- Fourth of July Creek and Goodwin Creek
- 12.70 MW
- Download Permit
- Chugach Electric Association, Inc.
The proposed project would consist of two new developments using the same: (1) 70-foot long, 30-foot-wide, 30-foot-high powerhouse; (2) tailrace consisting of a concrete drop box continuing to a rip rap channel; (3) 10,900-foot-long, 69-kilovolt transmission line extending from the powerhouse to an existing substation; (4) 4,300-foot-long, 16-foot-wide gravel access road; (5) 200-foot-long bridge; and (6) appurtenant facilities.
Fourth of July Creek Development
(1) a 110-foot-long, 20-foot-wide, 18-foot-high concrete intake structure located at an elevation of 790 feet mean sea level (msl) on Fourth of July Creek; (2) a 5,200-foot-long, 54-inch-diameter steel penstock from the Fourth of July Creek intake housed in a 3,460-foot-long, 16-foot-diameter tunnel and a 1,670-foot-long, 54-inch-diameter steel penstock buried where feasible; and (3) a horizontal Francis turbine/generator unite rated for 6.6 megawatts (MW) at 637 feet of net head.
Godwin Creek Development
(1) a 110-foot-long, 20-foot-wide, 18-foot-high concrete intake structure located at an elevation of 415 feet msl on Godwin Creek; (2) a 3,500-foot-long, 78-inch-diameter steel penstock buried where feasible from Godwin Creek; and (3) a horizontal Francis turbine/generator unit rated for 6.1 MW at 280 feet of net head.
- West Creek
- 25.00 MW
- Download Permit
- Alaska Power and Telephone Company
The proposed project would consist of the following new facilities:
(1) a 1,500- foot-long, 175-foot-high concrete gravity dam creating a 895-acre reservoir having a total storage capacity of 86,000 acre-feet at a normal maximum operating elevation of 780 feet mean sea level;
(2) a water intake structure at the dam;
(3) a 15,900-foot-long, 10-footdiameter unlined tunnel;
(4) a 60-foot by 150-foot powerhouse containing two turbine/generation units rated for a total of 25 megawatts;
(5) a 100-foot-long by 80-footwide open channel tailrace returning water to the West Branch Taiya River;
(6) a submarine 3.9-mile-long, 34.5-kilovolt transmission line extending from the powerhouse to a landing for a substation on Nahku Bay connected to an existing transmission line owned by the applicant (the point of interconnection); and
(7) appurtenant facilities. The estimated annual generation of the West Creek Project would be 110 gigawatt-hours
- Crooked Creek and Jim’s Lake
- 1.60 MW
- Download Permit
- Community of Elfin Cove
The proposed project would consist of two developments, the Upper System and the Lower System.
- The Upper System would consist of: (1) a 40-foot-long, 4-foot-wide, 4-foot-tall diversion structure to divert up to 5 cubic feet per second (cfs) from Crooked Creek; (2) a 1,450-foot-long, 1-foot-diameter penstock extending from the diversion structure and the powerhouse; (3) a powerhouse containing a 35-kilowatt (kW) power recovery turbine; (4) a 25-foot-long, 8-foot-wide, 3-foot-deep cobble-lined tailrace discharging flows into Jim’s Lake; (5) an underground 7,300-foot-long, 7.2/12.47-kilovolt (kV) transmission line extending from both powerhouses to Elfin Cove’s existing 7.2/12.47-kV transmission line; and (6) appurtenant facilities.
- The Lower System would consist of: (1) a siphon intake located in Jim’s Lake to divert 7 cfs; (2) a 1,800-foot-long, 1.2-foot-diameter penstock extending from the siphon intake and the powerhouse; (3) a powerhouse containing a 125-kW Pelton or impulse turbine; (4) a 150-foot-long, 8-foot-wide, 3-foot-deep cobble-lined tailrace discharging flows into Port Althorp; and (5) appurtenant facilities.
The estimated annual generation of the project would be 672.7 gigawatt-hours