WEIM BOSR Western Energy Imbalance Market Body of State Regulators

The Western Energy Imbalance Market Body of State Regulators (WEIM BOSR) was established in September 2015, as a part of the governance proposal adopted by the Board of Governors of the California Independent System Operator (CAISO) to address the regional nature of its energy imbalance market (EIM). The WEIM – BOSR is comprised of one commissioner from each of the state public utilities commissions in which a regulated load-serving utility participates or plans to participate in the CAISO EIM. The WEIM BOSR provides a forum for state commissioners to (1) select a voting member of the EIM Governing Body Nominating Committee, (2) learn about and discuss the EIM and CAISO markets, and (3) express a common position in CAISO stakeholder processes or to the EIM Governing Body on EIM issues.

The EIM allows western balancing authorities outside of the CAISO footprint to participate in CAISO’s real-time wholesale energy market, without fully integrating into the CAISO balancing authority. EIM participants buy and sell power in the wholesale energy market close to the time electricity is consumed. The BOSR in partnership with the CAISO developed introductory training for regulators, which is available on the Western Energy Imbalance Market website.