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NV Energy seeks solar grandfathering on eve of court hearingLAS VEGAS — NV Energy is asking for permission to return thousands of existing Nevada rooftop solar customers to more favorable rates for the next 20 years, just days before a court considers whether to allow a sweeping solar ballot measure that the company opposes to move forward.The company said it filed a request with the Public Utilities Commission on Wednesday to “grandfather” customers who installed a rooftop sol