The City and County of San Francisco plan to offer residences 100 percent renewable power supplies in place of Pacific Gas & Electric\u2019s generation starting the middle of next year. The alternative power is expected to cost more than PG&E\u2019s electricity. How much more won\u2019t be known until the utility\u2019s general rate case seeking a $454 million increase, or 8.1 percent, is approved by the California Public Utilities Commission, said Mike Campbell, San Francisco Public Utilities Commission community choice aggregation director. Supplies offered by the city and county are to be available for up to 75,000 residences in the first phase of the community aggregation plan. Takers are expected to be pro-renewable homeowners who are less price sensitive. For the first five years, the renewable supplies are to be provided by Shell. San Francisco hopes to build renewable supplies on its property. \u201cWe have identified 20 MW of solar located on municipal sites, as well as potential for private ventures providing other resources in the city,\u201d said Campbell.