South Carolina (SC) data center power coverage
Real, sourced large-load tariff and interconnection research on file for South Carolina — never inferred, never scraped, never implied beyond what's actually been checked.
Large-load tariffs
Santee Cooper (South Carolina, state-owned utility)
ThresholdNot independently confirmed during this research -- a specific numeric threshold was not found in the sources reviewed.
StatusSantee Cooper has already enacted its own higher rate for data centers and other large users, ahead of the broader PSC large-load docket covering Duke and Dominion (required to open by June 1, 2026 per a separate settlement). Confirm the specific rate structure directly.
SourceSC Daily Gazette (scdailygazette.com) coverage of the enacted rate.
Duke Energy Carolinas and Duke Energy Progress (South Carolina), service regulations for new loads of 50 MW or more
ThresholdMore than 50 MW of new non-residential load (service regulations); terms for the contract itself are still being set
StatusPARTLY SETTLED, MAIN TERMS PENDING. South Carolina PSC Order No. 2025-769 (Dec 31, 2025, Docket 2025-172-E, Duke Energy Carolinas rate case) approved a Large Load Stipulation and updates to Duke's service regulations for new non-residential customers above 50 MW, with enhanced performance and credit provisions (the specific figures are in the service regulations, not read). The parties agreed to ask the Commission to open a generic docket on minimum contract period and contract demand for billing, collateral, exit policy and capacity reductions, cost treatment, interconnection costs, flexible interconnection and clean-energy options; the petition was due by June 1, 2026 and Duke filed to open it (Docket 2026-138-E). Duke Energy Progress has a parallel stipulation (Docket 2025-154-E). Until that docket concludes there is no published South Carolina minimum term, minimum bill or exit fee. North Carolina terms are in a separate row.
SourceSouth Carolina PSC Order No. 2025-769 (dms.psc.sc.gov, read in part: the stipulation and findings on large loads); EEI list, Sept 2026, for the other dockets.
Dominion Energy South Carolina, large-load rules (generic PSC docket 2026-138-E)
ThresholdNot set. An advocacy filing in the generic docket refers to 25 MW or more of measured or contracted demand, but it is not adopted.
StatusPENDING. In Dominion Energy South Carolina's rate case the PSC (Order 2026-374, July 2, 2026) approved a large-load stipulation under which Dominion joins the generic large-load docket 2026-138-E, still open in mid-2026 with no final tariff. No South Carolina minimum term, minimum bill, collateral or exit fee is published yet. Parties are arguing that any tariff must include minimum bills, exit fees, collateral and contract timelines. The stipulation terms were not read.
SourceSouth Carolina PSC filings in Dockets 2026-138-E and 2025-325-E located by search (dms.psc.sc.gov); summary only, filings not read.
Interconnection & regulatory guidance
South Carolina — PSC large-load docket (mandated, in progress) + Santee Cooper's own enacted rate
Contact guidanceNo dedicated Duke/Dominion SC utility large-load tariff is on file here yet. As of this research, a settlement between Duke Energy and consumer/environmental advocates required the Public Service Commission to open a large-load docket no later than June 1, 2026 to evaluate safeguards for Duke, Dominion, and Santee Cooper customers; Santee Cooper (the state-owned utility) has already enacted its own higher rate for data centers/large users ahead of the PSC's broader docket.
ThresholdNo single statewide MW threshold confirmed for the PSC docket itself during this research -- check the docket directly for Duke/Dominion; Santee Cooper's own already-enacted rate structure applies to its own territory regardless of the PSC docket's outcome.
ProcessDuke Energy states it has roughly 8,000 MW of demand from 43 large-load customers already in 'advanced development' plus another 6,000 MW in earlier-stage pipeline -- a real signal of scale driving this docket's urgency.
SourceSierra Club settlement/press coverage (sierraclub.org) of the Duke Energy Progress rate settlement requiring the docket; SC PSC docket 2026-138-E notice (psc.sc.gov); SC Daily Gazette (scdailygazette.com) for Santee Cooper's own enacted rate. Primary PSC docket filings not independently read in full during this research.
Land-constraint screening
Every Kill Test automatically screens against 6 nationwide land-constraint layers, South Carolina included — no state-by-state gaps here.
FEMA Flood ZoneNearby WetlandsProtected / Conservation LandCritical HabitatSeismic HazardTribal Land
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