Public Service Company of New Mexico (PNM) is the latest electric utility seeking to join a voluntary real-time bulk trading market California’s grid operator launched in 2014 that allows participants in eight US western states to buy and sell renewable and other energy to help balance supply and demand.

PNM - the state’s largest electricity provider – estimates ratepayers would save $17m annually through its participation in CAISO’s (California Independent System Operator) Western Energy Imbalance Market (EIM) - enabling it tap lower priced and a wider choice of electricity resources to meet demand.