10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

☑ 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

Commission file number 001-36103

TECOGEN INC. (OTCQX:TGEN)

(Exact name of Registrant as specified in its charter)

Delaware	04-3536131
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)

45 First Avenue

Waltham, Massachusetts 02451

(Address of Principal Executive Offices and Zip Code)

(781) 466-6402

(Registrant's telephone number, including area code)

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 ý   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 ý   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 the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company”, and "emerging growth company" in Rule 12b-2 of the Exchange Act:

Large accelerated filer o	Accelerated filer o
Non-accelerated filer ☒	Emerging Growth company ☐
Smaller reporting 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 August 3, 2021, 24,850,261 shares of common stock, $.001 par value per share, of the registrant were issued and outstanding.

TECOGEN INC.

QUARTERLY REPORT ON FORM 10-Q

FOR THE PERIOD ENDED JUNE 30, 2021

TABLE OF CONTENTS

 

PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets (Unaudited)
	June 30, 2021 and December 31, 2020	1
	Condensed Consolidated Statements of Operations (Unaudited)
	Three Months Ended June 30, 2021 and 2020	2
	Condensed Consolidated Statements of Operations (Unaudited)
	Six Months Ended June 30, 2021 and 2020	3
	Condensed Consolidated Statements of Stockholders' Equity (Unaudited)
	Three and Six Months Ended June 30, 2021 and 2020	4
	Condensed Consolidated Statements of Cash Flows (Unaudited)
	Six Months Ended June 30, 2021 and 2020	5
	Notes to Unaudited Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	18
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	30
Item 4.	Controls and Procedures	31
PART II - OTHER INFORMATION
Item 1.	Legal Proceedings	31
Item 1A.	Risk Factors	31
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	31
Item 3.	Defaults in Senior Securities	31
Item 4.	Mine Safety Disclosures	31
Item 5.	Other Information	32
Item 6.	Exhibits	33
Signatures	Signature Page	34

References in this Form 10-Q to "we", "us", "our"', the "Company" and "Tecogen" refers to Tecogen Inc. and its consolidated subsidiaries, unless otherwise noted.

TECOGEN INC.

PART I - FINANCIAL INFORMATION

Item 1 - Financial Statements

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

	June 30, 2021		December 31, 2020
ASSETS
Current assets:
Cash and cash equivalents	$	3,185,478	$	1,490,219
Accounts receivable, net	7,777,064		8,671,163
Unbilled revenue	3,899,499		4,267,249
Employee retention credit	713,268		—
Inventories, net	6,811,525		7,168,596
Prepaid and other current assets	839,732		597,144
Total current assets	23,226,566		22,194,371
Long-term assets:
Property, plant and equipment, net	2,025,334		2,283,846
Right of use assets	2,168,100		1,632,574
Intangible assets, net	1,244,373		1,360,319
Goodwill	2,406,156		2,406,156
Other assets	248,713		196,387
TOTAL ASSETS	$	31,319,242	$	30,073,653
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Note payable	$	—	$	837,861
Accounts payable	2,597,737		4,183,105
Accrued expenses	2,138,931		1,993,471
Deferred revenue	1,119,943		1,294,157
Lease obligations, current	617,540		506,514
Total current liabilities	6,474,151		8,815,108
Long-term liabilities:
Note payable, net of current portion	1,874,269		1,036,339
Deferred revenue, net of current portion	244,425		115,329
Lease obligations, net of current portion	1,642,801		1,222,492
Deferred payroll tax liability, net of current portion	131,224		—
Unfavorable contract liability	1,438,278		1,617,051
Total liabilities	11,805,148		12,806,319
Commitments and contingencies (Note 12)
Stockholders’ equity:
Tecogen Inc. stockholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 24,850,261and 24,850,261 issued and outstanding at June 30, 2021 and December 31, 2020, respectively	24,850		24,850
Additional paid-in capital	56,908,194		56,814,428
Accumulated deficit	(37,363,283)		(39,529,621)
Total Tecogen Inc. stockholders’ equity	19,569,761		17,309,657
Non-controlling interest	(55,667)		(42,323)
Total stockholders’ equity	19,514,094		17,267,334
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	31,319,242	$	30,073,653

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

1

TECOGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited)

	Three Months Ended
	June 30, 2021		June 30, 2020
Revenues
Products	$	2,445,927	$	3,786,134
Services	3,328,314		3,372,583
Energy production	370,861		276,341
Total revenues	6,145,102		7,435,058
Cost of sales
Products	1,390,725		2,220,456
Services	1,679,386		2,102,735
Energy production	232,353		205,876
Total cost of sales	3,302,464		4,529,067
Gross profit	2,842,638		2,905,991
Operating expenses
General and administrative	2,438,452		2,637,479
Selling	580,871		602,383
Research and development	132,883		166,027
Total operating expenses	3,152,206		3,405,889
Loss from operations	(309,568)		(499,898)
Other income (expense)
Interest income and other expenses, net
Interest income and other income (expense), net	(1,125)		238
Interest expense	(5,088)		(56,253)
Employee retention credit	713,268		—
Unrealized gain (loss) on investment securities	18,749		(78,723)
Total other income (expense), net	725,804		(134,738)
Income (loss) before provision for state income taxes	416,236		(634,636)
Provision for state income taxes	7,933		13,171
Consolidated net income (loss)	408,303		(647,807)
(Income) loss attributable to the non-controlling interest	(8,672)		(6,081)
Net income (loss) attributable to Tecogen Inc.	$	399,631	$	(653,888)
Net income (loss) per share - basic	$	0.02	$	(0.03)
Net income (loss) per share - diluted	$	0.02	$	(0.03)
Weighted average shares outstanding - basic	24,850,261		24,850,261
Weighted average shares outstanding - diluted	25,125,210		24,850,261

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

2

TECOGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited)

	Six Months Ended
	June 30, 2021		June 30, 2020
Revenues
Products	$	4,568,649	$	6,837,894
Services	6,609,458		7,532,673
Energy production	1,024,156		1,027,191
Total revenues	12,202,263		15,397,758
Cost of sales
Products	2,565,012		4,023,339
Services	3,216,989		4,985,981
Energy production	626,416		690,280
Total cost of sales	6,408,417		9,699,600
Gross profit	5,793,846		5,698,158
Operating expenses
General and administrative	4,892,305		5,326,941
Selling	1,091,074		1,458,170
Research and development	259,033		530,363
Total operating expenses	6,242,412		7,315,474
Loss from operations	(448,566)		(1,617,316)
Other income (expense)
Interest and other income (expense), net	(2,328)		11,965
Interest expense	(9,728)		(116,238)
Gain on extinguishment of debt	1,887,859		—
Employee retention credit	713,268		—
Gain on sale of investment securities	6,046		—
Unrealized gain (loss) on investment securities	56,246		(98,404)
Total other income (expense), net	2,651,363		(202,677)
Income (loss) before provision for state income taxes	2,202,797		(1,819,993)
Provision for state income taxes	15,991		18,393
Consolidated net income (loss)	2,186,806		(1,838,386)
(Income) loss attributable to non-controlling interest	(20,468)		(17,889)
Net income (loss) attributable to Tecogen Inc.	$	2,166,338	$	(1,856,275)
Net income (loss) per share - basic	$	0.09	$	(0.07)
Net income (loss) per share - diluted	$	0.09	$	(0.07)
Weighted average shares outstanding - basic	24,850,261		24,850,256
Weighted average shares outstanding - diluted	25,102,470		24,850,256

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

3

TECOGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

For the Three and Six Months Ended June 30, 2021 and 2020

(unaudited)

Three months ended June 30, 2021	Common Stock Shares	Common Stock 0.001 Par Value		Additional Paid-In Capital		Accumulated Deficit		Non-controlling Interest		Total
Balance at March 31, 2021	24,850,261	$	24,850	$	56,853,513	$	(37,762,914)	$	(48,703)	$	19,066,746
Stock based compensation expense	—	—		54,681		—		—		54,681
Distributions to non-controlling interest	—	—		—		—		(15,636)		(15,636)
Net income	—	—		—		399,631		8,672		408,303
Balance at June 30, 2021	24,850,261	$	24,850	$	56,908,194	$	(37,363,283)	$	(55,667)	$	19,514,094
Six months ended June 30, 2021	Common Stock Shares	Common Stock 0.001 Par Value		Additional Paid-In Capital		Accumulated Deficit		Non-controlling Interest		Total
Balance at December 31, 2020	24,850,261	$	24,850	$	56,814,428	$	(39,529,621)	$	(42,323)	$	17,267,334
Stock based compensation expense	—	—		93,766		—		—		93,766
Distributions to non-controlling interest	—	—		—		—		(33,812)		(33,812)
Net income	—	—		—		2,166,338		20,468		2,186,806
Balance at June 30, 2021	24,850,261	$	24,850	$	56,908,194	$	(37,363,283)	$	(55,667)	$	19,514,094
Three months ended June 30, 2020	Common Stock Shares	Common Stock 0.001 Par Value		Additional Paid-In Capital		Accumulated Deficit		Non-controlling Interest		Total
Balance at March 31, 2020	24,850,261	$	24,850	$	56,665,319	$	(34,581,501)	$	73,995	$	22,182,663
Stock issuance costs	—	—		(401)		—		—		(401)
Stock based compensation expense	—	—		39,494		—		—		39,494
Net income (loss)	—	—		—		(653,888)		6,081		(647,807)
Balance at June 30, 2020	24,850,261	$	24,850	$	56,704,412	$	(35,235,389)	$	80,076	$	21,573,949
Six months ended June 30, 2020	Common Stock Shares	Common Stock 0.001 Par Value		Additional Paid-In Capital		Accumulated Deficit		Non-controlling Interest		Total
Balance at December 31, 2019	24,849,261	$	24,849	$	56,622,285	$	(33,379,114)	$	85,257	$	23,353,277
Exercise of stock options	1,000	1		1,199		—		—		1,200
Stock issuance costs	—	—		(802)		—		—		(802)
Stock based compensation expense	—	—		81,730		—		—		81,730
Distributions to non-controlling interest	—	—		—		—		(23,070)		(23,070)
Net income (loss)	—	—		—		(1,856,275)		17,889		(1,838,386)
Balance at June 30, 2020	24,850,261	$	24,850	$	56,704,412	$	(35,235,389)	$	80,076	$	21,573,949

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

4

TECOGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

	Six Months Ended
	June 30, 2021		June 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)	$	2,186,806	$	(1,838,386)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization, net	241,470		193,637
Gain on extinguishment of debt	(1,887,859)		—
Employee retention credit	(713,268)		—
Stock-based compensation	93,766		81,730
Gain on sale of investment securities	(6,046)		—
Unrealized (gain) loss on investment securities	(56,246)		98,404
Abandonment of intangible assets	7,400		179,944
Non-cash interest expense	—		50,775
Changes in operating assets and liabilities, net of effects of acquisitions:
(Increase) decrease in:
Accounts receivable	894,100		6,405,936
Unbilled revenue	367,750		538,032
Inventory	357,072		(890,868)
Prepaid expenses and other current assets	(242,588)		(6,382)
Other assets	(537,197)		532,293
Increase (decrease) in:
Accounts payable	(1,585,368)		(1,197,576)
Accrued expenses and other current liabilities	290,342		284,506
Deferred revenue	(45,118)		(1,671,239)
Other liabilities	531,335		—
Net cash provided by (used in) operating activities	(103,649)		2,760,806
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(47,504)		(53,674)
Proceeds from the sale of investment securities	11,637		—
Purchases of intangible assets	(5,682)		(123,254)
Payment of stock issuance costs	—		(802)
Distributions to non-controlling interest	(33,812)		(23,070)
Net cash used in investing activities	(75,361)		(200,800)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from note payable	1,874,269		1,874,200
Proceeds (payments) on revolving line of credit, net	—		(2,453,159)
Proceeds from the exercise of stock options	—		1,200
Net cash provided by (used in) financing activities	1,874,269		(577,759)
Change in cash and cash equivalents	1,695,259		1,982,247
Cash and cash equivalents, beginning of the period	1,490,219		877,676
Cash and cash equivalents, end of the period	$	3,185,478	$	2,859,923
Supplemental disclosures of cash flows information:
Cash paid for interest	$	—	$	36,326
Cash paid for taxes	$	15,991	$	5,222

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

5

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Note 1. Description of Business and Basis of Presentation

Description of Business

Tecogen Inc., or we, our or us, produces commercial and industrial engine-driven, combined heat and power (CHP) products that reduce energy costs, decrease greenhouse gas emissions and alleviate congestion on the national power grid. Our products supply electric power or mechanical power for cooling, while heat from the engine is recovered and purposefully used at a facility. We also install, own, operate and maintain complete energy systems and other complementary systems at customer sites and sell electricity, hot water, heat and cooling energy under long-term contracts at prices guaranteed to the customer to be below conventional utility rates.

The majority of our customers are located in regions with the highest utility rates, typically California, the Midwest and the Northeast.

Our common stock is quoted on OTC Markets Group, Inc.'s OTCQX Best Market tier and trades under the symbol "TGEN."

On May 18, 2017, the Company acquired 100% of the outstanding common stock of American DG Energy Inc., formerly a related entity, in a stock-for-stock merger.

Basis of Presentation

    The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the six months ended June 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021.

    The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

    For further information, refer to the consolidated financial statements and footnotes thereto included in Tecogen's Annual Report on Form 10-K for the year ended December 31, 2020.

    The accompanying unaudited condensed consolidated financial statements include our accounts and the accounts of entities in which we have a controlling financial interest. Those entities include our wholly-owned subsidiaries American DG Energy Inc., Tecogen CHP Solutions, Inc., and a joint venture, American DG New York, LLC, in which American DG Energy Inc. holds a 51% interest. Investments in partnerships and companies in which we do not have a controlling financial interest but where we have significant influence are accounted for under the equity method. Any intercompany transactions have been eliminated in consolidation.

    Our operations are comprised of two business segments. Our Products and Services segment designs, manufactures and sells industrial and commercial cogeneration systems as described above. Our Energy Production segment sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements.

Reclassification

    Certain prior period amounts have been reclassified to conform with current year presentation.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Income Taxes

    The provisions for income taxes in the accompanying unaudited consolidated statements of operations differ from that which would be expected by applying the federal statutory tax rate primarily due to losses for which no benefit is recognized.

6

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Employee Retention Credit

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was signed into law providing numerous tax provisions and other stimulus measures, including an employee retention credit (“ERC”), which is a refundable tax credit against certain employment taxes. The Taxpayer Certainty and Disaster Tax Relief Act of 2020 and the American Rescue Plan Act of 2021 extended and expanded the availability of the ERC.

Section 2301(c)(2)(B) of the CARES Act permits an employer to use an alternative quarter to calculate gross receipts and the employer may determine if the decline in gross receipt tests is met for a calendar quarter in 2021 by comparing its gross receipts for the immediately preceding calendar quarter with those for the corresponding calendar quarter in 2019. Accordingly, for the first quarter of 2021, we elected to use our gross receipts for the fourth calendar quarter of 2020 compared to our gross receipts for the fourth calendar quarter of 2019. As a result of our election to use an alternative quarter, we qualified for the ERC in the first and second quarters of 2021 because our gross receipts decreased by more than 20% from the first and second quarters of 2019. As a result of averaging 100 or fewer full-time employees in 2019, all wages paid to employees in the first and second quarters of 2021 were eligible for the ERC.

Accounting Standards Codification 105, "Generally Accepted Accounting Principles," describes the decision-making framework when no guidance exists in US GAAP for a particular transaction. Specifically, ASC 105-10-05-2 instructs companies to look for guidance for a similar transaction within US GAAP and apply that guidance by analogy. As such, forms of government assistance, such as the ERC, provided to business entities would not be within the scope of ASC 958, but it may be applied by analogy under ASC 105-10-05-2. We accounted for the Employee Retention Credit as a government grant in accordance with Accounting Standards Update 2013-06, Not-for-Profit Entities (Topic 958) ("ASU 2013-06") by analogy under ASC 105-10-05-2. Under this standard, government grants are recognized when the conditions or conditions on which they depend are substantially met. The conditions for recognition of the ERC include, but are not limited to:

•An entity has been adversely affected by the COVID-19 pandemic

•We have not used qualifying payroll for both the Paycheck Protection Program and the ERC

•We incurred payroll costs to retain employees

•The process for filing for the credit is an administrative task and not a barrier to receiving the credits

During the six months ended June 30, 2021, we recorded an ERC benefit of $713,268 in other income (expense), net in the our condensed consolidated statements of operations and as a current receivable in our condensed consolidated balance sheets as of June 30, 2021.

Note 2. Revenue

Revenue is recognized when performance obligations under the terms of a contract with our customer are satisfied; generally this occurs with the transfer of control of our products, services and energy production. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services or energy to customers.

Shipping and handling fees billed to customers in a sales transaction are recorded in revenue and shipping and handling costs incurred are recorded in cost of sales. We have elected to exclude from revenue any value add sales and other taxes which we collect concurrent with revenue-producing activities. These accounting policy elections are consistent with the manner in which we historically recorded shipping and handling fees and value-added taxes. Incremental costs incurred by us to obtain a contract with a customer are negligible, if any, and are expensed ratably in proportion to the related revenue recognized.

Disaggregated Revenue

In general, our business segmentation is aligned according to the nature and economic characteristics of our products and customer relationships and provides meaningful disaggregation of each business segment's results of operations.

7

The following table further disaggregates our revenue by major source by segment for the three and six months ended June 30, 2021 and 2020.

Three Months Ended	June 30, 2021
	Products and Services		Energy Production		Total
Products	$	2,445,927	$	—	$	2,445,927
Installation services	244,553		—		244,553
Maintenance services	3,083,761		—		3,083,761
Energy production	—		370,861		370,861
Total revenue	$	5,774,241	$	370,861	$	6,145,102

Six Months Ended	June 30, 2021
	Products and Services		Energy Production		Total
Products	$	4,568,649	$	—	$	4,568,649
Installation services	762,249		—		762,249
Maintenance services	5,847,209		—		5,847,209
Energy production	—		1,024,156		1,024,156
Total revenue	$	11,178,107	$	1,024,156	$	12,202,263

Three Months Ended	June 30, 2020
	Products and Services		Energy Production		Total
Products	$	3,786,134	$	—	$	3,786,134
Installation services	917,363		—		917,363
Maintenance services	2,455,220		—		2,455,220
Energy production	—		276,341		276,341
Total revenue	$	7,158,717	$	276,341	$	7,435,058

Six Months Ended	June 30, 2020
	Products and Services		Energy Production		Total
Products	$	6,837,894	$	—	$	6,837,894
Installation services	2,611,505		—		2,611,505
Maintenance services	4,921,168		—		4,921,168
Energy production	—		1,027,191		1,027,191
Total revenue	$	14,370,567	$	1,027,191	$	15,397,758

Product and Services Segment

Products. Our Product revenues include cogeneration systems that supply electricity and hot water, chillers that provide air-conditioning and hot water and engineered accessories, which consist of ancillary products and parts necessary to install a cogeneration unit including integration into the customers’ existing electrical and mechanical systems. Prior to January 1, 2021, engineered accessories revenue and cost of sales had been reported in our financial statements under Installation Services. Engineered accessories revenue and cost of sales from prior periods have been reclassified to conform with the current year presentation. We refer to the package of engineered accessories and engineering and design services necessary for the customers' installation of a cogeneration unit as light installation services.

We transfer control and generally recognize a sale when we ship a product from our manufacturing facility at which point the customer takes ownership of the product. Payment terms on product sales are generally 30 days.

8

We recognize revenue in certain circumstances before delivery to the customer has occurred (commonly referred to as bill and hold transactions). We recognize revenue related to such transactions once, among other things, the customer has made a written fixed commitment to purchase the product(s) under normal billing and credit terms, the customer has requested the product(s) be held for future delivery as scheduled and designated by them, risk of ownership has been assumed by the customer, and the product(s) are tagged as sold and segregated for storage awaiting further direction from the customer. Due to the infrequent nature and duration of bill and hold arrangements, the value associated with custodial storage services is deemed immaterial in the context of the contract and in total, and accordingly, none of the transaction price is allocated to such service.

Depending on the product and terms of the arrangement, we may defer the recognition of a portion of the transaction price received because we have to satisfy a future obligation (e.g., product start-up service). Amounts allocated to product start-up services are recognized as revenue when the start-up service has been completed. We use an observable selling price to determine standalone selling prices where available and either a combination of an adjusted market assessment approach, an expected cost plus a margin approach, and/or a residual approach to determine the standalone selling prices for separate performance obligations as a basis for allocating contract consideration when an observable selling price is not available. Amounts received but not recognized pending completion of performance are recognized as contract liabilities and are recorded as deferred revenue along with deposits by customers.

Installation Services. We provide installation services typically including all necessary engineering and design, labor, subcontract labor and service to install a cogeneration unit including integration into the customers’ existing electrical and mechanical systems.

Under complete turnkey installation service contracts revenue is recognized over time using the percentage-of-completion method determined on a cost to cost basis. Our performance obligation under such contracts is satisfied progressively over time as enhancements are made to customer owned and controlled properties. We measure progress towards satisfaction of the performance obligation based on an cost-based input method which we believe appropriately measures and is the most accurate depiction of the transfer of products and services to the customer under these contracts. When the financial metrics of a contract indicate a loss, our policy is to record the entire expected loss as soon as it is known. Contract costs and profit recognized to date under the percentage-of-completion method in excess of billings are recognized as contract assets and are recorded as unbilled revenue. Billings in excess of contract costs and profit are recognized as contract liabilities and are recorded as deferred revenue. Generally billings under complete turnkey installation contracts are made when contractually determined milestones of progress have been achieved, with payment terms generally being 30 days.

Maintenance Services. Maintenance services are provided under either long-term maintenance contracts or time and material maintenance contracts. Revenue under time and material maintenance contracts is recognized when the maintenance service is completed. Revenue under long-term maintenance contracts is recognized either ratably over the term of the contract where the contract price is fixed or when the periodic maintenance activities are completed where the invoiced cost to the customer is based on run hours or kilowatts produced in a given period. We use an output method to measure progress towards completion of our performance obligation which results in the recognition of revenue on the basis of a direct measurement of the value to the customer of the services transferred to date relative to the remaining services promised under the contract. We use the practical expedient at ASC 606-10-55-18 of recognizing revenue in an amount equal to the amount we have the right to invoice the customer under the contract. Payment terms for maintenance services are generally 30 days.

Energy Production Segment

    Energy Production. Revenue from energy contracts is recognized when electricity, heat, hot and/or chilled water is produced by our owned on-site cogeneration systems. Each month we invoice the customer and recognize revenue for the various forms of energy delivered, based on actual meter readings which capture the quantity of the various forms of energy delivered in a given month, under a contractually defined formula which takes into account the current month's cost of energy from the local power utility.

As the various forms of energy delivered by us under energy production contracts are simultaneously delivered and consumed by the customer, our performance obligation under these contracts is considered to be satisfied over time. We use an output method to measure progress towards completion of our performance obligation which results in the recognition of revenue on the basis of a direct measurement of the value to the customer of the services transferred to date relative to the remaining services promised under the contract. We use the practical expedient at ASC 606-10-55-18 of recognizing revenue in an amount equal to the amount that we have the right to invoice the customer under the contract. Payment terms on invoices under these contracts are generally 30 days.

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Contract Balances

    The timing of revenue recognition, billings and cash collections result in billed accounts receivable, unbilled revenue (contract assets) and deferred revenue, consisting of customer deposits and billings in excess of revenue recognized (contract liabilities) on the condensed consolidated balance sheets.

    Revenue recognized during the six months ended June 30, 2021 that was included in unbilled revenue at the end of the period was approximately $0.9 million. Approximately $1.3 million was billed in this period that had been recognized as revenue in previous periods.

    Revenue recognized during the six months ended June 30, 2021 that was included in deferred revenue at the beginning of the period was approximately $0.7 million.

Remaining Performance Obligations

Remaining performance obligations related to ASC 606 represent the aggregate transaction price allocated to performance obligations with an original contract term of greater than one year, excluding certain maintenance contracts and all energy production contracts where a direct measurement of the value to the customer is used as a method of measuring progress towards completion of our performance obligation. Exclusion of these remaining performance obligations is due in part to the inability to quantify values based on unknown future levels of delivery and in some cases rates used to invoice customers. Remaining performance obligations therefore consist of unsatisfied or partially satisfied performance obligations related to fixed price maintenance contracts and installation contracts.

As of June 30, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $1.4 million. We expect to recognize revenue of approximately 86.8% of the remaining performance obligations over the next 24 months, 82.1% recognized in the first 12 months and 4.7% recognized over the subsequent 12 months, and the remainder recognized thereafter.

Note 3. Income (loss) Per Common Share

Basic and diluted income (loss) per share for the three and six months ended June 30, 2021 and 2020, respectively, were as follows: 

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Numerator:
Net income (loss) available to stockholders	$	399,631	$	(653,888)	$	2,166,338	$	(1,856,275)
Denominator:
Weighted average shares outstanding - Basic	24,850,261		24,850,261		24,850,261		24,850,256
Effect of dilutive securities:
Stock options	274,949		—		252,209		—
Weighted average shares outstanding - Diluted	25,125,210		24,850,261		25,102,470		24,850,256
Basic income (loss) per share	$	0.02	$	(0.03)	$	0.09	$	(0.07)
Diluted income (loss) per share	$	0.02	$	(0.03)	$	0.09	$	(0.07)
Anti-dilutive shares underlying stock options outstanding	985,296		1,270,666		777,296		1,269,662

Note 4. Inventories, net

Inventories at June 30, 2021 and December 31, 2020 consisted of the following:

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	June 30, 2021		December 31, 2020
Raw materials	$	6,414,152	$	6,227,591
Less: reserves	(381,000)		(381,000)
Raw materials, net	$	6,033,152	$	5,846,591
Work-in-process	345,228		329,702
Finished goods	433,145		992,303
Total inventories, net	$	6,811,525	$	7,168,596

Note 5. Property, Plant and Equipment, net

Property, plant and equipment at June 30, 2021 and December 31, 2020 consisted of the following:

	Estimated Useful Life (in Years)	June 30, 2021		December 31, 2020
Energy systems	1 - 15 years	$	3,556,488	$	3,526,514
Machinery and equipment	5 - 7 years	1,495,528		1,448,024
Furniture and fixtures	5 years	193,698		193,698
Computer software	3 - 5 years	192,865		192,865
Leasehold improvements	*	450,792		450,792
		5,889,371		5,811,893
Less - accumulated depreciation and amortization		(3,864,037)		(3,528,047)
		$	2,025,334	$	2,283,846

* Lesser of estimated useful life of asset or lease term

Depreciation and amortization expense on property and equipment for the three and six months ended June 30, 2021 and 2020 was $145,458 and $306,014 and $176,357 and $352,017, respectively.

Note 6. Intangible Assets and Liabilities Other Than Goodwill

As of June 30, 2021 and December 31, 2020 the Company had the following amounts related to intangible assets and liabilities other than goodwill:

	June 30, 2021						December 31, 2020
Intangible assets	Cost		Accumulated Amortization		Total		Cost		Accumulated Amortization		Total
Product certifications	$	726,159	$	(505,542)	$	220,617	$	726,159	$	(478,357)	$	247,802
Patents	853,296		(268,379)		584,917		855,014		(220,764)		634,250
Developed technology	240,000		(132,000)		108,000		240,000		(124,000)		116,000
Trademarks	26,896		—		26,896		26,896		—		26,896
In Process R&D	263,936		(9,426)		254,510		263,936		—		263,936
Favorable contract asset	384,465		(335,032)		49,433		384,465		(313,030)		71,435
	$	2,494,752	$	(1,250,379)	$	1,244,373	$	2,496,470	$	(1,136,151)	$	1,360,319
Intangible liability
Unfavorable contract liability	$	2,534,818	$	(1,096,540)	$	1,438,278	$	2,534,818	$	(917,767)	$	1,617,051

The aggregate amortization expense related to intangible assets and liabilities exclusive of contract related intangibles for the three and six months ended June 30, 2021 and 2020 was $51,187 and $94,077 and $20,312 and $43,128 respectively. The net credit to cost of sales related to the amortization of contract related intangible assets and liabilities for the six months ended June 30, 2021 and 2020 was $79,569 and $158,622 and $95,364 and $203,361, respectively. During the six months

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ended June 30, 2021 and 2020, we abandoned certain patent applications amounting to $7,400 and $179,944, respectively, and recorded an abandonment charge in general and administrative expenses in each respective period.

Favorable/Unfavorable Contract Assets and Liabilities

The favorable contract asset and unfavorable contract liability in the foregoing table represent the estimated fair value of American DG Energy's customer contracts (both positive for favorable contracts and negative for unfavorable contracts) which were acquired by us in May 2017.

Amortization of intangibles including contract related amounts is calculated using the straight-line method over the remaining useful life or contract term. Aggregate future amortization over the next five years and thereafter is estimated to be as follows:

Year 1	$	(127,451)
Year 2	(94,816)
Year 3	(52,826)
Year 4	(7,080)
Year 5	60,360
Thereafter	1,012
Total	$	(220,801)

Note 7. Sale of Energy Producing Assets and Goodwill Impairment

    During the first quarter of 2019 we recognized two individual sales of energy producing assets, for a total of eight power purchase agreements, including the associated energy production contracts for total consideration of $7 million.

    In connection with these assets sales, we entered into agreements with the purchaser to maintain and operate the assets over the remaining periods of the associated energy production contracts (through August 2033 and January 2034, respectively) in exchange for monthly maintenance and operating fees. These agreements contain provisions whereby we have guaranteed to the purchaser a minimum level or threshold of cash flows from the associated energy production contracts. Actual results are compared to the minimum threshold bi-annually and we are contractually obligated to reimburse any shortfall to the purchaser. To the extent actual cash flow results exceed the minimum threshold, we are entitled to fifty percent of such excess under the agreements. As of June 30, 2021, we had a $21,051 receivable representing our share of the excess bi-annual cash flows for the period ended June 30, 2021.

    The foregoing agreements also contain provisions whereby we have agreed to make whole the purchaser in the event the counterparty to the energy production contract(s) defaults on or otherwise terminates before the stated expiration of the energy production contract. Should we be required to make whole the purchaser under such provisions, we would be entitled to seek recovery from the counterparty to the energy production contract(s) under a similar provision contained in those contracts in respect of early termination.

    We are also responsible under the agreements for site decommissioning costs, if any, in excess of certain threshold amounts by site. Decommissioning of site assets is performed when, if and as requested by the counterparty to the energy production contract upon termination of the energy production contract.    

Note 8. Leases

    Our leases principally consist of operating leases related to our corporate office, field offices, and our research, manufacturing and storage facilities.

    At inception, we determine if an arrangement contains a lease and whether that lease meets the classification criteria of a finance or operating lease. Some of our lease agreements contain lease components (e.g. minimum rent payments) and non-lease components (e.g. maintenance, labor charges, etc.). We account for each component separately based on the estimated standalone price of each component.

    Operating leases are included in Right-of-use assets, Lease obligations, current and Lease obligations, long term on the condensed consolidated balance sheets. These assets and liabilities are recognized at the commencement date based on the present value of remaining lease payments over the lease term and using an incremental borrowing rate consistent with the lease terms or implicit rates, when readily determinable. For those leases where it is reasonably certain at the commencement date

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that we will exercise the option to extend the lease, then the lease term will include the lease extension term. Short-term operating leases, which have an initial term of 12 months or less, are not recorded on the balance sheet.

    Lease expense for operating leases, which principally consist of fixed payments for base rent, is recognized on a straight-line basis over the lease term. Lease expense for the three and six months ended June 30, 2021 and 2020 was $198,943 and $394,216 and $196,103 and $386,138, respectively.

    Supplemental information related to leases for the six months ended June 30, 2021 was as follows:

Cash paid for amounts included in the measurement of operating lease liabilities	$	352,579
Weighted-average remaining lease term - operating leases	4.3 years
Weighted-average discount rate - operating leases	6		%

    Future minimum lease commitments under non-cancellable operating leases as of June 30, 2021 were as follows:

	Operating Leases
Year 1	$	363,163
Year 2	734,110
Year 3	745,417
Year 4	299,424
Year 5	108,799
Thereafter	331,128
Total lease payments	2,582,041
Less: imputed interest	321,700
Total	$	2,260,341

Note 9. Stock-Based Compensation

Stock-Based Compensation

We adopted a 2006 Stock Option and Incentive Plan, or the Plan, under which the Board of Directors may grant incentive or non-qualified stock options and stock grants to key employees, directors, advisors and consultants. The Plan was amended at various dates by the Board of Directors to increase the reserved shares of common stock issuable under the Amended Plan to 3,838,750 as of June 30, 2021, and in June 2017 stockholders approved an amendment to extend the termination date of the Plan to January 1, 2026 and ratified all of our option grants issued after January 1, 2016 (the "Amended Plan").

Stock options vest based upon the terms within the individual option grants, with an acceleration of the unvested portion of such options upon a change in control event, as defined in the Amended Plan. The options are not transferable except by will or domestic relations order. The option price per share under the Amended Plan cannot be less than the fair market value of the underlying shares on the date of the grant. The number of shares remaining available for future issuance under the Amended Plan as of June 30, 2021 was 807,312.

Stock option activity for the six months ended June 30, 2021 was as follows: 

Common Stock Options	Number of Options	Exercise Price Per Share	Weighted Average Exercise Price		Weighted Average Remaining Life	Aggregate Intrinsic Value
Outstanding, December 31, 2020	2,496,242	$0.71-$10.33	$	1.94	7.37 years	$	731,744
Granted	208,000	$1.75	$	1.75
Exercised	—
Canceled and forfeited	(253,500)	$2.60	$	2.60
Outstanding, June 30, 2021	2,450,742	$0.71-$10.33	$	1.86	7.88 years	$	1,709,243
Exercisable, June 30, 2021	666,408		$	4.00		$	27,583
Vested and expected to vest, June 30, 2021	2,183,092		$	1.96		$	1,456,994

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Consolidated stock-based compensation expense for the three and six months ended June 30, 2021 and 2020 was $54,681 and $93,766 and $39,494 and $81,730, respectively. No tax benefit was recognized related to the stock-based compensation recorded during the period.

At June 30, 2021 the total compensation cost related to unvested stock option awards not yet recognized is $563,847 and this amount will be recognized over a weighted average period of 2.12 years.

Note 10. Fair Value Measurements

    The fair value topic of the FASB Accounting Standards Codification defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting guidance also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

 Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. We currently do not have any Level 1 financial assets or liabilities.

 Level 2 - Observable inputs other than quoted prices included in Level 1. Level 2 inputs include quoted prices for identical assets or liabilities in non-active markets, quoted prices for similar assets or liabilities in active markets and inputs other than quoted prices that are observable for substantially the full term of the asset or liability. We have Level 2 financial assets and liabilities as provided below.

 Level 3 - Unobservable inputs reflecting management’s own assumptions about the input used in pricing the asset or liability. We do not currently have any Level 3 financial assets or liabilities.

    The following tables presents the asset reported in "other assets" in the consolidated balance sheet measured at its fair value on a recurring basis as of June 30, 2021 and 2020 by level within the fair value hierarchy.

June 30, 2021			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
Description	Total		Level 1		Level 2		Level 3
Recurring fair value measurements
Marketable equity securities
EuroSite Power Inc.	$	168,739	$	—	$	168,739	$	—
Total recurring fair value measurements	$	168,739	$	—	$	168,739	$	—
June 30, 2020			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
Description	Total		Level 1		Level 2		Level 3
Recurring fair value measurements
Marketable equity securities
EuroSite Power Inc.	$	118,084	$	—	$	118,084	$	—
Total recurring fair value measurements	$	118,084	$	—	$	118,084	$	—

    We utilize a Level 2 category fair value measurement to value its investment in EuroSite Power, Inc. as a marketable equity security at period end. That measurement is equal to the quoted market closing price at period end. Since this security is not actively traded we classify it as Level 2.

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    The following table summarizes changes in Level 2 assets which are comprised of marketable equity securities for the six months ended June 30, 2021 and 2020:

Fair value at December 31, 2020	$	118,084
Sale of 93,187 shares	(5,591)
Unrealized gain	56,246
Fair value at June 30, 2021	$	168,739
Fair value at December 31, 2019	$	216,487
Unrealized loss	(98,403)
Fair value at June 30, 2020	$	118,084

During the six months ended June 30, 2021, we received net proceeds of $11,637 from the sale of 93,187 shares of Eurosite Power, Inc. common stock, and recognized a realized gain of $6,046 which is included in other income (expense), net in the condensed consolidated statements of operations.

Note 11. Revolving Line of Credit and Notes Payable

    On May 4, 2018 we entered into a Credit Agreement with Webster Business Credit Corporation ("Webster") that provided a line of credit of up to $10 million to us on a revolving and secured basis, with availability based on certain accounts receivables, raw materials, and finished goods.

    Borrowings under the Credit Agreement bore interest at a rate equal to, at our option, either (1) One Month LIBOR, plus 3.00%, or (2) Webster’s Base Rate, plus 1.5%. Webster’s Base Rate is defined as the highest of (a) the Federal Funds rate plus 0.5%, (b) Webster’s Prime Rate as adjusted by bank from time to time, and (c) One Month LIBOR, plus 2.75%.

    The Credit Agreement contained certain affirmative and negative covenants applicable to us, which included, among other things, restrictions on our ability to (i) incur additional indebtedness, (ii) make certain investments, (iii) acquire other entities, (iv) dispose of assets and (v) make certain payments including those related to dividends or repurchase of equity. The Credit Agreement also contains financial covenants including maintaining a fixed charge coverage ratio of not less than 1.10:1.00 and we may not make any financed capital expenditures in excess of $500,000 in the aggregate in any fiscal year.

    The $145,011 of costs incurred in connection with the issuance of the revolving credit facility were capitalized and were being amortized to interest expense on a straight-line basis over three years based on the contractual term of the Agreement. For the three and six months ended ended June 30, 2020 we amortized $38,276 and $50,775, respectively, of deferred debt issuance cost.

On May 11, 2020, we terminated our Credit Agreement with Webster, together with several related agreements including, a Revolving Note Security Agreement, Blocked Account Agreement, and Master Letter of Credit Agreement. We paid an early termination fee of $25,000 to terminate the Credit Agreement. As of May 11, 2020, the outstanding balance under the line of credit and accrued and unpaid interest was $0.

On April 17, 2020, we obtained an unsecured loan through Webster Bank, N.A. in the amount of $1,874,200 in connection with the Paycheck Protection Program pursuant to the Coronavirus Aid, Relief, and Economic Security Act, as amended ("CARES Act”) administered by the United States Small Business Administration ("SBA"). The loan was guaranteed by the SBA. Interest on the loan balance was at the rate of 1% per year, and as a result of the enactment of the Paycheck Protection Program Flexibility Act of 2020 (“PPP Flexibility Act”), repayment of the loan balance could be deferred until August 2021, at which time the balance would be payable in 18 monthly installments of $106,356 with the final payment due in January 2023 if not forgiven in accordance with the CARES Act and the terms of the Promissory Note executed by us in connection with the loan. The loan could be prepaid at any time without penalty. The loan agreement and promissory note include customary provisions for a loan of this type, including prohibitions on our payment of dividends or repurchase of shares of our common stock while the loan remains outstanding. The loan agreement and promissory note also defines events of default to include, among other things, payment defaults, breaches of provisions of the loan agreement or the promissory note and cross-defaults on other loans, if applicable.

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On January 19, 2021, we received a letter dated January 12, 2021 from Webster Bank, NA confirming that the Paycheck Protection Program Loan issued to us pursuant to the CARES Act, as amended, in the original principal amount of $1,874,200 together with accrued interest of $13,659 was forgiven in full as of January 11, 2021. We have accounted for the loan forgiveness of $1,887,859 as debt extinguishment in accordance with Accounting Standards Update 2020-09, Debt (Topic 470) ("ASU 2020-09") and reported as a separate component of other income (expense), net in the condensed consolidated statements of operations for the six months ended June 30, 2021. The loan forgiveness is expected to be nontaxable for both state and federal purposes and has been treated accordingly in our condensed consolidated financial statements.

On February 5, 2021, we obtained a Paycheck Protection Program Second Draw unsecured loan through Webster Bank, N.A. in the amount of $1,874,269 pursuant to the CARES Act. The loan is guaranteed by the SBA. Interest on the loan balance is at the rate of 1% per year, and repayment of the loan balance is deferred until June 5, 2022. If not forgiven in accordance with the CARES Act, as amended, the loan is repayable in forty-four (44) monthly installments of $43,400 beginning July 5, 2022 with final payment due on February 5, 2026. The loan may be prepaid at any time without penalty. The loan agreement and promissory note include customary provisions for a loan of this type, including prohibitions on our payment of dividends or repurchase of shares of our common stock while the loan remains outstanding. The loan agreement and promissory note defines events of default to include, among other things, payment defaults, breaches of provisions of the loan agreement or the promissory note and cross-defaults on other loans, if applicable.

We anticipate that 100% of the loan proceeds will be used for covered expenses, payroll, rent, and utilities (which are costs expected to be eligible for loan forgiveness under the CARES Act and the Promissory Note) during the 24 week Covered Period following the disbursement of the loan as permitted under the PPP Flexibility Act in order to maximize the amount forgivable under the loan. We intend to submit a loan forgiveness application before the end of September 2021. There can be no assurance our application for forgiveness will be granted and in what amount. Such forgiveness is subject to an application to, and approval by, the SBA and may also be subject to further requirements in any regulations and guidelines the SBA may adopt. To the extent that there is a loan balance after the application of permissible forgiveness, we may seek to extend the loan maturity for the remaining balance to the maximum maturity of five years as permitted under the CARES Act as amended by the PPP Flexibility Act.

Note 12. Commitments and Contingencies

    We guarantee certain obligations of EuroSite Power Inc, a former subsidiary of American DG Energy Inc. These guarantees include a payment performance guarantee in respect of collateralized equipment financing loans, with a remaining principal amount outstanding subject to the guarantee at June 30, 2021 of approximately $29,013 due ratably in equal installments through September 2021, and certain guarantees of performance in respect of certain customer contracts. Based on current conditions, we do not believe there to be any amounts probable of payment by us under any of the guarantees and have estimated the value associated with the non-contingent aspect of the guarantees is approximately $7,000 which is recorded as a liability in the condensed consolidated balance sheets.

Note 13. Segments

    As of June 30, 2021, we were organized into two operating segments through which senior management evaluates our business. These segments, as described in more detail in Note 1, are organized around the products and services provided to customers and represent our reportable segments. The following table presents information by reportable segment for the three and six months ended June 30, 2021 and 2020:

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	Products and Services		Energy Production		Corporate, other and elimination (1)		Total
Three months ended June 30, 2021
Revenue - external customers	$	5,774,241	$	370,861	$	—	$	6,145,102
Intersegment revenue	56,988		—		(56,988)		—
Total revenue	$	5,831,229	$	370,861	$	(56,988)	$	6,145,102
Gross profit	$	2,704,130	$	138,508	$	—	$	2,842,638
Identifiable assets	$	26,804,525	$	4,514,717	$	—	$	31,319,242
Three months ended June 30, 2020
Revenue - external customers	$	7,158,717	$	276,341	$	—	$	7,435,058
Intersegment revenue	83,050		—		(83,050)		—
Total revenue	$	7,241,767	$	276,341	$	(83,050)	$	7,435,058
Gross profit	$	2,835,526	$	70,465	$	—	$	2,905,991
Identifiable assets	$	20,343,337	$	2,973,048	$	12,557,068	$	35,873,453
Six months ended June 30, 2021
Revenue - external customers	$	11,178,107	$	1,024,156	$	—	$	12,202,263
Intersegment revenue	188,504		—		(188,504)		—
Total revenue	$	11,366,611	$	1,024,156	$	(188,504)	$	12,202,263
Gross profit	$	5,396,105	$	397,741	$	—	$	5,793,846
Identifiable assets	$	26,804,525	$	4,514,717	$	—	$	31,319,242
Six months ended June 30, 2020
Revenue - external customers	$	14,370,567	$	1,027,191	$	—	$	15,397,758
Intersegment revenue	231,710		—		(231,710)		—
Total revenue	$	14,602,277	$	1,027,191	$	(231,710)	$	15,397,758
Gross profit	$	5,361,247	$	336,911	$	—	$	5,698,158
Identifiable assets	$	20,343,337	$	2,973,048	$	12,557,068	$	35,873,453
(1) Corporate, intersegment revenue, other and elimination includes various corporate assets.

Note 14. Subsequent Events

    We have evaluated subsequent events through the date of this filing and determined that no material subsequent events occurred that would require recognition in the consolidated financial statements or disclosure in the notes thereto.

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

This Management’s Discussion and Analysis of Financial Condition and Results of Operations and other parts of this Quarterly Report on Form 10-Q (“Form 10-Q”) contain forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995, that involve risks and uncertainties. Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. Forward-looking statements provide current expectations of future events based on certain assumptions and include any statement that does not directly relate to any historical or current fact. For example, statements in this Form 10-Q regarding the potential future impact of the COVID-19 pandemic on our business and results of operations are forward-looking statements. Forward-looking statements can also be identified by words such as “future,” “anticipates,” “believes,” “estimates,” “expects,” “intends,” “plans,” “predicts,” “will,” “would,” “could,” “can,” “may,” and similar terms. Forward-looking statements are not guarantees of future performance and our actual results may differ significantly from the results discussed in the forward-looking statements. Such forward-looking statements include, among other things, statements regarding the impact of the coronavirus pandemic on demand for our products and services, the availability of incentives, rebates, and tax benefits relating to our products, changes in the regulatory environment relating to our products, competing technological developments, and the availability of financing to fund our operations and growth. Factors that might cause such differences include, but are not limited to, those discussed in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2020 (“2020 Form 10-K”), as supplemented, and Part II, Item 1A of this Form 10-Q, in each case under the heading “Risk Factors.” The following discussion should be read in conjunction with the 2020 Form 10-K filed with the Securities and Exchange Commission (“SEC”) and the condensed consolidated financial statements and accompanying notes included in Part I, Item 1 of this Form 10-Q. Each of the terms “Tecogen,” “we,” “our,” and “us” as used herein refer collectively to Tecogen Inc. and our wholly owned subsidiaries, unless otherwise stated. While we may elect to update forward-looking statements in the future, we specifically disclaim any obligation to do so, even if our estimates change, and you should not rely on those forward-looking statements as representing ours views as of any date subsequent to the date of the filing of this Form 10-Q.

Recent Developments

Paycheck Protection Program Loans and Employee Retention Credit

On April 17, 2020, we obtained an unsecured loan in the principal amount of $1,874,200 from Webster Bank, NA ("Webster") under the Paycheck Protection Program adopted pursuant to the Coronavirus Aid, Relief and Economic Recovery Act, as amended ("CARES Act"). The loan was forgivable if the proceeds were utilized by us for payroll, utilities, and rent expenses. On January 19, 2021 we received confirmation from Webster that the Paycheck Protection Program Loan in the original principal amount of $1,874,200 together with accrued interest of $13,659 was forgiven in full effective as of January 11, 2021. The loan forgiveness of $1,887,859 was accounted for as debt extinguishment and is reported as a separate component of other income (expense), net in the condensed consolidated statements of earnings for the six months ended June 30, 2021.

On February 5, 2021, we obtained a Paycheck Protection Program Second Draw unsecured loan through Webster in the amount of $1,874,269 in connection with the Paycheck Protection Program pursuant to the CARES Act. The loan is guaranteed by the United States Small Business Administration.

In March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was signed into law providing numerous tax provisions and other stimulus measures, including an employee retention credit (“ERC”), which is a refundable tax credit against certain employment taxes. The Taxpayer Certainty and Disaster Tax Relief Act of 2020 and the American Rescue Plan Act of 2021 extended and expanded the availability of the ERC. The ERC is available through December 31, 2021 and is equal to 70% of qualified wages (which includes employer qualified health plan expenses) paid to employees. In addition, the availability of the ERC was permitted to entities that received a Paycheck Protection Loan subject to certain conditions. During each quarter in 2021, a maximum of $10,000 in qualified wages for each employee is eligible for the ERC. Therefore, the maximum tax credit that can be claimed by an eligible employer in 2021 is $7,000 per employee per calendar quarter. Section 2301(c)(2)(B) of the CARES Act permits an employer to use an alternative quarter to calculate gross receipts and the employer may determine if the decline in gross receipt tests is met for a calendar quarter in 2021 by comparing its gross receipts for the immediately preceding calendar quarter with those for the corresponding calendar quarter in 2019. Accordingly, for the first quarter of 2021, we elected to use our gross receipts for the fourth calendar quarter of 2020 compared to our gross receipts for the fourth calendar quarter of 2019. As a result of our election to use an alternative quarter, we

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qualified for the ERC in the first and second quarters of 2021 because our gross receipts decreased by more than 20% from the first and second quarters of 2019. As a result of averaging 100 or fewer full-time employees in 2019, all wages paid to employees in the first and second quarters of 2021 were eligible for the ERC (rather than just wages paid to employees not providing services). During the six months ended June 30, 2021, we recorded an ERC benefit of $713,268 in other income (expense), net in our condensed consolidated statements of operations.

COVID-19 Update

During the first quarter of fiscal 2020, a novel strain of coronavirus (“COVID-19”) began spreading rapidly throughout the world, prompting governments and businesses to take unprecedented measures in response. Such measures included restrictions on travel and business operations, temporary closures of businesses, and quarantines and shelter-in-place orders. The COVID-19 pandemic has significantly curtailed global economic activity and caused significant volatility and disruption in global financial markets. The COVID-19 pandemic and the measures taken by U.S. Federal, state and local governments in response have materially adversely affected and could in the future materially adversely impact our business, results of operations, financial condition, and stock price. The pandemic has impacted our operations, revenues and cash flows and the future impact of the pandemic remains uncertain. It may be affected by factors including growth in the number of infections, any increase in the prevalence of highly transmissible COVID-19 variants, the duration of the pandemic, steps taken to combat the pandemic, and the availability and acceptance of effective treatments.

We have made every effort to keep our employees who operate our business safe and minimize unnecessary risk of exposure to the virus. Our service centers have continued to operate due to our essential services designation, however from time to time our service personnel have been unable to perform maintenance services for customers that temporarily ceased or reduced operations at facilities served by our equipment, and certain customers closed their operations, reducing the amount of energy produced and sold to customers during these periods. During the three-month period ended June 30, 2021, we did see a recovery in our energy production revenues as normal business operations are beginning to resume due to the lifting of government-imposed COVID-19 restrictions. During the pandemic we have also experienced slower payments from certain customers. These business interruptions resulted in reductions in service and installation revenue, energy production revenue, and margins in the affected portions of our business.

Overview

Tecogen designs, manufactures and sells industrial and commercial cogeneration systems that produce combinations of electricity, hot water and air conditioning using automotive engines that have been adapted to run on natural gas. In some cases, our customers may choose to have us engineer and install the system for them rather than simply purchase the cogeneration and/or chiller units, which we refer to as "turnkey" projects. Cogeneration systems are efficient because, in addition to supplying mechanical energy to power electric generators or compressors – displacing utility supplied electricity – they provide an opportunity for the facility to incorporate the engine’s waste heat into onsite processes, such as space and potable water heating. We produce standardized, modular, small-scale products, with a limited number of product configurations that are adaptable to multiple applications. We refer to these combined heat and power products as CHP (electricity plus heat) and MCHP (mechanical power plus heat).

Our products are sold directly to end-users by our in-house marketing team and by established sales agents and representatives. We have agreements in place with distributors and sales representatives. Our existing customers include hospitals and nursing homes, colleges and universities, health clubs and spas, hotels and motels, office and retail buildings, food and beverage processors, multi-unit residential buildings, laundries, ice rinks, swimming pools, factories, municipal buildings, military installations and indoor growing facilities. We have an installed base of more than 3,000 units. Our products have long useful lives with proper maintenance. Some of our units have been operating for over 35 years.

With the acquisition of American DG Energy Inc. ("ADGE") in May 2017, we added an additional source of revenue. Through ADGE, we install, own, operate and maintain complete distributed generation of electricity systems, or DG systems or energy systems, and other complementary systems at customer sites, and sell electricity, hot water, heat and cooling energy under long-term contracts at prices guaranteed to the customer to be below conventional utility rates. Each month we obtain readings from our energy meters to determine the amount of energy produced for each customer. We use a contractually defined formula to multiply these readings by the appropriate published price of energy (electricity, natural gas or oil) from each customer's local energy utility, to derive the value of our monthly energy sale, which includes a negotiated discount. Our revenues per customer on a monthly basis vary based on the amount of energy produced by our energy systems and the published price of energy (electricity, natural gas or oil) from our customer's local energy utility that month.

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Our operations are comprised of two business segments. Our Products and Services segment designs, manufactures and sells industrial and commercial cogeneration systems as described above. Our Energy Production segment sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements.

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Results of Operations

Second Quarter of 2021 Compared to Second Quarter of 2020

The following table sets forth for the periods indicated, the percentage of net sales represented by certain items reflected in our condensed consolidated statements of operations:

	Three Months Ended
	June 30, 2021		June 30, 2020
Revenues	100.0%		100.0%
Cost of sales	53.7%		60.9%
Gross profit	46.3%		39.1%
Operating expenses
General and administrative	39.7%		35.5%
Selling	9.5%		8.1%
Research and development	2.2%		2.2%
Total operating expenses	51.3%		45.8%
Loss from operations	(5.0)	%	(6.7)	%
Total other income (expense), net	11.8%		(1.8)	%
Consolidated net income (loss)	6.6%		(8.7)	%
Income attributable to the non-controlling interest	(0.1)	%	(0.1)	%
Net income (loss) attributable to Tecogen, Inc.	6.5%		(8.8)	%

Revenues

The following table presents revenue for the periods indicated, by segment and the change from the prior year:

	Three months ended June 30,
	2021		2020		Increase (Decrease) $		Increase (Decrease) %
REVENUES:
Products
Cogeneration	$	1,050,316	$	3,108,022	$	(2,057,706)	(66.2)	%
Chiller	1,089,018		234,772		854,246		363.9	%
Engineered accessories	306,593		443,340		(136,747)		(30.8)	%
Total product revenues	2,445,927		3,786,134		(1,340,207)		(35.4)	%
Services
Maintenance services	3,083,761		2,455,220		628,541		25.6	%
Installation services	244,553		917,363		(672,810)		(73.3)	%
Total service revenues	3,328,314		3,372,583		(44,269)		(1.3)	%
Products and services	5,774,241		7,158,717		(1,384,476)		(19.3)	%
Energy production revenues	370,861		276,341		94,520		34.2	%
Total revenues	$	6,145,102	$	7,435,058	$	(1,289,956)	(17.3)	%

    Total revenues for the three months ended June 30, 2021 were $6,145,102 compared to $7,435,058 for the same period in 2020, a decrease of $1,289,956 or 17.3% year over year.

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    Products and Services

    Product revenues in the three months ended June 30, 2021 were $2,445,927 compared to $3,786,134 for the same period in 2020, a decrease of $1,340,207, or 35.4%.This decrease is due primarily to a decrease in cogeneration sales of $2,057,706 due to decreased unit volume, a decrease in sales of engineered accessories of $136,747, partially offset by an increase in chiller sales of $854,246 due to increased unit volume. Our product sales mix, as well as product revenue, can vary significantly from period to period as our products are high dollar, low volume sales in which revenue is recognized upon shipment and were impacted as energy and other construction projects were delayed due to the COVID-19 pandemic.

    Service revenues in the three months ended June 30, 2021 were $3,328,314, compared to $3,372,583 for the same period in 2020, a decrease of $44,269, or 1.3%. The decrease in the three months ended June 30, 2021 is due primarily to a decrease in installation revenues of $672,810, offset partially by an increase of $628,541, or 25.6%, in service contract revenues. While service contract revenue generally remains relatively constant, installation activity can vary widely depending on the status of various projects. Certain installation projects, particularly those in New York City, continue to experience stoppages due to COVID-19 in the second quarter of 2021 accounting for the decrease in installation revenues.

    Energy Production

    Energy production revenues in the three months ended June 30, 2021 were $370,861, compared to $276,341 for the same period in 2020, an increase of $94,520, or 34.2%. The increase in energy production revenue is a consequence of certain energy production sites that have experienced temporary closures due to the impact of COVID-19 in 2020 that are now returning to operation as government-imposed COVID-19 restrictions are lifted, and to a lesser extent, the revenue recognized from our share of the bi-annual excess cash flows from energy production contracts we sold in the first quarter of 2019. Several of our hotel, athletic and education customer's that have experienced temporary closures and other sites have seen a change to remote work and learning environments have now resumed normal operations resulting in increased energy production revenues in the three months ended June 30, 2021. For sites that have not permanently closed due to COVID-19, energy production revenues at these sites increased 9.3% in the three months ended June 30, 2021 compared to the same period in 2020.

Cost of Sales

    Cost of sales in the three months ended June 30, 2021 was $3,302,464 compared to $4,529,067 for the same period in 2020, a decrease of $1,226,603, or 27.1%. The decrease in cost of sales is due to the reduction of Products and Services revenues and their related cost of sales. During the three months ended June 30, 2021 our gross margin increased to 46.3% compared to 39.1% for the same period in 2020, a 7.2% percentage point increase. The increase in the gross margin percentage is due higher margin on both our cogeneration and chiller products due to higher sales prices and lower warranty costs and an overall change in sales mix to increased higher margin service contract revenue.

    Products and Services

    Cost of sales for products and services in the three months ended June 30, 2021 was $3,070,111 compared to $4,323,191 for the same period in 2020, a decrease of $1,253,080, or 29.0%. During the three months ended June 30, 2021, our products and services gross margin was 46.8% compared to 39.6% for the same period in 2020, a 7.2% percentage point increase. The increase in services gross margin is due primarily to a shift in revenue mix to proportionately higher service maintenance revenues and lower installation activities in the three months ended June 30, 2021 compared to the same period in 2020.

    Energy Production     

    Cost of sales for energy production in the three months ended June 30, 2021 was $232,353 compared to $205,876 for the same period in 2020, a decrease of $26,477, or 12.9%. During the three months ended June 30, 2021 our energy production gross margin increased to 37.4% compared to 25.5% for the same period in 2020, a 11.9% percentage point increase. The increase in the energy production gross margin is due to increased runtime at our energy production sites in the three months ended June 30, 2021 compared to the same period in 2020 and the revenue recognized from our share of the bi-annual excess cash flows from energy production contracts we sold in the first quarter of 2019.

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Operating Expenses

Operating expenses decreased $253,683, or 7.4%, to $3,152,206 in the three months ended June 30, 2021 compared to $3,405,889 in the same period in 2020.

	Three Months Ended
Operating Expenses	June 30, 2021		June 30, 2020		Increase (Decrease) $		Increase (Decrease) %
General and administrative	$	2,438,452	$	2,637,479	$	(199,027)	(7.5)	%
Selling	580,871		602,383		(21,512)		(3.6)	%
Research and development	132,883		166,027		(33,144)		(20.0)	%
Total	$	3,152,206	$	3,405,889	$	(253,683)	(7.4)	%

    General and administrative expenses consist of executive staff, accounting and legal expenses, office space, general insurance and other administrative expenses. General and administrative expenses for the three months ended June 30, 2021 were $2,438,452 compared to $2,637,479 for the same period in 2020, a decrease of $199,027 or 7.5%. General and administrative expenses decreased due to management's continued efforts to control overhead costs, resulting in a $117,822 decrease in payroll and payroll related costs, a $60,400 decrease in franchise taxes and a $34,898 decrease in legal fees, partially offset by a $20,196 increase in business insurance expense.

    Selling expenses consist of sales staff, commissions, marketing, travel and other selling related expenses. Selling expenses for the three months ended June 30, 2021 were $580,871 compared to $602,383 for the same period in 2020, a decrease of $21,512 or 3.6%. The decrease is due to lower sales commissions which decreased $3,533 due to lower product sales and decreased royalty expense which decreased $15,020 due to decreased InVerde cogeneration sales.

    Research and development expenses consist of engineering and technical staff, materials, outside consulting and other related expenses. Research and development expenses for the three months ended June 30, 2021 were $132,883 compared to $166,027 for the same period in 2020, a decrease of $33,144 or 20.0%, as certain R&D projects were curtailed or stopped entirely as a consequence of COVID-19. There has been no change in our focus regarding research and development activities.

Loss from Operations

    Our loss from operations for the three months ended June 30, 2021 was $309,568 compared to a loss of $499,898 for the same period in 2020, a decrease of $190,330. The decrease in our loss from operations is due primarily to the $253,683 decrease in operating expenses and improved gross margins for both our Products and Services Segment and our Energy Production Segment.

Other Income (Expense), net

    Other income, net for the three months ended June 30, 2021 was $725,804 compared to other expense, net of $134,738 for the same period in 2020, an increase of $860,542. The increase in other income in the three months ended June 30, 2021 is due primarily to recognition of the Employee Retention Credit of $713,268 for the first and second calendar quarters of 2021, a $51,165 decrease in interest expense and an increase in the unrealized gain on investment securities of $97,472 compared to the same period in 2020. The reduction in interest expense is due to the May 2020 termination of our Credit Agreement with Webster Business Credit Corporation. See Note 11. "Revolving Line of Credit and Notes Payable" to our unaudited condensed consolidated financial statements for the period ended June 30, 2021.

Provision for State Income Taxes

    The provision for state income taxes for the three months ended June 30, 2021 and 2020 was $7,933 and $13,171, respectively and represents estimated income tax payments, net of refunds to various states.

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Non-controlling Interest

    Income attributable to the non-controlling interest was $8,672 for the three months ended June 30, 2021 which represents the non-controlling interest portion of American DG Energy's 51% owned subsidiary, American DG New York, LLC. For the same period in 2020, income attributable to the non-controlling interest was $6,081.

Net Income (Loss) Attributable to Tecogen Inc

    The net income (loss) attributable to Tecogen for the three months ended June 30, 2021 was net income of $399,631 compared to a net loss of $653,888 for the same period in 2020, an improvement of $1,053,519, or 161.1%.The improvement is due primarily to the recognition of the Employee Retention Credit, lower operating expenses and improved gross margins.

Net Income (Loss) per Share

The net income (loss) per share, basic and diluted, for the three months ended June 30, 2021 was net income per share of $0.02 compared to net loss per share of $0.03 for the same period in 2020. Weighted average shares outstanding used to calculate basic and diluted earnings per share for the three months ended June 30, 2021 were 24,850,261 and 25,125,210 shares, respectively, and for the same period in 2020 were 24,850,261 and 24,850,261 shares, respectively.

Six Months Ended June 30, 2021 compared to the Six Months Ended June 30, 2020

The following table sets forth for the periods indicated, the percentage of net sales represented by certain items reflected in our condensed consolidated statements of operations:

	Six Months Ended
	June 30, 2021	June 30, 2020
Revenues	100.0%	100.0%
Cost of sales	52.5%	63.0%
Gross profit	47.5%	37.0%
Operating expenses
General and administrative	40.1%	34.6%
Selling	8.9%	9.5%
Research and development	2.1%	3.4%
Total operating expenses	51.2%	47.5%
Loss from operations	(3.7)%	(10.5)%
Total other income (expense), net	21.7%	(1.3)%
Consolidated net income (loss)	17.9%	(11.9)%
Income attributable to the non-controlling interest	(0.2)%	(0.1)%
Net income (loss) attributable to Tecogen, Inc.	17.8%	(12.1)%

Revenues

The following table presents revenue for the periods indicated, by segment and the change from the prior year:

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	Six Months Ended June 30,
	2021		2020		Increase (Decrease) $		Increase (Decrease) %
REVENUES:
Products
Cogeneration	$	1,096,961	$	6,344,482	$	(5,247,521)	(82.7)	%
Chiller	2,546,311		(251,209)		2,797,520		1,113.6	%
Engineered accessories	925,377		744,621		180,756		24.3	%
Total product revenues	4,568,649		6,837,894		(2,269,245)		(33.2)	%
Services
Maintenance services	5,847,209		4,921,168		926,041		18.8	%
Installation services	762,249		2,611,505		(1,849,256)		(70.8)	%
Total service revenues	6,609,458		7,532,673		(923,215)		(12.3)	%
Products and services	11,178,107		14,370,567		(3,192,460)		(22.2)	%
Energy production revenues	1,024,156		1,027,191		(3,035)		(0.3)	%
Total revenues	$	12,202,263	$	15,397,758	$	(3,195,495)	(20.8)	%

    Total revenues for the six months ended June 30, 2021 were $12,202,263 compared to $15,397,758 for the same period in 2020, a decrease of $3,195,495 or 20.8% year over year primarily due to a $3,192,460 decrease in Products and Services revenue due to decreased cogeneration sales and installation revenue.

    Products and Services

    Product revenues in the six months ended June 30, 2021 were $4,568,649 compared to $6,837,894 for the same period in 2020, a decrease of $2,269,245, or 33.2%.This decrease is due primarily to a decrease in cogeneration sales of $5,247,521 due to decreased unit volume, partially offset by an increase in chiller sales of $2,797,520 due to increased unit volume and increased sales of engineered accessories of $180,756. Chiller sales in the first quarter of 2020 were negatively impacted by the return of chiller products of approximately $655,000. Our product sales mix, as well as product revenue, can vary significantly from period to period as our products are high dollar, low volume sales in which revenue is recognized upon shipment and were negatively impacted as energy and other construction projects were delayed due to the COVID-19 pandemic.

    Service revenues in the six months ended June 30, 2021 were $6,609,458, compared to $7,532,673 for the same period in 2020, a decrease of $923,215, or 12.3%. The decrease in the six months ended June 30, 2021 is due primarily to a decrease in installation revenues of $1,849,256, offset partially by an increase of $926,041, or 18.8%, in service contract revenues. While service contract revenue generally remains relatively constant, installation activity can vary widely depending on the status of various projects. Certain installation projects, particularly those in New York City, continue to experience stoppages due to COVID-19 in the first six months of 2021 accounting for the decrease in installation revenues.

    Energy Production

    Energy production revenues in the six months ended June 30, 2021 were $1,024,156, compared to $1,027,191 for the same period in 2020, a decrease of $3,035, or 0.3%. The decrease in energy production revenue is a consequence of certain energy production sites that have either closed permanently or have experienced temporary closures due to the impact of COVID-19, partially offset by the revenue recognized from our share of the bi-annual excess cash flows from energy production contracts we sold in the first quarter of 2019. Several of our hotel, athletic and education customers have experienced temporary closures and other sites have seen a change to remote work and learning environments, resulting in decreased energy production revenues. Energy production revenue at sites permanently closed due to COVID-19 represented 2.9% of energy production revenue during the six months ended June 30, 2021. For sites that have not permanently closed due to COVID-19, energy production revenues at these sites increased 0.2% in the six months ended June 30, 2021 compared to the same period in 2020 as government-imposed COVID-19 restrictions are lifted.

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Cost of Sales

    Cost of sales in the six months ended June 30, 2021 was $6,408,417 compared to $9,699,600 for the same period in 2020, a decrease of $3,291,183, or 33.9%. The decrease in cost of sales is due to the reduction of Products and Services revenues and their related cost of sales. During the six months ended June 30, 2021 our gross margin increased to 47.5% compared to 37.0% for the same period in 2020, a 10.5% percentage point increase. The increase in the gross margin percentage is due higher margin on both our cogeneration and chiller products due to higher sales prices and lower warranty costs and an overall change in sales mix to increased higher margin service contract revenue.

    Products and Services

    Cost of sales for products and services in the six months ended June 30, 2021 was $5,782,002 compared to $9,009,320 for the same period in 2020, a decrease of $3,227,318, or 35.8%. During the first six months of 2021, our products and services gross margin was 48.3% compared to 37.3% for the same period in 2020, a 11.0% percentage point increase. The increase in services gross margin is due primarily to a shift in revenue mix to proportionately higher service maintenance revenues and lower installation activities in the six months ended June 30, 2021 compared to the same period in 2020.

    Energy Production     

    Cost of sales for energy production in the six months ended June 30, 2021 was $626,415 compared to $690,280 for the same period in 2020, a decrease of $63,865, or 9.3%. During the first six months of 2021 our energy production gross margin increased to 38.9% compared to 32.8% for the same period in 2020, a 6.1% percentage point increase. The increase in the energy production gross margin is due to improved site operational efficiency, decreased contract maintenance costs and the reduced cost of natural gas and decreased therms used in the six months ended June 30, 2021 compared to the same period in 2020 and the revenue from our share of the bi-annual excess cash flows from energy production contracts we sold in the first quarter of 2019.

Operating Expenses

Operating expenses decreased $1,073,062, or 14.7%, to $6,242,412 in the six months ended June 30, 2021 compared to $7,315,474 in the same period in 2020.

	Six Months Ended
Operating Expenses	June 30, 2021		June 30, 2020		Increase (Decrease) $		Increase (Decrease) %
General and administrative	$	4,892,305	$	5,326,941	$	(434,636)	(8.2)	%
Selling	1,091,074		1,458,170		(367,096)		(25.2)	%
Research and development	259,033		530,363		(271,330)		(51.2)	%
Total	$	6,242,412	$	7,315,474	$	(1,073,062)	(14.7)	%

    General and administrative expenses consist of executive staff, accounting and legal expenses, office space, general insurance and other administrative expenses. General and administrative expenses for the six months ended June 30, 2021 were $4,892,305 compared to $5,326,941 for the same period in 2020, a decrease of $434,636 or 8.2%. General and administrative expenses decreased due to management's continued efforts to control overhead costs, resulting in a $361,047 decrease in payroll and payroll related costs, a $161,502 decrease in legal fees due to a reduction in abandoned patent application write-downs which decreased to $7,400 in the six months ended June 30, 2021 compared to $179,944 in six months ended June 30, 2020, and a $93,944 decrease in franchise taxes, partially offset by a $62,041 increase in audit and consulting fees, a $42,013 increase in depreciation and amortization expense and a $41,231 increase in business insurance expense.

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    Selling expenses consist of sales staff, commissions, marketing, travel and other selling related expenses. Selling expenses for the six months ended June 30, 2021 were $1,091,074 compared to $1,458,170 for the same period in 2020, a decrease of $367,096 or 25.2%. The decrease is due to lower sales commissions which decreased $255,456 due to lower product sales, a $37,283 decrease in royalty expense due to decreased InVerde cogeneration sales and decreased travel and related expenses which decreased $15,252 due to COVID-19 travel curtailment.

    Research and development expenses consist of engineering and technical staff, materials, outside consulting and other related expenses. Research and development expenses for the six months ended June 30, 2021 were $259,033 compared to $530,363 for the same period in 2020, a decrease of $271,330 or 51.2%, as certain R&D projects were curtailed or stopped entirely as a consequence of COVID-19. There has been no change in our focus regarding research and development activities.

Loss from Operations

    Our loss from operations for the six months ended June 30, 2021 was $448,566 compared to a loss of $1,617,316 for the same period in 2020, a decrease of $1,168,750. The decrease in our loss from operations is due primarily to the $1,073,062 decrease in operating expenses and improved gross margins for both our Products and Services Segment and our Energy Production Segment.

Other Income (Expense), net

    Other income, net for the six months ended June 30, 2021 was $2,651,363 compared to other expense, net of $202,677 for the same period in 2020, an increase of $2,854,040. The increase in other income in the six months ended June 30, 2021 is due primarily to the gain on extinguishment of debt of $1,887,859 as a result of the Paycheck Protection Program Loan forgiveness, recognition of the Employee Retention Credit of $713,268 for the first and second calendar quarters of 2021, and to a lesser extent, a $106,510 decrease in interest expense and an increase in the unrealized gain on investment securities of $154,650. The reduction in interest expense is due to the May 2020 termination of our Credit Agreement with Webster Business Credit Corporation. See Note 11. "Revolving Line of Credit and Notes Payable" to our unaudited condensed consolidated financial statements for the period ended June 30, 2021.

Provision for State Income Taxes

    The provision for state income taxes for the six months ended June 30, 2021 and 2020 was $15,991 and $18,393, respectively and represents estimated income tax payments, net of refunds to various states.

Non-controlling Interest

    Income attributable to the non-controlling interest was $20,468 for the six months ended June 30, 2021 which represents the non-controlling interest portion of American DG Energy's 51% owned subsidiary, American DG New York, LLC. For the same period in 2020, income attributable to the non-controlling interest was $17,889.

Net Income (Loss) Attributable to Tecogen Inc

    The net income (loss) attributable to Tecogen for the six months ended June 30, 2021 was net income of $2,166,338 compared to a net loss of $1,856,275 for the same period in 2020, an improvement of $4,022,613, or 216.7%. The improvement is due primarily to the extinguishment of debt, recognition of the Employee Retention Credit, lower operating expenses and improved gross margins.

Net Income (Loss) per Share

The net income (loss) per share, basic and diluted, for the six months ended June 30, 2021 was net income per share of $0.09 compared to net loss per share of $0.07 for the same period in 2020. Weighted average shares outstanding used to calculate basic and diluted earnings per share for the six months ended June 30, 2021 were 24,850,261 and 25,102,470 shares, respectively, and for the same period in 2020 were 24,850,256 and 24,850,256 shares, respectively.

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Liquidity and Capital Resources

The following table presents a summary of our net cash flows from operating, investing and financing activities:

	Six Months Ended
Cash Provided by (Used in)	June 30, 2021		June 30, 2020		Increase (Decrease)
Operating activities	$	(103,649)	$	2,760,806	$	(2,864,455)
Investing activities	(75,361)		(200,800)		125,439
Financing activities	1,874,269		(577,759)		2,452,028
Change in cash and cash equivalents	$	1,695,259	$	1,982,247	$	(286,988)

Consolidated working capital at June 30, 2021 was $16,752,415 compared to $13,379,263 at December 31, 2020, an increase of $3,373,152, or 20.4%. Included in working capital were cash and cash equivalents of $3,185,478 at June 30, 2021, compared to $1,490,219 at December 31, 2020, an increase of $1,695,259, or 113.8%. The increase in working capital was the result of the receipt in February 2021 of a Second Draw Paycheck Protection Program loan in the amount of $1,874,269 and the forgiveness of the initial Paycheck Protection Program loan during the six months ended June 30, 2021.

Cash Flows from Operating Activities

Cash used in operating activities for the six months ended June 30, 2021 was $103,649 compared to $2,760,806 of cash provided by operating activities for the same period in 2020 a decrease of $2,864,455, or 103.8% Our accounts receivable and unbilled revenue balances decreased to $7,777,064 and $3,899,499, respectively, at June 30, 2021 compared to $8,671,163 and $4,267,249 at December 31, 2020, providing $894,100 and $367,750 of cash due to timing of billing, shipments, and collections due in part to payment delays from certain of our customers due to COVID-19. In addition, our inventory decreased $357,072 in the six months ended June 30, 2021 due to management's decision to reduce inventories.

Accounts payable decreased to $2,597,737 as of June 30, 2021 from $4,183,105 at December 31, 2020, using $1,585,368 in cash flow from operations. The decrease in accounts payable was due to reduced operating expenses and lower inventory procurement. Deferred revenue decreased as of June 30, 2021 compared to December 31, 2020, using $45,118 of cash from operations. We expect accounts payable and deferred revenue to fluctuate with routine changes in operations.

Cash Flows from Investing Activities

During the six months ended June 30, 2021 our investing activities used $75,361 in cash for the purchases of property, plant and equipment of $47,504, and purchases of intangible assets of $5,682, along with distributions to the 49% non-controlling interest holders of American DG New York LLC of $33,812, partially offset by the receipt of $11,637 in proceeds from the sale of investment securities. For the six months ended June 30, 2020 cash used in investing activities was $200,800. The decrease in cash used by investing activities in the six months ended June 30, 2020 is due to a $6,170 decrease in purchases of property, plant and equipment, a $117,572 decrease in investment in intangible assets and a $10,742 decrease in distributions to the non-controlling interest holders of American DG New York LLC.

Cash Flows from Financing Activities

During the six months ended June 30, 2021 our financing activities provided $1,874,269 compared to the use of cash of $577,759 for the same period in 2020. Our financing activities during the six months ended June 30, 2021 consisted solely of our receipt of $1,874,269 under the Paycheck Protection Program Second Draw loan. Financing activities for the six months ended June 30, 2020 included net payments on the line of credit of $2,453,159, proceeds of $1,874,200 received under the Paycheck Protection Program as well as proceeds from the exercise of stock options of $1,200.

28

TECOGEN INC.

Backlog

As of June 30, 2021, our backlog of product and installation projects, excluding service contracts, was $8.8 million, consisting of $5.0 million of purchase orders received by us and $3.8 million of projects in which the customer's internal approval process is complete, financial resources have been allocated and the customer has made a firm verbal commitment that the order is in the process of execution. Backlog at the beginning of any period is not necessarily indicative of future performance. Our presentation of backlog may differ from other companies in our industry.

Paycheck Protection Program Loans and Employee Retention Credit

On January 19, 2021, we received a letter dated January 12, 2021 from Webster Bank, NA confirming that the Paycheck Protection Program Loan to us pursuant to the Coronavirus Aid, Relief, and Economic Recovery Act, as amended ("CARES Act"), in the original principal amount of $1,874,200, together with accrued interest of $13,659, was forgiven in full as of January 11, 2021. The loan forgiveness of $1,887,859 was accounted for as debt extinguishment and is reported as a separate component of other income in the condensed consolidated statements of earnings for the six months ended June 30, 2021.

On February 5, 2021, we obtained a Paycheck Protection Program Second Draw unsecured loan through Webster Bank, N.A. in the amount of $1,874,269 pursuant to the CARES Act. The loan is guaranteed by the SBA. Interest on the loan balance is at the rate of 1% per year, and repayment of the loan balance is deferred until June 5, 2022. If not forgiven in accordance with the CARES Act, the loan is repayable in forty-four (44) monthly installments of $43,400 beginning July 5, 2022 with final payment due on February 5, 2026. The loan may be prepaid at any time without penalty. The loan agreement and promissory note include customary provisions for a loan of this type, including prohibitions on our payment of dividends or repurchase of shares of our common stock while the loan remains outstanding. The loan agreement and promissory note defines events of default to include, among other things, payment defaults, breaches of provisions of the loan agreement or the promissory note and cross-defaults on other loans, if applicable.

We anticipate that 100% of the loan proceeds will be used for covered expenses, payroll, rent, and utilities (which are costs expected to be eligible for loan forgiveness under the CARES Act and the Promissory Note) during the 24 week Covered Period following the disbursement of the loan as permitted under the PPP Flexibility Act in order to maximize the amount forgivable under the loan. We intend to submit a loan forgiveness application before the end of September 2021. There can be no assurance our application for forgiveness will be granted and in what amount. Such forgiveness is subject to an application to, and approval by, the SBA and may also be subject to further requirements in any regulations and guidelines the SBA may adopt. To the extent that there is a loan balance after the application of permissible forgiveness, we may seek to extend the loan maturity for the remaining balance to the maximum maturity of five years as permitted under the CARES Act as amended by the PPP Flexibility Act.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was signed into law providing numerous tax provisions and other stimulus measures, including an employee retention credit (“ERC”), which is a refundable tax credit against certain employment taxes. The Taxpayer Certainty and Disaster Tax Relief Act of 2020 and the American Rescue Plan Act of 2021 extended and expanded the availability of the ERC. The ERC is available through December 31, 2021 and is equal to 70% of qualified wages (which includes employer qualified health plan expenses) paid to employees. During each quarter in 2021, a maximum of $10,000 in qualified wages for each employee is eligible for the ERC. Therefore, the maximum tax credit that can be claimed by an eligible employer in 2021 is $7,000 per employee per calendar quarter. Section 2301(c)(2)(B) of the CARES Act permits an employer to use an alternative quarter to calculate gross receipts and the employer may determine if the decline in gross receipt test is met for a calendar quarter in 2021 by comparing its gross receipts for the immediately preceding calendar quarter with those for the corresponding calendar quarter in 2019. Accordingly, for the first quarter of 2021, we elected to use our gross receipts for the fourth calendar quarter of 2020 compared to our gross receipts for the fourth calendar quarter of 2019. As a result of our election to use an alternative quarter, we qualified for the ERC in the first and second quarters of 2021 because our gross receipts decreased by more than 20% from the first and second quarters of 2019. As a result of averaging 100 or fewer full-time employees in 2019, all wages paid to our employees were eligible for the ERC (rather than just wages paid to employees not providing services). During the six months ended June 30, 2021, we recorded an aggregate ERC benefit for the first and second quarters of 2021 in the amount of $713,268 in other income (expense), net in our condensed consolidated statements of operations.

29

TECOGEN INC.

Liquidity

At June 30, 2021, we had cash and cash equivalents of $3,185,478, an increase of $1,695,259 or 113.8% from the cash and cash equivalents balance at December 31, 2020. During the six months ended June 30, 2021, our revenues continued to be negatively impacted due to COVID-19, resulting in customer order delays or deferrals; service delays due to customer facility closures, in some cases for extended periods, and a reduction in our energy production revenues due to business closures and increased remote work and learning environments. The extent to which the coronavirus will continue to impact our business, our financial results, and our cash flows will depend on future developments which are highly uncertain and cannot be predicted.

Based on our current operating plan, we believe existing resources, including cash and cash flows from operations, together with the $1,874,269 of proceeds from our Second Draw Paycheck Protection Program loan and current and anticipated Employee Retention Credit will be sufficient to meet our working capital requirements for the next twelve months. The funds made available to us through the Paycheck Protection Program have provided liquidity for our business, and there can be no assurance that additional financing on such favorable terms will be available to us in the future. We will need to generate sufficient cash from operations to finance the company during the periods beyond twelve months in the future. If sufficient funds from operating activities are not available to finance our business, we may need to raise additional capital through debt financing or an equity offering to meet our operating and capital needs.

Significant Accounting Policies and Critical Estimates

Our significant accounting policies are discussed in the Notes to our Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2020. The accounting policies and estimates that can have a significant impact upon our operating results, financial position and footnote disclosures are described in the above notes and in the Annual Report.

Significant New Accounting Standards or Updates Not Yet Effective    

    The Company's critical accounting policies have remained consistent as discussed in our Annual Report on

Form 10-K for the year ended December 31, 2020, filed with the SEC on March 18, 2021.

    See Note 1, Description of Business and Basis of Presentation, to the Condensed Consolidated Financial Statements included elsewhere in this Quarterly Report on Form 10-Q.

Seasonality

We expect that the majority of our heating systems sold will be operational for the winter and the majority of our chilling systems sold will be operational for the summer. Our cogeneration sales are not generally affected by seasonality. Our service team experiences higher demand in the warmer months when cooling is required. Chiller units are generally shut down in the winter and started up again in the spring. The chiller "busy season' for the service team generally runs from May through the end of September.

Off-Balance Sheet Arrangements

Currently, we do not have any material off-balance sheet arrangements, including any outstanding derivative financial instruments, off-balance sheet guarantees, interest rate swap transactions or foreign currency contracts. We do not engage in trading activities involving non-exchange traded contracts.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Not applicable.

30

TECOGEN INC.

Item 4. Controls and Procedures.

Management’s Evaluation of Disclosure Controls and Procedures:

As of the end of the period covered by this Report, our Chief Executive Officer and Chief Financial Officer ("Certifying Officers") conducted evaluations of our disclosure controls and procedures. As defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended ("Securities Exchange Act"), the term "disclosure controls and procedures" means controls and procedures of an issuer that are designed to ensure the information required to be disclosed by the issuer in the reports that it files or submits under the Section 13(a) or 15(d) is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's ("SEC") rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under Section 13(a) or 15(d) of the Securities Exchange Act is accumulated and communicated to the issuer's management, including the Certifying Officers, to allow timely decisions regarding required disclosure.

Our disclosure controls and procedures are designed to provide reasonable assurance that the control system’s objectives will be met. Our management, including our Chief Executive Officer and Chief Accounting Officer, after evaluating the effectiveness of our disclosure controls and procedures as of the end of the period covered by this Report, have concluded that our disclosure controls and procedures were not effective due to a material weakness with respect to a small number of individuals dealing with general controls over information technology. Management will continue to evaluate the above weaknesses and we are taking steps to remediate the weaknesses as resources become available.

Changes in Internal Control over Financial Reporting:

There were no changes in our internal controls over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act) during the period covered by this Report that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting. However, we are continuing the process of implementing a new computer system to remediate our material weaknesses with respect to the small number of individuals dealing with general controls over information technology. Management had the system partially implemented as of year end 2020 and continues to work on its implementation, however, due to certain changes in our accounting personnel, the completion of the implementation has been delayed.

On June 15, 2021, we appointed Mr. Abinand Rangesh as our Chief Financial Officer. Mr. Rangesh replaces Mr. Roger Deschenes as our Principal Financial Officer. Mr. Deschenes continues to serve as our Chief Accounting Officer and Treasurer.

PART II - OTHER INFORMATION

Item 1. Legal Proceedings

As of the date of the filing of this Report, we are not a party to any material pending legal proceedings and know of no contemplated governmental proceeding involving us. However, from time to time, we may be involved in ordinary routine litigation incidental to our business.

Item 1A. Risk Factors    

    In addition to the other information set forth in this report, you should carefully consider the factors discussed under "Item1A - Risk Factors” in our Annual Report on Form 10-K for our fiscal year ended December 31, 2020 ("2020 Form 10-K") The risks discussed in our 2020 Form 10-K could materially affect our business, financial condition and future results. The risks described in our 2020 Form 10-K are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition or operating results.

Item 2. Unregistered Sales of equity Securities and Use of Proceeds

None.

Item 3. Defaults in Senior Securities

None.

Item 4. Mine Safety Disclosures

31

TECOGEN INC.

Not applicable.

Item 5. Other Information    

None.

32

TECOGEN INC.

Item 6. Exhibits

Exhibit No.	Description of Exhibit
31.1*	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1**	Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS**	XBRL Instance Document
101.SCH**	XBRL Taxonomy Extension Schema
100.CAL**	XBRL Taxonomy Extension Calculation Linkbase
100.DEF**	XBRL Taxonomy Extension Definition Linkbase
101.LAB**	XBRL Taxonomy Extension Label Linkbase
101.PRE**	XBRL Taxonomy Extension Presentation Linkbase

____________________________________________

*    Filed herewith

**    Furnished herewith

+    Compensatory plan or arrangement

33

TECOGEN INC.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned.

	TECOGEN INC.
	(Registrant)
Dated: August 12, 2021	By:	/s/ Benjamin M. Locke
	Benjamin M. Locke
	Chief Executive Officer
	(Principal Executive Officer)
Dated: August 12, 2021	By:	/s/ Abinand Rangesh
	Abinand Rangesh
	Chief Financial Officer
	(Principal Financial Officer)

34

EX-31.1

EXHIBIT 31.1

TECOGEN INC.

CERTIFICATION REQUIRED BY EXCHANGE ACT RULES 13a-14(a) and 15d-14(a),

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Benjamin M. Locke, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Tecogen Inc.;

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

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

4.The registrant’s other certifying officer(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.

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 12, 2021

/s/ Benjamin M. Locke

Benjamin M. Locke

Chief Executive Officer

EX-31.2

EXHIBIT 31.2

TECOGEN INC.

CERTIFICATION REQUIRED BY EXCHANGE ACT RULES 13a-14(a) and 15d-14(a),

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Abinand Rangesh, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Tecogen Inc.;

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

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

4.The registrant’s other certifying officer(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.

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 12, 2021

/s/ Abinand Rangesh

Abinand Rangesh

Chief Financial Officer

EX-32.1

EXHIBIT 32.1

TECOGEN INC.

CERTIFICATION REQUIRED BY EXCHANGE ACT RULES 13a-14(b) and 15d-14(b),

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

    Each of, Benjamin M. Locke, Chief Executive Officer, and Abinand Rangesh, Chief Financial Officer, of Tecogen Inc., or the Company, certify, pursuant to Section 1350, Chapter 63 of Title 18, United States Code that, to his knowledge:

1.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) of the Securities Exchange Act of 1934 (15 U.S.C. 78 m or 78o(d)); and

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

Date: August 12, 2021

/s/ Benjamin M. Locke

Benjamin M. Locke

Chief Executive Officer

/s/ Abinand Rangesh

Abinand Rangesh

Chief Financial Officer

XML

Cover - shares	6 Months Ended
	Jun. 30, 2021	Aug. 03, 2021
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-36103
Entity Registrant Name	TECOGEN INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3536131
Entity Address, Address Line One	45 First Avenue
Entity Address, City or Town	Waltham
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02451
City Area Code	781
Local Phone Number	466-6402
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,850,261
Entity Central Index Key	0001537435
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

XML

Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 3,185,478	$ 1,490,219
Accounts receivable, net	7,777,064	8,671,163
Unbilled revenue	3,899,499	4,267,249
Employee retention credit	713,268	0
Inventories, net	6,811,525	7,168,596
Prepaid and other current assets	839,732	597,144
Total current assets	23,226,566	22,194,371
Property, plant and equipment, net	2,025,334	2,283,846
Right of use assets	2,168,100	1,632,574
Intangible assets, net	1,244,373	1,360,319
Goodwill	2,406,156	2,406,156
Other assets	248,713	196,387
TOTAL ASSETS	31,319,242	30,073,653
Current liabilities:
Note payable	0	837,861
Accounts payable	2,597,737	4,183,105
Accrued expenses	2,138,931	1,993,471
Deferred revenue	1,119,943	1,294,157
Lease obligations, current	617,540	506,514
Total current liabilities	6,474,151	8,815,108
Long-term liabilities:
Note payable, net of current portion	1,874,269	1,036,339
Deferred revenue, net of current portion	244,425	115,329
Lease obligations, net of current portion	1,642,801	1,222,492
Deferred payroll tax liability, net of current portion	131,224	0
Unfavorable contract liability	1,438,278	1,617,051
Total liabilities	11,805,148	12,806,319
Commitments and contingencies (Note 12)
Tecogen Inc. shareholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 24,850,261 and 24,850,261 issued and outstanding at June 30,2021 and December 31, 2020, respectively	24,850	24,850
Additional paid-in capital	56,908,194	56,814,428
Accumulated deficit	(37,363,283)	(39,529,621)
Total Tecogen Inc. stockholders’ equity	19,569,761	17,309,657
Non-controlling interest	(55,667)	(42,323)
Total stockholders’ equity	19,514,094	17,267,334
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 31,319,242	$ 30,073,653
Common stock, shares outstanding	24,850,261	24,850,261
Common stock, shares issued	24,850,261	24,850,261

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	24,850,261	24,850,261
Common stock, shares outstanding	24,850,261	24,850,261

XML

Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total revenues	$ 6,145,102	$ 7,435,058	$ 12,202,263	$ 15,397,758
Total cost of sales	3,302,464	4,529,067	6,408,417	9,699,600
Gross profit	2,842,638	2,905,991	5,793,846	5,698,158
Operating expenses
General and administrative	2,438,452	2,637,479	4,892,305	5,326,941
Selling	580,871	602,383	1,091,074	1,458,170
Research and development	132,883	166,027	259,033	530,363
Total operating expenses	3,152,206	3,405,889	6,242,412	7,315,474
Loss from operations	(309,568)	(499,898)	(448,566)	(1,617,316)
Other income (expense)
Interest income and other income (expense), net	(1,125)	238	(2,328)	11,965
Interest expense	(5,088)	(56,253)	(9,728)	(116,238)
Gain on extinguishment of debt			1,887,859	0
Employee retention credit	713,268	0	713,268	0
Gain on sale			6,046	0
Unrealized gain (loss) on investment securities	18,749	(78,723)	56,246	(98,404)
Total other income (expense), net	725,804	(134,738)	2,651,363	(202,677)
Income (loss) before provision for state income taxes	416,236	(634,636)	2,202,797	(1,819,993)
Provision for state income taxes	7,933	13,171	15,991	18,393
Consolidated net income (loss)	408,303	(647,807)	2,186,806	(1,838,386)
(Income) loss attributable to the non-controlling interest	(8,672)	(6,081)	(20,468)	(17,889)
Net income (loss) attributable to Tecogen Inc.	$ 399,631	$ (653,888)	$ 2,166,338	$ (1,856,275)
Earnings Per Share [Abstract]
Net income (loss) per share - basic (in USD per share)	$ 0.02	$ (0.03)	$ 0.09	$ (0.07)
Net income (loss) per share - diluted (in usd per share)	$ 0.02	$ (0.03)	$ 0.09	$ (0.07)
Weighted average shares outstanding - basic	24,850,261	24,850,261	24,850,261	24,850,256
Weighted average shares outstanding - diluted	25,125,210	24,850,261	25,102,470	24,850,256
Products
Total revenues	$ 2,445,927	$ 3,786,134	$ 4,568,649	$ 6,837,894
Total cost of sales	1,390,725	2,220,456	2,565,012	4,023,339
Services
Total revenues	3,328,314	3,372,583	6,609,458	7,532,673
Total cost of sales	1,679,386	2,102,735	3,216,989	4,985,981
Energy production
Total revenues	370,861	276,341	1,024,156	1,027,191
Total cost of sales	$ 232,353	$ 205,876	$ 626,416	$ 690,280

XML

Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Noncontrolling Interest
Beginning balance (shares) at Dec. 31, 2019		24,849,261
Beginning balance at Dec. 31, 2019	$ 23,353,277	$ 24,849	$ 56,622,285	$ (33,379,114)	$ 85,257
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	81,730		81,730
Distributions to Noncontrolling interests	(23,070)				(23,070)
Net income (loss)	(1,856,275)			(1,856,275)
Net loss	(17,889)				(17,889)
Net income (loss)	(1,838,386)
Stock issuance costs	(802)		(802)
Exercise of stock options (shares)		1,000
Exercise of stock options	1,200	$ 1	1,199
Ending balance (shares) at Jun. 30, 2020		24,850,261
Ending balance at Jun. 30, 2020	21,573,949	$ 24,850	56,704,412	(35,235,389)	80,076
Beginning balance (shares) at Mar. 31, 2020		24,850,261
Beginning balance at Mar. 31, 2020	22,182,663	$ 24,850	56,665,319	(34,581,501)	73,995
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	39,494		39,494
Net income (loss)	(653,888)			(653,888)
Net loss	(6,081)				(6,081)
Net income (loss)	(647,807)
Stock issuance costs	(401)		(401)
Ending balance (shares) at Jun. 30, 2020		24,850,261
Ending balance at Jun. 30, 2020	21,573,949	$ 24,850	56,704,412	(35,235,389)	80,076
Beginning balance (shares) at Dec. 31, 2020		24,850,261
Beginning balance at Dec. 31, 2020	17,267,334	$ 24,850	56,814,428	(39,529,621)	(42,323)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	93,766		93,766
Distributions to Noncontrolling interests	(33,812)		0		(33,812)
Net income (loss)	2,166,338			2,166,338
Net loss	(20,468)				(20,468)
Net income (loss)	2,186,806
Ending balance (shares) at Jun. 30, 2021		24,850,261
Ending balance at Jun. 30, 2021	19,514,094	$ 24,850	56,908,194	(37,363,283)	(55,667)
Beginning balance (shares) at Mar. 31, 2021		24,850,261
Beginning balance at Mar. 31, 2021	19,066,746	$ 24,850	56,853,513	(37,762,914)	(48,703)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	54,681		54,681
Distributions to Noncontrolling interests	(15,636)				(15,636)
Net income (loss)	399,631			399,631
Net loss	(8,672)				(8,672)
Net income (loss)	408,303
Ending balance (shares) at Jun. 30, 2021		24,850,261
Ending balance at Jun. 30, 2021	$ 19,514,094	$ 24,850	$ 56,908,194	$ (37,363,283)	$ (55,667)

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Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net loss	$ 2,186,806	$ (1,838,386)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization, net	241,470	193,637
Gain on extinguishment of debt	(1,887,859)	0
Employee retention credit	(713,268)	0
Stock-based compensation	93,766	81,730
Gain on sale of investment securities	(6,046)	0
Unrealized (gain) loss on investment securities	(56,246)	98,404
Abandonment of intangible assets	7,400	179,944
Non-cash interest expense	0	50,775
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	894,100	6,405,936
Unbilled revenue	367,750	538,032
Inventory	357,072	(890,868)
Prepaid expenses and other current assets	(242,588)	(6,382)
Other assets	(537,197)	532,293
Increase (decrease) in:
Accounts payable	(1,585,368)	(1,197,576)
Accrued expenses and other current liabilities	290,342	284,506
Deferred revenue	(45,118)	(1,671,239)
Other liabilities	531,335	0
Net cash provided by (used in) operating activities	(103,649)	2,760,806
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(47,504)	(53,674)
Proceeds from the sale of investment securities	11,637	0
Purchases of intangible assets	(5,682)	(123,254)
Payment of stock issuance costs	0	(802)
Distributions to non-controlling interest	(33,812)	(23,070)
Net cash used in investing activities	(75,361)	(200,800)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from note payable	1,874,269	1,874,200
Proceeds (payments) on revolving line of credit, net	0	(2,453,159)
Proceeds from the exercise of stock options	0	1,200
Net cash provided by (used in) financing activities	1,874,269	(577,759)
Change in cash and cash equivalents	1,695,259	1,982,247
Cash and cash equivalents, beginning of the period	1,490,219	877,676
Cash and cash equivalents, end of the period	3,185,478	2,859,923
Non-cash investing and financing activities:
Cash paid for interest	0	36,326
Cash paid for taxes	$ 15,991	$ 5,222

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Description of business and basis of presentation

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Description of business and basis of presentation

Description of Business and Basis of Presentation

Description of Business

Tecogen Inc., or we, our or us, produces commercial and industrial engine-driven, combined heat and power (CHP) products that reduce energy costs, decrease greenhouse gas emissions and alleviate congestion on the national power grid. Our products supply electric power or mechanical power for cooling, while heat from the engine is recovered and purposefully used at a facility. We also install, own, operate and maintain complete energy systems and other complementary systems at customer sites and sell electricity, hot water, heat and cooling energy under long-term contracts at prices guaranteed to the customer to be below conventional utility rates.

The majority of our customers are located in regions with the highest utility rates, typically California, the Midwest and the Northeast.

Our common stock is quoted on OTC Markets Group, Inc.'s OTCQX Best Market tier and trades under the symbol "TGEN."

On May 18, 2017, the Company acquired 100% of the outstanding common stock of American DG Energy Inc., formerly a related entity, in a stock-for-stock merger.

Basis of Presentation

    The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the six months ended June 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021.

    The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

    For further information, refer to the consolidated financial statements and footnotes thereto included in Tecogen's Annual Report on Form 10-K for the year ended December 31, 2020.

    The accompanying unaudited condensed consolidated financial statements include our accounts and the accounts of entities in which we have a controlling financial interest. Those entities include our wholly-owned subsidiaries American DG Energy Inc., Tecogen CHP Solutions, Inc., and a joint venture, American DG New York, LLC, in which American DG Energy Inc. holds a 51% interest. Investments in partnerships and companies in which we do not have a controlling financial interest but where we have significant influence are accounted for under the equity method. Any intercompany transactions have been eliminated in consolidation.

    Our operations are comprised of two business segments. Our Products and Services segment designs, manufactures and sells industrial and commercial cogeneration systems as described above. Our Energy Production segment sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements.

Reclassification

    Certain prior period amounts have been reclassified to conform with current year presentation.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Income Taxes

    The provisions for income taxes in the accompanying unaudited consolidated statements of operations differ from that which would be expected by applying the federal statutory tax rate primarily due to losses for which no benefit is recognized.

Employee Retention Credit

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was signed into law providing numerous tax provisions and other stimulus measures, including an employee retention credit (“ERC”), which is a refundable tax credit against certain employment taxes. The Taxpayer Certainty and Disaster Tax Relief Act of 2020 and the American Rescue Plan Act of 2021 extended and expanded the availability of the ERC.

Section 2301(c)(2)(B) of the CARES Act permits an employer to use an alternative quarter to calculate gross receipts and the employer may determine if the decline in gross receipt tests is met for a calendar quarter in 2021 by comparing its gross receipts for the immediately preceding calendar quarter with those for the corresponding calendar quarter in 2019. Accordingly, for the first quarter of 2021, we elected to use our gross receipts for the fourth calendar quarter of 2020 compared to our gross receipts for the fourth calendar quarter of 2019. As a result of our election to use an alternative quarter, we qualified for the ERC in the first and second quarters of 2021 because our gross receipts decreased by more than 20% from the first and second quarters of 2019. As a result of averaging 100 or fewer full-time employees in 2019, all wages paid to employees in the first and second quarters of 2021 were eligible for the ERC.

Accounting Standards Codification 105, "Generally Accepted Accounting Principles," describes the decision-making framework when no guidance exists in US GAAP for a particular transaction. Specifically, ASC 105-10-05-2 instructs companies to look for guidance for a similar transaction within US GAAP and apply that guidance by analogy. As such, forms of government assistance, such as the ERC, provided to business entities would not be within the scope of ASC 958, but it may be applied by analogy under ASC 105-10-05-2. We accounted for the Employee Retention Credit as a government grant in accordance with Accounting Standards Update 2013-06, Not-for-Profit Entities (Topic 958) ("ASU 2013-06") by analogy under ASC 105-10-05-2. Under this standard, government grants are recognized when the conditions or conditions on which they depend are substantially met. The conditions for recognition of the ERC include, but are not limited to:

•An entity has been adversely affected by the COVID-19 pandemic

•We have not used qualifying payroll for both the Paycheck Protection Program and the ERC

•We incurred payroll costs to retain employees

•The process for filing for the credit is an administrative task and not a barrier to receiving the credits

During the six months ended June 30, 2021, we recorded an ERC benefit of $713,268 in other income (expense), net in the our condensed consolidated statements of operations and as a current receivable in our condensed consolidated balance sheets as of June 30, 2021.

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Revenue

6 Months Ended

Jun. 30, 2021

Revenue Recognition [Abstract]

Revenue

Revenue

Revenue is recognized when performance obligations under the terms of a contract with our customer are satisfied; generally this occurs with the transfer of control of our products, services and energy production. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services or energy to customers.

Shipping and handling fees billed to customers in a sales transaction are recorded in revenue and shipping and handling costs incurred are recorded in cost of sales. We have elected to exclude from revenue any value add sales and other taxes which we collect concurrent with revenue-producing activities. These accounting policy elections are consistent with the manner in which we historically recorded shipping and handling fees and value-added taxes. Incremental costs incurred by us to obtain a contract with a customer are negligible, if any, and are expensed ratably in proportion to the related revenue recognized.

Disaggregated Revenue

In general, our business segmentation is aligned according to the nature and economic characteristics of our products and customer relationships and provides meaningful disaggregation of each business segment's results of operations.

The following table further disaggregates our revenue by major source by segment for the three and six months ended June 30, 2021 and 2020.

Three Months Ended	June 30, 2021
	Products and Services		Energy Production		Total
Products	$	2,445,927	$	—	$	2,445,927
Installation services	244,553		—		244,553
Maintenance services	3,083,761		—		3,083,761
Energy production	—		370,861		370,861
Total revenue	$	5,774,241	$	370,861	$	6,145,102

Six Months Ended	June 30, 2021
	Products and Services		Energy Production		Total
Products	$	4,568,649	$	—	$	4,568,649
Installation services	762,249		—		762,249
Maintenance services	5,847,209		—		5,847,209
Energy production	—		1,024,156		1,024,156
Total revenue	$	11,178,107	$	1,024,156	$	12,202,263

Three Months Ended	June 30, 2020
	Products and Services		Energy Production		Total
Products	$	3,786,134	$	—	$	3,786,134
Installation services	917,363		—		917,363
Maintenance services	2,455,220		—		2,455,220
Energy production	—		276,341		276,341
Total revenue	$	7,158,717	$	276,341	$	7,435,058

Six Months Ended	June 30, 2020
	Products and Services		Energy Production		Total
Products	$	6,837,894	$	—	$	6,837,894
Installation services	2,611,505		—		2,611,505
Maintenance services	4,921,168		—		4,921,168
Energy production	—		1,027,191		1,027,191
Total revenue	$	14,370,567	$	1,027,191	$	15,397,758

Product and Services Segment

Products. Our Product revenues include cogeneration systems that supply electricity and hot water, chillers that provide air-conditioning and hot water and engineered accessories, which consist of ancillary products and parts necessary to install a cogeneration unit including integration into the customers’ existing electrical and mechanical systems. Prior to January 1, 2021, engineered accessories revenue and cost of sales had been reported in our financial statements under Installation Services. Engineered accessories revenue and cost of sales from prior periods have been reclassified to conform with the current year presentation. We refer to the package of engineered accessories and engineering and design services necessary for the customers' installation of a cogeneration unit as light installation services.

We transfer control and generally recognize a sale when we ship a product from our manufacturing facility at which point the customer takes ownership of the product. Payment terms on product sales are generally 30 days.

We recognize revenue in certain circumstances before delivery to the customer has occurred (commonly referred to as bill and hold transactions). We recognize revenue related to such transactions once, among other things, the customer has made a written fixed commitment to purchase the product(s) under normal billing and credit terms, the customer has requested the product(s) be held for future delivery as scheduled and designated by them, risk of ownership has been assumed by the customer, and the product(s) are tagged as sold and segregated for storage awaiting further direction from the customer. Due to the infrequent nature and duration of bill and hold arrangements, the value associated with custodial storage services is deemed immaterial in the context of the contract and in total, and accordingly, none of the transaction price is allocated to such service.

Depending on the product and terms of the arrangement, we may defer the recognition of a portion of the transaction price received because we have to satisfy a future obligation (e.g., product start-up service). Amounts allocated to product start-up services are recognized as revenue when the start-up service has been completed. We use an observable selling price to determine standalone selling prices where available and either a combination of an adjusted market assessment approach, an expected cost plus a margin approach, and/or a residual approach to determine the standalone selling prices for separate performance obligations as a basis for allocating contract consideration when an observable selling price is not available. Amounts received but not recognized pending completion of performance are recognized as contract liabilities and are recorded as deferred revenue along with deposits by customers.

Installation Services. We provide installation services typically including all necessary engineering and design, labor, subcontract labor and service to install a cogeneration unit including integration into the customers’ existing electrical and mechanical systems.

Under complete turnkey installation service contracts revenue is recognized over time using the percentage-of-completion method determined on a cost to cost basis. Our performance obligation under such contracts is satisfied progressively over time as enhancements are made to customer owned and controlled properties. We measure progress towards satisfaction of the performance obligation based on an cost-based input method which we believe appropriately measures and is the most accurate depiction of the transfer of products and services to the customer under these contracts. When the financial metrics of a contract indicate a loss, our policy is to record the entire expected loss as soon as it is known. Contract costs and profit recognized to date under the percentage-of-completion method in excess of billings are recognized as contract assets and are recorded as unbilled revenue. Billings in excess of contract costs and profit are recognized as contract liabilities and are recorded as deferred revenue. Generally billings under complete turnkey installation contracts are made when contractually determined milestones of progress have been achieved, with payment terms generally being 30 days.

Maintenance Services. Maintenance services are provided under either long-term maintenance contracts or time and material maintenance contracts. Revenue under time and material maintenance contracts is recognized when the maintenance service is completed. Revenue under long-term maintenance contracts is recognized either ratably over the term of the contract where the contract price is fixed or when the periodic maintenance activities are completed where the invoiced cost to the customer is based on run hours or kilowatts produced in a given period. We use an output method to measure progress towards completion of our performance obligation which results in the recognition of revenue on the basis of a direct measurement of the value to the customer of the services transferred to date relative to the remaining services promised under the contract. We use the practical expedient at ASC 606-10-55-18 of recognizing revenue in an amount equal to the amount we have the right to invoice the customer under the contract. Payment terms for maintenance services are generally 30 days.

Energy Production Segment

    Energy Production. Revenue from energy contracts is recognized when electricity, heat, hot and/or chilled water is produced by our owned on-site cogeneration systems. Each month we invoice the customer and recognize revenue for the various forms of energy delivered, based on actual meter readings which capture the quantity of the various forms of energy delivered in a given month, under a contractually defined formula which takes into account the current month's cost of energy from the local power utility.

As the various forms of energy delivered by us under energy production contracts are simultaneously delivered and consumed by the customer, our performance obligation under these contracts is considered to be satisfied over time. We use an output method to measure progress towards completion of our performance obligation which results in the recognition of revenue on the basis of a direct measurement of the value to the customer of the services transferred to date relative to the remaining services promised under the contract. We use the practical expedient at ASC 606-10-55-18 of recognizing revenue in an amount equal to the amount that we have the right to invoice the customer under the contract. Payment terms on invoices under these contracts are generally 30 days.

Contract Balances

    The timing of revenue recognition, billings and cash collections result in billed accounts receivable, unbilled revenue (contract assets) and deferred revenue, consisting of customer deposits and billings in excess of revenue recognized (contract liabilities) on the condensed consolidated balance sheets.

    Revenue recognized during the six months ended June 30, 2021 that was included in unbilled revenue at the end of the period was approximately $0.9 million. Approximately $1.3 million was billed in this period that had been recognized as revenue in previous periods.

    Revenue recognized during the six months ended June 30, 2021 that was included in deferred revenue at the beginning of the period was approximately $0.7 million.

Remaining Performance Obligations

Remaining performance obligations related to ASC 606 represent the aggregate transaction price allocated to performance obligations with an original contract term of greater than one year, excluding certain maintenance contracts and all energy production contracts where a direct measurement of the value to the customer is used as a method of measuring progress towards completion of our performance obligation. Exclusion of these remaining performance obligations is due in part to the inability to quantify values based on unknown future levels of delivery and in some cases rates used to invoice customers. Remaining performance obligations therefore consist of unsatisfied or partially satisfied performance obligations related to fixed price maintenance contracts and installation contracts.

As of June 30, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $1.4 million. We expect to recognize revenue of approximately 86.8% of the remaining performance obligations over the next 24 months, 82.1% recognized in the first 12 months and 4.7% recognized over the subsequent 12 months, and the remainder recognized thereafter.

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Income (Loss) Per Common Share

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Income (Loss) Per Common Share

Income (loss) Per Common Share

Basic and diluted income (loss) per share for the three and six months ended June 30, 2021 and 2020, respectively, were as follows: 

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Numerator:
Net income (loss) available to stockholders	$	399,631	$	(653,888)	$	2,166,338	$	(1,856,275)
Denominator:
Weighted average shares outstanding - Basic	24,850,261		24,850,261		24,850,261		24,850,256
Effect of dilutive securities:
Stock options	274,949		—		252,209		—
Weighted average shares outstanding - Diluted	25,125,210		24,850,261		25,102,470		24,850,256
Basic income (loss) per share	$	0.02	$	(0.03)	$	0.09	$	(0.07)
Diluted income (loss) per share	$	0.02	$	(0.03)	$	0.09	$	(0.07)
Anti-dilutive shares underlying stock options outstanding	985,296		1,270,666		777,296		1,269,662

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Inventories, net

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Inventories, net

Inventories, net Inventories at June 30, 2021 and December 31, 2020 consisted of the following:

	June 30, 2021		December 31, 2020
Raw materials	$	6,414,152	$	6,227,591
Less: reserves	(381,000)		(381,000)
Raw materials, net	$	6,033,152	$	5,846,591
Work-in-process	345,228		329,702
Finished goods	433,145		992,303
Total inventories, net	$	6,811,525	$	7,168,596

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Property, Plant and Equipment

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment, net

Property, plant and equipment at June 30, 2021 and December 31, 2020 consisted of the following:

	Estimated Useful Life (in Years)	June 30, 2021		December 31, 2020
Energy systems	1 - 15 years	$	3,556,488	$	3,526,514
Machinery and equipment	5 - 7 years	1,495,528		1,448,024
Furniture and fixtures	5 years	193,698		193,698
Computer software	3 - 5 years	192,865		192,865
Leasehold improvements	*	450,792		450,792
		5,889,371		5,811,893
Less - accumulated depreciation and amortization		(3,864,037)		(3,528,047)
		$	2,025,334	$	2,283,846

* Lesser of estimated useful life of asset or lease term

Depreciation and amortization expense on property and equipment for the three and six months ended June 30, 2021 and 2020 was $145,458 and $306,014 and $176,357 and $352,017, respectively.

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Intangible Assets and Liabilities Other Than Goodwill

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Liabilities Other Than Goodwill

Intangible Assets and Liabilities Other Than Goodwill

As of June 30, 2021 and December 31, 2020 the Company had the following amounts related to intangible assets and liabilities other than goodwill:

	June 30, 2021						December 31, 2020
Intangible assets	Cost		Accumulated Amortization		Total		Cost		Accumulated Amortization		Total
Product certifications	$	726,159	$	(505,542)	$	220,617	$	726,159	$	(478,357)	$	247,802
Patents	853,296		(268,379)		584,917		855,014		(220,764)		634,250
Developed technology	240,000		(132,000)		108,000		240,000		(124,000)		116,000
Trademarks	26,896		—		26,896		26,896		—		26,896
In Process R&D	263,936		(9,426)		254,510		263,936		—		263,936
Favorable contract asset	384,465		(335,032)		49,433		384,465		(313,030)		71,435
	$	2,494,752	$	(1,250,379)	$	1,244,373	$	2,496,470	$	(1,136,151)	$	1,360,319
Intangible liability
Unfavorable contract liability	$	2,534,818	$	(1,096,540)	$	1,438,278	$	2,534,818	$	(917,767)	$	1,617,051

The aggregate amortization expense related to intangible assets and liabilities exclusive of contract related intangibles for the three and six months ended June 30, 2021 and 2020 was $51,187 and $94,077 and $20,312 and $43,128 respectively. The net credit to cost of sales related to the amortization of contract related intangible assets and liabilities for the six months ended June 30, 2021 and 2020 was $79,569 and $158,622 and $95,364 and $203,361, respectively. During the six months

ended June 30, 2021 and 2020, we abandoned certain patent applications amounting to $7,400 and $179,944, respectively, and recorded an abandonment charge in general and administrative expenses in each respective period.

Favorable/Unfavorable Contract Assets and Liabilities

The favorable contract asset and unfavorable contract liability in the foregoing table represent the estimated fair value of American DG Energy's customer contracts (both positive for favorable contracts and negative for unfavorable contracts) which were acquired by us in May 2017.

Amortization of intangibles including contract related amounts is calculated using the straight-line method over the remaining useful life or contract term. Aggregate future amortization over the next five years and thereafter is estimated to be as follows:

Year 1	$	(127,451)
Year 2	(94,816)
Year 3	(52,826)
Year 4	(7,080)
Year 5	60,360
Thereafter	1,012
Total	$	(220,801)

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Sale of Energy Producing Assets and Goodwill Impairment

6 Months Ended

Jun. 30, 2021

Discontinued Operations and Disposal Groups [Abstract]

Sale of Energy Producing Assets and Goodwill Impairment

Sale of Energy Producing Assets and Goodwill ImpairmentDuring the first quarter of 2019 we recognized two individual sales of energy producing assets, for a total of eight power purchase agreements, including the associated energy production contracts for total consideration of $7 million.

    In connection with these assets sales, we entered into agreements with the purchaser to maintain and operate the assets over the remaining periods of the associated energy production contracts (through August 2033 and January 2034, respectively) in exchange for monthly maintenance and operating fees. These agreements contain provisions whereby we have guaranteed to the purchaser a minimum level or threshold of cash flows from the associated energy production contracts. Actual results are compared to the minimum threshold bi-annually and we are contractually obligated to reimburse any shortfall to the purchaser. To the extent actual cash flow results exceed the minimum threshold, we are entitled to fifty percent of such excess under the agreements. As of June 30, 2021, we had a $21,051 receivable representing our share of the excess bi-annual cash flows for the period ended June 30, 2021.

    The foregoing agreements also contain provisions whereby we have agreed to make whole the purchaser in the event the counterparty to the energy production contract(s) defaults on or otherwise terminates before the stated expiration of the energy production contract. Should we be required to make whole the purchaser under such provisions, we would be entitled to seek recovery from the counterparty to the energy production contract(s) under a similar provision contained in those contracts in respect of early termination.

    We are also responsible under the agreements for site decommissioning costs, if any, in excess of certain threshold amounts by site. Decommissioning of site assets is performed when, if and as requested by the counterparty to the energy production contract upon termination of the energy production contract.

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Leases

6 Months Ended

Jun. 30, 2021

Leases [Abstract]

Leases

Leases

    Our leases principally consist of operating leases related to our corporate office, field offices, and our research, manufacturing and storage facilities.

    At inception, we determine if an arrangement contains a lease and whether that lease meets the classification criteria of a finance or operating lease. Some of our lease agreements contain lease components (e.g. minimum rent payments) and non-lease components (e.g. maintenance, labor charges, etc.). We account for each component separately based on the estimated standalone price of each component.

    Operating leases are included in Right-of-use assets, Lease obligations, current and Lease obligations, long term on the condensed consolidated balance sheets. These assets and liabilities are recognized at the commencement date based on the present value of remaining lease payments over the lease term and using an incremental borrowing rate consistent with the lease terms or implicit rates, when readily determinable. For those leases where it is reasonably certain at the commencement date

that we will exercise the option to extend the lease, then the lease term will include the lease extension term. Short-term operating leases, which have an initial term of 12 months or less, are not recorded on the balance sheet.

    Lease expense for operating leases, which principally consist of fixed payments for base rent, is recognized on a straight-line basis over the lease term. Lease expense for the three and six months ended June 30, 2021 and 2020 was $198,943 and $394,216 and $196,103 and $386,138, respectively.

    Supplemental information related to leases for the six months ended June 30, 2021 was as follows:

Cash paid for amounts included in the measurement of operating lease liabilities	$	352,579
Weighted-average remaining lease term - operating leases	4.3 years
Weighted-average discount rate - operating leases	6		%

    Future minimum lease commitments under non-cancellable operating leases as of June 30, 2021 were as follows:

	Operating Leases
Year 1	$	363,163
Year 2	734,110
Year 3	745,417
Year 4	299,424
Year 5	108,799
Thereafter	331,128
Total lease payments	2,582,041
Less: imputed interest	321,700
Total	$	2,260,341

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Stock-Based Compensation

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Stock-Based Compensation

We adopted a 2006 Stock Option and Incentive Plan, or the Plan, under which the Board of Directors may grant incentive or non-qualified stock options and stock grants to key employees, directors, advisors and consultants. The Plan was amended at various dates by the Board of Directors to increase the reserved shares of common stock issuable under the Amended Plan to 3,838,750 as of June 30, 2021, and in June 2017 stockholders approved an amendment to extend the termination date of the Plan to January 1, 2026 and ratified all of our option grants issued after January 1, 2016 (the "Amended Plan").

Stock options vest based upon the terms within the individual option grants, with an acceleration of the unvested portion of such options upon a change in control event, as defined in the Amended Plan. The options are not transferable except by will or domestic relations order. The option price per share under the Amended Plan cannot be less than the fair market value of the underlying shares on the date of the grant. The number of shares remaining available for future issuance under the Amended Plan as of June 30, 2021 was 807,312.

Stock option activity for the six months ended June 30, 2021 was as follows: 

Common Stock Options	Number of Options	Exercise Price Per Share	Weighted Average Exercise Price		Weighted Average Remaining Life	Aggregate Intrinsic Value
Outstanding, December 31, 2020	2,496,242	$0.71-$10.33	$	1.94	7.37 years	$	731,744
Granted	208,000	$1.75	$	1.75
Exercised	—
Canceled and forfeited	(253,500)	$2.60	$	2.60
Outstanding, June 30, 2021	2,450,742	$0.71-$10.33	$	1.86	7.88 years	$	1,709,243
Exercisable, June 30, 2021	666,408		$	4.00		$	27,583
Vested and expected to vest, June 30, 2021	2,183,092		$	1.96		$	1,456,994

Consolidated stock-based compensation expense for the three and six months ended June 30, 2021 and 2020 was $54,681 and $93,766 and $39,494 and $81,730, respectively. No tax benefit was recognized related to the stock-based compensation recorded during the period.

At June 30, 2021 the total compensation cost related to unvested stock option awards not yet recognized is $563,847 and this amount will be recognized over a weighted average period of 2.12 years.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

    The fair value topic of the FASB Accounting Standards Codification defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting guidance also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

 Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. We currently do not have any Level 1 financial assets or liabilities.

 Level 2 - Observable inputs other than quoted prices included in Level 1. Level 2 inputs include quoted prices for identical assets or liabilities in non-active markets, quoted prices for similar assets or liabilities in active markets and inputs other than quoted prices that are observable for substantially the full term of the asset or liability. We have Level 2 financial assets and liabilities as provided below.

 Level 3 - Unobservable inputs reflecting management’s own assumptions about the input used in pricing the asset or liability. We do not currently have any Level 3 financial assets or liabilities.

    The following tables presents the asset reported in "other assets" in the consolidated balance sheet measured at its fair value on a recurring basis as of June 30, 2021 and 2020 by level within the fair value hierarchy.

June 30, 2021			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
Description	Total		Level 1		Level 2		Level 3
Recurring fair value measurements
Marketable equity securities
EuroSite Power Inc.	$	168,739	$	—	$	168,739	$	—
Total recurring fair value measurements	$	168,739	$	—	$	168,739	$	—
June 30, 2020			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
Description	Total		Level 1		Level 2		Level 3
Recurring fair value measurements
Marketable equity securities
EuroSite Power Inc.	$	118,084	$	—	$	118,084	$	—
Total recurring fair value measurements	$	118,084	$	—	$	118,084	$	—

    We utilize a Level 2 category fair value measurement to value its investment in EuroSite Power, Inc. as a marketable equity security at period end. That measurement is equal to the quoted market closing price at period end. Since this security is not actively traded we classify it as Level 2.

    The following table summarizes changes in Level 2 assets which are comprised of marketable equity securities for the six months ended June 30, 2021 and 2020:

Fair value at December 31, 2020	$	118,084
Sale of 93,187 shares	(5,591)
Unrealized gain	56,246
Fair value at June 30, 2021	$	168,739
Fair value at December 31, 2019	$	216,487
Unrealized loss	(98,403)
Fair value at June 30, 2020	$	118,084

During the six months ended June 30, 2021, we received net proceeds of $11,637 from the sale of 93,187 shares of Eurosite Power, Inc. common stock, and recognized a realized gain of $6,046 which is included in other income (expense), net in the condensed consolidated statements of operations.

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Revolving Line of Credit, Bank (Notes)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Revolving Line of Credit and Notes Payable

Revolving Line of Credit and Notes Payable

    On May 4, 2018 we entered into a Credit Agreement with Webster Business Credit Corporation ("Webster") that provided a line of credit of up to $10 million to us on a revolving and secured basis, with availability based on certain accounts receivables, raw materials, and finished goods.

    Borrowings under the Credit Agreement bore interest at a rate equal to, at our option, either (1) One Month LIBOR, plus 3.00%, or (2) Webster’s Base Rate, plus 1.5%. Webster’s Base Rate is defined as the highest of (a) the Federal Funds rate plus 0.5%, (b) Webster’s Prime Rate as adjusted by bank from time to time, and (c) One Month LIBOR, plus 2.75%.

    The Credit Agreement contained certain affirmative and negative covenants applicable to us, which included, among other things, restrictions on our ability to (i) incur additional indebtedness, (ii) make certain investments, (iii) acquire other entities, (iv) dispose of assets and (v) make certain payments including those related to dividends or repurchase of equity. The Credit Agreement also contains financial covenants including maintaining a fixed charge coverage ratio of not less than 1.10:1.00 and we may not make any financed capital expenditures in excess of $500,000 in the aggregate in any fiscal year.

    The $145,011 of costs incurred in connection with the issuance of the revolving credit facility were capitalized and were being amortized to interest expense on a straight-line basis over three years based on the contractual term of the Agreement. For the three and six months ended ended June 30, 2020 we amortized $38,276 and $50,775, respectively, of deferred debt issuance cost.

On May 11, 2020, we terminated our Credit Agreement with Webster, together with several related agreements including, a Revolving Note Security Agreement, Blocked Account Agreement, and Master Letter of Credit Agreement. We paid an early termination fee of $25,000 to terminate the Credit Agreement. As of May 11, 2020, the outstanding balance under the line of credit and accrued and unpaid interest was $0.

On April 17, 2020, we obtained an unsecured loan through Webster Bank, N.A. in the amount of $1,874,200 in connection with the Paycheck Protection Program pursuant to the Coronavirus Aid, Relief, and Economic Security Act, as amended ("CARES Act”) administered by the United States Small Business Administration ("SBA"). The loan was guaranteed by the SBA. Interest on the loan balance was at the rate of 1% per year, and as a result of the enactment of the Paycheck Protection Program Flexibility Act of 2020 (“PPP Flexibility Act”), repayment of the loan balance could be deferred until August 2021, at which time the balance would be payable in 18 monthly installments of $106,356 with the final payment due in January 2023 if not forgiven in accordance with the CARES Act and the terms of the Promissory Note executed by us in connection with the loan. The loan could be prepaid at any time without penalty. The loan agreement and promissory note include customary provisions for a loan of this type, including prohibitions on our payment of dividends or repurchase of shares of our common stock while the loan remains outstanding. The loan agreement and promissory note also defines events of default to include, among other things, payment defaults, breaches of provisions of the loan agreement or the promissory note and cross-defaults on other loans, if applicable.

On January 19, 2021, we received a letter dated January 12, 2021 from Webster Bank, NA confirming that the Paycheck Protection Program Loan issued to us pursuant to the CARES Act, as amended, in the original principal amount of $1,874,200 together with accrued interest of $13,659 was forgiven in full as of January 11, 2021. We have accounted for the loan forgiveness of $1,887,859 as debt extinguishment in accordance with Accounting Standards Update 2020-09, Debt (Topic 470) ("ASU 2020-09") and reported as a separate component of other income (expense), net in the condensed consolidated statements of operations for the six months ended June 30, 2021. The loan forgiveness is expected to be nontaxable for both state and federal purposes and has been treated accordingly in our condensed consolidated financial statements.

On February 5, 2021, we obtained a Paycheck Protection Program Second Draw unsecured loan through Webster Bank, N.A. in the amount of $1,874,269 pursuant to the CARES Act. The loan is guaranteed by the SBA. Interest on the loan balance is at the rate of 1% per year, and repayment of the loan balance is deferred until June 5, 2022. If not forgiven in accordance with the CARES Act, as amended, the loan is repayable in forty-four (44) monthly installments of $43,400 beginning July 5, 2022 with final payment due on February 5, 2026. The loan may be prepaid at any time without penalty. The loan agreement and promissory note include customary provisions for a loan of this type, including prohibitions on our payment of dividends or repurchase of shares of our common stock while the loan remains outstanding. The loan agreement and promissory note defines events of default to include, among other things, payment defaults, breaches of provisions of the loan agreement or the promissory note and cross-defaults on other loans, if applicable.

We anticipate that 100% of the loan proceeds will be used for covered expenses, payroll, rent, and utilities (which are costs expected to be eligible for loan forgiveness under the CARES Act and the Promissory Note) during the 24 week Covered Period following the disbursement of the loan as permitted under the PPP Flexibility Act in order to maximize the amount forgivable under the loan. We intend to submit a loan forgiveness application before the end of September 2021. There can be no assurance our application for forgiveness will be granted and in what amount. Such forgiveness is subject to an application to, and approval by, the SBA and may also be subject to further requirements in any regulations and guidelines the SBA may adopt. To the extent that there is a loan balance after the application of permissible forgiveness, we may seek to extend the loan maturity for the remaining balance to the maximum maturity of five years as permitted under the CARES Act as amended by the PPP Flexibility Act.

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Commitments and contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and Contingencies     We guarantee certain obligations of EuroSite Power Inc, a former subsidiary of American DG Energy Inc. These guarantees include a payment performance guarantee in respect of collateralized equipment financing loans, with a remaining principal amount outstanding subject to the guarantee at June 30, 2021 of approximately $29,013 due ratably in equal installments through September 2021, and certain guarantees of performance in respect of certain customer contracts. Based on current conditions, we do not believe there to be any amounts probable of payment by us under any of the guarantees and have estimated the value associated with the non-contingent aspect of the guarantees is approximately $7,000 which is recorded as a liability in the condensed consolidated balance sheets.

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Segments

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Segments

Segments     As of June 30, 2021, we were organized into two operating segments through which senior management evaluates our business. These segments, as described in more detail in Note 1, are organized around the products and services provided to customers and represent our reportable segments. The following table presents information by reportable segment for the three and six months ended June 30, 2021 and 2020:

	Products and Services		Energy Production		Corporate, other and elimination (1)		Total
Three months ended June 30, 2021
Revenue - external customers	$	5,774,241	$	370,861	$	—	$	6,145,102
Intersegment revenue	56,988		—		(56,988)		—
Total revenue	$	5,831,229	$	370,861	$	(56,988)	$	6,145,102
Gross profit	$	2,704,130	$	138,508	$	—	$	2,842,638
Identifiable assets	$	26,804,525	$	4,514,717	$	—	$	31,319,242
Three months ended June 30, 2020
Revenue - external customers	$	7,158,717	$	276,341	$	—	$	7,435,058
Intersegment revenue	83,050		—		(83,050)		—
Total revenue	$	7,241,767	$	276,341	$	(83,050)	$	7,435,058
Gross profit	$	2,835,526	$	70,465	$	—	$	2,905,991
Identifiable assets	$	20,343,337	$	2,973,048	$	12,557,068	$	35,873,453
Six months ended June 30, 2021
Revenue - external customers	$	11,178,107	$	1,024,156	$	—	$	12,202,263
Intersegment revenue	188,504		—		(188,504)		—
Total revenue	$	11,366,611	$	1,024,156	$	(188,504)	$	12,202,263
Gross profit	$	5,396,105	$	397,741	$	—	$	5,793,846
Identifiable assets	$	26,804,525	$	4,514,717	$	—	$	31,319,242
Six months ended June 30, 2020
Revenue - external customers	$	14,370,567	$	1,027,191	$	—	$	15,397,758
Intersegment revenue	231,710		—		(231,710)		—
Total revenue	$	14,602,277	$	1,027,191	$	(231,710)	$	15,397,758
Gross profit	$	5,361,247	$	336,911	$	—	$	5,698,158
Identifiable assets	$	20,343,337	$	2,973,048	$	12,557,068	$	35,873,453
(1) Corporate, intersegment revenue, other and elimination includes various corporate assets.

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Subsequent Events	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events     We have evaluated subsequent events through the date of this filing and determined that no material subsequent events occurred that would require recognition in the consolidated financial statements or disclosure in the notes thereto.

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Description of business and basis of presentation (Policies)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Principles of Consolidation and Basis of Presentation

Basis of Presentation

    The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the six months ended June 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021.

    The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

    For further information, refer to the consolidated financial statements and footnotes thereto included in Tecogen's Annual Report on Form 10-K for the year ended December 31, 2020.

    The accompanying unaudited condensed consolidated financial statements include our accounts and the accounts of entities in which we have a controlling financial interest. Those entities include our wholly-owned subsidiaries American DG Energy Inc., Tecogen CHP Solutions, Inc., and a joint venture, American DG New York, LLC, in which American DG Energy Inc. holds a 51% interest. Investments in partnerships and companies in which we do not have a controlling financial interest but where we have significant influence are accounted for under the equity method. Any intercompany transactions have been eliminated in consolidation.

    Our operations are comprised of two business segments. Our Products and Services segment designs, manufactures and sells industrial and commercial cogeneration systems as described above. Our Energy Production segment sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements.

Use of Estimates

Use of EstimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates

Income Taxes

Income Taxes

    The provisions for income taxes in the accompanying unaudited consolidated statements of operations differ from that which would be expected by applying the federal statutory tax rate primarily due to losses for which no benefit is recognized.

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Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue Recognition [Abstract]

Disaggregation of Revenue

The following table further disaggregates our revenue by major source by segment for the three and six months ended June 30, 2021 and 2020.

Three Months Ended	June 30, 2021
	Products and Services		Energy Production		Total
Products	$	2,445,927	$	—	$	2,445,927
Installation services	244,553		—		244,553
Maintenance services	3,083,761		—		3,083,761
Energy production	—		370,861		370,861
Total revenue	$	5,774,241	$	370,861	$	6,145,102

Six Months Ended	June 30, 2021
	Products and Services		Energy Production		Total
Products	$	4,568,649	$	—	$	4,568,649
Installation services	762,249		—		762,249
Maintenance services	5,847,209		—		5,847,209
Energy production	—		1,024,156		1,024,156
Total revenue	$	11,178,107	$	1,024,156	$	12,202,263

Three Months Ended	June 30, 2020
	Products and Services		Energy Production		Total
Products	$	3,786,134	$	—	$	3,786,134
Installation services	917,363		—		917,363
Maintenance services	2,455,220		—		2,455,220
Energy production	—		276,341		276,341
Total revenue	$	7,158,717	$	276,341	$	7,435,058

Six Months Ended	June 30, 2020
	Products and Services		Energy Production		Total
Products	$	6,837,894	$	—	$	6,837,894
Installation services	2,611,505		—		2,611,505
Maintenance services	4,921,168		—		4,921,168
Energy production	—		1,027,191		1,027,191
Total revenue	$	14,370,567	$	1,027,191	$	15,397,758

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Loss Per Common Share (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule of Income (Loss) Per Common Share, Basic and Diluted

Basic and diluted income (loss) per share for the three and six months ended June 30, 2021 and 2020, respectively, were as follows: 

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Numerator:
Net income (loss) available to stockholders	$	399,631	$	(653,888)	$	2,166,338	$	(1,856,275)
Denominator:
Weighted average shares outstanding - Basic	24,850,261		24,850,261		24,850,261		24,850,256
Effect of dilutive securities:
Stock options	274,949		—		252,209		—
Weighted average shares outstanding - Diluted	25,125,210		24,850,261		25,102,470		24,850,256
Basic income (loss) per share	$	0.02	$	(0.03)	$	0.09	$	(0.07)
Diluted income (loss) per share	$	0.02	$	(0.03)	$	0.09	$	(0.07)
Anti-dilutive shares underlying stock options outstanding	985,296		1,270,666		777,296		1,269,662

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Inventory (Tables)

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories at June 30, 2021 and December 31, 2020 consisted of the following:

	June 30, 2021		December 31, 2020
Raw materials	$	6,414,152	$	6,227,591
Less: reserves	(381,000)		(381,000)
Raw materials, net	$	6,033,152	$	5,846,591
Work-in-process	345,228		329,702
Finished goods	433,145		992,303
Total inventories, net	$	6,811,525	$	7,168,596

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Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment at June 30, 2021 and December 31, 2020 consisted of the following:

	Estimated Useful Life (in Years)	June 30, 2021		December 31, 2020
Energy systems	1 - 15 years	$	3,556,488	$	3,526,514
Machinery and equipment	5 - 7 years	1,495,528		1,448,024
Furniture and fixtures	5 years	193,698		193,698
Computer software	3 - 5 years	192,865		192,865
Leasehold improvements	*	450,792		450,792
		5,889,371		5,811,893
Less - accumulated depreciation and amortization		(3,864,037)		(3,528,047)
		$	2,025,334	$	2,283,846

* Lesser of estimated useful life of asset or lease term

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Intangible Assets and Liabilities Other Than Goodwill (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

As of June 30, 2021 and December 31, 2020 the Company had the following amounts related to intangible assets and liabilities other than goodwill:

	June 30, 2021						December 31, 2020
Intangible assets	Cost		Accumulated Amortization		Total		Cost		Accumulated Amortization		Total
Product certifications	$	726,159	$	(505,542)	$	220,617	$	726,159	$	(478,357)	$	247,802
Patents	853,296		(268,379)		584,917		855,014		(220,764)		634,250
Developed technology	240,000		(132,000)		108,000		240,000		(124,000)		116,000
Trademarks	26,896		—		26,896		26,896		—		26,896
In Process R&D	263,936		(9,426)		254,510		263,936		—		263,936
Favorable contract asset	384,465		(335,032)		49,433		384,465		(313,030)		71,435
	$	2,494,752	$	(1,250,379)	$	1,244,373	$	2,496,470	$	(1,136,151)	$	1,360,319
Intangible liability
Unfavorable contract liability	$	2,534,818	$	(1,096,540)	$	1,438,278	$	2,534,818	$	(917,767)	$	1,617,051

Schedule of Future Amortization Expense

Aggregate future amortization over the next five years and thereafter is estimated to be as follows:

Year 1	$	(127,451)
Year 2	(94,816)
Year 3	(52,826)
Year 4	(7,080)
Year 5	60,360
Thereafter	1,012
Total	$	(220,801)

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Leases (Tables)

6 Months Ended

Jun. 30, 2021

Leases [Abstract]

Supplemental Information Related to Leases

Supplemental information related to leases for the six months ended June 30, 2021 was as follows:

Cash paid for amounts included in the measurement of operating lease liabilities	$	352,579
Weighted-average remaining lease term - operating leases	4.3 years
Weighted-average discount rate - operating leases	6		%

Future Minimum Lease Commitments

Future minimum lease commitments under non-cancellable operating leases as of June 30, 2021 were as follows:

	Operating Leases
Year 1	$	363,163
Year 2	734,110
Year 3	745,417
Year 4	299,424
Year 5	108,799
Thereafter	331,128
Total lease payments	2,582,041
Less: imputed interest	321,700
Total	$	2,260,341

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Tecogen

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Stock Option Activity

Stock option activity for the six months ended June 30, 2021 was as follows: 

Common Stock Options	Number of Options	Exercise Price Per Share	Weighted Average Exercise Price		Weighted Average Remaining Life	Aggregate Intrinsic Value
Outstanding, December 31, 2020	2,496,242	$0.71-$10.33	$	1.94	7.37 years	$	731,744
Granted	208,000	$1.75	$	1.75
Exercised	—
Canceled and forfeited	(253,500)	$2.60	$	2.60
Outstanding, June 30, 2021	2,450,742	$0.71-$10.33	$	1.86	7.88 years	$	1,709,243
Exercisable, June 30, 2021	666,408		$	4.00		$	27,583
Vested and expected to vest, June 30, 2021	2,183,092		$	1.96		$	1,456,994

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables presents the asset reported in "other assets" in the consolidated balance sheet measured at its fair value on a recurring basis as of June 30, 2021 and 2020 by level within the fair value hierarchy.

June 30, 2021			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
Description	Total		Level 1		Level 2		Level 3
Recurring fair value measurements
Marketable equity securities
EuroSite Power Inc.	$	168,739	$	—	$	168,739	$	—
Total recurring fair value measurements	$	168,739	$	—	$	168,739	$	—
June 30, 2020			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
Description	Total		Level 1		Level 2		Level 3
Recurring fair value measurements
Marketable equity securities
EuroSite Power Inc.	$	118,084	$	—	$	118,084	$	—
Total recurring fair value measurements	$	118,084	$	—	$	118,084	$	—

Schedule of Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings

The following table summarizes changes in Level 2 assets which are comprised of marketable equity securities for the six months ended June 30, 2021 and 2020:

Fair value at December 31, 2020	$	118,084
Sale of 93,187 shares	(5,591)
Unrealized gain	56,246
Fair value at June 30, 2021	$	168,739
Fair value at December 31, 2019	$	216,487
Unrealized loss	(98,403)
Fair value at June 30, 2020	$	118,084

During the six months ended June 30, 2021, we received net proceeds of $11,637 from the sale of 93,187 shares of Eurosite Power, Inc. common stock, and recognized a realized gain of $6,046 which is included in other income (expense), net in the condensed consolidated statements of operations.

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Segments (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The following table presents information by reportable segment for the three and six months ended June 30, 2021 and 2020:

	Products and Services		Energy Production		Corporate, other and elimination (1)		Total
Three months ended June 30, 2021
Revenue - external customers	$	5,774,241	$	370,861	$	—	$	6,145,102
Intersegment revenue	56,988		—		(56,988)		—
Total revenue	$	5,831,229	$	370,861	$	(56,988)	$	6,145,102
Gross profit	$	2,704,130	$	138,508	$	—	$	2,842,638
Identifiable assets	$	26,804,525	$	4,514,717	$	—	$	31,319,242
Three months ended June 30, 2020
Revenue - external customers	$	7,158,717	$	276,341	$	—	$	7,435,058
Intersegment revenue	83,050		—		(83,050)		—
Total revenue	$	7,241,767	$	276,341	$	(83,050)	$	7,435,058
Gross profit	$	2,835,526	$	70,465	$	—	$	2,905,991
Identifiable assets	$	20,343,337	$	2,973,048	$	12,557,068	$	35,873,453
Six months ended June 30, 2021
Revenue - external customers	$	11,178,107	$	1,024,156	$	—	$	12,202,263
Intersegment revenue	188,504		—		(188,504)		—
Total revenue	$	11,366,611	$	1,024,156	$	(188,504)	$	12,202,263
Gross profit	$	5,396,105	$	397,741	$	—	$	5,793,846
Identifiable assets	$	26,804,525	$	4,514,717	$	—	$	31,319,242
Six months ended June 30, 2020
Revenue - external customers	$	14,370,567	$	1,027,191	$	—	$	15,397,758
Intersegment revenue	231,710		—		(231,710)		—
Total revenue	$	14,602,277	$	1,027,191	$	(231,710)	$	15,397,758
Gross profit	$	5,361,247	$	336,911	$	—	$	5,698,158
Identifiable assets	$	20,343,337	$	2,973,048	$	12,557,068	$	35,873,453
(1) Corporate, intersegment revenue, other and elimination includes various corporate assets.

XML

Description of business and basis of presentation - Additional Information (Details)		3 Months Ended			6 Months Ended
	May 18, 2017	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2019 employee
Business Acquisition [Line Items]
Ownerhsip interest in American DG New York, LLC (percent)		51.00%			51.00%
Number of business segments | segment					2
Decrease in gross receipts in quarter (percent)				20.00%
Average number of employees | employee							100
Employee retention credit | $		$ 713,268	$ 0		$ 713,268	$ 0
American DG Energy, Inc.
Business Acquisition [Line Items]
Ownership interest (percent)	100.00%

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Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 6,145,102	$ 7,435,058	$ 12,202,263	$ 15,397,758
Products
Disaggregation of Revenue [Line Items]
Total revenue	2,445,927	3,786,134	4,568,649	6,837,894
Installation services
Disaggregation of Revenue [Line Items]
Total revenue	244,553	917,363	762,249	2,611,505
Maintenance services
Disaggregation of Revenue [Line Items]
Total revenue	3,083,761	2,455,220	5,847,209	4,921,168
Energy production
Disaggregation of Revenue [Line Items]
Total revenue	370,861	276,341	1,024,156	1,027,191
Products and Services
Disaggregation of Revenue [Line Items]
Total revenue	5,831,229	7,241,767	11,366,611	14,602,277
Energy Production
Disaggregation of Revenue [Line Items]
Total revenue	370,861	276,341	1,024,156	1,027,191
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	6,145,102	7,435,058	12,202,263	15,397,758
Operating Segments | Products and Services
Disaggregation of Revenue [Line Items]
Total revenue	5,774,241	7,158,717	11,178,107	14,370,567
Operating Segments | Products and Services | Products
Disaggregation of Revenue [Line Items]
Total revenue	2,445,927		4,568,649
Operating Segments | Products and Services | Installation services
Disaggregation of Revenue [Line Items]
Total revenue	244,553	917,363	762,249	2,611,505
Operating Segments | Products and Services | Maintenance services
Disaggregation of Revenue [Line Items]
Total revenue	3,083,761	2,455,220	5,847,209	4,921,168
Operating Segments | Products and Services | Energy production
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Operating Segments | Energy Production
Disaggregation of Revenue [Line Items]
Total revenue	370,861	276,341	1,024,156	1,027,191
Operating Segments | Energy Production | Products
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Operating Segments | Energy Production | Installation services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Operating Segments | Energy Production | Maintenance services
Disaggregation of Revenue [Line Items]
Total revenue	0	$ 0	0	$ 0
Operating Segments | Energy Production | Energy production
Disaggregation of Revenue [Line Items]
Total revenue	$ 370,861		$ 1,024,156

XML

Revenue - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Revenue Recognition [Abstract]
Payment term on product sales	30 days
Payment term on contractually determined milestones	30 days
Payment term on energy production contract invoices	30 days
Revenue recognized that was in unbilled revenue at beginning of period	$ 0.9
Revenue billed this period that had been recognized in previous periods	1.3
Deferred revenue recognized	0.7
Remaining performance obligations	$ 1.4
Performance obligation revenue expected to be recognized over the next 24 months (percent)	86.80%
Performance obligation revenue to be recognized in first 12 months (percent)	82.10%
Performance obligation revenue to be recognized over the subsequent 12 months (percent)	4.70%

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Loss Per Common Share - Schedule of Income (Loss) Per Common Share, Basic and Diluted (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) available to stockholders	$ 399,631	$ (653,888)	$ 2,166,338	$ (1,856,275)
Weighted average shares outstanding - basic	24,850,261	24,850,261	24,850,261	24,850,256
Effect of dilutive securities:
Weighted average shares outstanding - Diluted	25,125,210	24,850,261	25,102,470	24,850,256
Net income (loss) per share - basic (in USD per share)	$ 0.02	$ (0.03)	$ 0.09	$ (0.07)
Net income (loss) per share - diluted (in usd per share)	$ 0.02	$ (0.03)	$ 0.09	$ (0.07)
Stock Options
Effect of dilutive securities:
Stock options	274,949	0	252,209	0
Anti-dilutive shares underlying stock options outstanding	985,296	1,270,666	777,296	1,269,662

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Inventory (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 6,414,152	$ 6,227,591
Less: reserves	(381,000)	(381,000)
Raw materials, net	6,033,152	5,846,591
Work-in-process	345,228	329,702
Finished goods	433,145	992,303
Inventories, net	$ 6,811,525	$ 7,168,596

XML

Property, Plant and Equipment - Summary of Property and Equipment (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,889,371	$ 5,811,893
Less - accumulated depreciation and amortization	(3,864,037)	(3,528,047)
Property and equipment, net, before construction in progress	2,025,334	2,283,846
Energy systems
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,556,488	3,526,514
Energy systems | Minimum
Property, Plant and Equipment [Line Items]
Useful life - years	1 year
Energy systems | Maximum
Property, Plant and Equipment [Line Items]
Useful life - years	15 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,495,528	1,448,024
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life - years	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life - years	7 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 193,698	193,698
Useful life - years	5 years
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 192,865	192,865
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Useful life - years	3 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Useful life - years	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 450,792	$ 450,792

XML

Property, Plant and Equipment - Depreciation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 145,458	$ 176,357	$ 306,014	$ 352,017

XML

Intangible Assets and Liabilities Other Than Goodwill -Amounts related to intangible assets (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 2,494,752	$ 2,496,470
Less - accumulated amortization	(1,250,379)	(1,136,151)
Intangible assets, net	1,244,373	1,360,319
Unfavorable contract liability	2,534,818	2,534,818
Less - accumulated amortization	(1,096,540)	(917,767)
Unfavorable contract liability, net	1,438,278	1,617,051
Product Certifications
Finite-Lived Intangible Assets [Line Items]
Intangible assets	726,159	726,159
Less - accumulated amortization	(505,542)	(478,357)
Intangible assets, net	220,617	247,802
Patents
Finite-Lived Intangible Assets [Line Items]
Intangible assets	853,296	855,014
Less - accumulated amortization	(268,379)	(220,764)
Intangible assets, net	584,917	634,250
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets	240,000	240,000
Less - accumulated amortization	(132,000)	(124,000)
Intangible assets, net	108,000	116,000
Favorable contract asset
Finite-Lived Intangible Assets [Line Items]
Intangible assets	384,465	384,465
Less - accumulated amortization	(335,032)	(313,030)
Intangible assets, net	49,433	71,435
Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets	26,896	26,896
Less - accumulated amortization	0	0
Intangible assets, net	26,896	26,896
In Process R&D
Finite-Lived Intangible Assets [Line Items]
Intangible assets	263,936	263,936
Less - accumulated amortization	(9,426)	0
Intangible assets, net	$ 254,510	$ 263,936

XML

Intangible Assets and Liabilities Other Than Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 51,187	$ 20,312	$ 94,077	$ 43,128
Net credit to cost of sales for amortization of contract related intangible assets and liabilities	$ 79,569	$ 95,364	158,622	203,361
Asset abandonment charge			$ 7,400	$ 179,944

XML

Intangible Assets and Liabilities Other Than Goodwill - Future Amortization of Customer Contracts (Details)	Jun. 30, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Year 5	$ 60,360
Thereafter	1,012
Customer Contracts
Finite-Lived Intangible Assets [Line Items]
Year 1	(127,451)
Year 2	(94,816)
Year 3	(52,826)
Year 4	(7,080)
Total	$ (220,801)

XML

Sale of Energy Producing Assets and Goodwill Impairment (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) site sale	Jun. 30, 2021 USD ($)
Discontinued Operations and Disposal Groups [Abstract]
Number of sales of energy producing assets | sale	2
Number of energy producing sites sold | site	8
Consideration received	$ 7,000,000
Maintenance and operation fee payable		$ 21,051

XML

Leases (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Lease cost	$ 198,943	$ 196,103	$ 394,216	$ 386,138
Cash paid for amounts included in the measurement of operating lease liabilities			$ 352,579
Weighted-average remaining lease term - operating leases	4 years 3 months 18 days		4 years 3 months 18 days
Weighted-average discount rate - operating leases (percent)	6.00%		6.00%

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Leases - Future Minimum Lease Commitments (Details)	Jun. 30, 2021 USD ($)
Leases [Abstract]
Year 1	$ 363,163
Year 2	734,110
Year 3	745,417
Year 4	299,424
Year 5	108,799
Thereafter	331,128
Total lease payments	2,582,041
Less: imputed interest	321,700
Total	$ 2,260,341

XML

Stock-Based Compensation - Stock-Based Compensation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Noncash Expense	$ 54,681	$ 39,494	$ 93,766	$ 81,730
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized, amount	$ 563,847		$ 563,847
Compensation cost not yet recognized, period for recognition			2 years 1 month 13 days
Tecogen | Amended Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for future issuance	3,838,750		3,838,750
Number of shares remaining available for future issuance	807,312		807,312

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Stock-Based Compensation - Stock Option Activity (Details) - Tecogen - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2019	Jun. 30, 2021	Dec. 31, 2020
Stock Options Outstanding [Roll Forward]
Beginning (shares)	2,496,242		2,496,242
Granted (shares)			208,000
Exercised (shares)			0
Canceled and forfeited (shares)			(253,500)
Ending (shares)			2,450,742
Exercisable (shares)			666,408
Vested and expected to vest (shares)			2,183,092
Exercise Price Per Share [Abstract]
Exercise Price Per Share, Outstanding, Minimum (per share)	$ 0.71		$ 0.71
Exercise Price Per Share, Outstanding, Maximum (dollars per share)	10.33		10.33
Exercise price per share, Granted (dollars per share)			1.75
Exercise Price, Canceled and Forfeited (dollars per share)			2.60
Weighted Average Exercise Price [Roll Forward]
Beginning (usd per share)	$ 1.94		1.94
Granted (usd per share)			1.75
Canceled and forfeited (usd per share)			2.60
Ending (usd per share)			1.86
Exercisable (usd per share)			4.00
Vested and expected to vest (usd per share)			$ 1.96
Weighted Average Remaining Life		7 years 4 months 13 days	7 years 10 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding, Aggregate Intrinsic Value			$ 1,709,243	$ 731,744
Exercisable, Aggregate Intrinsic Value			27,583
Vested and expected to vest, Aggregate Intrinsic Value			$ 1,456,994

XML

Fair Value Measurements - Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 0		$ 0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities		$ 118,084	118,084	$ 216,487
Total recurring fair value measurements	168,739		118,084
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	0		0
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	168,739		118,084
Eurosite Power, Inc. | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	0		0
Eurosite Power, Inc. | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	168,739		118,084
Eurosite Power, Inc. | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	0		0
Eurosite Power, Inc. | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	$ 168,739		$ 118,084

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Fair Value Measurements - Change in Level 2 Assets (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from the sale of investment securities	$ 11,637	$ 0
Gain on sale	$ 6,046	0
Eurosite Power, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Equity, Number of Shares Sold	93,187
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, beginning	$ 118,084	216,487
Sale of 93,187 shares	(5,591)
Unrealized loss included in net income for the six months ended June 30, 2019	56,246	(98,403)
Fair value, ending		118,084
Fair Value, Measurements, Recurring | Level 2 | Eurosite Power, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, ending	$ 168,739	$ 118,084

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Revolving Line of Credit, Bank (Details) - Webster Business Credit Corporation						3 Months Ended	6 Months Ended
	Feb. 05, 2021 USD ($) payment	Jan. 11, 2021 USD ($)	May 11, 2020 USD ($)	Apr. 17, 2020 USD ($) payment	May 04, 2018 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)
Line of Credit Facility [Line Items]
Line of credit limit					$ 10,000,000
Fixed charge coverage ratio					1.10
Annual financial capital expenditure limit					$ 500,000
Debt issuance costs incurred					$ 145,011
Amortization period for debt issuance costs					3 years
Amortization of deferred debt issuance costs						$ 38,276	$ 50,775
Early termination fee			$ 25,000
Line of credit outstanding			$ 0
PPP Loan Program
Line of Credit Facility [Line Items]
Notes payable	$ 1,874,269			$ 1,874,200
Stated interest rate (percent)	1.00%			1.00%
Number of monthly installments | payment	44			18
Monthly payment amount	$ 43,400			$ 106,356
Principal amount forgiven		$ 1,874,200
Accrued interest forgiven		13,659
Extinguishment of debt, amount		$ 1,887,859
Loan proceeds used for covered expenses, payroll, rent and utilities, percent, CARES Act	100.00%
One Month LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable interest rate (percent)					3.00%
Lender's Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable interest rate (percent)					1.50%
Federal Funds Rate
Line of Credit Facility [Line Items]
Basis spread on variable interest rate (percent)					0.50%
Lender's Base Rate - One Month LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable interest rate (percent)					2.75%

XML

Commitments and Contingencies (Details) - Eurosite Power, Inc.	Jun. 30, 2021 USD ($)
Loss Contingencies [Line Items]
Guarantee of obligations of Eurosite Power, Inc.	$ 29,013
Guarantee liability	$ 7,000

XML

Segments (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating divisions | segment			2
Revenue	$ 6,145,102	$ 7,435,058	$ 12,202,263	$ 15,397,758
Gross profit	2,842,638	2,905,991	5,793,846	5,698,158
Assets	31,319,242	35,873,453	31,319,242	35,873,453	$ 30,073,653
Products and Services
Segment Reporting Information [Line Items]
Revenue	5,831,229	7,241,767	11,366,611	14,602,277
Gross profit	2,704,130	2,835,526	5,396,105	5,361,247
Assets	26,804,525	20,343,337	26,804,525	20,343,337
Energy Production
Segment Reporting Information [Line Items]
Revenue	370,861	276,341	1,024,156	1,027,191
Gross profit	138,508	70,465	397,741	336,911
Assets	4,514,717	2,973,048	4,514,717	2,973,048
Corporate, other and elimination
Segment Reporting Information [Line Items]
Revenue	(56,988)	(83,050)	(188,504)	(231,710)
Gross profit	0	0	0	0
Assets	0	12,557,068	0	12,557,068
Operating Segments
Segment Reporting Information [Line Items]
Revenue	6,145,102	7,435,058	12,202,263	15,397,758
Operating Segments | Products and Services
Segment Reporting Information [Line Items]
Revenue	5,774,241	7,158,717	11,178,107	14,370,567
Operating Segments | Energy Production
Segment Reporting Information [Line Items]
Revenue	370,861	276,341	1,024,156	1,027,191
Operating Segments | Corporate, other and elimination
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment Eliminations | Products and Services
Segment Reporting Information [Line Items]
Revenue	56,988	83,050	188,504	231,710
Intersegment Eliminations | Energy Production
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment Eliminations | Corporate, other and elimination
Segment Reporting Information [Line Items]
Revenue	$ (56,988)	$ (83,050)	$ (188,504)	$ (231,710)