With temperatures forecasted to reach the century mark Wednesday and Thursday in much of California, the agency managing the state's electricity supply is urging residents to conserve energy and reduce demand, if possible. The California Independent System Operator (Cal ISO- say eye-so) expects to see the highest electricity usage of the summer this week. It has declared Wednesday and Thursday as Flex Alert Days, asking consumers to curb electricity demand between the peak hours of 4 p.m. and 6 p.m. Cal ISO said it does not expect to reach Stage 1 Emergency conditions in which consumers are urged to reduce their use of electricity voluntarily to avoid severe conditions. California's peak demand record for electricity was 50,270 megawatts, set July 24, 2006. One megawatt supplies electricity to approximately 750 homes.