presents the Company’s revenue disaggregated by revenue source (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Volume-related (1) (2)	$	50,231	$	(10,829)	$	125,290	$	57,297
Station construction sales		5,277		6,071		10,800		10,606
AFTC (3)		4,366		5,238		9,790		9,720
Total revenue	$	59,874	$	480	$	145,880	$	77,623

(1) Includes changes in fair value of derivative instruments related to the Company’s commodity swap and customer fueling contracts associated with the Company’s Zero Now truck financing program. The amounts are classified as revenue because the Company’s commodity swap contracts are used to economically offset the risk associated with the diesel-to-natural gas price spread resulting from customer fueling contracts under the Company’s Zero Now truck financing program. See Note 6 for more information about these derivative instruments. For the three and six months ended June 30, 2020, aggregate changes in the fair value of commodity swaps and customer fueling contracts amounted to a loss of $1.5 million and a gain of $4.2 million, respectively. For the three and six months ended June 30, 2021, aggregate changes in the fair value of commodity swaps and customer fueling contracts amounted to a loss of $0.5 million and $2.5 million, respectively.

(2) Includes $78.1 million of non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant for the three and six months ended June 30, 2021. See Note 14 for more information.

(3) Represents the federal alternative fuel excise tax credit that we refer to as “AFTC,” which was extended for vehicle fuel sales made beginning January 1, 2021 through December 31, 2021.  See Note 19 for more information.

Summary of contract balances

As of December 31, 2020 and June 30, 2021, the Company’s contract balances were as follows (in thousands):

	December 31,		June 30,
	2020		2021
Accounts receivable, net	$	61,784	$	66,497
Contract assets - current	$	729	$	741
Contract assets - non-current		3,998		3,757
Contract assets - total	$	4,727	$	4,498
Contract liabilities - current	$	1,638	$	1,006
Contract liabilities - non-current		59		—
Contract liabilities - total	$	1,697	$	1,006

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Cash, Cash Equivalents, and Restricted Cash (Tables)

6 Months Ended

Jun. 30, 2021

Cash and Cash Equivalents [Abstract]

Schedule of cash and cash equivalents

Cash, cash equivalents and restricted cash as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Current assets:
Cash and cash equivalents	$	108,977	$	134,041
Total cash and cash equivalents	$	108,977	$	134,041
Long-term assets:
Restricted cash - standby letters of credit	$	4,000	$	—
Restricted cash - held as collateral		7,000		7,004
Total restricted cash	$	11,000	$	7,004
Total cash, cash equivalents and restricted cash	$	119,977	$	141,045

Schedule of components of restricted cash

Cash, cash equivalents and restricted cash as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Current assets:
Cash and cash equivalents	$	108,977	$	134,041
Total cash and cash equivalents	$	108,977	$	134,041
Long-term assets:
Restricted cash - standby letters of credit	$	4,000	$	—
Restricted cash - held as collateral		7,000		7,004
Total restricted cash	$	11,000	$	7,004
Total cash, cash equivalents and restricted cash	$	119,977	$	141,045

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Short-Term Investments (Tables)

6 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Summary of short-term investments

Short-term investments as of December 31, 2020 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Gain (Loss)		Fair Value
Municipal bonds and notes	$	28,998	$	—	$	28,998
Certificates of deposit		530		—		530
Total short-term investments	$	29,528	$	—	$	29,528

Short-term investments as of June 30, 2021 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Loss		Fair Value
Municipal bonds and notes	$	2,027	$	(1)	$	2,026
Zero coupon bonds		117,654		(2)		117,652
Certificates of deposit		530		—		530
Total short-term investments	$	120,211	$	(3)	$	120,208

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Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of commodity derivative activity

Derivatives and embedded derivatives as of December 31, 2020 consisted of the following (in thousands):

	Gross Amounts		Gross Amounts		Net Amount
	Recognized		Offset		Presented
Assets:
Commodity swaps:
Current portion of derivative assets, related party	$	1,591	$	—	$	1,591
Long-term portion of derivative assets, related party		4,057		—		4,057
Fueling agreements:
Prepaid expenses and other current assets		249		—		249
Notes receivable and other long-term assets, net		542		—		542
Total derivative assets	$	6,439	$	—	$	6,439
Liabilities:
Fueling agreements:
Accrued liabilities	$	283	$	—	$	283
Other long-term liabilities		273		—		273
Total derivative liabilities	$	556	$	—	$	556

Derivatives and embedded derivatives as of June 30, 2021 consisted of the following (in thousands):

	Gross Amounts		Gross Amounts		Net Amount
	Recognized		Offset		Presented
Assets:
Commodity swaps:
Long-term portion of derivative assets, related party	$	263	$	(263)	$	—
Fueling agreements:
Prepaid expenses and other current assets		1,399		—		1,399
Notes receivable and other long-term assets, net		3,670		—		3,670
Total derivative assets	$	5,332	$	(263)	$	5,069
Liabilities:
Commodity swaps:
Current portion of derivative liabilities, related party	$	709	$	—	$	709
Long-term portion of derivative liabilities, related party		1,247		(263)		984
Total derivative liabilities	$	1,956	$	(263)	$	1,693

Schedule of weighted-average price of open commodity swap contract

The following table reflects the weighted-average price of open commodity swap contracts as of December 31, 2020 and June 30, 2021, by year with associated volumes:

	December 31, 2020			June 30, 2021
	Volumes	Weighted-Average Price per		Volumes	Weighted-Average Price per
Year	(Diesel Gallons)	Diesel Gallon		(Diesel Gallons)	Diesel Gallon
2021	5,000,000	$	3.18	2,500,000	$	3.18
2022	5,000,000	$	3.18	5,000,000	$	3.18
2023	5,000,000	$	3.18	5,000,000	$	3.18
2024	1,875,000	$	3.18	1,875,000	$	3.18

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of estimated fair value of outstanding commodity swap contracts and embedded derivatives

The Company estimated the fair value of its outstanding commodity swap contracts based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

The Company estimated the fair value of embedded derivatives in its fueling agreements under the Zero Now truck financing program based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

Schedule of information by level for assets and liabilities that are measured at fair value on a recurring basis

The following tables provide information by level for assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2020 and June 30, 2021 (in thousands):

	December 31, 2020		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities (1):
Municipal bonds and notes	$	28,998	$	—	$	28,998	$	—
Certificates of deposit (1)		530		—		530		—
Commodity swap contracts (2)		5,648		—		—		5,648
Embedded derivatives (3)		791		—		—		791
Liabilities:
Embedded derivatives (3)	$	556	$	—	$	—	$	556

	June 30, 2021		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities (1):
Municipal bonds and notes	$	2,026	$	—	$	2,026	$	—
Zero coupon bonds		117,652		—		117,652		—
Certificates of deposit (1)		530		—		530		—
Embedded derivatives (3)		5,069		—		—		5,069
Liabilities:
Commodity swap contracts (2)	$	1,693	$	—	$	—	$	1,693

(1) Included in "Short-term investments" in the accompanying condensed consolidated balance sheets. See Note 5 for more information.

(2) Included in "Derivative assets, related party" and "Long-term portion of derivative assets, related party" as of December 31, 2020, and "Derivative liabilities, related party" and "Long-term portion of derivative liabilities, related party" as of June 30, 2021 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.

(3) Included in "Prepaid expenses and other current assets," “Notes receivable and other long-term assets, net," “Accrued liabilities” and “Other long-term liabilities” as of December 31, 2020, and "Prepaid expenses and other current assets" and “Notes receivable and other long-term assets, net" as of June 30, 2021 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.

Schedule of reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis that used significant unobservable inputs (Level 3)

The following tables provide a reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis as shown in the tables above that used significant unobservable inputs (Level 3), as well as the change in unrealized gains or losses for the periods included in earnings (in thousands):

	Assets:		Assets:		Liabilities:		Liabilities:
	Commodity		Embedded		Commodity		Embedded		Liabilities:
	Swap Contracts		Derivatives		Swap Contracts		Derivatives		Warrants
Balance as of March 31, 2020	$	12,545	$	143	$	—	$	(3,308)	$	(445)
Settlements, net		(453)		—		—		—		—
Total gain (loss)		(2,349)		(49)		—		1,384		445
Balance as of June 30, 2020	$	9,743	$	94	$	—	$	(1,924)	$	—
Balance as of March 31, 2021	$	1,347	$	2,521	$	—	$	(30)	$	—
Settlements, net		—		—		310		—		—
Total gain (loss)		(1,347)		2,548		(2,003)		30		—
Balance as of June 30, 2021	$	—	$	5,069	$	(1,693)	$	—	$	—
Change in unrealized gain (loss) for the three months ended June 30, 2020 included in earnings	$	(2,802)	$	(49)	$	—	$	1,384	$	445
Change in unrealized gain (loss) for the three months ended June 30, 2021 included in earnings	$	(1,347)	$	2,548	$	(1,693)	$	30	$	—

	Assets:		Assets:		Liabilities:		Liabilities:
	Commodity		Embedded		Commodity		Embedded		Liabilities:
	Swap Contracts		Derivatives		Swap Contracts		Derivatives		Warrants
Balance as of December 31, 2019	$	3,270	$	723	$	(164)	$	(81)	$	(40)
Settlements, net		(477)		—		56		—		—
Total gain (loss)		6,950		(629)		108		(1,843)		40
Balance as of June 30, 2020	$	9,743	$	94	$	—	$	(1,924)	$	—
Balance as of December 31, 2020	$	5,648	$	791	$	—	$	(556)	$	—
Settlements, net		(225)		—		349		—		—
Total gain (loss)		(5,423)		4,278		(2,042)		556		—
Balance as of June 30, 2021	$	—	$	5,069	$	(1,693)	$	—	$	—
Change in unrealized gain (loss) for the six months ended June 30, 2020 included in earnings	$	6,473	$	(629)	$	164	$	(1,843)	$	40
Change in unrealized gain (loss) for the six months ended June 30, 2021 included in earnings	$	(5,648)	$	4,278	$	(1,693)	$	556	$	—

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Other Receivables (Tables)

6 Months Ended

Jun. 30, 2021

Receivables [Abstract]

Schedule of other receivables

Other receivables as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Loans to customers to finance vehicle purchases	$	394	$	402
Accrued customer billings		6,335		6,527
Fuel tax credits		10,556		5,335
Other		6,370		2,595
Total other receivables	$	23,655	$	14,859

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Inventory (Tables)

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Schedule of inventories

Inventory as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Raw materials and spare parts	$	28,100	$	27,968
Total inventory	$	28,100	$	27,968

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Land, Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Summary of land, property and equipment

Land, property and equipment, net as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Land	$	3,476	$	3,476
LNG liquefaction plants		94,633		94,633
Station equipment		344,839		346,594
Trailers		79,860		77,437
Other equipment		89,276		90,212
Construction in progress		73,272		76,212
		685,356		688,564
Less accumulated depreciation		(394,445)		(413,878)
Total land, property and equipment, net	$	290,911	$	274,686

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Accrued Liabilities (Tables)

6 Months Ended

Jun. 30, 2021

Payables and Accruals [Abstract]

Schedule of accrued liabilities

Accrued liabilities as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31,		June 30,
	2020		2021
Accrued alternative fuels incentives (1)	$	18,175	$	17,911
Accrued employee benefits		4,282		3,754
Accrued gas and equipment purchases		9,897		9,847
Accrued interest		512		411
Accrued property and other taxes		3,094		3,385
Accrued salaries and wages		7,646		4,197
Embedded derivatives		283		—
Other (2)		8,748		10,846
Total accrued liabilities	$	52,637	$	50,351

(1) Includes the amount of RINs, LCFS Credits and the amount of AFTC payable to third parties.

(2) No individual item in “Other” exceeds 5% of total current liabilities.

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Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of long-term debt

Debt obligations as of December 31, 2020 and June 30, 2021 consisted of the following (in thousands):

	December 31, 2020
			Unamortized Debt		Balance, Net of
	Principal Balance		Financing Costs		Financing Costs
bp Loan	$	50,000	$	—	$	50,000
NG Advantage debt		29,535		117		29,418
SG Facility		5,100		—		5,100
Other debt		1,162		—		1,162
Total debt		85,797		117		85,680
Less amounts due within one year		(3,631)		(39)		(3,592)
Total long-term debt	$	82,166	$	78	$	82,088

	June 30, 2021
			Unamortized Debt		Balance, Net of
	Principal Balance		Financing Costs		Financing Costs
NG Advantage debt	$	27,861	$	86	$	27,775
SG Facility		9,500		—		9,500
Other debt		983		—		983
Total debt		38,344		86		38,258
Less amounts due within one year		(8,718)		(29)		(8,689)
Total long-term debt	$	29,626	$	57	$	29,569

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Net Income (Loss) Per Share (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule of information required to compute basic and diluted net loss per share

The following table sets forth the computations of basic and diluted earnings (loss) per share for the three and six months ended June 30, 2020 and 2021 (in thousands except share and per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Net loss attributable to Clean Energy Fuels Corp.	$	(6,736)	$	(79,667)	$	(5,032)	$	(86,836)
Weighted-average common shares outstanding		200,670,137		207,047,221		202,831,346		203,043,580
Dilutive effect of potential common shares from restricted stock units and stock options		—		—		—		—
Weighted-average common shares outstanding - diluted		200,670,137		207,047,221		202,831,346		203,043,580
Basic and diluted loss per share	$	(0.03)	$	(0.38)	$	(0.02)	$	(0.43)

Schedule of potentially dilutive securities that have been excluded from the diluted net loss per share calculations because their effect would have been antidilutive

The following potentially dilutive securities have been excluded from the diluted net income (loss) per share calculations because their effect would have been antidilutive. Although these securities were antidilutive for these periods, they could be dilutive in future periods.

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Stock options		9,654,436		9,028,347		9,654,436		9,028,347
Convertible notes		1,311,031		—		2,237,794		—
Restricted stock units		1,007,929		1,241,306		1,007,929		1,241,306
Amazon warrant shares		—		58,767,714		—		58,767,714
Total		11,973,396		69,037,367		12,900,159		69,037,367

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Summary of compensation expense and related income tax benefit related to the stock-based compensation expense recognized

The following table summarizes the compensation expense and related income tax benefit related to the Company’s stock-based compensation arrangements recognized in the accompanying condensed consolidated statements of operations during the three and six months ended June 30, 2020 and 2021 (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2021		2020		2021
Stock-based compensation expense, net of $0 tax in 2020 and 2021	$	760	$	3,419	$	1,814	$	6,786

Schedule of fair value measurement of warrants

The Company estimated the fair value of its outstanding commodity swap contracts based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

The Company estimated the fair value of embedded derivatives in its fueling agreements under the Zero Now truck financing program based on the following inputs as of December 31, 2020 and June 30, 2021:

	December 31, 2020			June 30, 2021
Significant Unobservable Inputs	Input Range	Weighted Average		Input Range	Weighted Average
ULSD Gulf Coast Forward Curve	$1.47 - $1.54	$	1.50	$1.87 - $1.98	$	1.92
Historical Differential to PADD 3 Diesel	$0.81 - $1.58	$	0.99	$0.81 - $1.58	$	1.01
Historical Differential to PADD 5 Diesel	$1.66 - $2.58	$	2.01	$1.75 - $2.58	$	2.06

Schedule of warrant activity

	Warrant
	Shares
Outstanding and unvested as of December 31, 2020	—
Granted	58,767,714
Vested	(14,689,935)
Outstanding and unvested as of June 30, 2021	44,077,779

Amazon Warrant

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Schedule of fair value measurement of warrants

	April 16, 2021	June 14, 2021
Dividend yield	0.0%	0.0%
Expected volatility	66.46%	67.97
Risk-free interest rate	1.59%	1.49%
Expected term in years	10.0	9.8

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Leases (Tables)

6 Months Ended

Jun. 30, 2021

Leases

Schedule of maturities of lease receivables

The following schedule represents the Company’s maturities of lease receivables as of June 30, 2021 (in thousands):

Fiscal year:
2021	$	701
2022		1,182
2023		962
2024		962
2025		962
Thereafter		3,544
Total minimum lease payments		8,313
Less amount representing interest		(2,300)
Present value of lease receivables	$	6,013

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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from Contracts with Customers
Revenue	$ 480	$ 59,874	$ 77,623	$ 145,880
Contra revenue charge			78,053
Volume -Related
Revenue from Contracts with Customers
Revenue	(10,829)	50,231	57,297	125,290
Gain (Loss) changes in fair value	(500)	(1,500)	(2,500)	4,200
Station construction sales
Revenue from Contracts with Customers
Revenue	6,071	5,277	10,606	10,800
AFTC
Revenue from Contracts with Customers
Revenue	$ 5,238	$ 4,366	$ 9,720	$ 9,790

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Revenue from Contracts with Customers - Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2021 USD ($)
Remaining Performance Obligations
Revenue, remaining performance obligation, amount	$ 12.9
Minimum
Remaining Performance Obligations
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Maximum
Remaining Performance Obligations
Revenue, remaining performance obligation, expected timing of satisfaction, period	24 months

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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 66,497	$ 61,784
Contract Assets - Current	741	729
Contract Assets - Noncurrent	3,757	3,998
Contract Assets - Total	4,498	4,727
Contract Liabilities - Current	1,006	1,638
Contract Liabilities - Noncurrent		59
Contract Liabilities - Total	$ 1,006	$ 1,697

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Revenue from Contracts with Customers - Contract Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Contract with customer, liability, revenue recognized	$ 1.5	$ 4.2

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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - Total Joint Venture (Details) - USD ($) $ in Millions	Mar. 03, 2021	Jan. 02, 2019
Socit Gnrale | SG Facility
Business Acquisition [Line Items]
Maximum borrowing capacity (up to)		$ 100.0
ADG RNG Production Facilities | Socit Gnrale | SG Facility
Business Acquisition [Line Items]
Maximum borrowing capacity (up to)	$ 20.0
ADG RNG Production Facilities | Total JV
Business Acquisition [Line Items]
Investment commitment of equity in production projects	400.0
Investment commitment in joint venture	50.0
ADG RNG Production Facilities | Total JV | Total
Business Acquisition [Line Items]
Investment commitment in joint venture	$ 50.0

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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - bp Joint Venture (Details) - USD ($) $ in Thousands, shares in Millions			3 Months Ended		6 Months Ended
	Jun. 21, 2021	Apr. 13, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 18, 2020
Business Acquisition [Line Items]
Income (loss) from equity method investments			$ 121	$ (502)	$ (305)	$ (357)
BP Products North America | bp Loan
Business Acquisition [Line Items]
Debt issuance amount							$ 50,000
ADG RNG Production Facilities | bpJV
Business Acquisition [Line Items]
Investment commitment in joint venture	$ 50,200	$ 30,000
Additional commitment in joint venture		20,000
Initial contribution commitment		$ 30,000
Income (loss) from equity method investments			(100)		(100)
Equity Method Investments			$ 50,000		$ 50,000
ADG RNG Production Facilities | bpJV | Class A Units
Business Acquisition [Line Items]
Number of units received		30.0
Payments to acquire units in joint venture	20,000
Priority Return to acquire additional units	$ 200
ADG RNG Production Facilities | bpJV | bp
Business Acquisition [Line Items]
Investment commitment in joint venture		$ 50,000
Ownership interest			50.00%		50.00%
ADG RNG Production Facilities | bpJV | bp | Class A Units
Business Acquisition [Line Items]
Number of units received		30.0
ADG RNG Production Facilities | bpJV | bp | Class B Units
Business Acquisition [Line Items]
Number of units received		20.0

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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - SAFE&CEC S.r.l. (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 29, 2017
Acquisition and Divestitures
Income (loss) from equity method investments	$ 121	$ (502)	$ (305)	$ (357)
SAFE&CEC S.r.l.
Acquisition and Divestitures
Ownership interest						49.00%
Income (loss) from equity method investments	500	$ (500)	100	$ (400)
Investment balance	$ 24,500		$ 24,500		$ 24,700
SAFE&CEC S.r.l. | Landi Renzo S.p.A.
Acquisition and Divestitures
Ownership interest						51.00%

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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - NG Advantage (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Oct. 14, 2014
Acquisition and Divestitures
Outstanding balance	$ 38,258		$ 38,258		$ 85,680
Loss from noncontrolling interest	282	$ 301	560	$ 1,106
NG Advantage
Acquisition and Divestitures
Loss from noncontrolling interest	300	$ 300	600	$ 1,100
Noncontrolling interest, fair value	$ 8,800		$ 8,800		$ 9,300
NG Advantage | Common unit purchase agreement
Acquisition and Divestitures
Ownership interest acquired						53.30%
Ownership interest	93.30%		93.30%

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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Restricted Cash
Cash and cash equivalents	$ 134,041	$ 108,977
Total cash and cash equivalents	134,041	108,977
Total restricted cash	7,004	11,000
Total cash, cash equivalents and restricted cash	141,045	119,977	$ 83,171	$ 53,222
Amount in excess of FDIC and CDIC limits	132,700	107,600
Standby letters of credit
Restricted Cash
Total restricted cash		4,000
Held as collateral
Restricted Cash
Total restricted cash	$ 7,004	$ 7,000

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Short-Term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 120,211	$ 29,528
Gross Unrealized Losses	(3)
Estimated Fair Value	120,208	29,528
Municipal bonds and notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,027	28,998
Gross Unrealized Losses	(1)
Estimated Fair Value	2,026	28,998
Zero coupon bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	117,654
Gross Unrealized Losses	(2)
Estimated Fair Value	117,652
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	530	530
Estimated Fair Value	$ 530	$ 530

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Derivative Instruments and Hedging Activities - Narrative (Details) - Not Designated as Hedging Instrument - Commodity swaps gal in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Oct. 31, 2018 contract gal	Jun. 30, 2021 $ / gal gal	Dec. 31, 2020 $ / gal gal
Derivative [Line Items]
Derivative asset, number of instruments held | contract	2
Volumes (Diesel Gallons) | gal	5.0	14.4	16.9
Weighted -average price per diesel gallon (in usd per gallon) | $ / gal		3.18	3.18

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Derivative Instruments and Hedging Activities - Summary of Commodity Derivative Activity (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative Assets
Gross Amounts Recognized	$ 5,332	$ 6,439
Gross Amounts Offset	(263)
Net Amount Presented	5,069	6,439
Derivative Liability
Gross Amounts Recognized	1,956	556
Gross Amounts Offset	(263)
Net Amount Presented	1,693	556
Current portion of derivative assets, related party | Commodity swaps
Derivative Assets
Gross Amounts Recognized		1,591
Net Amount Presented		1,591
Current portion of derivative liabilities, related party | Commodity swaps
Derivative Liability
Gross Amounts Recognized	709
Net Amount Presented	709
Long-term portion of derivative assets, related party | Commodity swaps
Derivative Assets
Gross Amounts Recognized	263	4,057
Gross Amounts Offset	(263)
Net Amount Presented		4,057
Long-term portion of derivative liabilities, related party | Commodity swaps
Derivative Liability
Gross Amounts Recognized	1,247
Gross Amounts Offset	(263)
Net Amount Presented	984
Prepaid expenses and other current assets | Fueling agreements
Derivative Assets
Gross Amounts Recognized	1,399	249
Net Amount Presented	1,399	249
Notes receivable and other long-term assets, net | Fueling agreements
Derivative Assets
Gross Amounts Recognized	3,670	542
Net Amount Presented	$ 3,670	542
Accrued liabilities | Fueling agreements
Derivative Liability
Gross Amounts Recognized		283
Net Amount Presented		283
Other long-term liabilities | Fueling agreements
Derivative Liability
Gross Amounts Recognized		273
Net Amount Presented		$ 273

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Derivative Instruments and Hedging Activities - Schedule of Weighted-Average Price of Open Commodity Wwap Contracts (Details) - Not Designated as Hedging Instrument	6 Months Ended	12 Months Ended
	Jun. 30, 2021 $ / gal gal	Dec. 31, 2020 $ / gal gal
Commodity Swap 2021
Derivative [Line Items]
Volumes (Diesel Gallons) | gal	2,500,000	5,000,000
Weighted -Average Price per Diesel Gallon (in usd per gallon) | $ / gal	3.18	3.18
Commodity Swap 2022
Derivative [Line Items]
Volumes (Diesel Gallons) | gal	5,000,000	5,000,000
Weighted -Average Price per Diesel Gallon (in usd per gallon) | $ / gal	3.18	3.18
Commodity Swap 2023
Derivative [Line Items]
Volumes (Diesel Gallons) | gal	5,000,000	5,000,000
Weighted -Average Price per Diesel Gallon (in usd per gallon) | $ / gal	3.18	3.18
Commodity Swap 2024
Derivative [Line Items]
Volumes (Diesel Gallons) | gal	1,875,000	1,875,000
Weighted -Average Price per Diesel Gallon (in usd per gallon) | $ / gal	3.18	3.18

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Fair Value Measurements - Commodity Swap Contracts (Details) - Not Designated as Hedging Instrument - Valuation Technique, Discounted Cash Flow - Level 3	Jun. 30, 2021	Dec. 31, 2020
Commodity swaps | Minimum | ULSD Gulf Coast Forward Curve
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.87	1.47
Commodity swaps | Minimum | Historical Differential to PADD 3 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.81	0.81
Commodity swaps | Minimum | Historical Differential to PADD 5 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.75	1.66
Commodity swaps | Maximum | ULSD Gulf Coast Forward Curve
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.98	1.54
Commodity swaps | Maximum | Historical Differential to PADD 3 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.58	1.58
Commodity swaps | Maximum | Historical Differential to PADD 5 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	2.58	2.58
Commodity swaps | Weighted Average | ULSD Gulf Coast Forward Curve
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.92	1.50
Commodity swaps | Weighted Average | Historical Differential to PADD 3 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.01	0.99
Commodity swaps | Weighted Average | Historical Differential to PADD 5 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	2.06	2.01
Fueling agreements | Minimum | ULSD Gulf Coast Forward Curve
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.87	1.47
Fueling agreements | Minimum | Historical Differential to PADD 3 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.81	0.81
Fueling agreements | Minimum | Historical Differential to PADD 5 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.75	1.66
Fueling agreements | Maximum | ULSD Gulf Coast Forward Curve
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.98	1.54
Fueling agreements | Maximum | Historical Differential to PADD 3 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.58	1.58
Fueling agreements | Maximum | Historical Differential to PADD 5 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	2.58	2.58
Fueling agreements | Weighted Average | ULSD Gulf Coast Forward Curve
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.92	1.50
Fueling agreements | Weighted Average | Historical Differential to PADD 3 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	1.01	0.99
Fueling agreements | Weighted Average | Historical Differential to PADD 5 Diesel
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	2.06	2.01

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Fair Value Measurements - Transfers (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Asset transferred from level 1 to 2	$ 0	$ 0
Asset transferred from level 2 to 1	0	0
Asset transferred level 3 net	0	0
Liabilities transferred from level 1 to 2	0	0
Liabilities transferred from level 2 to 1	0	0
Liabilities transferred level 3 net	$ 0	$ 0

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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Available-for-sale securities	$ 120,208	$ 29,528
Short-term investments	120,208	29,528
Municipal bonds and notes
Assets:
Available-for-sale securities	2,026	28,998
Zero coupon bonds
Assets:
Available-for-sale securities	117,652
Certificates of deposit
Assets:
Available-for-sale securities	530	530
Fair value measured on recurring basis | Municipal bonds and notes
Assets:
Available-for-sale securities	2,026	28,998
Fair value measured on recurring basis | Zero coupon bonds
Assets:
Available-for-sale securities	117,652
Fair value measured on recurring basis | Certificates of deposit
Assets:
Short-term investments	530	530
Fair value measured on recurring basis | Commodity swap contracts
Assets:
Derivative assets		5,648
Liabilities:
Derivative liabilities	1,693
Fair value measured on recurring basis | Embedded derivatives
Assets:
Derivative assets	5,069	791
Liabilities:
Derivative liabilities		556
Fair value measured on recurring basis | Level 2 | Municipal bonds and notes
Assets:
Available-for-sale securities	2,026	28,998
Fair value measured on recurring basis | Level 2 | Zero coupon bonds
Assets:
Available-for-sale securities	117,652
Fair value measured on recurring basis | Level 2 | Certificates of deposit
Assets:
Short-term investments	530	530
Fair value measured on recurring basis | Level 3 | Commodity swap contracts
Assets:
Derivative assets		5,648
Liabilities:
Derivative liabilities	1,693
Fair value measured on recurring basis | Level 3 | Embedded derivatives
Assets:
Derivative assets	$ 5,069	791
Liabilities:
Derivative liabilities		$ 556

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Fair Value Measurements - Fair Value Recognition - Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income [Extensible List]	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax
Commodity swap contracts
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3)
Beginning balance	$ 1,347	$ 12,545	$ 5,648	$ 3,270
Settlements, net		(453)	(225)	(477)
Total gain (loss)	(1,347)	(2,349)	(5,423)	6,950
Ending balance		9,743		9,743
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(1,347)	(2,802)	(5,648)	6,473
Embedded derivatives
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3)
Beginning balance	2,521	143	791	723
Total gain (loss)	2,548	(49)	4,278	(629)
Ending balance	5,069	94	5,069	94
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 2,548	$ (49)	$ 4,278	$ (629)

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Fair Value Measurements - Fair Value Recognition - Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of the beginning and ending balances of liabilities measured at fair value using significant unobservable inputs (Level 3)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income [Extensible List]	Unrealized Gain (Loss) on Commodity Contracts	Unrealized Gain (Loss) on Commodity Contracts	Unrealized Gain (Loss) on Commodity Contracts	Unrealized Gain (Loss) on Commodity Contracts
Commodity swap contracts
Reconciliation of the beginning and ending balances of liabilities measured at fair value using significant unobservable inputs (Level 3)
Beginning Balance				$ (164)
Settlements, net	$ 310		$ 349	56
Total gain (loss)	(2,003)		(2,042)	108
Ending Balance	(1,693)		(1,693)
Change in unrealized gain (loss) included in earnings	(1,693)		(1,693)	164
Embedded derivatives
Reconciliation of the beginning and ending balances of liabilities measured at fair value using significant unobservable inputs (Level 3)
Beginning Balance	(30)	$ (3,308)	(556)	(81)
Total gain (loss)	30	1,384	556	(1,843)
Ending Balance		(1,924)		(1,924)
Change in unrealized gain (loss) included in earnings	$ 30	1,384	$ 556	(1,843)
Warrants
Reconciliation of the beginning and ending balances of liabilities measured at fair value using significant unobservable inputs (Level 3)
Beginning Balance		(445)		(40)
Total gain (loss)		445		40
Change in unrealized gain (loss) included in earnings		$ 445		$ 40

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Other Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Receivables
Other receivables	$ 14,859	$ 23,655
Loans to customers to finance vehicle purchases
Other Receivables
Other receivables	402	394
Accrued customer billings
Other Receivables
Other receivables	6,527	6,335
Fuel tax credits
Other Receivables
Other receivables	5,335	10,556
Other
Other Receivables
Other receivables	$ 2,595	$ 6,370

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Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials and spare parts	$ 27,968	$ 28,100
Total inventory	$ 27,968	$ 28,100

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Land, Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Land, Property and Equipment
Land, property and equipment, gross	$ 688,564		$ 688,564		$ 685,356
Less accumulated depreciation	(413,878)		(413,878)		(394,445)
Total land, property and equipment, net	274,686		274,686		290,911
Capitalized software costs, net	33,200		33,200		32,300
Accumulated amortization on the capitalized software costs	29,700		29,700		28,800
Amortization expense related to the capitalized software costs	400	$ 600	900	$ 1,300
Amount included in accounts payable balances			900	$ 1,500
Land
Land, Property and Equipment
Land, property and equipment, gross	3,476		3,476		3,476
LNG liquefaction plants
Land, Property and Equipment
Land, property and equipment, gross	94,633		94,633		94,633
Station equipment
Land, Property and Equipment
Land, property and equipment, gross	346,594		346,594		344,839
Trailers
Land, Property and Equipment
Land, property and equipment, gross	77,437		77,437		79,860
Other equipment
Land, Property and Equipment
Land, property and equipment, gross	90,212		90,212		89,276
Construction in progress
Land, Property and Equipment
Land, property and equipment, gross	$ 76,212		$ 76,212		$ 73,272

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Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued alternative fuels incentives	$ 17,911	$ 18,175
Accrued employee benefits	3,754	4,282
Accrued gas and equipment purchases	9,847	9,897
Accrued interest	411	512
Accrued property and other taxes	3,385	3,094
Accrued salaries and wages	4,197	7,646
Embedded derivatives		283
Other	10,846	8,748
Total accrued liabilities	$ 50,351	$ 52,637

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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Principal Balances
Total debt	$ 38,344	$ 85,797
Less amounts due within one year	(8,718)	(3,631)
Total long-term debt	29,626	82,166
Unamortized Debt Financing Costs
Total debt	86	117
Less amounts due within one year	(29)	(39)
Total long-term debt	57	78
Balance, Net of Financing Costs
Total debt	38,258	85,680
Less amounts due within one year	(8,689)	(3,592)
Total long-term debt	29,569	82,088
bp Loan
Principal Balances
Total debt		50,000
Balance, Net of Financing Costs
Total debt		50,000
NG Advantage debt
Principal Balances
Total debt	27,861	29,535
Unamortized Debt Financing Costs
Total debt	86	117
Balance, Net of Financing Costs
Total debt	27,775	29,418
SG Facility
Principal Balances
Total debt	9,500	5,100
Balance, Net of Financing Costs
Total debt	9,500	5,100
Other debt
Principal Balances
Total debt	983	1,162
Balance, Net of Financing Costs
Total debt	$ 983	$ 1,162

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Debt - SG Credit and TOTAL Credit Support Agreement (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 02, 2019	Jun. 30, 2021	Mar. 12, 2021	Mar. 03, 2021	Dec. 31, 2020
Long-term debt [Line Items]
Outstanding amount		$ 38,344			$ 85,797
Proceeds from revolving line of credit		1,150
SG Facility | Socit Gnrale
Long-term debt [Line Items]
Maximum borrowing capacity (up to)	$ 100,000
Commitment fee percentage	0.39%
Quarterly principal payments		2,500
Covenant for debt default	$ 20,000
Outstanding amount		$ 9,500
SG Facility | Socit Gnrale | London Interbank Offered Rate (LIBOR)
Long-term debt [Line Items]
Basis spread on variable rate	1.30%
SG Facility | Socit Gnrale | Station Build Costs
Long-term debt [Line Items]
Maximum borrowing capacity (up to)			$ 45,000
SG Facility | Socit Gnrale | ADG RNG Production Facilities
Long-term debt [Line Items]
Maximum borrowing capacity (up to)				$ 20,000
SG Facility | Total Holdings USA Inc.
Long-term debt [Line Items]
Maximum borrowing capacity (up to)	$ 100,000
Interest rate per quarter	2.50%
Covenant for debt default	$ 20,000
SG Facility | Total Holdings USA Inc. | London Interbank Offered Rate (LIBOR)
Long-term debt [Line Items]
Basis spread on variable rate	1.00%

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Debt - NG Advantage Debt and Financing Lease Obligations (Details) $ in Thousands					6 Months Ended
	Dec. 10, 2020 USD ($)	Dec. 20, 2018 USD ($)	Mar. 01, 2018 USD ($) installment	Dec. 18, 2017 USD ($) installment	Jun. 30, 2021 USD ($)	Nov. 30, 2016 USD ($) installment
Long-term debt [Line Items]
Loss on extinguishment of debt					$ 25
Proceeds from revolving line of credit					1,150
Repayments of borrowing under revolving line of credit					650
Compression Station
Long-term debt [Line Items]
Purchase price		$ 7,000
Sale leaseback transaction, term		5 years
Annual rate (as a percent)		12.00%
Monthly rental payments		$ 100
BoA | BoA MLA
Long-term debt [Line Items]
Interest rate				4.86%
Proceeds from sale of equipment in sale-leaseback agreement				$ 2,100
Sale leaseback transaction, term				5 years
Number of equal monthly installments | installment				60
First National | First National MLA
Long-term debt [Line Items]
Interest rate			9.28%
Proceeds from sale of equipment in sale-leaseback agreement			$ 6,300
Sale leaseback transaction, term			6 years
Number of equal monthly installments | installment			72
Loan and Security Agreement [Member] | 5.17% Term Loan | Wintrust Commercial Finance
Long-term debt [Line Items]
Debt issuance amount						$ 4,700
Number of monthly installments | installment						72
Interest rate						5.17%
NG Advantage debt | Long-term portion of restricted cash | Berkshire Bank
Long-term debt [Line Items]
Loan pledged as collateral	$ 7,000
NG Advantage debt | 5% maturing on January 1, 2026 | Berkshire Bank
Long-term debt [Line Items]
Debt issuance amount	$ 14,500
Interest rate	5.00%
Period during which the debt instrument principal balance is required to be paid following its issuance	5 years
NG Advantage debt | Revolving line of credit | Berkshire Bank
Long-term debt [Line Items]
Maximum borrowing capacity (up to)	$ 1,000
Outstanding line of credit					$ 500
Interest rate during period (as a percent)	3.00%
Interest rate (as a percent)					3.50%
NG Advantage debt | Revolving line of credit | Berkshire Bank | Prime Rate
Long-term debt [Line Items]
Basis spread on variable rate	0.25%				0.25%
Interest rate (as a percent)					3.25%

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Debt - BP Loan and Plain Credit Facility (Details) - USD ($) $ in Millions	Dec. 18, 2020	Jun. 30, 2021	May 01, 2021
bp Loan | BP Products North America
Debt Instrument [Line Items]
Debt issuance amount	$ 50.0
bp Loan | BP Products North America | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	4.33%
Revolving line of credit | Plains Credit Facility | Plains
Debt Instrument [Line Items]
Maximum borrowing capacity (up to)			$ 20.0
Outstanding line of credit		$ 0.0
Revolving line of credit | Plains Credit Facility | Minimum | Plains
Debt Instrument [Line Items]
Interest rate (as a percent)			3.25%

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Debt - Other Debt (Details) - Other debt	Jun. 30, 2021	Dec. 31, 2020
Long-term debt [Line Items]
Weighted average interest rate	4.37%	4.38%
Maximum
Long-term debt [Line Items]
Interest rate	4.75%

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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income (loss) attributable to Clean Energy Fuels Corp.	$ (79,667)	$ (6,736)	$ (86,836)	$ (5,032)
Weighted average common shares outstanding	207,047,221	200,670,137	203,043,580	202,831,346
Weighted average common shares outstanding - diluted	207,047,221	200,670,137	203,043,580	202,831,346
Basic income (loss) per share (in dollars per share)	$ (0.38)	$ (0.03)	$ (0.43)	$ (0.02)
Diluted income (loss) per share (in dollars per share)	$ (0.38)	$ (0.03)	$ (0.43)	$ (0.02)

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Net Income (Loss) Per Share - Anti-dilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Loss Per Share
Anti-dilutive securities (in shares)	69,037,367	11,973,396	69,037,367	12,900,159
Stock options
Net Loss Per Share
Anti-dilutive securities (in shares)	9,028,347	9,654,436	9,028,347	9,654,436
Convertibles notes
Net Loss Per Share
Anti-dilutive securities (in shares)		1,311,031		2,237,794
Restricted stock units
Net Loss Per Share
Anti-dilutive securities (in shares)	1,241,306	1,007,929	1,241,306	1,007,929
Warrants
Net Loss Per Share
Anti-dilutive securities (in shares)	58,767,714		58,767,714

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Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense, net of $0 tax in 2020 and 2021	$ 3,419	$ 760	$ 6,786	$ 1,814
Stock-based compensation expense, tax	0	$ 0	0	$ 0
Unrecognized compensation cost	$ 26,300		$ 26,300
Unrecognized compensation cost, weighted-average period			2 years 18 days

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Stock-Based Compensation - Amazon Warrant (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	Jun. 14, 2021	Apr. 16, 2021	Jun. 30, 2021	Jun. 30, 2021	Apr. 15, 2021	Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)			$ 0.0001	$ 0.0001		$ 0.0001
Common stock price (in dollars per share)					$ 11.12
Contra revenue charge				$ 78,053
Transaction Agreement
Subsidiary, Sale of Stock [Line Items]
Aggregate number of warrant shares (in shares)	5,625,959	53,141,755
Common stock, par value (in dollars per share)		$ 0.0001
Exercise price of the warrant (in dollars per share)	$ 13.49	$ 13.49
Exercise price premium (as a percent)		21.30%
Aggregate number of warrant shares that may require stockholder approval (in shares)		50,595,531
Notification period to waive or modify Beneficial Ownership Limitation		61 days
Contra revenue charge		$ 76,600	$ 78,100	78,100
Customer incentive assets		$ 38,400
Transaction Agreement | Prepaid expenses and other current assets
Subsidiary, Sale of Stock [Line Items]
Customer incentive assets			2,400	2,400
Transaction Agreement | Notes receivable and other long term assets
Subsidiary, Sale of Stock [Line Items]
Customer incentive assets			35,400	35,400
Transaction Agreement | Maximum
Subsidiary, Sale of Stock [Line Items]
Percentage of common stock outstanding owned (as a percent)		4.999%
Transaction Agreement | Tranche One
Subsidiary, Sale of Stock [Line Items]
Number of warrants vested (in shares)	1,406,490	13,283,445
Total discretionary fuel purchases		$ 500,000
Contra revenue charge			76,600	76,600
Transaction Agreement | Tranche Two
Subsidiary, Sale of Stock [Line Items]
Contra revenue charge			$ 1,500	$ 1,500

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Stock-Based Compensation - Fair Value of Warrant (Details) - Amazon Warrant - Black-Scholes option pricing model	Jun. 14, 2021	Apr. 16, 2021
Dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant	0.000	0.000
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant	0.6797	0.6646
Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant	0.0149	0.0159
Expected term in years
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant	0.098	0.100

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Stock-Based Compensation - Warrant Activity (Details) - Amazon Warrant	6 Months Ended
	Jun. 30, 2021 USD ($) shares
Class of Warrant or Right [Line Items]
Granted	58,767,714
Vested	(14,689,935)
Outstanding and unvested as of June 30, 2021 | $	$ 44,077,779

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Stockholders' Equity - Authorized Shares (Details) - shares	Jun. 30, 2021	Jun. 14, 2021	Jun. 13, 2021	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Authorized shares (in shares)	455,000,000	454,000,000	304,000,000
Common stock, authorized (in shares)	454,000,000			304,000,000
Preferred stock, authorized (in shares)	1,000,000			1,000,000

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Stockholders' Equity - At the Market Offering (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	Jun. 08, 2021	Jun. 03, 2021	Jun. 30, 2021	Jun. 30, 2021	Jun. 07, 2021	May 10, 2021	Dec. 31, 2020
ATM Program Activity
Common stock, par value (in dollars per share)			$ 0.0001	$ 0.0001			$ 0.0001
Fees and issuance costs				$ 6,534
At The Market Offering
ATM Program Activity
Fees and issuance costs			$ 6,500
Goldman Sachs & Co. LLC | At The Market Offering
ATM Program Activity
Aggregate offering price					$ 100,000	$ 100,000
Gross proceeds			$ 200,000
Shares issued (in shares)	10,473,946	12,362,237	22,836,183
Fees and issuance costs			$ 6,000

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Stockholders' Equity - Share Repurchase Program (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	16 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2021	Mar. 12, 2020
Equity [Abstract]
Approved share repurchase program						$ 30,000
Cost to repurchase common stock		$ 6,406	$ 4,244		$ 14,500
Repurchase of common stock (in shares)	0			0	7,744,386

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 56	$ 78	$ 139	$ 156
Unrecognized tax benefits, increase from portion of AFTC revenue offset by the fuel tax			$ 2,300

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Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases
Sales-type lease, interest income	$ 0.1	$ 0.1	$ 0.2	$ 0.2

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Leases - Maturities of Lease Receivables (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Fiscal year:
2021	$ 701
2022	1,182
2023	962
2024	962
2025	962
Thereafter	3,544
Total minimum lease payments	8,313
Less amount representing interest	(2,300)
Present value of lease receivables	$ 6,013

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Alternative Fuel Excise Tax Credit (Details) - $ / gal	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Alternative Fuel Excise Tax Credit
Federal alternative fuels tax credit - CNG (in dollars per gasoline gallon equivalent)	0.50	0.50
Federal alternative fuels tax credit - LNG (in dollars per liquid gallon)	0.50	0.50

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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
TOTAL S.E.
Related Party Transaction [Line Items]
Proceeds from related party	$ 0.9	$ 2.0	$ 1.6	$ 2.6
Receivables from related party	0.5		0.5		$ 0.9
Related party expense	0.5	0.2	1.0	0.4
SAFE&CEC S.r.l.
Related Party Transaction [Line Items]
Proceeds from related party	0.0	0.9	0.2	1.0
Receivables from related party	0.0		0.0		0.2
Related party expense	1.7	$ 1.6	2.5	$ 2.8
Payable to related parties	$ 1.7		$ 1.7		$ 0.9