Interconnection Guidelines

The South Carolina Public Service Commission (PSC) adopted simplified interconnection guidelines for small distributed generation (DG) in December 2006. South Carolina's interconnection guidelines apply to Duke Energy Progress, Duke Energy Carolinas, and Dominion Energy. These guidelines address interconnection of renewable- energy systems and other forms of DG in three levels -Streamlined interconnection process for a certified inverter based generating unit up to 20 kWFast Track for interconnection for systems larger than 20 kW up to 2 MWFor larger interconnection systems greater than 2 MW requiring interconnection study. The customer may submit a formal Pre-Application Report request with a $500 non-refundable fee. The utility will provide a report identifying the substation, area bus, or a circuit that would be the proposed point of interconnection. Utilities may not require residential customers to carry liability insurance beyond the amount required by a standard homeowner's policy ($100,000 minimum coverage), but non-residential generators are required to carry comprehensive general liability insurance ($300,000 minimum coverage). Generators are responsible only for upgrade and improvement costs associated directly with a system's interconnection, but these costs may be determined by utilities. Utilities are prohibited from imposing indirect fees and charges. The guidelines include a mutual-indemnification requirement. A redundant external disconnect switch is required, and the capacity of all interconnected generation is generally limited to a maximum of 2% of rated circuit capacity.