Seeking to more easily sell the surplus solar power to other states, expand competition for electricity in general and reduce prices for California residents who pay some of the highest electricity costs in the nation, Gov. Supporters say it will help California’s green energy revolution spread across the West and lower utility bills. “Right now, California buys power when we need extra power,” said Katelyn Roedner Sutter, state director of the Environmental Defense Fund, a nonprofit group. He cited a study done by a consultant for the California Energy Commission earlier this year showing that California ratepayers could save between $294 million and $790 million a year due to increased competition. California already has laws that limit the carbon intensity of electricity flowing into the state, essentially blocking the import of coal power, he added.