According to the subsequent Federal Energy Regulatory Commission's investigation and report, numerous energy trading companies, many based in Texas, such as Enron Corporation, illegally restricted their supply to the point where the spikes in power usage would cause blackouts. Rolling blackouts affecting 97,000 customers hit the San Francisco Bay area on June 14, 2000, and San Diego Gas & Electric Company filed a complaint alleging market manipulation by some energy producers in August 2000. On December 7, 2000, suffering from low supply and idled power plants, the California Independent System Operator (CAISO), which manages the California power grid, declared the first statewide Stage 3 power alert, meaning power reserves were below 3 percent. Rolling blackouts were avoided when the state halted two large state and federal water pumps to conserve electricity.