The California Supreme Court today sided with environmental groups in a case seen as pivotal for the proliferation of rooftop solar power in California.

In a unanimous vote, justices told a lower court to revisit a ruling that upheld reduced payments to solar panel owners for selling excess power back to utility companies. Justices did not rule on whether the changes to the solar program were legal, requiring the court of appeals to determine this.

"They basically said the lower court kind of punted on the whole substance of the [solar payments] decision,” Bernadette Del Chiaro, vice president for California at the Environmental Working Group, said. “I do think they’re clearly stating this needs to be reviewed.”

At issue is a 2022 decision by state regulators to reduce by about 75% paym

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