South Carolina Public Service Commission

The South Carolina Public Service Commission (PSC) is a state regulatory body with authority over investor-owned utilities and certain transportation carriers operating within South Carolina. Its decisions directly affect the rates, service terms, and operational standards applicable to electric, gas, water, wastewater, and telecommunications utilities serving South Carolina residents and businesses. The Commission operates under a statutory framework established in Title 58 of the South Carolina Code of Laws, which defines its jurisdiction, procedural rules, and enforcement authority.

Definition and scope

The South Carolina Public Service Commission is a seven-member body whose commissioners are elected by the South Carolina General Assembly to four-year staggered terms, as specified under S.C. Code Ann. § 58-3-20. Each commissioner represents one of seven geographic districts corresponding to the state's congressional and judicial circuit boundaries.

The PSC holds original jurisdiction over the following categories of regulated entities operating within South Carolina:

  1. Investor-owned electric utilities (including Duke Energy Carolinas and Duke Energy Progress)
  2. Investor-owned natural gas distribution companies
  3. Investor-owned water and wastewater utilities
  4. Telecommunications carriers subject to state rate regulation
  5. Motor carriers, including certain for-hire transportation services, under PSC authority preserved after federal deregulation of intrastate commerce

Rate-setting, certificate of public convenience and necessity (CPCN) issuance, and service quality enforcement fall within this scope. The PSC does not regulate electric cooperatives, which operate under separate governance through their member-owned structures, nor does it have authority over municipal utilities such as the city of Greenwood's self-operated system. Federal energy transactions and interstate natural gas pipelines fall under the jurisdiction of the Federal Energy Regulatory Commission (FERC), not the PSC.

Scope limitations: The PSC's authority is bounded by state lines and applies only to intrastate utility service. Matters involving interstate transmission, wholesale electricity markets, and federally licensed hydroelectric projects are not covered by PSC jurisdiction. For a broader orientation to state government structure, see the South Carolina Government Authority index.

How it works

The PSC operates through a formal administrative proceeding model governed by the South Carolina Administrative Procedures Act (S.C. Code Ann. § 1-23-310 et seq.) and the Commission's own procedural rules. A standard rate case proceeds as follows:

  1. Filing: A regulated utility submits an application for a rate change, accompanied by supporting financial testimony, engineering studies, and proposed tariff schedules.
  2. Intervention: The Office of Regulatory Staff (ORS), established under S.C. Code Ann. § 58-4-10, intervenes as the statutory advocate for the public interest in every contested proceeding. Other parties — including large industrial customers, consumer groups, and local governments — may petition to intervene.
  3. Discovery and testimony: Parties exchange written testimony, conduct depositions, and submit data requests. Evidentiary hearings before the full Commission or a designated panel follow.
  4. Order: The Commission issues a written order setting rates, conditions, or denying relief. Orders are subject to rehearing before the PSC and judicial review in the South Carolina Court of Appeals.

The Office of Regulatory Staff operates independently from the Commission itself, a structural separation intended to prevent the PSC from simultaneously prosecuting and adjudicating the same proceeding. ORS employs engineers, accountants, and attorneys who audit utility financial records and file independent rate recommendations.

Common scenarios

Electric rate cases: Investor-owned electric utilities periodically petition the PSC to adjust base rates to recover capital investments in generation, transmission, and distribution infrastructure. Duke Energy Progress and Duke Energy Carolinas, which together serve the majority of South Carolina's investor-owned electric service territory, have each been parties to multi-year rate proceedings before the Commission.

Certificate of public convenience and necessity (CPCN): Before constructing a new generation facility or major transmission line, an investor-owned utility must obtain a CPCN from the PSC demonstrating that the project is necessary and economically reasonable. The Base Load Review Act (S.C. Code Ann. § 58-33-210) established a parallel pre-approval process for nuclear and large baseload projects, though the General Assembly amended this framework following cost overruns associated with the V.C. Summer nuclear project.

Water and wastewater rate applications: Smaller investor-owned water utilities serving unincorporated communities — including operations in Horry County and Beaufort County — file rate applications before the PSC when seeking to recover infrastructure rehabilitation costs.

Telecommunications: The PSC retains limited authority over intrastate telephone service rates and quality of service standards for incumbent local exchange carriers, though federal preemption has progressively narrowed this jurisdiction since the Telecommunications Act of 1996.

Decision boundaries

The PSC operates within a defined authority structure that distinguishes its role from adjacent regulatory bodies:

Regulatory Body Subject Matter
SC Public Service Commission Intrastate investor-owned utility rates and service
Federal Energy Regulatory Commission (FERC) Interstate transmission, wholesale markets, hydroelectric licensing
SC Office of Regulatory Staff Consumer advocacy within PSC proceedings (not a decision-maker)
SC Department of Health and Environmental Control Environmental permitting for utility infrastructure
SC Department of Labor, Licensing and Regulation Contractor licensing for utility construction trades

The PSC's rate orders are final agency action subject to appeal under S.C. Code Ann. § 58-3-140. Appeals proceed to the South Carolina Court of Appeals, not directly to the circuit court system. The South Carolina Department of Insurance holds separate jurisdiction over insurance product rate filings and has no overlap with PSC utility rate authority.

PSC orders carry prospective effect; the Commission does not award damages to individual customers or adjudicate private contract disputes between customers and utilities. Those matters proceed through the civil court system or, in the case of billing disputes, through ORS complaint mediation.

References