California is overhauling its booming rooftop solar industry, and advocates are mad. Regulators unanimously approved a rule that will reduce the rates that utilities pay to new rooftop solar customers who generate more electricity than they consume, writes POLITICO's E&E News reporter Jason Plautz. The change could drive up the cost of rooftop installations, undercutting demand for solar panels. California first adopted so-called net metering incentives more than 20 years ago, helping the state become a leader in rooftop solar, with approximately 1.5 million home installations. The shift could be a harbinger of similar policy decisions across the nation as regulators in many states, which often look to California for guidance, race to deploy clean energy to the grid. Revisions to rooftop solar incentives have long spurred battles between solar advocates, who want to see more panels on rooftops, and utilities, which fear that net metering will undermine their business model. But members of the California Public Utilities Commission said the updated rules are designed to adapt the solar market to the changing grid. The new rules aim to drive homeowners to install battery storage systems with their solar panels. That would shift some of the use of solar-generated power to the evening hours, when demand rises but generation stops because it's night. Utilities, which supported even steeper rate cuts, argue the new rule will also end a subsidy to those wealthy enough to own solar panels. But critics say the new rules could blunt a burgeoning clean energy technology by axing a key driver for new installations. Sean Gallagher, vice president of state and regulatory affairs for the Solar Energy Industries Association, told Jason that "the failure to adopt a more gradual transition to net billing risks putting solar out of reach for millions of residents across the state." The role of rooftop solar, which supplies about 10 percent of the state's energy, is but one policy battle the state is facing as it seeks to implement a sweeping plan to achieve a zero-carbon economy by 2045. California formally approved the target Thursday.
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