July 19 — The Electric Reliability Council of Texas, which operates that grid that covers most of the state, says demand peaked at 73,259 megawatts between 4 p.m. and 5 p.m. Thursday, breaking the previous hour’s record of 72,691 megawatts. The previous record of 71,438 megawatts was only one day old, having been set between 3 p.m. and 4 p.m. Wednesday.