San Diego Gas & Electric (SDG&E) reached all-time back-to-back peak demand records of 4,781 MW on Sept. 15 and 4,890 MW on Sept. 16.
The region saw a five-day heat wave combined with a microburst of thunderstorms with high winds, but demand response programs helped to limit strain on the grid. On Sept. 15, a total reduction of 70 MW was achieved through demand response programs, with residential customers saving 30 MW. During the heat wave, Solar Turbines was able to reduce their energy use by approximately 6 MW.
In addition to the heat wave, the region was hit with sudden microbursts that brought high winds, downed trees and flooding that resulted in localized power outages. Electricity restorations were quick thanks advanced meteorology tools, SDG&E said in a release. SDG&E also worked with the California Independent System Operator Corp. to monitor high demand, and the Sunrise Powerlink to import 450-MW of solar and wind capacity to meet higher system demands at the time of the peak.