California ISO

The California Independent System Operator has extended its Flex Alert for a second day due to high heat and increased energy demand.

The operator of California’s power grid is asking residents to conserve power for a few hours Thursday evening as record-breaking heat blankets the West this week

We often hear about “heat waves” in San Diego County but what, exactly, defines this weather pattern? NBC 7 meteorologist Dagmar Midcap explains.

When the California ISO calls for a Flex Alert it means all Californians can jump in to help prevent power interruptions. Here’s what you can do.

A relentless heat wave scorching parts of Southern California prompted the operator of the state’s electric power system to issue an emergency notice Saturday evening, which meant rotating blackouts were possible, including in San Diego County.