top of page



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


IN SERVICE: Spring 2021

FIRM ROLE: Engineer of Record

Ameresco expanded the existing Combined Heat & Power (CHP) plant at the Portsmouth Naval Shipyard (PNSY) in Kittery, Maine. The CHP offset electrical purchases from the incumbent electrical utility and simultaneously produced steam to meet the facility’s requirements. Waldron’s scope included all engineering and the 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 was the addition of one 1.5 MW/2.5 MW-hr Battery Energy Storage System (BESS). The BESS was attached 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.

bottom of page