energy grid with sun setting in backgroud

Rule 21 for Solar

Understanding Rule 21 in California & Beyond Rule 21 Solar: What Is It? Rule 21 Solar is an interconnection tariff that was originally adopted in 1982 by the CPUC (California Public Utilities Commission), as a means of controlling distributed generators that are hooked up to the electric grid.  The CPUC is the regulatory body that regulates …

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