Monday July 23rd 2012

Waltham, MA – July 23, 2012 – EuroSite Power Inc. (OTCQB:EUSP), an On-Site Utility offering clean electricity, heat, hot water and cooling solutions to hospitality, healthcare, housing and leisure centers in the United Kingdom (UK) and Europe, today announced that its common stock will begin to trade on the OTCQB market under the ticker symbol “EUSP” on Wednesday, July 25, 2012. The OTCQB is a market tier for over-the-counter-traded companies that are registered and reporting with the Securities and Exchange Commission. Investors can find real-time quotes and market information for the Company at www.otcmarkets.com.

EuroSite Power has 54,362,100 shares issued and outstanding and is currently an 82.8% subsidiary of American DG Energy Inc. (NYSE MKT: ADGE).

EuroSite Power’s business is to install, own, operate and maintain complete cogeneration systemsand other efficient energy systems at customer sites. Under its On-Site Utility energy business, the Company sells to its customers the electricity, hot water, heat and cooling energy produced from its energy systems.

On-Site Utility

EuroSite Power 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, operating expenses and support are paid by EuroSite Power.