Arizona Public Service and Puget Sound Energy have moved a step closer to linking up with CAISO’s Energy Imbalance Market (EIM).

A study suggests CAISO’s expansion into a multistate RTO could save Western ratepayers billions while helping meet emission-reduction goals.

Advanced energy storage is ready to move beyond pilot projects and into day-to-day operations. But it will take rule changes and cost reductions for the technologies to reach their potential.