The California Independent System Operator has asked Northern Californians to conserve power today and turn off their major appliances until 6 p.m. this evening.
"This is the first heat-related Flex Alert that we have issued this summer," said Steven Greenlee, the senior public information officer with California ISO, a quasi-governmental corporation that monitors power consumption and production across the state.
A Flex Alert is issued when CAISO determines that the demand for electricity begins to approach the supply in a certain region. It is less severe than an electrical emergency, and it does not indicate that a blackout is imminent.
Greenlee said an alert also was issued in April when a PG&E substation in the Bay Area was vandalized, interrupting power supplies. Currently, California's electricity demand is projected to peak at nearly 46,000 megawatts, below the supply of about 52,000 megawatts, according to CAISO's website.
Call The Bee's Jack Newsham, (916) 321-1100.