Stephentown, New York
Stephentown, New York is the site of Beacon Power’s first 20 MW plant (40 MW overall range) and provides frequency regulation service to the NYISO. The facility includes 200 flywheels and is managed by Beacon Power. Initial commercial operation began in January, 2011 and full output was reached in June, 2011. In this market, Beacon flywheels perform between 3,000 and 5,000 full depth-of-discharge cycles a year. Although only 10% of the NYISO market regulation market capacity, the plant provides over 30% of the Area Control Error correction, doing so with over 95% accuracy.
Interconnected at 115 kV to NYSEG transmission system