The Alberta Utilities Commission on Oct. 5 approved an application from ATCO Power to approve alterations to the Rainbow Lake cogeneration station.
The Rainbow Lake station is located about 12 kilometers southeast of the town of Rainbow Lake, Alberta. The now-approved work is in relation to facilities previously constructed and operating.
ATCO stated that the proposed alterations to the Rainbow Lake station are to allow the Husky Oil Operations Ltd. electrical load at the Husky gas processing plant to be served directly by the Rainbow Lake generating units RB4 and RB5 at a distribution level voltage, which would eliminate the need to increase the size of the existing transformers in the ATCO Electric 791S substation. The Husky load would be served by the Alberta Interconnected Electrical System (AIES) when the generators are off-line.
ATCO further stated that the RB4 and RB5 generators would maintain their existing capability and connection point to the AIES. The Alberta Electric System Operator provided a letter to ATCO authorizing the proposed work on June 1.
The approved work includes the addition of a switchgear building housing two new 13.8-kV circuit breakers and bus, and modification of some existing feeder cables. ATCO also stated that the modifications would occur either within the existing plant site boundaries on land owned by Husky or across ATCO’s land.