In about half the country, power utilities have turned over administration of their electrical transmission systems to regional transmission organizations (RTOs), or what amounts to the same thing, independent system operators (ISOs). RTOs and ISOs oversee wholesale electricity markets and do regional transmission planning, which increases system efficiency and reduces costs for ratepayers.The power utilities in the 11 western US states are not joined together in an RTO. California has its own ISO, but it only covers that one state. In the rest of the region, utilities are islands — they each maintain their own reserves and do their own transmission planning within their own territories. It leads to enormous duplicated efforts and inefficiencies.For years, there has been discussion of creating a western RTO, to bring the western states together to share resources and coordinate transmission planning. Analysts have found that an RTO could save the region’s ratepayers billions of dollars a year.Recently the discussion has begun to heat up again. A regionalization bill in California was tabled this year but promises to return next session. Governor Gavin Newsom expressed his support for the idea. Nonetheless, numerous sticky technical and political issues remain to be hashed out.To explore the promise and risks of a western RTO, I contacted Michael Wara, director of the Climate and Energy Policy Program at the Stanford Woods Institute for the Environment. We discussed the political forces pushing for and against an RTO, the way the west's electrical system has changed since the last time this discussion came up, and incremental steps that can be taken in the direction of greater regional cooperation. Get full access to Volts at www.volts.wtf/subscribe