GREAT FALLS, Mont.–(BUSINESS WIRE)–BHE Montana today announced it has signed an implementation agreement to participate in the California Independent System Operator’s (CAISO) Extended Day-Ahead Market (EDAM), a significant step that will enhance the company’s ability to serve customers reliably and efficiently while strengthening coordination across the Western power grid. “The benefits already demonstrated through BHE Montana’s participation in the WEIM show the value regional coordination