Tunnel Battery System

The Tunnel Battery Energy Storage System (BESS) project, being developed in collaboration with New Leaf Energy, will replace the Tunnel Jet Gas Peaker, which was decommissioned in 2023. The 16+ MW BESS project will provide near equivalent energy to the decommissioned fossil-powered Jet, but will bring new benefits to the grid by charging when surplus energy exists on the grid that would otherwise go unused, while reducing GHG emissions. The Tunnel BESS project will be co-located with FirstLight’s existing Tunnel Hydro facility, highlighting the opportunity to pair batteries with hydropower to increase renewable energy supplied to Connecticut communities.

Location: Preston, CT Storage Type: Lithium Ion Battery Storage Capacity: 17 MW / 68 MWh Development Partner: New Leaf Energy Commercial Operation Estimate: 2025