The Western Energy Imbalance Market saw financial benefits soar to a record $71.2 million in the second quarter, according to a CAISO report.

Idaho Power and Powerex began transacting in the EIM, bringing to eight the number of members participating in CAISO’s regional real-time market.

Arizona Public Service and Puget Sound Energy have met the milestones to participate in the CAISO-run Western EIM and will begin trading in the market on Oct. 1.

Idaho Power signed an agreement with CAISO to become the sixth utility to join the western Energy Imbalance Market.