American DG Energy (ADGE) 8-K American DG Energy Reports 2009 First Quarter Financial Performance

	EXHIBIT 99.1
	press release For further information contact: John Hatsopoulos, American DG Energy Telephone: 781.522.6020

American DG Energy Reports 2009 First Quarter Financial Performance

Core On-Site Utility Energy Business Revenues Grew 13%

WALTHAM, Mass. – May 14, 2009 – American DG Energy Inc. (OTC.BB:ADGE), a leading On-Site Utility offering clean electricity, heat, hot water and cooling solutions to hospitality, healthcare, housing and athletic facilities, reported overall revenues of $1,403,529 in the first quarter of 2009, compared to revenues of $1,516,952 for the same period in 2008. The core On-Site Utility energy revenues increased by 13% to $1,394,521 in 2009, compared to revenues of $1,234,909 in 2008. GAAP diluted earnings per share (EPS) were $(0.02) in the first quarter of 2009, compared to $(0.01) for the same period in 2008, and GAAP operating income was a loss of $(437,337) in the first quarter of 2009, compared to a loss of $(241,420) for the same period in 2008.

“We are pleased to report revenue growth of 13% in the first quarter of 2009 in our core On-Site Utility energy business” said John N. Hatsopoulos, Chief Executive Officer of American DG Energy. “Our On-Site Utility energy business continued to grow even though our revenues and margins were affected by lower energy prices (electricity, natural gas and oil) in the greater New York metropolitan area. We believe this is a temporary situation.”

American DG Energy will hold its earnings conference call today, May 14, at 10:00 a.m. Eastern Time. To listen, dial (800) 860-2442 within the U.S. or (412) 858-4600 outside the U.S. Participants should reference American DG Energy to access the call. This earnings press release will be available on the Company website at www.americandg.com in the “Investors” section under “News Releases.” The earnings call will be available for playback through Thursday, May 21, 2009. To listen to the playback, call (877) 344-7529 within the U.S. or (412) 317-0088 outside the U.S. and use Playback Code 430175.

About American DG Energy

American DG Energy supplies low-cost energy to its customers through distributed power generating systems. The Company is committed to providing institutional, commercial and small industrial facilities with clean, reliable power, cooling, heat and hot water at lower costs than charged by local utilities – without any capital or start-up costs to the energy user. American DG Energy is headquartered in Waltham, Massachusetts. More information can be found at www.americandg.com.

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FORWARD-LOOKING STATEMENTS

This press release contains forward-looking statements under the Private Securities Litigation Reform Act of 1995 that involve a number of risks and uncertainties. Important factors could cause actual results to differ materially from those indicated by such forward-looking statements, as disclosed on the Company’s website and in Securities and Exchange Commission filings. This press release does not constitute an offer to buy or sell securities by the Company, its subsidiaries or any associated party and is meant purely for informational purposes. The statements in this press release are made as of the date of this press release, even if subsequently made available by the Company on its website or otherwise. The Company does not assume any obligation to update the forward-looking statements provided to reflect events that occur or circumstances that exist after the date on which they were made.

American DG Energy Reports 2009 First Quarter Financial Performance, page 2 of 3

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

for the Three Months Ended March 31, 2009 and March 31, 2008

	Three Months Ended
	March 31,			March 31,
	2009			2008
	UNAUDITED			UNAUDITED
Net Sales	$	1,403,529		$	1,516,952
Cost of sales
Fuel, maintenance and installation		1,054,533			1,077,087
Depreciation expense		197,742			115,701
		1,252,275			1,192,788
Gross profit		151,254			324,164
Operating expenses
General and administrative		349,767			348,887
Selling		120,064			114,850
Engineering		118,760			101,847
		588,591			565,584
Loss from operations		(437,337	)		(241,420	)
Other income (expense)
Interest and other income		23,778			47,906
Interest expense		(117,500	)		(120,500	)
		(93,722	)		(72,594	)
Loss from continuing operations, before tax		(531,059	)		(314,014	)
Provision for state income taxes		(2,050	)		(28,613	)
Net loss		(533,109	)		(342,627	)
Less: Income attributable to the noncontrolling interest		(42,204	)		(82,135	)
Net loss attributable to American DG Energy Inc.		(575,313	)		(424,762	)
Net loss per share - basic and diluted	$	(0.02	)	$	(0.01	)
Weighted average shares outstanding -
basic and diluted		33,535,306			32,265,813
Non-GAAP financial disclosure
Loss from operations	$	(437,337	)	$	(241,420	)
Depreciation expense		201,076			115,701
Stock based compensation		84,746			95,640
Adjusted (loss) income from operations	$	(151,515	)	$	(30,079	)

American DG Energy Reports 2009 First Quarter Financial Performance, page 3 of 3

CONDENSED CONSOLIDATED BALANCE SHEETS

as of March 31, 2009 and December 31, 2008

	March 31,			December 31,
	2009			2008
	UNAUDITED
ASSETS
Current assets:
Cash and cash equivalents	$	1,502,742		$	1,683,498
Short-term investments		271,133			761,614
Accounts receivable, net		789,143			835,922
Unbilled revenue		129,448			204,750
Due from related party, current		379,538			297,417
Prepaid and other current assets		164,362			163,121
Total current assets		3,236,366			3,946,322
Property, plant and equipment, net		7,230,214			6,983,392
Accounts receivable, long- term		-			5,647
TOTAL ASSETS		10,466,580			10,935,361
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable		275,139			270,852
Accrued expenses and other current liabilities		331,814			384,340
Due to related party		195,042			166,560
Capital lease obligations		2,431			2,431
Total current liabilities		804,426			824,183
Long-term liabilities:
Convertible debentures		5,875,000			5,875,000
Capital lease obligations, long-term		13,865			14,394
Total liabilities		6,693,291			6,713,577
Stockholders’ equity:
American DG Energy Inc. shareholders' equity:
Common stock, $0.001 par value; 50,000,000 shares
authorized; 34,034,496 issued and outstanding
at March 31, 2009 and December 31, 2008, respectively		34,034			34,034
Additional paid- in- capital		12,709,578			12,614,332
Common stock subscription		(10,540	)		(35,040	)
Accumulated deficit		(10,283,858	)		(9,708,545	)
Total American DG Energy Inc. stockholders' equity		2,449,214			2,904,781
Noncontrolling interest		1,324,075			1,317,003
Total stockholders' equity		3,773,289			4,221,784
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$	10,466,580		$	10,935,361