PJM, the largest regional power grid operator in the US: Affected by the high electricity load in the Mid-Atlantic and Midwestern regions of the United States, it has begun responding to demand and participating customers in power savings.

PJM, the largest regional power grid operator in the US: Affected by the high electricity load in the Mid-Atlantic and Midwestern regions of the United States, it has begun responding to demand and participating customers in power savings.