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South Carolina Interconnection Standards

Date Last Updated8/13/2014
Policy TypeInterconnection Standard
State/FederalSC
Policy Administrator/Contact OfficePublic Service Commission of South Carolina (PSC)
Policy Initiation Date12/19/2006
Policy SummaryThe PSC adopted a simplified interconnection standard for small distributed generation (DG) including CHP systems. The standard applies to the three investor-owned utilities in the state -- Progress Energy, Duke Energy and South Carolina Electric and Gas. The standard addresses residential and non-residential renewable-energy systems and other forms of DG including CHP.
  • Residential systems: applies to systems up to 20 kW operating in a residential facility. There is a $100 application fee and the utility may not require residential customers to carry liability insurance beyond the amount required by a standard homeowner's policy ($100,000 minimum coverage).
  • Non-residential systems: applies to systems up to 100 kW operating in a non-residential facility. There is a $250 application fee and non-residential generators are required to carry comprehensive general liability insurance ($300,000 minimum coverage).
A redundant external disconnect switch is required for all systems, and the capacity of all interconnected generation is generally limited to a maximum of 2% of rated circuit capacity. Utilities must file semi-annual reports with the PSC detailing the number of interconnection requests approved and denied, and the reasons for any denial. There are no procedures for dispute resolution. Utilities are prohibited from imposing indirect fees and charges.
CHP Eligibility RequirementsBoth fossil-fueled and renewably-fueled CHP systems are eligible for standardized interconnection.
Eligible Project Size (MW)Standardized interconnection applies to systems up to 100 kW for non-residential and 20 kW for residential.
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