 SAN FRANCISCO--BUSINESS WIRE--With hot temperatures and high energy demand across the western region, the states power grid operator is asking residents statewide to voluntarily conserve electricity this afternoon and evening when the grid is most stressed due to higher demand and energy supplies are tighter. The Flex Alert, called by the California Independent System Operator CAISO, will be in effect today from 4 p.m. to 9 p.m. The grid operator is predicting an increase in electricity de 