Customers called on to limit power consumption during weekend heatwave

California is going to face potential power shortages in a heatwave over the Labor Day weekend.

On Thursday the manager of the state power grid issued a Flex Alert calling for voluntary electricity conservation Saturday through Monday between the hours of 3 p.m. and 9 p.m.

The California Independent System Operator earlier ordered power generators to postpone outages for routine maintenance from 6 a.m. Saturday to 8 p.m. Sunday.

A mid-August heat wave strained the grid to the point where the Cal ISO ordered utilities to implement brief rolling blackouts for the first time since 2001.