PJM cut loads in IN, MI, OH and PA Tuesday as a 90-degree heat wave pushed loads to the highest ever for September, stressing the grid at a time when much generation and transmission was offline.

EIA: “In a highly populated area that requires significant backup power in reserve, it may be more cost-effective to upgrade the transmission system”

PJM may seek to lower the price cap on emergency demand response as a result of their review of the July 14-19 heat wave.

An overworked transformer and PJM operators’ efforts to limit prices were the focus last week as PJM continued to discuss the mid-July heat wave.