Edison Mission Group is a holding company which acts through numerous subsidiaries to manage the competitive power generation business and other unregulated subsidiaries of Edison International.

Headquartered in Irvine, California, EMG subsidiary Edison Mission Energy (EME) is an independent power producer engaged in the business of owning, leasing, operating and selling energy and capacity from electric power generation facilities. EME also conducts price risk management and energy trading activities through Edison Mission Marketing and Trading (EMMT), which is based in Boston.