Rolling Blackouts Possible Thursday As CA Flex Alert Called

CALIFORNIA — The California Independent System Operator is warning residents and businesses that rolling blackouts are possible between 5 and 10 p.m. on Thursday, as the agency issued a statewide Flex Alert.

The power grid is expected to be stressed as a multi-state heatwave drags on.

“The public’s help is essential when extreme weather or other factors beyond our control put undue stress on the electric grid,” said Elliot Mainzer, president and chief executive officer of the ISO. “We have seen the huge impact that occurs when consumers pitch in and limit their energy use. Their cooperation can really make adifference.”

According to Cal ISO, the power grids in Arizona and New Mexico are stressed, in addition to California.

"Under such conditions, evening is the most difficult time of day for grid operations, especially in persistent hot weather when evening temperatures stay warm, because demand for electricity remains high as solar energy diminishes," Cal ISO said in a news release.

The state was hit with rotating power outages last August and September. But Cal ISO said they would have been worse if Californians had not reduced their demand for electricity.

The rotating outages "extend available power supplies and guard against longer and more extensive disruptions while protecting high-voltage transmission lines from damage."

Before 5 p.m. on Thursday, Cal ISO recommends:

• Pre-cool your home by lowering the thermostat
• Use major appliances, like your dishwasher, and clothes washer and dryer
• Close window coverings to keep your home or apartment cool
• Charge electronic devices
• Charge electric vehicles

During the Flex Alert, from 5 to 10 p.m.:

• Set your thermostat to 78 degrees or higher, if health permits
• Avoid the use of major appliances
• Turn off all unnecessary lights
• Use fans for cooling
• Unplug unused items

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