CAISO has been operating since November 2014 in parts of California, Oregon, Washington, Utah, Idaho, and Wyoming. It now includes the active participation of the Warren Buffett-owned PacifiCorp utilities, and will soon include NV Energy, Puget Sound Energy (PSE), and Arizona Public Service (APS).
Because of access to a wide geographic dispersion of resources, the EIM has reduced fossil fuel use in favor of low-cost renewables to meet short-term imbalances in supply and demand. PacifiCorp and the ISO saved a combined $21.4 million over the first eight months of operation.
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