The U.S. Army Corps of Engineers and the U.S. Navy selected Ameresco to design and install three comprehensive energy conservation projects under an Energy Savings Performance Contract (ESPC), as well as a microgrid solution funded by a grant to demonstrate islanding capabilities which eliminates downtime during a loss of the electric public utility at Portsmouth Naval Shipyard in Kittery, Maine.
“Ameresco and their design and construction teams have done an exceptional job partnering with the Portsmouth Naval Shipyard team to provide this innovative technology upgrade to our existing microgrid.”
– Russell Gagner
Production Division Director, PWD-Maine, NAVFAC MIDLANT
Million Square Feet
Million ESPC Energy Project Size
MW Emergency Power Capacity
Energy Savings (2016)
Improvements made to the Shipyard’s various systems have allowed for the elimination of older equipment. With newly installed technologies and equipment, the Shipyard regularly saves on energy and has the ability to operate self-sufficiently if necessary.
Annual energy savings of up to 43.165 million kWh
Upgraded facility lighting
Enhanced utility system security and reliability
Enhanced reliability of electric service to the base
Ameresco’s three phase ESPC project included extensive upgrades to the shipyard’s steam, power and control systems. Ameresco also provides the shipyard with commissioning, operation and maintenance of the newly installed equipment.
10.4MW / 280,000 lb/hr Combined Heat and Power (CHP) plant
Two low-emission 5.2MW Solar Taurus 60 gas turbines
Two 70,000 lb/hr Heat Recovery Steam Generators
Two 70,000 lb/hr package Boilers
Two 2 MW emergency diesel Generators
Microgrid control system, new protective relaying with Fast Load-shed technology
500 kW/580kWh Battery Energy Storage System (BESS)