Tuesday April 24th 2012

WALTHAM, Mass. – April 24, 2012 – EuroSite Power Inc., 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 it has signed a partnership agreement with specialist renewable energy provider
LowC Communities Limited.

Under the terms of the agreement LowC will promote the Company’s natural gas fuelled Combined Heat and
Power (CHP), Chiller, Heat Pump and On-Site Utility solutions alongside its own renewable technologies, based
on a wide array of fuels - including pure plant oils, biomass and waste products. The agreement covers both the
United Kingdom and Republic of Ireland. The Company will also promote LowC’s complimentary solutions
alongside its own products and services.

"LowC and EuroSite Power offer complimentary technologies. By working together we can deliver a complete
range of CHP technologies across the UK and Europe" said Paul Hamblyn, Managing Director of EuroSite Power.
"Although renewable solutions are right for some projects, more are better suited to natural gas and by working
together with LowC we can access more potential projects helping to boost growth of our UK business in 2012."

"LowC offers an outstanding range of innovative, low-carbon, renewable energy technologies. Our team is very
experienced at integrating renewables into a wide range of buildings and including a natural gas solution within
our portfolio is a logical choice for us" added Richard Griffin, chief executive officer of LowC Communities.
Under the company’s On-Site Utility solution a customer will pay only for the energy used and will avoid all capital,
installation and operating costs. The company will also handle all service, maintenance and repair; therefore,
neither the site owner or occupier will need to provide manpower to support the energy equipment.

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.

About EuroSite Power
EuroSite Power Inc. and EuroSite Power Limited are subsidiaries of American DG Energy Inc. (NYSE Amex:
ADGE). Both companies supply low-cost energy to their customers through distributed power generating systems.
The companies are committed to providing institutional, commercial and small industrial facilities with clean,
reliable power, cooling, heat and hot water at lower costs than charged by conventional energy suppliers –
without any capital or start-up costs to the energy user – through its On-Site Utility energy solutions. EuroSite
Power Limited is based in Ealing, West London. More information can be found at www.eurositepower.co.uk.

About LowC Communities Limited
LowC is one of the UK’s leading low-carbon energy specialists. With expertise spanning building physics, lowcarbon
design and renewable energy generation technologies, the company can guide its clients seamlessly
through design, implementation and operation of renewable energy infrastructure – from a project’s initial
conception through to long-term operation and maintenance. Current projects include a biomass CHP system that
will reduce Chatsworth House’s carbon emissions by 90 percent and a pure plant oil CHP system for the brand
new headquarters of the Co-operative Group in Manchester. More information can be found at www.lowc.co.uk.