The Federal Energy Regulatory Commission sent an Aug. 16 letter to Corral Creek South Hydro LLC about an overdue update for an 1,100-MW pumped storage hydro project in Idaho.
In January, FERC granted the company a successive preliminary permit for this project, when the company wasn’t able to move forward with a license application for this project at the expiration of its prior permit. The permit runs for 36 months, with six-month updates required. FERC said the company missed its first update report deadline on the new permit, with the permit to be cancelled in 30 days if the report isn’t filed.
The company is proposing the Corral Creek Pumped Storage Project No. 13314, to be located near Twin Falls in Twin Falls County, Idaho.
The proposed project would consist of: a 180-foot-high, 8,400-foot-long upper earthen dam; an upper reservoir with surface area of 118 acres, storage capacity of 9,120 acre-feet, and maximum pool elevation of 6,620 feet mean sea level (msl); a 200-foot-high, 4,140-foot-long lower earthen dam; a lower reservoir with surface area of 113 acres, storage capacity of 10,880 acre-feet, and maximum pool elevation of 5,500 feet msl; a 30-foot-diameter, 4,710-foot-long steel penstock; a powerhouse containing 4 pump/turbine units with a total installed capacity of 1,100 MW; and a 10.6-mile-long, 500-kV transmission line. The estimated annual generation of the project would be 3,212 gigawatt-hours.
The project company is represented in this permitting by Symbiotics LLC.