Document

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q



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

For the quarterly period ended June 30, 2017



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

Commission file number 001-36103

TECOGEN INC.

(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)	(Zip Code)

Registrant’s Telephone Number, Including Area Code: (781) 622-1120

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 and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post 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 o	Smaller reporting company x
			Emerging Growth company x

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 ý



Title of each class		Outstanding, July 31, 2017
Common Stock, $0.001 par value		24,714,989

TECOGEN INC.

QUARTERLY REPORT ON FORM 10-Q

FOR THE PERIOD ENDED JUNE 30, 2017

TABLE OF CONTENTS



PART I - FINANCIAL INFORMATION

Item 1.	Financial Statements	1

	Condensed Consolidated Balance Sheets (Unaudited)
	June 30, 2017 and December 31, 2016	1

	Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited)
	Three Months Ended June 30, 2017 and 2016	2

	Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited)
	Six Months Ended June 30, 2017 and 2016	3

	Condensed Consolidated Statements of Cash Flows (Unaudited)
	Six Months Ended June 30, 2017 and 2016	3

	Notes to Unaudited Condensed Consolidated Financial Statements	5

Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	15

Item 3.	Quantitative and Qualitative Disclosures About Market Risk	20

Item 4.	Controls and Procedures	20

PART II - OTHER INFORMATION

Item 1.	Legal Proceedings	20

Item 1A.	Risk Factors	21

Item 6.	Exhibits	23

Signatures	Signature Page	25

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, 2017			December 31, 2016
ASSETS
Current assets:
Cash and cash equivalents	$	3,317,928		$	3,721,765
Accounts receivable, net	8,868,157			8,630,418
Unbilled revenue	3,239,588			2,269,645
Inventory, net	6,099,770			4,774,264
Due from related party	378,296			260,988
Prepaid and other current assets	823,629			401,876
Total current assets	22,727,368			20,058,956
Property, plant and equipment, net	15,725,008			517,143
Intangible assets, net	2,098,484			1,065,967
Excess of cost over fair value of net assets acquired	12,570,809			—
Goodwill	40,870			40,870
Other assets	2,423,510			2,058,425
TOTAL ASSETS	$	55,586,049		$	23,741,361

LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	4,501,662		$	3,367,481
Accrued expenses	1,899,769			1,378,258
Deferred revenue	1,183,350			876,765
Loan due to related party	850,000			—
Interest payable, related party	26,548			—
Total current liabilities	8,461,329			5,622,504
Long-term liabilities:
Deferred revenue, net of current portion	449,741			459,275
Senior convertible promissory note, related party	3,148,898			3,148,509
Unfavorable contract liability	10,304,451			—
Total liabilities	22,364,419			9,230,288
Commitments and contingencies (Note 9)

Stockholders’ equity:
Tecogen Inc. stockholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 24,711,989 and 19,981,912 issued and outstanding at June 30, 2017 and December 31, 2016, respectively	24,712			19,982
Additional paid-in capital	56,027,038			37,334,773
Accumulated other comprehensive loss-investment securities	(224,359		)	—
Accumulated deficit	(23,092,431		)	(22,843,682		)
Total Tecogen Inc. stockholders’ equity	32,734,960			14,511,073
Noncontrolling interest	486,670			—
Total stockholders’ equity	33,221,630			14,511,073
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	55,586,049		$	23,741,361

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

TECOGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(unaudited)



	Three Months Ended
	June 30, 2017			June 30, 2016
Revenues
Products	$	3,116,198		$	2,408,860
Services	3,700,150			3,278,448
Energy production	774,192			—
Total revenues	7,590,540			5,687,308
Cost of sales
Products	1,965,881			1,767,052
Services	2,307,494			1,817,362
Energy production	330,543			—
Total cost of sales	4,603,918			3,584,414
Gross profit	2,986,622			2,102,894
Operating expenses
General and administrative	2,406,244			2,002,172
Selling	607,511			335,089
Research and development	218,724			151,663
Total operating expenses	3,232,479			2,488,924
Loss from operations	(245,857		)	(386,030		)
Other income (expense)
Interest and other income	7,397			2,770
Interest expense	(38,082		)	(44,053		)
Total other expense, net	(30,685		)	(41,283		)
Consolidated net loss	(276,542		)	(427,313		)
(Income) loss attributable to the noncontrolling interest	(16,998		)	11,774
Net loss attributable to Tecogen Inc.	(293,540		)	(415,539		)
Other comprehensive loss - unrealized loss on securities	(224,359		)	—
Comprehensive loss	$	(517,899	)	$	(415,539	)

Net loss per share - basic and diluted	$	(0.01	)	$	(0.02	)
Weighted average shares outstanding - basic and diluted	23,120,351			19,088,828

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

TECOGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(unaudited)



	Six Months Ended
	June 30, 2017			June 30, 2016
Revenues
Products	$	5,923,543		$	4,675,008
Services	7,739,570			6,087,815
Energy production	774,192			—
Total revenues	14,437,305			10,762,823
Cost of sales
Products	3,722,730			3,319,768
Services	4,482,739			3,620,817
Energy production	330,543			—
Total cost of sales	8,536,012			6,940,585
Gross profit	5,901,293			3,822,238
Operating expenses
General and administrative	4,615,148			3,894,392
Selling	1,054,963			850,121
Research and development	399,339			370,621
Total operating expenses	6,069,450			5,115,134
Loss from operations	(168,157		)	(1,292,896		)
Other income (expense)
Interest and other income	6,184			5,661
Interest expense	(69,784		)	(86,434		)
Total other expense, net	(63,600		)	(80,773		)
Consolidated net loss	(231,757		)	(1,373,669		)
(Income) loss attributable to the noncontrolling interest	(16,998		)	64,962
Net loss attributable to Tecogen Inc.	(248,755		)	(1,308,707		)
Other comprehensive loss - unrealized loss on securities	(224,359		)	—
Comprehensive loss	$	(473,114	)	$	(1,308,707	)

Net loss per share - basic and diluted	$	(0.01	)	$	(0.07	)
Weighted average shares outstanding - basic and diluted	21,587,589			18,783,909

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

TECOGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)



	Six Months Ended
	June 30, 2017			June 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net loss	$	(231,757	)	$	(1,373,669	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	242,876			131,941
Provision (recovery) of inventory reserve	25,609			(40,000		)
Stock-based compensation	97,684			88,177
Non-cash interest expense	389			23,050
Loss on sale of assets	2,909			640
Provision for losses on accounts receivable	1,335			—
Changes in operating assets and liabilities, net of effects of acquisitions
(Increase) decrease in:
Short term investments	—			294,802
Accounts receivable	355,740			(954,191		)
Unbilled revenue	(952,864		)	(141,827		)
Inventory, net	(1,242,782		)	782,728
Due from related party	(118,612		)	785,818
Prepaid expenses and other current assets	(99,601		)	(134,033		)
Other non-current assets	65,687			—
Increase (decrease) in:
Accounts payable	786,419			(693,524		)
Accrued expenses and other current liabilities	(10,362		)	(30,078		)
Deferred revenue	176,852			(165,186		)
Interest payable, related party	8,523			—
Net cash used in operating activities	(891,955		)	(1,425,352		)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(209,265		)	(100,925		)
Purchases of intangible assets	(22,539		)	(50,970		)
Cash acquired in acquisition	971,454			—
Payment of stock issuance costs	(365,566		)	—
Net cash provided by (used in) investing activities	374,084			(151,895		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from demand notes payable, related party	—			150,000
Payment of stock issuance costs	—			(8,544		)
Proceeds from the exercise of stock options	114,034			18,925
Net cash provided by financing activities	114,034			160,381
Net decrease in cash and cash equivalents	(403,837		)	(1,416,866		)
Cash and cash equivalents, beginning of the period	3,721,765			5,486,526
Cash and cash equivalents, end of the period	$	3,317,928		$	4,069,660
Supplemental disclosures of cash flows information:
Cash paid for interest	$	—		$	72,199
Exchange of stock for non-controlling interest in Ilios	$	—		$	330,852
Issuance of stock to acquire American DG Energy	$	18,745,007		$	—
Issuance of Tecogen stock options in exchange for American DG Energy options	$	114,896		$	—

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

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Note 1. Description of Business and Basis of Presentation

Description of business

Tecogen Inc., or the Company, we, our or us produces commercial and industrial, natural-gas-fueled engine-driven, combined heat and power (CHP) products that reduce energy costs, decrease greenhouse gas emissions and alleviate congestion on the national power grid. The Company’s products supply electric power or mechanical power for cooling, while heat from the engine is recovered and purposefully used at a facility. The Company also installs, owns, operates and maintains complete energy systems and other complementary systems at customer sites and sells 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 the Company’s customers are located in regions with the highest utility rates, typically California, the Midwest and the Northeast. The Company's common stock is listed on the NASDAQ under the ticker 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 (see Note 3. "Acquisition of American DG Energy Inc.").

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 of 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, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017.

The condensed consolidated balance sheet at December 31, 2016 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 Inc.'s Annual Report on Form 10-K and American DG Energy Inc.'s Annual Report on Form 10-K for the year ended December 31, 2016.

There have been no significant changes in accounting principles, practices or methods for making estimates.

The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and entities in which it has a controlling financial interest. Those entities include the Company's wholly-owned subsidiaries American DG Energy Inc. and Ilios Inc. and a joint venture, American DG New York, LLC, in which American DG Energy Inc. holds a 51.0% interest. Investments in partnerships and companies in which the Company does not have a controlling financial interest but where we have significant influence are accounted for under the equity method.

The Company’s 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.

Significant New Accounting Standards or Updates Not Yet Effective

Revenue Recognition In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standard update related to revenue from contracts with customers, which, along with amendments issued in 2015 and 2016, will supersede nearly all current U.S. GAAP guidance on this topic and eliminate industry-specific guidance. The underlying principle is to

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. This accounting standard update, as amended, will be effective for the Company beginning in the first quarter of fiscal 2018. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized in retained earnings as of the date of adoption ("modified retrospective basis"). The Company expects to adopt this accounting standard update on a modified retrospective basis in the first quarter of fiscal 2018, and it is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

Leases In February 2016, the FASB issued an accounting standard update related to leases requiring lessees to recognize operating and financing lease liabilities on the balance sheet, as well as corresponding right-of-use assets. The new lease standard also makes some changes to lessor accounting and aligns key aspects of the lessor accounting model with the revenue recognition standard. In addition, disclosures will be required to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2019 on a modified retrospective basis, and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

Note 2. Loss Per Common Share

Basic and diluted loss per share for the three and six months ended June 30, 2017 and 2016, respectively, were as follows:



	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Net loss attributable to stockholders	$	(293,540	)	$	(415,539	)	$	(248,755	)	$	(1,308,707	)
Weighted average shares outstanding - Basic and diluted	23,120,351			19,088,828			21,587,589			18,783,909
Basic loss per share	$(0.01)			$(0.02)			$	(0.01	)	$	(0.07	)
Anti-dilutive shares underlying stock options outstanding	1,053,778			1,196,776			1,053,778			1,196,776
Anti-dilutive convertible debentures	889,830			889,830			889,830			889,830
Anti-dilutive warrants outstanding	250,000			1,150,000			250,000			1,150,000

Note 3. Acquisition of American DG Energy Inc.

On May 18, 2017, we completed our acquisition, by means of a stock-for-stock merger, of 100% of the outstanding common shares of American DG Energy Inc. (“American DG Energy" or "ADGE”), a company which installs, owns, operates and maintains complete distributed generation of electricity systems, or DG systems or energy systems, and other complementary systems at customer sites and sells electricity, hot water, heat and cooling energy under long-term contracts at prices guaranteed to the customer to be below conventional utility rates, by means of a merger of one of our wholly owned subsidiaries with and into ADGE such that ADGE became a wholly owned subsidiary of Tecogen. We acquired ADGE to, among other reasons, expand our product offerings and benefit directly from the long-term contracted revenue streams generated by these installations. We gained control of ADGE on May 18, 2017 by issuing common stock to the prior stockholders of ADGE.

We have included the financial results of ADGE in our condensed consolidated financial statements from the date of acquisition. For the three and six months ended June 30, 2017, ADGE contributed $774,192 to our total revenues and $443,649 to our gross profit.

Acquisition related costs included in general and administrative expenses totaled $99,773 and $118,853, respectively for the three and six month periods ended June 30, 2017. Stock issuance related costs totaling $365,566 were netted against additional paid in capital during the six month period ended June 30, 2017.

The merger is intended to qualify for federal income tax purposes as a tax-free reorganization under the provisions of Section 368(a) of the Internal Revenue Code of 1986. Subject to the terms and conditions of the merger agreement, at the closing of the merger, each outstanding share of ADGE common stock was converted into the right to receive approximately 0.092 shares of common stock of Tecogen (the "Exchange Ratio").

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Also in connection with the merger, Tecogen, at the effective time of the merger, assumed the (a) outstanding stock options of ADGE and (b) outstanding warrants to purchase common stock of ADGE, each as adjusted pursuant to the Exchange Ratio and subject to the terms of the merger agreement.

The fair value of the 4,662,937 shares of common stock issued as part of the consideration for the acquisition was determined based on the closing market price of Tecogen’s stock on the date of acquisition. Additionally, as there is no required service condition in the assumed equity-based awards, 100% of the estimated fair value of the replacement equity-based awards at the date of the merger is considered attributable to pre-combination service and accordingly is included in the consideration.

The following table summarizes the consideration paid for ADGE and the amounts of the assets acquired and liabilities assumed recognized at the acquisition date, as well as the fair value at the acquisition date of the noncontrolling interest in American DG New York, LLC, a consolidated subsidiary of ADGE.



Consideration
Tecogen common stock - 4,662,937 shares	$	18,745,007
Assumed fully vested equity awards	114,896
	$	18,859,903

Recognized amounts of identifiable assets acquired and liabilities assumed
Financial assets	$	1,583,190
Inventory	108,333
Prepaid and other current assets	358,628
Property, plant and equipment	15,430,250
Investment securities	519,568
Identifiable intangibles assets	1,456,166
Financial liabilities	(1,857,859		)
Unfavorable contract liability	(10,838,571		)
Other liabilities	(939		)
Total identifiable net assets	6,758,766
Noncontrolling interest in American DG New York, LLC	(469,672		)
Excess of cost over fair value of net assets acquired	12,570,809
	$	18,859,903

Amounts recognized in respect of inventory, property, plant and equipment, identifiable intangible assets, unfavorable contract liability and noncontrolling interest are provisional pending completion of the necessary valuations and analysis.

Excess of cost over fair value of net assets acquired of $12.6 million arising from the acquisition is primarily attributable to the going concern element of ADGE’s business, including its assembled workforce and the long-term contractual nature of its business, as well as expected cost synergies from the merger related primarily to the elimination of administrative overhead and duplicative personnel. None of the excess purchase price over net assets acquired recognized is expected to be deductible for income tax purposes.

Identified intangible assets and the unfavorable contract liability, both of which relate to existing customer contracts, and the estimated amortization are more fully described in Note 5, "Intangible Assets and Liabilities Other Than Goodwill and Excess of Cost Over Fair Value of Net Assets Acquired".

The fair value of the noncontrolling interest in American DG New York, LLC, a consolidated subsidiary of ADGE, was estimated using the income approach. This fair value measurement is based on significant inputs that are not observable in the market and thus represents a fair value measurement categorized within level 3 of the fair value hierarchy described in ASC Section 820-10-35. Key assumptions include a discount rate of 5.61% and the run out of existing contracts at current levels of profitability.

Unaudited Pro Forma Financial Information

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

The unaudited pro forma financial information in the table below summarizes the combined results of operations for Tecogen and ADGE as though the companies were combined as of the beginning of fiscal 2016. The pro forma financial information for all periods presented also includes the business combination accounting effects resulting from the acquisition including amortization charges and credits from acquired intangible assets and liabilities (certain of which are preliminary), and depreciation adjustments related to fair value as though the aforementioned companies were combined as of the beginning of fiscal 2016. The pro forma financial information as presented below is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisition had taken place at the beginning of fiscal 2016.



	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Total revenues	$	8,303,268		$	6,972,832		$	16,579,392		$	13,220,810
Net loss	(833,148		)	(523,538		)	(1,294,083		)	(1,993,124		)
Basic and diluted loss per share	(0.04		)	(0.02		)	(0.06		)	(0.09		)

One-time acquisition-related expenses related to the merger incurred during the three-month and six-month periods ended June 30, 2017 are not included in the unaudited pro forma financial information as they are not expected to have a continuing impact on the consolidated results.

The unaudited pro forma financial information does not include the revenues or results of operations of a subsidiary previously owned and consolidated by American DG Energy as that subsidiary was disposed of in 2016 prior to acquisition by Tecogen and was considered to be a discontinued operation by American DG Energy. Additionally, the unaudited pro forma financial information does not include a gain recognized on deconsolidation of that same subsidiary by American DG Energy and an amount of interest cost related to American DG Energy's long-term debt which was extinguished contemporaneously with the disposition of the subsidiary.

Note 4. Property, Plant and Equipment

Property, plant and equipment at June 30, 2017 and December 31, 2016 consisted of the following:



	Estimated Useful Life (in Years)	June 30, 2017			December 31, 2016
Energy systems	1 - 15 years	$	12,883,503		$	—
Machinery and equipment	5 - 7 years	1,121,289			1,009,893
Furniture and fixtures	5 years	103,971			141,874
Computer software	3 - 5 years	190,152			102,415
Leasehold improvements	*	440,519			437,341
		14,739,434			1,691,523
Less - accumulated depreciation and amortization		(1,591,488		)	(1,174,380		)
		13,147,946			517,143
Construction in progress		2,577,062			—
		$	15,725,008		$	517,143

* 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, 2017 and 2016 was $289,336 and $330,808, and $39,543 and $83,171, respectively.

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Note 5. Intangible Assets and Liabilities Other Than Goodwill and Excess of Cost Over Fair Value of Net Assets Acquired

As of June 30, 2017 and December 31, 2016 the Company had the following amounts related to intangible assets and liabilities other than goodwill and excess of cost over fair value of net assets acquired:



	June 30, 2017							December 31, 2016
Intangible assets	Cost		Accumulated Amortization			Total		Cost		Accumulated Amortization			Total
Product certifications	$	598,264	$	(259,667	)	$	338,597	$	544,651	$	(233,992	)	$	310,659
Patents	649,081		(138,992		)	510,089		681,155		(123,012		)	558,143
Developed technology	240,000		(68,000		)	172,000		240,000		(60,000		)	180,000
Trademarks	18,165		—			18,165		17,165		—			17,165
Favorable contract asset	1,071,096		(11,463		)	1,059,633		—		—			—
	$	2,576,606	$	(478,122	)	$	2,098,484	$	1,482,971	$	(417,004	)	$	1,065,967

Intangible liability
Unfavorable contract liability	$	10,453,501	$	(149,050	)	$	10,304,451	$	—	$	—		$	—

The aggregate amortization expense related to intangible assets and liabilities exclusive of contract related intangibles for the six months ended June 30, 2017 and 2016 was $49,655 and $48,770, 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, 2017 and 2016 was $137,587 and $-0-, respectively.

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 the Company on May 18, 2017 (see Note 3. "Acquisition of American DG Energy Inc."). These contracts are long-term and provide customers with an alternative source of electrical power in addition to that provided by the local power utility, at rates that are lower than local utilities. This alternative electrical power is typically produced by ADGE owned, operated and maintained natural gas powered systems installed at the customers' sites, with ADGE bearing all costs of operation and maintenance. In addition to the alternative source of electrical power provided by ADGE’s systems, customers can opt to add and take advantage of the heat generated in the electrical production process in the form of hot water and/or space heating. Pricing to the customer for electrical power produced and supplied by ADGE under the contracts is under a fixed formula which requires the customer to pay for the kilowatts of electrical power provided at a fixed percentage discount to the local utility’s electric rate for that period. As a result, as utility rates for electrical power change, the amount ADGE is able to charge the customer under the contract also changes. There has been a sharp decrease in electric rates over the past several years, subsequent to the vast majority of customer contract dates, causing the billable value of the electrical power generated by ADGE’s systems to decrease, resulting in a deterioration of expected profitability. As of the date of acquisition, utility electric rates were significantly below the level anticipated at the time the fixed percentage discounts contained in the vast majority of ADGE’s customer contracts were contracted for, thus these contract terms, although they produce cash flow, were considered to be off market in the vast majority of ADGE’s customer contracts. Additionally, the demand and volume of kilowatts produced and billed for vary by contract and by period and in certain instances have been significantly below what was originally expected such that had it been known at the time the contract(s) were negotiated, it would have influenced ADGE’s determination of the level of the fixed percentage discount in those contracts.

The determination of fair value requires development of an estimate of the price at which an orderly transaction to sell the asset or to transfer the liability would take place between market participants at the measurement date under current market conditions. Contracts are considered to be assets or liabilities by virtue of the rights and obligations inherent in the contract terms. Typically, contracts with terms considered to be at market are considered to have no fair value as in order to be entitled to the rights under the contract performance must occur for which a market rate of return is earned due to the at market terms. The fair value of a contract is primarily a measurement of its off market terms. The obligation to perform under a contract with terms that are unfavorable to market results in a liability to the extent its terms are off market. The resulting liability is an estimate of the price that would need to be paid to a willing market participant to assume the obligations under the contract in order for them to receive a market rate of return for their remaining performance obligation under the contract. The exact

TECOGEN INC.

Notes to Unaudited Condensed Consolidated Financial Statements

opposite holds true in instances where the terms of a contract are considered to be favorable to market. In that case an asset would exist as an estimate of the price that would be received from a willing market participant in order to be entitled to the rights under the contract.

In determining the estimate of fair value of ADGE’s customer contracts, the measure of at market, and thus the baseline to measure the amount related to any of the off market terms or conditions with respect to the contracts, was considered best determined, given the nature of the services provided under the contracts, by utilizing a benchmark level of margin contribution, in this case 35% on revenue which is consistent with the average return on revenue of US investor owned public utilities. It is believed that a market participant would have utilized a similar margin in arriving at a buy price for the contract(s).

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 is estimated to be as follows:



Year 1	$	(1,056,338	)
Year 2	(914,783		)
Year 3	(826,089		)
Year 4	(839,851		)
Year 5	(840,519		)

Note 6. Goodwill and Excess of Cost Over Fair Value of Net Assets Acquired

Changes in the carrying amount of goodwill and excess of cost over fair value of net assets acquired

were as follows:



	Goodwill		Excess of cost over fair value of net assets acquired
Balance at December 31, 2016	$	40,870	$	—
Acquisitions	—		12,570,809
Balance June 30, 2017	$	40,870	$	12,570,809

Excess of cost over fair value of net assets acquired at June 30, 2017 has not as of yet been allocated to the respective segments pending completion of the necessary analysis.

Note 7. Stock-Based Compensation

Stock-Based Compensation

The Company adopted the 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 of the Company. The Plan was amended at various dates by the Board of Directors to increase the reserved shares of common stock issuable under the Plan to 3,838,750 as of June 30, 2017, or 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, 2017 was 2,190,174.

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Notes to Unaudited Condensed Consolidated Financial Statements

Stock option activity for the six months ended June 30, 2017 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, 2016	1,117,918		$0.79-$5.39		$	3.10	5.00 years	$	1,415,150
Granted	3,000		3.72		3.72
Assumed in merger	156,124		$3.15-$30.33	—	10.35
Exercised	(67,140	)	$0.79-$2.00		1.70
Canceled and forfeited	(3,750	)	2.60		2.60
Outstanding, June 30, 2017	1,206,152		$0.79-$30.33		$	4.14	4.99 years	$	712,102
Exercisable, June 30, 2017	951,402				$	4.04		$	712,102
Vested and expected to vest, June 30, 2017	1,167,940				$	4.13		$	712,102

Consolidated stock-based compensation expense for the six months ended June 30, 2017 and 2016 was $97,684 and $88,177, respectively. No tax benefit was recognized related to the stock-based compensation recorded during the periods.

Note 8. 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. The Company currently does 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.

Level 3 - Unobservable inputs reflecting management’s own assumptions about the input used in pricing the asset or liability.

The following table presents the asset reported in the consolidated balance sheet measured at its fair value on a recurring basis as of June 30, 2017 by level within the fair value hierarchy.



June 30, 2017			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
	Total		Level 1		Level 2		Level 3		Total gains (losses)
Recurring fair value measurements
Available-for-sale equity securities
EuroSite Power Inc.	$	295,209	$	—	$	—	$	295,209	$	(224,359	)
Total recurring fair value measurements	$	295,209	$	—	$	—	$	295,209	$	(224,359	)

The Company utilizes a Level 3 category fair value measurement to value its investment in EuroSite Power as an available-for-sale security at period end. That measurement is determined by management based on the lowest closing sales price in a 15 day trading period prior to period end.

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Notes to Unaudited Condensed Consolidated Financial Statements

The following table summarizes changes in level 3 assets which are comprised of available-for-sale securities for the period:



Fair value at acquisition on May 18, 2017	$	519,568
Unrealized loss recognized in other comprehensive loss	(224,359		)
Fair value at June 30, 2017	$	295,209

Note 9. Commitments and Contingencies

The Company guarantees certain obligations of a former subsidiary of American DG Energy, EuroSite Power 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, 2017 of approximately $310,000 due ratably in equal installments through September 2021, and certain guarantees of performance in respect of certain customer contracts. Based on current conditions, the Company does not believe there to be any amounts probable of payment by the Company under any of the guarantees and has estimated the value associated with the non-contingent aspect of the guarantees is approximately $10,000 which is recorded as liability in the accompanying financial statements.

Legal Proceedings

Tecogen is not currently a party to any material litigation arising from its operations, and it is not aware of any pending or threatened litigation against it relating to its operations that could have a material adverse effect on its business, operating results or financial condition. However, it is or has been a party to a claim in the Superior Court of the Commonwealth of Massachusetts and named as a defendant in a case in the United States District Court for the District of Massachusetts, described below, related to the Merger.

Massachusetts Superior Court Action

On or about February 6, 2017, ADGE, John Hatsopoulos, George N. Hatsopoulos, Charles T. Maxwell, Deanna M. Petersen, Christine Klaskin, John Rowe, Joan Giacinti, Elias Samaras, Tecogen, and Merger Sub were served with a Verified Complaint by William C. May ("May"), individually and on behalf of the other shareholders of ADGE as a class. The action was commenced in the Business Litigation Session of the Superior Court of the Commonwealth of Massachusetts, Civil Action No. 17-0390. The complaint alleged class action claims arising out of the proposed Merger. On May 31, 2017, May voluntarily dismissed the action and consolidated his claims with the pending federal action in the United States District Court for the District of Massachusetts. If the complaint in the federal court is dismissed, it is possible that May or another plaintiff will recommence an action in state court with similar claims to those asserted by May.

United States District Court Action

On or about February 15, 2017, a lawsuit was filed in the United States District Court for the District of Massachusetts by Lee Vardakas (“Vardakas”), individually and on behalf of other stockholders of ADGE, naming ADGE, John N. Hatsopoulos, George N. Hatsopoulos, Benjamin Locke, Charles T. Maxwell, Deanne M. Petersen, Christine M. Klaskin, John Rowe, Joan Giacinti, Elias Samaras, Tecogen., Merger Sub., and Cassel Salpeter and Co., LLC, as defendants. The action is captioned Vardakas v. American DG Energy, Inc., Case No. 17-CV-10247(LTS). At the time Vardakas commenced the action, his complaint challenged the proposed Merger between Tecogen and ADGE.

On May 18, 2017, ADGE’s and Tecogen’s shareholders approved the Merger.

Following the consummation of the Merger (and the appointment of May, from the Massachusetts Superior Court Action, as lead plaintiff), Vardakas filed an Amended Class Action Complaint (the “Amended Complaint”). The Amended Complaint discontinued the claims against Cassel Salpeter & Co., LLC but asserted against the remaining defendants claims under Section 14(a) of the Securities Exchange Act of 1934 (the “Exchange Act”) and SEC Rule 14a-9; claims against certain defendants for control person liability under § 20(a) of the Exchange Act (collectively, the “Federal Securities Law Claims”); and common law claims for breach of fiduciary duty and aiding and abetting (the “State Law Claims”). The Federal Securities Law Claims allege, in substance, that defendants made material nondisclosure in the proxy statement about the process leading to the merger and about the fairness opinion relied upon by ADGE’s Board of Directors in recommending the Merger to shareholders. The State Law Claims assert, in substance, that defendants breached their fiduciary duties in negotiating and approving the merger, which, plaintiff claims, deprived ADGE’s nonaffiliated shareholders of fair value for their shares.

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Notes to Unaudited Condensed Consolidated Financial Statements

lack subject matter jurisdiction. Plaintiff’s deadline to respond to the motion is August 18, 2017 and defendants will file a reply brief on September 8, 2017.

The Company believes that the lawsuit is without merit and intends to defend vigorously. The Amended Complaint does not specify the amount of damages claimed and any estimate by the Company would be unduly speculative.

Note 10. Related Party Transactions

The Company has two affiliated companies, namely Ultra Emissions Technologies Ltd, and TTcogen LLC. These companies are related because either several of the major stockholders of those companies, have a significant ownership position in the Company or they are joint ventures between Tecogen and other parties.

In January of 2017, prior to its acquisition of American DG Energy, the Company purchased a large quantity of used equipment from American DG Energy for approximately $985,000. Tecogen plans to sell this equipment to specific customers in the coming quarters.

In connection with the acquisition of American DG Energy, the Company assumed a loan from John N. Hatsopoulos, the Company's Co-Chief Executive Officer and a Company Director. The loan is in the amount of $850,000 and bears interest at 6%, payable quarterly, and matures and becomes due and payable on May 25, 2018.

Ultra Emissions Technologies Ltd.

On December 28, 2015, the Company entered into a joint venture agreement relating to the formation of a joint venture company (the “JV”) organized to develop and commercialize Tecogen’s patented technology (“Ultera^® Technology”) designed to reduce harmful emissions generated by engines using fossil fuels. The joint venture company, called Ultra Emissions Technologies Limited, was organized under the laws of the Island of Jersey, Channel Islands.

The Company received a 50% equity interest in the JV in exchange for a fully paid-up worldwide license to use Tecogen’s Ultera emissions control technology in the field of mobile vehicles burning fossil fuels. The other half of the joint venture equity interests were purchased for $3,000,000 by a small group of offshore investors. Warrants to purchase additional equity securities in the JV were granted to all parties pro rata. If the venture is not successful, all licensed intellectual property rights will revert to Tecogen.

On August 2, 2016, Tecogen exercised 2,000,000 warrants (the "Ultratek Warrants"), in the JV, at $1.00 per share, for an aggregate amount of $2 million. The funds used to exercise the Ultratek Warrants were acquired by the Company from the holders of certain Company warrants (the "Tecogen Warrant Holders"), when they partially exercised their Tecogen warrants (the "Tecogen Warrants"), in July of 2016. The Tecogen Warrant Holders exercised a total of 675,000 Tecogen Warrants with a $4.00 exercise price, resulting in cash proceeds of $2,700,000 to the Company, which the Company then used in part to invest in the JV. An additional $8,500,000 was raised from other outside investors for a total equity investment in the JV to date of $13,500,000. Due to this investment, Tecogen's ownership has decreased to 43%.

The JV is expected to have losses as it performs the necessary research and development with the Ultera technology. The Company accounts for its interest in the JV using the equity method. Income and losses will be recorded consistent with an agreement between the JV shareholders as to how income and losses will be allocated. These allocations are consistent with the allocation of cash distributions and liquidating distributions of the JV. The shareholder agreement calls for Tecogen's investment to be returned before any other shareholder if the venture does not achieve commercialization. As a result, as of June 30, 2017, Tecogen has not recorded any of the losses of the JV as the cumulative losses of the JV have not exceeded the other owners' investments to date. As of June 30, 2017, $94,407 is due to Tecogen from Ultratek.

TTcogen LLC

On May 19, 2016, the Company along with Tedom a.s., a corporation incorporated in the Czech Republic and a European combined heat and power product manufacture ("Tedom"), entered into a joint venture, where the Company will hold a 50% participating interest and the remaining 50% interest will be with Tedom. As part of the joint venture, the parties agreed to create a Delaware limited liability company, TTcogen LLC ("TTcogen"), to carry out the business of the venture. Tedom granted TTcogen the sole and exclusive right to market, sell, offer for sale, and distribute certain products as agreed to by the parties throughout the United States. The product offerings of the joint venture expand the current Tecogen product offerings to the MicroCHP of 35kW to large 4,000kW plants. Tecogen agreed to refer all appropriate sale leads to TTcogen regarding the products agreed to by the parties and Tecogen shall have the first right to repair and maintain the products sold by TTcogen.

The Company accounts for its interest in TTcogen's operations using equity method accounting. Any initial operating losses of TTcogen are to be borne and funded by Tedom. To the extent any such losses are borne and funded solely by Tedom, the

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Notes to Unaudited Condensed Consolidated Financial Statements

Company will not recognize any portion of such losses given the Company does not guarantee the obligations of the joint venture nor is it committed to provide funding to the joint venture. As of period ending June 30, 2017, $279,069 is due to Tecogen from TTcogen.

Note 11. Segments

As of June 30, 2017, the Company was organized into two operating divisions through which senior management evaluates the Company’s business. These divisions, as described in more detail in Note 1, are organized around the products and services provided to customers and represent the Company’s reportable segments. Prior to the acquisition of ADGE (see Note 3. “Acquisition of American DG Energy Inc.”), the Company’s operations were comprised of a single segment.

The following table presents information by reportable segment for the three month periods ended June 30, 2017 and 2016 and the six month periods ended June 30, 2017 and 2016:



	Products and Services		Energy Production		Corporate, other and elimination (1)			Total
Three months ended June 30, 2017

Revenue - external customers	$	6,816,348	$	774,192	$	—		$	7,590,540
Intersegment revenue	191,818		—		(191,818		)	—
Total revenue	7,008,166		774,192		(191,818		)	7,590,540
Gross profit	2,542,973		443,649		—			2,986,622
Identifiable assets	17,687,401		16,288,369		21,610,279			55,586,049

Three months ended June 30, 2016

Revenue - external customers	$	5,687,308	$	—	$	—		$	5,687,308
Intersegment revenue	—		—		—			—
Total revenue	5,687,308		—		—			5,687,308
Gross profit	2,102,894		—		—			2,102,894
Identifiable assets	17,524,410		—		6,216,951			23,741,361

Six months ended June 30, 2017

Revenue - external customers	$	13,663,113	$	774,192	$	—		$	14,437,305
Intersegment revenue	191,818		—		(191,818		)	—
Total revenue	13,854,931		774,192		(191,818		)	14,437,305
Gross profit	5,457,644		443,649		—			5,901,293
Identifiable assets	17,687,401		16,288,369		21,610,279			55,586,049

Six months ended June 30, 2016

Revenue - external customers	$	10,762,823	$	—	$	—		$	10,762,823
Intersegment revenue	—		—		—			—
Total revenue	10,762,823		—		—			10,762,823
Gross profit	3,822,238		—		—			3,822,238
Identifiable assets	17,524,410		—		6,216,951			23,741,361

(1) Corporate, intersegment revenue, other and elimination includes various corporate assets. Excess of cost over fair value of net assets acquired at June 30, 2017 has not as of yet been allocated to the respective segments pending completion of the necessary analysis.

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Notes to Unaudited Condensed Consolidated Financial Statements

Note 12. Subsequent Events

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

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

Forward-looking statements are made throughout this Management’s Discussion and Analysis of Financial Condition and Results of Operations. Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects,” “seeks,” “estimates” and similar expressions are intended to identify forward-looking statements. Such forward-looking statements include, among other things, statements regarding our current and future cash requirements, our expectations regarding suppliers of cogeneration units, and statements regarding potential financing activities in the future. While the Company may elect to update forward-looking statements in the future, it specifically disclaims any obligation to do so, even if the Company’s estimates change, and readers should not rely on those forward-looking statements as representing the Company’s views as of any date subsequent to the date of the filing of this Quarterly Report. There are a number of important factors that could cause the actual results of the Company to differ materially from those indicated by such forward-looking statements, including those detailed under the heading “Risk Factors” in this Quarterly Report.

Overview

Tecogen Inc., or the Company, or 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 specially adapted to run on natural gas. In some cases, our customers may choose to have the Company 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 opportunity for the facility to incorporate the engine’s waste heat into onsite processes such as space and portable 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).

With the acquisition of American DG Energy Inc., or American DG or ADGE, on May 18, 2017, we now also sell energy in the form of electricity, heat, hot water and cooling to our customers under long-term energy sales agreements (with a standard term of 10 to 15 years). Our typical sales model is to own and install energy systems in our customers’ buildings and sell the energy produced by those systems back to the customers at a cost set by a negotiated formula in our customer contracts. 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 customers’ local energy utility that month. Our revenues commence as new energy systems become operational. As of June 30, 2017, we had 93 energy systems operational.

The Company’s operations are comprised of two business segments. Our Products and Services segment ("Segment 1")

designs, manufactures and sells industrial and commercial cogeneration systems as described above. Our Energy Production segment ("Segment 2") sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements.

In addition to being a smaller reporting company, Tecogen is an emerging growth company as that term is defined in the Jumpstart Our Business Startups Act of 2012 (JOBS Act).

Results of Operations

Second Quarter of 2017 Compared to Second Quarter of 2016

Revenues

Total revenues in the second quarter of 2017 were $7,590,540 compared to $5,687,308 for the same period in 2016, an increase of $1,903,232 or 33.5%.

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TECOGEN INC.

Segment 1 - Product and Services

Product revenues in the second quarter of 2017 were $3,116,198 compared to $2,408,860 for the same period in 2016, an increase of $707,338 or 29.4%. This increase was the aggregate of an increase in cogeneration sales of $567,728 and an increase in chiller and heat pump sales, which include the Ilios products, of $139,610. Service revenues in the second quarter of 2017 were $3,700,150 compared to $3,278,448 for the same period in 2016, an increase of $421,702 or 12.9%. This increase in the second quarter is due to an increase in installation activity of $281,412 and an increase of $140,290 in service contract revenues.

Segment 2 - Energy Production

Energy production revenues in the second quarter of 2017 were $774,192, which represents energy revenues earned from May 19, 2017, the date after acquisition of American DG Energy through June 30, 2017.

Cost of Sales

Cost of sales in the second quarter of 2017 was $4,603,918 compared to $3,584,414 for the same period in 2016, an increase of $1,019,504, or 28.4%.

Segment 1 - Product and Services

Cost of sales for product and services in the second quarter of 2017 was $4,273,375 compared to $3,584,414 for the same period in 2016, an increase of $688,961 or 19.2%. During the second quarter our overall gross margin was 37.3% compared to 37.0% for the same period in 2016, an increase of 0.8%. This increase is due to improved margin on product sales.

Segment 2 - Energy Production

Cost of sales for energy production in the second quarter of 2017 was $330,543 which represents the cost associated with energy revenues earned from May 19, 2017, the date after acquisition of American DG Energy through June 30, 2017. During this period our gross margin for energy production was 57.3%; higher than expected, due to seasonality and a retroactive rate change which reduced fuel costs.

Operating Expenses

General and administrative expenses consist of executive staff, accounting and legal expenses, office space, general insurance and other administrative expenses. General and administrative expenses in the quarter ending June 30, 2017 were $2,406,244 compared to $2,002,172 for the same period in 2016, an increase of $404,072 or 20.2%. The increase was mainly due to a combination of merger costs as well as increased costs from the addition of American DG Energy's operations.

Selling expenses consist of sales staff, commissions, marketing, travel and other selling related expenses. Selling expenses for the second quarter of 2017 were $607,511 compared to $335,089 for the same period in 2016, an increase of $272,422 or 81.3%. This difference is due to the mix of in-house sales versus representation commissions and increased public relations and trade show costs.

Research and development expenses consist of engineering and technical staff, materials, outside consulting and other related expenses. Research and development expenses in the quarter ending June 30, 2017 were $218,724 compared to $151,663 for the same period in 2016, an increase of $67,061 or 44.2%. This increase was due to the Company's cost sharing in connection with a research and development grant, which pertains to the potential commercialization of the Company's Ultera emissions technology for certain non-stationary applications.

Loss from Operations

Loss from operations for the second quarter of 2017 was $245,857 compared to a loss of $386,030 for the same period in 2016, an improvement of $140,173. The improvement was due to increased revenues, including the addition of our energy production revenue stream. The loss for the second quarter of 2017 included one-time merger related expenses of $99,773 and depreciation and amortization expense on the energy producing sites of $178,595.

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Other Income (Expense), net

Other expense, net for the three months ended June 30, 2017 was $30,685 compared to $41,283 for the same period in 2016. Other income (expense) includes interest and other income of $7,397, and interest expense on notes payable of $38,082 for the second quarter of 2017. For the same period in 2016, interest and other income was $2,770 and interest expense was $44,053.

Noncontrolling Interest

The income attributable to the noncontrolling interest was $16,998 in the three months ended June 30, 2017 which represents the noncontrolling interest portion of American DG Energy's 51% owned subsidiary, ADGNY, LLC. For the same period in 2016, the loss attributable to the noncontrolling interest was $11,774 which was the result of the Company's ownership in its former partially owned subsidiary Ilios Inc.

Net Loss Attributable to Tecogen Inc

Net loss attributable to Tecogen for the three months ended June 30, 2017 was $293,540 compared to a loss of $415,539 for the same period in 2016, an improvement of $121,999. The improvement was the result of the Company's merger with American DG Energy in addition to 29.4% growth in product revenue and 12.9% growth in services revenue.

Other Comprehensive Loss

The unrealized loss on securities of $224,359 for the second quarter of 2017 represents a market fluctuation impacting the fair value of American DG Energy's remaining common stock ownership in its former partially owned subsidiary, EuroSite Power Inc. as of June 30, 2017.

First Six Months of 2017 Compared to First Six Months of 2016

Revenues

Total revenues for the first six months of 2017 were $14,437,305 compared to $10,762,823 for the same period in 2016, an increase of $3,674,482 or 34.1%.

Segment 1 - Product and Services

Product revenues in the first six months of 2017 were $5,923,543 compared to $4,675,008 for the same period in 2016, an increase of $1,248,535 or 26.7%. This increase was the net of an increase in cogeneration sales of $1,446,391 and a decrease in chiller and heat pump sales, which include the Ilios products, of $197,856. Service revenues in the first six months of 2017 were $7,739,570 compared to $6,087,815 for the same period in 2016, an increase of $1,651,755 or 27.1%. This increase in the first six months of 2017 is due to an increase in installation activity of $1,338,204 and an increase of $140,290 in service contract revenues.

Segment 2 - Energy Production

Energy production revenues in the first six months of 2017 were $774,192, which represents energy revenues earned from May 19, 2017, the date after acquisition of American DG Energy through June 30, 2017.

Cost of Sales

Cost of sales in the first six months of 2017 was $8,536,012 compared to $6,940,585 for the same period in 2016, an increase of $1,595,427, or 23.0%.

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TECOGEN INC.

Segment 1 - Product and Services

Cost of sales for product and services in the first six months of 2017 was $8,205,469 compared to $6,940,585 for the same period in 2016, an increase of $1,264,884 or 18.2%. During the first six months of 2017, our product and services gross margin was 39.9% compared to 35.5% for the same period in 2016, a 12.4% improvement. The increase in margin was a result of material cost savings in production and ongoing product development. Product gross margin for the first six months of 2017 was 37.2% compared to 29.0% for the same period in 2016, a 28.3% improvement. Service gross margin for the first six months of 2017 was 42.1% compared to 40.5%, an increase of 3.9% due to normal fluctuations in cost.

Segment 2 - Energy Production

Cost of sales for energy production in the first six months of 2017 was $330,543 which represents the cost associated with energy revenues earned from May 19, 2017, the date after acquisition of American DG Energy through June 30, 2017; this represents approximately 42% of the second quarter's revenue for American DG Energy. During this period our gross margin for energy production was 57.3%; higher than expected, due to seasonality and a retroactive rate change which reduced fuel costs.

Operating Expenses

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, 2017 were $4,615,148 compared to $3,894,392 for the same period in 2016, an increase of $720,756 or 18.5%. The increase was mainly due to a combination of merger costs as well as increased costs from the addition of American DG Energy's operations.

Selling expenses consist of sales staff, commissions, marketing, travel and other selling related expenses. Selling expenses for the six months ended June 30, 2017 were $1,054,963 compared to $850,121 for the same period in 2016, an increase of $204,842 or 24.1%. This difference is due to the mix of in-house sales versus representation commissions and increased public relations and trade show costs.

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, 2017 were $399,339 compared to $370,621 for the same period in 2016, an increase of $28,718 or 7.7%. This increase was due to the Company's cost sharing in connection with a research and development grant in process.

Loss from Operations

Loss from operations for the six months ended June 30, 2017 was $168,157 compared to a loss of $1,292,896 for the same period in 2016, an improvement of $1,124,739. The improvement was due to increased product and services revenues, as well as the addition of our energy production revenue stream. The loss for the six months ended June 30, 2017 included one-time merger related expenses of $118,853 and depreciation and amortization expense of $242,876.

Other Income (Expense), net

Other expense, net for the six months ended June 30, 2017 was $63,600 compared to $80,773 for the same period in 2016. Other income (expense) includes interest and other income of $6,184, and interest expense on notes payable of $69,784 for the six months ended June 30, 2017. For the same period in 2016, interest and other income was $5,661 and interest expense was $86,434.

Noncontrolling Interest

The income attributable to the noncontrolling interest was $16,998 for the six months ended June 30, 2017 which represents the noncontrolling interest portion of American DG Energy's 51% owned subsidiary, ADGNY, LLC. For the same period in 2016, the loss attributable to the noncontrolling interest was $64,962 which was the result of Tecogen's ownership in its former partially owned subsidiary Ilios Inc.

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TECOGEN INC.

Net Loss Attributable to Tecogen Inc

Net loss attributable to Tecogen for the six months ended June 30, 2017 was $248,755 compared to a loss of $1,308,707 for the same period in 2016, an improvement of $1,059,952. The improvement was the result of the Company's merger with American DG Energy in addition to 26.7% growth in product revenue and 27.1% growth in services revenue.

Other Comprehensive Loss

The unrealized loss on securities of $224,359 for the six months ended June 30, 2017 represents a market fluctuation impacting the fair value of American DG Energy's remaining common stock ownership in its former partially owned subsidiary, EuroSite Power Inc. as of June 30, 2017.

Liquidity and Capital Resources

Consolidated working capital at June 30, 2017 was $14,266,039 compared to $14,436,452 at December 31, 2016, a decrease of $170,413. Included in working capital were cash and cash equivalents of $3,317,928 at June 30, 2017, compared to $3,721,765 in cash and cash equivalents at December 31, 2016, a decrease of $403,837. The decrease in working capital and decrease in cash was the result of non-cash expense and income for the period.

Cash used in operating activities for the six months ended June 30, 2017 was $891,955 compared to $1,425,352 for the same period in 2016. Our accounts receivable balance increased to $8,868,157 at June 30, 2017 compared to $8,630,418 at December 31, 2016, using $355,740 of cash due to timing of billing, shipments, and collections. In addition, amounts due from related parties decreased by $118,612 providing cash due to timing of billing and collections. Our inventory increased to $6,099,770 as of June 30, 2017 compared to $4,774,264 as of December 31, 2016, an increase of $1,325,506. This increase is primarily due to the purchase of used equipment from American DG. Although lowering inventory is a goal, management expects inventory to vary significantly based on production and customer delivery requirements.

As of June 30, 2017, the Company's backlog of product and installation projects, excluding service contracts, was $14 million, consisting of $8 million of purchase orders received by us and $6 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.

Accounts payable increased to $4,501,662 as of June 30, 2017 from $3,367,481 at December 31, 2016, including $369,913 from the ADGE acquisition, providing $1,134,181, in cash flow from operations. Accrued expenses increased to $1,899,769 as of June 30, 2017, including $531,617 from the ADGE acquisition, from $1,378,258 as of December 31, 2016, providing $521,511 of cash from operations. The Company expects accounts payable and accrued expenses to fluctuate with routine changes in operations.

During the first six months of 2017, our investing activities provided $374,084 of cash and included the acquisition of American DG Energy cash through merger of $971,454, offset by purchases of property and equipment of $209,265, expenditures related to intangible assets of $22,539 and cash paid for certain expenses associated with the merger of $365,566.

During the first six months of 2017, our financing activities included $114,034 in proceeds from the exercise of stock options.

Significant Accounting Policies and Critical Estimates

The Company’s, and it's now wholly-owned subsidiary, American DG Energy Inc.'s significant accounting policies are discussed in the Notes to their respective Consolidated Financial Statements in their Annual Reports on Form 10-K. The accounting policies and estimates that can have a significant impact upon the operating results, financial position and footnote disclosures of the Company are described in the above notes and in the respective Annual Reports.

Significant New Accounting Standards or Updates Not Yet Effective

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.

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TECOGEN INC.

Seasonality

We expect that the majority of our heating systems sales will be in the winter and the majority of our chilling systems sales will be in the summer. Unreasonable weather may therefore have an effect on our revenues throughout the year. Our cogeneration and chiller system sales are not generally affected by the seasons, although customer goals will be to have chillers installed and running in the spring. Our service team does experience higher demand in the warmer months when cooling is required. These units are generally shut down in the winter and started up again in the spring. This “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.

Item 4. Controls and Procedures.

Management’s Evaluation of Disclosure Controls and Procedures:

The Company maintains "disclosure controls and procedures,” as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act, that are designed to provide reasonable assurance that information required to be disclosed by the Company in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms, and that such information is accumulated and communicated to the Company's management, including our principal executive officers and principal financial and accounting officer, as appropriate, 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 Co-Chief Executive Officers 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 material weaknesses with respect to a small number of individuals dealing with general controls over information technology and inadequate controls over revenue recognition with respect to the Company's recently acquired subsidiary, American DG Energy Inc. Management will continue to evaluate the above weaknesses, and as resources become available, the Company plans to take the necessary steps to remediate the weaknesses.

Changes in Internal Control over Financial Reporting:

During the second quarter of 2017 and in connection with the acquisition of American DG Energy Inc. the Company augmented its capabilities with respect to application and implementation of generally accepted accounting principles as it relates to complex transactions and the related financial reporting requirements through modifications to financial management including a new Chief Accounting Officer. Such modifications also included securing timely access to and involvement of individuals with a high level of training and expertise with respect to complex accounting and financial reporting matters.

PART II - OTHER INFORMATION

Item 1. Legal Proceedings

Massachusetts Superior Court Action

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TECOGEN INC.

United States District Court Action

On May 18, 2017, ADGE’s and Tecogen’s shareholders approved the Merger.

On July 19, 2017, defendants moved to dismiss the Amended Complaint. In their motion papers, defendants contend that the Federal Securities Law Claims are not sufficiently pleaded and fail to state a viable claim. Defendants also assert that if the Federal Securities Law Claims are dismissed, the district court must also dismiss the State Law Claims because it would lack subject matter jurisdiction. Plaintiff’s deadline to respond to the motion is August 18, 2017 and defendants will file a reply brief on September 8, 2017.

Except as set forth above, as of the date of this filing the Company is currently not a party to any legal or administrative proceedings material to the Company's financial statements and is not aware of any pending or threatened legal or administrative proceeding that is material to the Company's financial statement.

Item 1A. Risk Factors

Our business, operations and the Company face many risks. In connection with the Company's acquisition of ADGE on May 18, 2017, there were changes to these risk. To reflect this change, the Company is amending its list of risk factors discussed in its Annual Report on Form 10-K for the fiscal year ended December 31, 2016 by adding the risk factors listed below. In addition to the risk factors and other information set forth in this report, you should carefully consider the factors discussed under “Risk Factors” in our Annual Report on Form 10-K for our fiscal year ended December 31, 2016. The risks described below may not be the only risks we face as a result of acquiring ADGE. Additional risks that we do not yet know of, or that we currently think are immaterial, may also impair our business operations or financial results. If any of the events or circumstances described in the following risks occur, our business, financial condition or results of operations could suffer and the trading price of our common stock could decline. Investors and prospective investors should consider the following risks and the information contained under the heading ''Cautionary Note Concerning Forward-Looking Statements'' before deciding whether to invest in our securities.

In addition to the risk factors and other information set forth in this report, you should carefully consider the factors discussed under “Risk Factors” in our Annual Report on Form 10-K for our fiscal year ended December 31, 2016. The risks discussed in our Annual Report on Form 10-K could materially affect our business, financial condition and future results. The risks described in our Annual Report on Form 10-K are not the only risks facing us. 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.

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TECOGEN INC.

1. Through ADGE, we may be exposed to substantial liability claims if we fail to fulfill our obligations to our customers or our on-site equipment malfunctions.

Through ADGE, we enter into contracts with large commercial and not-for-profit customers under which we assume responsibility for meeting a portion of the customers' building energy demand and equipment installation. We may be exposed to substantial liability claims if we fail to fulfill our obligations to customers or if the equipment malfunctions. There can be no assurance that we will not be vulnerable to claims by customers and by third parties that are beyond any contractual protections that we are able to negotiate. As a result, liability claims could cause us significant financial harm.

2. Expiring ADGE customer contracts may lead to decreases in revenue and increases in expenses.

This decrease in energy revenue will be due to less energy billing. Expiring customer contracts can also lead to an increase in expenses because we will have to remove the equipment at the customer location. We will remove the equipment at our own expense and are obligated to do so at the end of the customer contract. Each year, a portion of our customers contracts expire and need to be renewed or replaced. We may not be able to renew or extend contracts with existing customers or obtain replacement contracts at attractive rates or for the same term as the expiring contracts.

3. ADGE revenue from energy billing is partly dependent on the weather and increased temperatures could reduce our revenue.

In warmer months the customers are not using as much thermal energy as they do not have as much of a demand to heat their locations. Due to the demand being lower in warmer months we may not be able to bill for thermal energy and in turn may have a decrease in revenue.

4. The reduction, elimination or expiration of government subsidies and economic incentives for applications of our equipment could reduce demand for our equipment and harm our business.

The market for cogeneration equipment depends in part on the availability and size of government and economic incentives that vary by geographic market. Because our customers’ sales are typically into geographic areas with such incentives, elimination or expiration of government subsidies and economic incentives for cogeneration equipment may negatively affect the competitiveness of equipment relative to other sources of electricity, heating, and cooling equipment, and could harm or halt the growth of the cogeneration industry and our business. In particular, the Company depends on the New York State Energy Development Authority CHP Program (PON 2568) and the New Jersey Smart Start Combined Heat and Power Incentive.

These government incentives expire, phase out over time, terminate upon the exhaustion of the allocated funding, require renewal by the applicable authority or are being changed by governments due to changing market circumstances or changes to national, state or local energy policy.

Competing sources of electricity, heating, and cooling equipment may successfully lobby for changes in the relevant legislation in their markets that are harmful to the cogeneration industry. Reductions in, or eliminations or expirations of, governmental incentives in regions that we focus our sales efforts could result in decreased demand for and lower revenue from cogeneration equipment there, which would adversely affect the Company. In addition, our ability to successfully penetrate new geographic markets may depend on new geographic areas adopting and maintaining incentives to promote cogeneration, to the extent such incentives are not currently in place. Additionally, electric utility companies may establish pricing structures or interconnection requirements that could adversely affect our sales and be harmful to cogeneration.

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TECOGEN INC.

Item 6. Exhibits



Exhibit No.	Description of Exhibit
2.1	Agreement and Plan of Merger, dated November 1, 2016, among the Company, Tecogen, Inc. and Tecogen.ADGE Acquisition Corp.^(k)
2.2	Amendment 1 to the Agreement and Plan of Merger, dated as of March 23, 2017, by and among registrant, American DG Energy Inc. and Tecogen.ADGE Acquisition Corp.^(k)
3.1	Amended and Restated Certificate of Incorporation.^(a)
3.2	Amended and Restated Bylaws.^(a)
4.1	Specimen Stock Certificate of Tecogen, Inc. ^(a)
4.2	Form of Restricted Stock Purchase Agreement.^(b)
4.3+	Form of Stock Option Agreement.^(a)
4.5	Warrant to Subscribe for Shares between Ultra Emissions Technology, Ltd and registrant.^(m)
4.6	Tecogen Ultratek Warrant signed August 2, 2016.^(j)
10.1	Form of Line of Credit Agreement Between American DG Energy and Mr. John Hatsopoulos, dated December 22, 2016 ^(p)
10.8	Second Amendment to Lease between Atlantic-Waltham Investment II, LLC dated Jan 16, 2013.^(a)
10.21	Senior Convertible Promissory Note, dated December 23, 2013, by Tecogen Inc. in favor of Michaelson Capital Special Finance Fund LP. ^(a)
10.26	Tecogen 2006 Stock Incentive Plan, as amended on January 24, 2014 with stockholder approval on July 15, 2014.^(e)
10.27	Non-Revolving Line of Credit Agreement between the Company and John N. Hatsopoulos, dated June 15, 2015.^(e)
10.31	Joint Venture Shareholder Agreement between Tecogen Inc. and Ultra Emissions Technology Limited, dated December 28, 2015 ⁽ⁿ⁾
10.32	License Agreement between Tecogen Inc. and Ultra Emissions Technology Limited, dated December 28, 2015 ⁽ⁿ⁾
10.33	Form of Subscription Agreement between Tecogen and the several investors purchasing shares of Tecogen Common Stock and Warrants, dated December 28, 2015 ⁽ⁿ⁾
10.34	Form of Warrants issued pursuant to the Subscription Agreement described in Exhibit 10.33 hereto ⁽ⁿ⁾
10.35	Form of Share Exchange Agreement between Tecogen and certain shareholders of Ilios Inc., dated April 11, 2016 and April 13, 2016 ^(o)
10.36	Amendment No. 1 to the Senior Convertible Promissory Note effective April 1, 2016.^(g)
10.37	Tedom Joint Venture Agreement dated May 19, 2016. ^(h)
10.38	Tedom Joint Venture LLC Agreement dated May 19, 2016. ^(h)
10.39	Form of a Warrant Amendment dated June 27, 2016.⁽ⁱ⁾
10.40+	Employment Agreement dated December 1, 2016 between registrant and David A. Garrison. ^(l)
21.1	List of Subsidiaries. ^(k)
31.1*	Rule 13a-14(a) Certification of Co-Chief Executive Officer
31.2*	Rule 13a-14(a) Certification of Co-Chief Executive Officer
31.3*	Rule 13a-14(a) Certification of Chief Accounting Officer
32.1*	Section 1350 Certifications of Co-Chief Executive Officers and Chief Accounting Officer
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

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TECOGEN INC.


^(a)	incorporated by reference from the Company's Registration Statement on Form S-1/A (Registration No. 333-193791), filed with the SEC on June 27, 2014.


^(b)	incorporated by reference from the Company's Registration Statement on Form S-1 (Registration No. 333-178697), originally filed with the SEC on December 22, 2011.


^(c)	incorporated by reference from the Company's 10-Q Report for the period ending June 30, 2014, originally filed with the SEC on August 14, 2014.


^(d)	incorporated by reference from the Company's form 8-K Report originally filed with the SEC on August 6, 2015.


^(e)	incorporated by reference from the Company's 10-Q Report for the period ending June 30, 2015, originally filed with the SEC on August 6, 2015.


^(f)	incorporated by reference from the Company's form 8-K Report originally filed with the SEC on August 13, 2015.


^(g)	incorporated by reference from the Company's form 8-K Reports originally filed with the SEC on April 15, 2016.


^(h)	incorporated by reference from the Company's form 8-K Reports originally filed with the SEC on May 24, 2016.


⁽ⁱ⁾	incorporated by reference from the Company's form 8-K Reports originally filed with the SEC on June 30, 2016.


^(j)	incorporated by reference from the Company's form 8-K Reports originally filed with the SEC on August 8, 2016.


^(k)	incorporated by reference from the Company's Registration Statement on Form S-4 (Registration No. 333-215231), as amended, originally filed with the SEC on December 21, 2016.


^(l)	incorporated by reference from the Company's form 8-K Reports originally filed with the SEC on December 2, 2016.


^(m)	Incorporated by reference to the registrant's Annual Report on Form 10-K, as filed with the SEC on March 29, 2016.


⁽ⁿ⁾	Incorporated by reference from the Company's form 8-K Reports originally filed with the SEC on December 31, 2015.


^(o)	Incorporated by reference from the Company's form 8-K Reports originally filed with the SEC on April 15, 2016.


^(p)	Incorporated by reference from American DG Energy's form 8-K Reports originally filed with the SEC on December 28, 2016.

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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, on August 14, 2017.



	TECOGEN INC.
	(Registrant)

	By:	/s/ John N. Hatsopoulos
	Co-Chief Executive Officer
	(Principal Executive Officer)

	By:	/s/ Benjamin M. Locke
	Co-Chief Executive Officer
	(Principal Executive Officer)

	By:	/s/ Bonnie J. Brown
	Chief Financial Officer, Treasurer and Secretary
	(Principal Accounting Officer)

Document and Entity Information Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	TECOGEN INC.
Entity Central Index Key	0001537435
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		24,714,989

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
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	24,711,989	19,981,912
Common stock, shares outstanding	24,711,989	19,981,912

Description of business and basis of presentation	6 Months Ended
Description of business and basis of presentation	Jun. 30, 2017
Accounting Policies [Abstract]
Description of business and basis of presentation	Description of Business and Basis of Presentation Description of business Tecogen Inc., or the Company, we, our or us produces commercial and industrial, natural-gas-fueled engine-driven, combined heat and power (CHP) products that reduce energy costs, decrease greenhouse gas emissions and alleviate congestion on the national power grid. The Company’s products supply electric power or mechanical power for cooling, while heat from the engine is recovered and purposefully used at a facility. The Company also installs, owns, operates and maintains complete energy systems and other complementary systems at customer sites and sells 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 the Company’s customers are located in regions with the highest utility rates, typically California, the Midwest and the Northeast. The Company's common stock is listed on the NASDAQ under the ticker 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 (see Note 3. "Acquisition of American DG Energy Inc."). 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 of 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, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. The condensed consolidated balance sheet at December 31, 2016 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 Inc.'s Annual Report on Form 10-K and American DG Energy Inc.'s Annual Report on Form 10-K for the year ended December 31, 2016. There have been no significant changes in accounting principles, practices or methods for making estimates. The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and entities in which it has a controlling financial interest. Those entities include the Company's wholly-owned subsidiaries American DG Energy Inc. and Ilios Inc. and a joint venture, American DG New York, LLC, in which American DG Energy Inc. holds a 51.0% interest. Investments in partnerships and companies in which the Company does not have a controlling financial interest but where we have significant influence are accounted for under the equity method. The Company’s 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. Significant New Accounting Standards or Updates Not Yet Effective Revenue Recognition In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standard update related to revenue from contracts with customers, which, along with amendments issued in 2015 and 2016, will supersede nearly all current U.S. GAAP guidance on this topic and eliminate industry-specific guidance. The underlying principle is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. This accounting standard update, as amended, will be effective for the Company beginning in the first quarter of fiscal 2018. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized in retained earnings as of the date of adoption ("modified retrospective basis"). The Company expects to adopt this accounting standard update on a modified retrospective basis in the first quarter of fiscal 2018, and it is currently evaluating the impact of this accounting standard update on its consolidated financial statements. Leases In February 2016, the FASB issued an accounting standard update related to leases requiring lessees to recognize operating and financing lease liabilities on the balance sheet, as well as corresponding right-of-use assets. The new lease standard also makes some changes to lessor accounting and aligns key aspects of the lessor accounting model with the revenue recognition standard. In addition, disclosures will be required to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2019 on a modified retrospective basis, and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

Commitments and contingencies	6 Months Ended
Commitments and contingencies	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and Contingencies The Company guarantees certain obligations of a former subsidiary of American DG Energy, EuroSite Power 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, 2017 of approximately $310,000 due ratably in equal installments through September 2021, and certain guarantees of performance in respect of certain customer contracts. Based on current conditions, the Company does not believe there to be any amounts probable of payment by the Company under any of the guarantees and has estimated the value associated with the non-contingent aspect of the guarantees is approximately $10,000 which is recorded as liability in the accompanying financial statements. Legal Proceedings Tecogen is not currently a party to any material litigation arising from its operations, and it is not aware of any pending or threatened litigation against it relating to its operations that could have a material adverse effect on its business, operating results or financial condition. However, it is or has been a party to a claim in the Superior Court of the Commonwealth of Massachusetts and named as a defendant in a case in the United States District Court for the District of Massachusetts, described below, related to the Merger. Massachusetts Superior Court Action On or about February 6, 2017, ADGE, John Hatsopoulos, George N. Hatsopoulos, Charles T. Maxwell, Deanna M. Petersen, Christine Klaskin, John Rowe, Joan Giacinti, Elias Samaras, Tecogen, and Merger Sub were served with a Verified Complaint by William C. May ("May"), individually and on behalf of the other shareholders of ADGE as a class. The action was commenced in the Business Litigation Session of the Superior Court of the Commonwealth of Massachusetts, Civil Action No. 17-0390. The complaint alleged class action claims arising out of the proposed Merger. On May 31, 2017, May voluntarily dismissed the action and consolidated his claims with the pending federal action in the United States District Court for the District of Massachusetts. If the complaint in the federal court is dismissed, it is possible that May or another plaintiff will recommence an action in state court with similar claims to those asserted by May. United States District Court Action On or about February 15, 2017, a lawsuit was filed in the United States District Court for the District of Massachusetts by Lee Vardakas (“Vardakas”), individually and on behalf of other stockholders of ADGE, naming ADGE, John N. Hatsopoulos, George N. Hatsopoulos, Benjamin Locke, Charles T. Maxwell, Deanne M. Petersen, Christine M. Klaskin, John Rowe, Joan Giacinti, Elias Samaras, Tecogen., Merger Sub., and Cassel Salpeter and Co., LLC, as defendants. The action is captioned Vardakas v. American DG Energy, Inc., Case No. 17-CV-10247(LTS). At the time Vardakas commenced the action, his complaint challenged the proposed Merger between Tecogen and ADGE. On May 18, 2017, ADGE’s and Tecogen’s shareholders approved the Merger. Following the consummation of the Merger (and the appointment of May, from the Massachusetts Superior Court Action, as lead plaintiff), Vardakas filed an Amended Class Action Complaint (the “Amended Complaint”). The Amended Complaint discontinued the claims against Cassel Salpeter & Co., LLC but asserted against the remaining defendants claims under Section 14(a) of the Securities Exchange Act of 1934 (the “Exchange Act”) and SEC Rule 14a-9; claims against certain defendants for control person liability under § 20(a) of the Exchange Act (collectively, the “Federal Securities Law Claims”); and common law claims for breach of fiduciary duty and aiding and abetting (the “State Law Claims”). The Federal Securities Law Claims allege, in substance, that defendants made material nondisclosure in the proxy statement about the process leading to the merger and about the fairness opinion relied upon by ADGE’s Board of Directors in recommending the Merger to shareholders. The State Law Claims assert, in substance, that defendants breached their fiduciary duties in negotiating and approving the merger, which, plaintiff claims, deprived ADGE’s nonaffiliated shareholders of fair value for their shares. On July 19, 2017, defendants moved to dismiss the Amended Complaint. In their motion papers, defendants contend that the Federal Securities Law Claims are not sufficiently pleaded and fail to state a viable claim. Defendants also assert that if the Federal Securities Law Claims are dismissed, the district court must also dismiss the State Law Claims because it would lack subject matter jurisdiction. Plaintiff’s deadline to respond to the motion is August 18, 2017 and defendants will file a reply brief on September 8, 2017. The Company believes that the lawsuit is without merit and intends to defend vigorously. The Amended Complaint does not specify the amount of damages claimed and any estimate by the Company would be unduly speculative.

Related party transactions	6 Months Ended
Related party transactions	Jun. 30, 2017
Related Party Transactions [Abstract]
Related party transactions	Related Party Transactions The Company has two affiliated companies, namely Ultra Emissions Technologies Ltd, and TTcogen LLC. These companies are related because either several of the major stockholders of those companies, have a significant ownership position in the Company or they are joint ventures between Tecogen and other parties. In January of 2017, prior to its acquisition of American DG Energy, the Company purchased a large quantity of used equipment from American DG Energy for approximately $985,000. Tecogen plans to sell this equipment to specific customers in the coming quarters. In connection with the acquisition of American DG Energy, the Company assumed a loan from John N. Hatsopoulos, the Company's Co-Chief Executive Officer and a Company Director. The loan is in the amount of $850,000 and bears interest at 6%, payable quarterly, and matures and becomes due and payable on May 25, 2018. Ultra Emissions Technologies Ltd. On December 28, 2015, the Company entered into a joint venture agreement relating to the formation of a joint venture company (the “JV”) organized to develop and commercialize Tecogen’s patented technology (“Ultera^® Technology”) designed to reduce harmful emissions generated by engines using fossil fuels. The joint venture company, called Ultra Emissions Technologies Limited, was organized under the laws of the Island of Jersey, Channel Islands. The Company received a 50% equity interest in the JV in exchange for a fully paid-up worldwide license to use Tecogen’s Ultera emissions control technology in the field of mobile vehicles burning fossil fuels. The other half of the joint venture equity interests were purchased for $3,000,000 by a small group of offshore investors. Warrants to purchase additional equity securities in the JV were granted to all parties pro rata. If the venture is not successful, all licensed intellectual property rights will revert to Tecogen. On August 2, 2016, Tecogen exercised 2,000,000 warrants (the "Ultratek Warrants"), in the JV, at $1.00 per share, for an aggregate amount of $2 million. The funds used to exercise the Ultratek Warrants were acquired by the Company from the holders of certain Company warrants (the "Tecogen Warrant Holders"), when they partially exercised their Tecogen warrants (the "Tecogen Warrants"), in July of 2016. The Tecogen Warrant Holders exercised a total of 675,000 Tecogen Warrants with a $4.00 exercise price, resulting in cash proceeds of $2,700,000 to the Company, which the Company then used in part to invest in the JV. An additional $8,500,000 was raised from other outside investors for a total equity investment in the JV to date of $13,500,000. Due to this investment, Tecogen's ownership has decreased to 43%. The JV is expected to have losses as it performs the necessary research and development with the Ultera technology. The Company accounts for its interest in the JV using the equity method. Income and losses will be recorded consistent with an agreement between the JV shareholders as to how income and losses will be allocated. These allocations are consistent with the allocation of cash distributions and liquidating distributions of the JV. The shareholder agreement calls for Tecogen's investment to be returned before any other shareholder if the venture does not achieve commercialization. As a result, as of June 30, 2017, Tecogen has not recorded any of the losses of the JV as the cumulative losses of the JV have not exceeded the other owners' investments to date. As of June 30, 2017, $94,407 is due to Tecogen from Ultratek. TTcogen LLC On May 19, 2016, the Company along with Tedom a.s., a corporation incorporated in the Czech Republic and a European combined heat and power product manufacture ("Tedom"), entered into a joint venture, where the Company will hold a 50% participating interest and the remaining 50% interest will be with Tedom. As part of the joint venture, the parties agreed to create a Delaware limited liability company, TTcogen LLC ("TTcogen"), to carry out the business of the venture. Tedom granted TTcogen the sole and exclusive right to market, sell, offer for sale, and distribute certain products as agreed to by the parties throughout the United States. The product offerings of the joint venture expand the current Tecogen product offerings to the MicroCHP of 35kW to large 4,000kW plants. Tecogen agreed to refer all appropriate sale leads to TTcogen regarding the products agreed to by the parties and Tecogen shall have the first right to repair and maintain the products sold by TTcogen. The Company accounts for its interest in TTcogen's operations using equity method accounting. Any initial operating losses of TTcogen are to be borne and funded by Tedom. To the extent any such losses are borne and funded solely by Tedom, the Company will not recognize any portion of such losses given the Company does not guarantee the obligations of the joint venture nor is it committed to provide funding to the joint venture. As of period ending June 30, 2017, $279,069 is due to Tecogen from TTcogen.


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.


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.


1.	The Quarterly Report on Form 10-Q of the Company for the quarter ended June 30, 2017 (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.

Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 3,317,928	$ 3,721,765
Accounts receivable, net	8,868,157	8,630,418
Unbilled revenue	3,239,588	2,269,645
Inventory, net	6,099,770	4,774,264
Due from related party	378,296	260,988
Prepaid and other current assets	823,629	401,876
Total current assets	22,727,368	20,058,956
Property, plant and equipment, net	15,725,008	517,143
Intangible assets, net	2,098,484	1,065,967
Excess of cost over fair value of net assets acquired	12,570,809	0
Goodwill	40,870	40,870
Other assets	2,423,510	2,058,425
TOTAL ASSETS	55,586,049	23,741,361
Current liabilities:
Accounts payable	4,501,662	3,367,481
Accrued expenses	1,899,769	1,378,258
Deferred revenue	1,183,350	876,765
Loan due to related party	850,000	0
Interest payable, related party	26,548	0
Total current liabilities	8,461,329	5,622,504
Long-term liabilities:
Deferred revenue, net of current portion	449,741	459,275
Senior convertible promissory note, related party	3,148,898	3,148,509
Unfavorable contract liability	10,304,451	0
Total liabilities	22,364,419	9,230,288
Commitments and contingencies
Tecogen Inc. shareholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 24,711,989 and 19,981,912 issued and outstanding at June 30, 2017 and December 31, 2016, respectively	24,712	19,982
Additional paid-in capital	56,027,038	37,334,773
Accumulated other comprehensive loss-investment securities	(224,359)	0
Accumulated deficit	(23,092,431)	(22,843,682)
Total Tecogen Inc. stockholders’ equity	32,734,960	14,511,073
Noncontrolling interest	486,670	0
Total stockholders’ equity	33,221,630	14,511,073
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 55,586,049	$ 23,741,361

Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Products	$ 3,116,198	$ 2,408,860	$ 5,923,543	$ 4,675,008
Services	3,700,150	3,278,448	7,739,570	6,087,815
Energy production	774,192	0	774,192	0
Total revenues	7,590,540	5,687,308	14,437,305	10,762,823
Cost of sales
Products	1,965,881	1,767,052	3,722,730	3,319,768
Services	2,307,494	1,817,362	4,482,739	3,620,817
Energy production	330,543	0	330,543	0
Total cost of sales	4,603,918	3,584,414	8,536,012	6,940,585
Gross profit	2,986,622	2,102,894	5,901,293	3,822,238
Operating expenses
General and administrative	2,406,244	2,002,172	4,615,148	3,894,392
Selling	607,511	335,089	1,054,963	850,121
Research and development	218,724	151,663	399,339	370,621
Total operating expenses	3,232,479	2,488,924	6,069,450	5,115,134
Loss from operations	(245,857)	(386,030)	(168,157)	(1,292,896)
Other income (expense)
Interest and other income	7,397	2,770	6,184	5,661
Interest expense	(38,082)	(44,053)	(69,784)	(86,434)
Total other expense, net	(30,685)	(41,283)	(63,600)	(80,773)
Consolidated net loss	(276,542)	(427,313)	(231,757)	(1,373,669)
(Income) loss attributable to the noncontrolling interest	(16,998)	11,774	(16,998)	64,962
Net loss attributable to Tecogen Inc.	(293,540)	(415,539)	(248,755)	(1,308,707)
Other comprehensive loss - unrealized loss on securities	(224,359)	0.00	(224,359)	0
Comprehensive loss	$ (517,899)	$ (415,539)	$ (473,114)	$ (1,308,707)
Net loss per share - basic and diluted (usd per share)	$ (0.01)	$ (0.02)	$ (0.01)	$ (0.07)
Weighted average shares outstanding - basic and diluted (shares)	23,120,351	19,088,828	21,587,589	18,783,909

Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net loss	$ (231,757)	$ (1,373,669)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	242,876	131,941
Provision (recovery) of inventory reserve	25,609	(40,000)
Stock-based compensation	97,684	88,177
Non-cash interest expense	389	23,050
Loss on sale of assets	2,909	640
Provision for losses on accounts receivable	1,335	0
Changes in operating assets and liabilities, net of effects of acquisitions
Short term investments	0	294,802
Accounts receivable	355,740	(954,191)
Unbilled revenue	(952,864)	(141,827)
Inventory, net	(1,242,782)	782,728
Due from related party	(118,612)	785,818
Prepaid expenses and other current assets	(99,601)	(134,033)
Other non-current assets	65,687	0
Increase (decrease) in:
Accounts payable	786,419	(693,524)
Accrued expenses and other current liabilities	(10,362)	(30,078)
Deferred revenue	176,852	(165,186)
Interest payable, related party	8,523	0
Net cash used in operating activities	(891,955)	(1,425,352)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(209,265)	(100,925)
Purchases of intangible assets	(22,539)	(50,970)
Cash acquired in acquisition	971,454
Payment of stock issuance costs	(365,566)
Net cash provided by (used in) investing activities	374,084	(151,895)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from demand notes payable, related party	0	150,000
Payment of stock issuance costs	0	(8,544)
Proceeds from the exercise of stock options	114,034	18,925
Net cash provided by financing activities	114,034	160,381
Net decrease in cash and cash equivalents	(403,837)	(1,416,866)
Cash and cash equivalents, beginning of the period	3,721,765	5,486,526
Cash and cash equivalents, end of the period	3,317,928
Non-cash investing and financing activities:
Cash paid for interest	0	72,199
Exchange of stock for non-controlling interest in Ilios	0	330,852
Issuance of stock to acquire American DG Energy	18,745,007	0
Issuance of Tecogen stock options in exchange for American DG Energy options	$ 114,896	$ 0

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated subsequent events through the date of this filing and determined that no subsequent events occurred that would require recognition in the consolidated financial statements or disclosure in the notes thereto.

Description of business and basis of presentation (Policies)	6 Months Ended
	Jun. 30, 2017
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 of 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, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. The condensed consolidated balance sheet at December 31, 2016 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 Inc.'s Annual Report on Form 10-K and American DG Energy Inc.'s Annual Report on Form 10-K for the year ended December 31, 2016. There have been no significant changes in accounting principles, practices or methods for making estimates. The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and entities in which it has a controlling financial interest. Those entities include the Company's wholly-owned subsidiaries American DG Energy Inc. and Ilios Inc. and a joint venture, American DG New York, LLC, in which American DG Energy Inc. holds a 51.0% interest. Investments in partnerships and companies in which the Company does not have a controlling financial interest but where we have significant influence are accounted for under the equity method. The Company’s 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 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	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.

Description of business and basis of presentation - Additional Information (Details)	May 18, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Ownerhsip interest in American DG New York, LLC (percent)		51.00%
American DG Energy, Inc.
Business Acquisition [Line Items]
Ownership interest (percent)	100.00%

Acquisition of American DG Energy, Inc. - Additional information (Details)		3 Months Ended			6 Months Ended
	May 18, 2017 shares	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Business Acquisition [Line Items]
Excess of Cost over Fair Value of Net Assets Acquired					$ 0
Energy production revenue		$ 774,192	$ 0		774,192	$ 0
Gross profit		2,986,622	$ 2,102,894		5,901,293	$ 3,822,238
Payment of stock issuance costs				$ 0	(365,566)
Shares issued in acquisition (shares) \| shares	4,662,937
Discount rate used to calculate fair value of noncontrolling interest (percent)	5.61%
General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related costs		99,773			118,853
American DG Energy, Inc.
Business Acquisition [Line Items]
Ownership interest (percent)	100.00%
Energy production revenue		1,047,882
Gross profit		$ 469,075			$ 443,649
Common Stock [Member]
Business Acquisition [Line Items]
Conversion ratio of American DG shares to Tecogen shares	0.092

Acquisition of American DG Energy, Inc. - Consideration, and Assets and Liabilities Assumed (Details) - USD ($)		6 Months Ended
	May 18, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Tecogen common stock - 4,662,937 shares		$ 18,745,007	$ 0
Assumed fully vested equity awards		114,896	$ 0
Recognized amounts of identifiable assets acquired and liabilities assumed
Financial liabilities		(10,304,451)		$ 0
Noncontrolling interest		486,670		0
Excess of cost over fair value of net assets acquired		$ 12,570,809		$ 0
American DG Energy, Inc.
Business Acquisition [Line Items]
Tecogen common stock - 4,662,937 shares	$ 18,745,007
Assumed fully vested equity awards	114,896
Equity consideration	18,859,903
Recognized amounts of identifiable assets acquired and liabilities assumed
Financial assets	1,583,190
Inventory	108,333
Prepaid and other current assets	358,628
Property, plant and equipment	15,430,250
Investment securities	519,568
Identifiable intangibles assets	1,456,166
Financial liabilities	(1,857,859)
Unfavorable contract liability	(10,838,571)
Other liabilities	(939)
Total identifiable net assets	6,758,766
Noncontrolling interest	(469,672)
Excess of cost over fair value of net assets acquired	12,570,809
Consideration transferred	$ 18,859,903

Property, Plant and Equipment - Summary of Property and Equipment (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,739,434	$ 1,691,523
Less - accumulated depreciation and amortization	(1,591,488)	(1,174,380)
Property and equipment, net, before construction in progress	13,147,946	517,143
Construction in progress	2,577,062	0
Property and equipment, net	15,725,008	517,143
Energy systems
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,883,503	0
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	$ 1,121,289	1,009,893
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	$ 103,971	141,874
Useful life - years	5 years
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 190,152	102,415
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	$ 440,519	$ 437,341

Intangible assets and liabilities other than goodwill and excess of cost over fair value of net assets acquired -Amounts related to intangible assets (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 2,576,606	$ 1,482,971
Less - accumulated amortization	(478,122)	(417,004)
Intangible assets, net	2,098,484	1,065,967
Unfavorable contract liability	10,453,501	0
Less - accumulated amortization	(149,050)	0
Unfavorable contract liability, net	10,304,451	0
Product Certifications
Finite-Lived Intangible Assets [Line Items]
Intangible assets	598,264	544,651
Less - accumulated amortization	(259,667)	(233,992)
Intangible assets, net	338,597	310,659
Patents
Finite-Lived Intangible Assets [Line Items]
Intangible assets	649,081	681,155
Less - accumulated amortization	(138,992)	(123,012)
Intangible assets, net	510,089	558,143
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets	240,000	240,000
Less - accumulated amortization	(68,000)	(60,000)
Intangible assets, net	172,000	180,000
Favorable contract asset
Finite-Lived Intangible Assets [Line Items]
Intangible assets	1,071,096	0
Less - accumulated amortization	(11,463)	0
Intangible assets, net	1,059,633	0
Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets	18,165	17,165
Less - accumulated amortization	0	0
Intangible assets, net	$ 18,165	$ 17,165

Intangible assets and liabilities other than goodwill and excess of cost over fair value of net assets acquired - Future Amortization of Customer Contracts (Details) - Customer Contracts	Jun. 30, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Year 1	$ (1,056,338)
Year 2	(914,783)
Year 3	(826,089)
Year 4	(839,851)
Year 5	$ (840,519)

Goodwill and Excess Cost over Fair Value of Net Assets Acquired (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning	$ 40,870
Acquisitions	0
Goodwill, ending	40,870
Excess of cost over fair value of net assets acquired	12,570,809	$ 0
Acquisitions	12,570,809
Excess of Cost over Fair Value of Net Assets Acquired	$ 12,570,809

Stock-based compensation - Stock-Based Compensation (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 97,684	$ 88,177
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
Number of shares remaining available for future issuance	2,190,174

Stock-based compensation - Stock Option Activity (Details) - Tecogen - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Stock Options Outstanding [Roll Forward]
Beginning (shares)	1,117,918
Granted (shares)	3,000
Assumed in merger (shares)	156,124
Exercised (shares)	(67,140)
Canceled and forfeited (shares)	(3,750)
Ending (shares)	1,206,152	1,117,918
Exercisable (shares)	951,402
Vested and expected to vest (shares)	1,167,940
Exercise Price Per Share [Abstract]
Exercise Price Per Share, Outstanding, Minimum (per share)	$ 0.79	$ 0.79
Exercise Price Per Share, Outstanding, Maximum (dollars per share)	30.33	5.39
Exercise Price Per Share, Granted (dollars per share)	3.72
Exercise Price, Canceled and Forfeited (dollars per share)	2.60
Weighted Average Exercise Price [Roll Forward]
Beginning (usd per share)	3.10
Granted (usd per share)	3.72
Assumed in merger (usd per share)	10.35
Exercised (usd per share)	1.70
Canceled and forfeited (usd per share)	2.60
Ending (usd per share)	4.14	$ 3.10
Exercisable (usd per share)	4.04
Vested and expected to vest (usd per share)	$ 4.13
Weighted Average Remaining Life	4 years 11 months 27 days	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding, Aggregate Intrinsic Value	$ 712,102	$ 1,415,150
Exercisable, Aggregate Intrinsic Value	712,102
Vested and expected to vest, Aggregate Intrinsic Value	$ 712,102
Minimum
Exercise Price Per Share [Abstract]
Exercise Price, Assumed in Merger (dollars per share)	$ 3.15
Exercise Price Per Share, Exercised (dollars per share)	0.79
Maximum
Exercise Price Per Share [Abstract]
Exercise Price, Assumed in Merger (dollars per share)	30.33
Exercise Price Per Share, Exercised (dollars per share)	$ 2.00

Fair Value Measurements - Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)	1 Months Ended
	Jun. 30, 2017	May 18, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses)	$ (224,359)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	295,209
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	295,209
Eurosite Power Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses)	(224,359)
Eurosite Power Inc \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	0
Eurosite Power Inc \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	0
Eurosite Power Inc \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	295,209	$ 519,568
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	$ 295,209

Fair Value Measurements - Change in Level 3 Assets (Details) - Fair Value, Measurements, Recurring	1 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) trading_day
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value at June 30, 2017	$ (224,359)
Eurosite Power Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value at June 30, 2017	(224,359)
Eurosite Power Inc \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of trading days included in fair value measurement \| trading_day		15
Unrealized loss recognized in other comprehensive loss	$ 295,209	$ 295,209

Commitments and contingencies Commitments and Contingencies (Details)	Jun. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Guarantee of obligations of Eurosite Power, Inc.	$ 310,000
Guarantee liability	$ 10,000

Related party transactions (Details)		1 Months Ended		6 Months Ended
Related party transactions (Details)	Aug. 02, 2016 USD ($) $ / shares shares	Jan. 31, 2017 USD ($)	Jul. 31, 2016 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) company	May 19, 2016	Dec. 28, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of affiliated companies \| company				2
Equity interest in joint venture (percent)				43.00%
Warrant exercise price (per share) \| $ / shares			$ 4.00
Proceeds from the exercise of warrants			$ 2,700,000
Investments in joint venture				$ 13,500,000
Ultra Emissions Technology Ltd.
Schedule of Equity Method Investments [Line Items]
Equity interest in joint venture (percent)						50.00%
Warrants exercised for investment in joint venture	$ 2,000,000
Due from affiliate				94,407
TTcogen, LLC
Schedule of Equity Method Investments [Line Items]
Equity interest in joint venture (percent)					50.00%
Due from affiliate				279,069
Offshore Investors
Schedule of Equity Method Investments [Line Items]
Investment by other party to joint venture						$ 3,000,000
Tedom a.s.
Schedule of Equity Method Investments [Line Items]
Equity interest in joint venture (percent)					50.00%
Warrant
Schedule of Equity Method Investments [Line Items]
Warrants exercised (shares) \| shares			675,000
Warrant \| Ultra Emissions Technology Ltd.
Schedule of Equity Method Investments [Line Items]
Warrants exercised (shares) \| shares	2,000,000
Warrant exercise price (per share) \| $ / shares	$ 1.00
American DG Energy
Schedule of Equity Method Investments [Line Items]
Equipment purchase		$ 985,000
Co-venturer
Schedule of Equity Method Investments [Line Items]
Investments in joint venture				8,500,000
Co-Chief Executive Officer
Schedule of Equity Method Investments [Line Items]
Loan from related party				$ 850,000
Notes Payable \| Co-Chief Executive Officer
Schedule of Equity Method Investments [Line Items]
Stated interest rate (percent)				6.00%