Power from California sun turns wholesale electricity prices negative

California’s solar installations are feeding so much power into the grid that they have driven wholesale electricity prices at times as low as zero — or even below, meaning the companies that generate power pay utilities to take it. It is an environmental success story that is beginning to pose unexpected technical and financial challenges.
The U.S. Energy Information Administration (EIA) reported last week that utility-scale solar energy supplied nearly 40 percent of California&rsqu