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Microgrid Design and Implementation, Westbrook, CT

The ECG Group > Microgrid / Fuel Cell > Microgrid Design and Implementation, Westbrook, CT
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PROJECT: Microgrid Design and Implementation: Westbrook, Connecticut


  • Westbrook, Connecticut
  • Project Size: Two buildings, 160,000 square feet
  • On-Site Generating Capacity: 135 kW from natural gas engines and 300 kW from photovoltaic
  • On-Site Energy Storage: 240 kW/453 kWh Lithium Ion battery energy storage
  • Reduction in Utility Purchase: 1,250,000 kWh
  • Project Status: CT Department of Energy and Environmental Protection Proposal in review
  • Completed Date: In progress, target fall 2019
    Microgrid Development Company: USA Microgrids, Inc.


The Town of Westbrook, in response to the need for increased resilience to major storms and the need to be able to continuously operate critical infrastructure, is pursuing microgrid design and development that will interconnect two critical town facilities including both the High School and Middle School used as refuges in the event of emergencies and extended grid outages.

Energy System Features

  • Low emissions natural gas fueled microturbine engines combined integrated thermal energy recovery
    for high overall fuel utilization
  • Zero emissions photovoltaic power
  • Integrated battery energy storage used for demand management
  • Ability to operate in island mode during grid outages
  • Automatic interconnection of all facilities to share available generation capacity
  • Ability to optimize interactions with the grid including balanced energy purchase and sale to minimize
    energy cost


The microgrid is being designed to be able to operate all critical elements of both buildings for an indefinite period in the event of an extended grid outage and to operate economically during normal grid operations. The microgrid adds natural gas generating capacity with the capability to operate all critical infrastructure indefinitely in the event of an extended grid outage and adds photovoltaic energy capacity combined with energy storage. The new equipment is being integrated with existing emergency generation capacity using advanced microgrid supervisory control to provide the most effective overall system. During normal operations, these systems will be operated to economically offset purchased utility energy and maximize net metering opportunities to reduce overall utility cost. The battery energy storage system allows advanced demand management strategies to further reduce normal operating costs. The combination of these capabilities is expected to reduce net utility energy purchase by up to 90%. During a grid outage, the installed capacity will support all critical infrastructure providing up to 80% of normal operating power.