American DG Energy Estimates Energy Agreements at $152 Million

WALTHAM, Mass., July 14 /PRNewswire-FirstCall/ -- American DG Energy Inc. (NYSE Amex: ADGE), a leading OnSite Utility, offering clean electricity, heat, hot water and cooling solutions to hospitality, healthcare, housing and athletic facilities, today announced that the total value of the Company's current On-Site Utility energy agreements is approximately $152 million, based on the current price of energy, specifically electricity and natural gas.

"Our company continues to add new energy systems," said John Hatsopoulos, Chief Executive Officer of American DG Energy.  "The power of our On-Site Utility business model is our annuity revenue stream of 15-year agreements.  The $152 million of revenue will provide us with excellent cash flow over the coming years and is a significant increase in annuity revenue compared to the approximately $80 million of annuity revenue we announced in June 2008."

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 – through its On-Site Utility energy solutions.  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.