MA

Deerfield No. 5 P-2323

General information

Waterway  Deerfield River
Current status  Active 
Type of facility Conventional Hydro
Mode of hydropower generation Peaking
Type of permit FERC License

FERC information

FERC docket # P-2323
Permit issued 3/30/1997
Permit expires 3/27/2037

Ownership and operation

Owner GREAT RIVER HYDRO, LLC.
Owner type Wholesale Power Marketer
Year first online (conventional hydro) 1974
Transmission or distribution system owner Western Massachusetts Electric Company

Power and generating capacity

Number of units 1
Total capacity from hydraulic turbine-generator units within each plant 17.5 mW
Average annual net hydropower generation 52,192.9 mWH

The Deerfield Project is on the Deerfield River, running along the border of Massachusetts and Vermont. Nine hydropower dams make up this project, which received a new license in 1997.

  • Water diversions once made 12 of the 66 river miles of the Deerfield barren. After minimum flow requirements were placed in the license, water has returned to these dry reaches in seasonally variant flows.
  • Operational changes enhanced the stabilization of reservoir levels, encouraging the growth of fish and bird populations.
  • Before the new license, dam operations caused unnatural fluctuating flows in 33 miles of the river.
  • Since relicensing, recreation has swelled beyond expectation. New operations held special flow releases and kept water in the river for boating.
  • The dam owner also agreed to protect local lands from aggravations such as soil erosion or excessive nutrient depletion, and to manage their flows to protect wildlife habitat.

From our Resource Library

Case Studies, Hydro guides

Activists’ Preparation Guide

See all resources