Brief On-Site Power Supply Incident at California ISO.

No Impact to Grid Operations

FOLSOM, Calif. -- The California Independent System Operator Corporation (California ISO) in conjunction with state and federal authorities, has launched an investigation into an incident following an interruption of facility power to certain computer systems around midnight. At no time was there an impact to the grid. Contingency procedures and safeguards successfully maintained system operations. The California ISO will follow its price validation process and review market prices during the early morning hours to ensure their accuracy. All systems were restored by 6:00 a.m. The investigation continues and additional details will be provided as they become available.

The California ISO is a not-for-profit public benefit corporation charged with managing the flow of electricity along California's open-market wholesale power grid. The mission of the California ISO is to safeguard the reliable delivery of electricity, and ensure equal access to 25,000 circuit miles of "electron highway." As the impartial operator of the wholesale power grid in the state, the California ISO conducts a small portion of the bulk power markets. These markets are used to allocate space on the transmission lines, maintain operating reserves and match supply with demand in real time.