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The California Supreme Court heard arguments today in a case that could be pivotal to the spread of rooftop solar panels in California.

Environmental and consumer advocacy groups are seeking to reverse a 2022 decision by state regulators to slash by around 75% the rates paid to compensate customers with solar installations for the excess energy they generate. The move, intended to shield non-solar customers from unfair cost burdens, sent solar hookups plummeting.

Three environmental groups bringing the case — the Center for Biological Diversity, The Protect our Communities Foundation, and the Environmental Working Group — argue that the California Public Utilities Commission didn’t properly consider benefits to customers an

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