The Tunnel Generating Station is a two-unit hydroelectric station located on the Quinebaug River.

Completed in 1919, this run-of-river station is a non-FERC-licensed facility. It operates as part of a trio of hydroelectric dams in Eastern Connecticut that generates a total capacity of approximately 6.3 MW.

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  • Location: Preston, CT
  • River System: Quinebaug River
  • Capacity: 2.1 MW
  • Turbines: 2 generating units
  • Originally Built: 1919