After launching a challenge before the Federal Energy Regulatory Commission (FERC) earlier this year, the wind generators are now filing cases at the Ninth Circuit Court of Appeals.

To keep its system in balance during a spring in which river levels were the fourth highest since 1929, the BPA – which operates transmission and markets power from the federal dams on the Columbia and Snake rivers – forced wind generators to shut down, serving their loads with the surplus hydroelectric power.

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