The second day of a dangerous heat wave brought record-high temperatures across Southern California, and sent spot electricity prices soaring to two-year highs.

As Bloomberg reports, electricity prices in Southern California averaged $552.19 a megawatt-hour in the hour ended 3 p.m. local time, the highest since August 31, 2016, as people blasted their air conditioners to keep cool.

The National Weather Service declared an excessive heat warning for the region, and California’s grid operator asked transmission operators to restrict maintenance in anticipation of high demand…..more here