PORTSMOUTH NAVAL SHIPYARD

LOCATION: Kittery, Maine

SIZE & TECHNOLOGY: One—1.5 MW/2.5 MW-HR Energy Storage System

DESIGN START: 2019

IN SERVICE: Spring 2021

FIRM ROLE: Engineer of Record


Ameresco is expanding the existing Combined Heat & Power (CHP) plant at the Ports-mouth Naval Shipyard (PNSY) in Kittery, Maine. The CHP offsets electrical purchases from the incumbent electrical utility and simultaneously produces steam to meet the facility’s requirements. Waldron’s scope includes all engineering and preparation of a detailed construction documents package to include all mechanical, electrical, civil-structural and instrumentation-controls requirements for the project. As part of the CHP expansion is the addition of one 1.5 MW/2.5 MW-hr Battery Energy Storage System (BESS). The BESS will attach to the CHP to create a hybrid-CHP microgrid.


  • One 7.6 MW gas turbine-generator

  • One natural gas compressor package

  • One heat recovery steam generator (HRSG) with fuel assisted firing (duct burner) capable of producing up to 70,000 lb/hr of steam at 200 psig and 420°F

  • A new fully upgraded PLC-based control system for all new and existing CHP plant equipment.

  • One (1) 1.5 MW/2.5 MW-hr Battery Energy Storage System


The new CHP and BESS ties into and connects to the existing steam, condensate, water, sewer, and electrical systems. It has an automated MV switchgear and microgrid control system.