The California Independent System Operator (ISO) has issued a statewide Flex Alert for Wednesday from 4 p.m. to 9 p.m. due to predicted high energy demand and tight supplies across the West. A Flex Alert is a call for voluntary electricity conservation. With higher than normal temperatures in the forecast for parts of interior Northern California, the power grid operator is predicting an increase in electricity demand, primarily from air conditioning use, according to ISO.