American DG Energy to Hold Earnings Conference Call On Wednesday, November 11, 2009

American DG Energy to Hold Earnings Conference Call On Wednesday, November 11,
2009

WALTHAM, Mass., Nov. 4 /PRNewswire-FirstCall/ -- American DG Energy Inc.
(NYSE-Amex: ADGE), a leading OnSite Utility offering clean electricity, heat,
hot water and cooling to hospitality, healthcare, housing and athletic
facilities, announced that it will release its financial results for the third
quarter of 2009 on Wednesday, November 11, 2009, and will hold a conference
call on the same day at 10 a.m. Eastern Time.

During the call, the Company will discuss its third quarter financial
performance. To listen, call (800) 8602442 within the U.S. or (412) 858-4600
outside the U.S. Participants should reference American DG Energy to access
the call. Please begin dialing at least 10 minutes before the scheduled
starting time. The earnings press release will be available on the Company
web site at www.americandg.com in the "Investors" section under "News
Releases." The earnings call will be available for playback through
Wednesday, November 18, 2009. To listen to the playback, call (877) 3447529
within the U.S., or (412) 317-0088 outside the U.S., and use Playback Code
435474.

The conference call will be webcast live, at www.americandg.com/webcast.htm
and the webcast will be archived for 90 days.

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.

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.

SOURCE American DG Energy Inc.

John Hatsopoulos, American DG Energy, +1-781-522-6020; Investors, Peter L.
Seltzberg, Hayden IR, +1-646-415-8972