(ADGE) Announces Pricing is Insufficient for Its Public Offering of Common Stock

WALTHAM, Mass., July 18, 2014  — American DG Energy Inc. (NYSE MKT: ADGE), a leading On-Site Utility offering clean electricity, heat, hot water and cooling solutions to hospitality, healthcare, housing and athletic facilities, announced today that due to poor market conditions, it cannot accept the pricing of its common stock from the offering.

This press release is neither an offer to sell nor a solicitation of an offer to buy any of the Company’s securities. No offer, solicitation, or sale will be made in any jurisdiction in which such offer, solicitation, or sale is unlawful. The shares of Common Stock have been offered by the Company pursuant to an effective shelf registration statement on Form S-3. A prospectus supplement and the accompanying prospectus relating to the offering has been filed with the SEC and will be available at the SEC’s website located at www.sec.gov or may be obtained from Aegis Capital Corp.  Prospectus Department, 810 Seventh Avenue, 18th Floor, New York, NY 10019, telephone: 212-813-1010, e-mail: prospectus@aegiscap.com.

On-Site Utility

American DG Energy sells the energy produced from an onsite energy system to an individual property as an alternative to the outright sale of energy equipment.  On-Site Utility customers only pay for the energy produced by the system and receive a guaranteed discount rate on the price of the energy.  All system capital, installation and operating expenses are paid by American DG Energy.

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.  Learn more about how American DG Energy (NYSE MKT: ADGE) reduces energy costs at www.americandg.com or follow us on Facebook and Twitter.

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.