How reliable is the power in South Carolina?
South Carolina ranks 23rd of 45 states without major events and 45th with them (1st = fewest minutes), 17 below the U.S. 129 and 2389 above the U.S. 662. Major events added 2939 minutes, 96% of the with-events total. The figure covers 2,585,427 customers, 89% of the 2,914,180 EIA lists for South Carolina.
South Carolina with and without major events
minutes without power per customer, 2024, South Carolina and U.S.
- 112South Carolina, no major events
- 129U.S., no major events
- 3,051South Carolina, with major events
- 662U.S., with major events
| Measure | South Carolina without | South Carolina with | U.S. without | U.S. with |
|---|---|---|---|---|
| SAIDI, minutes per customer | 112 | 3,051 | 129 | 662 |
| SAIFI, interruptions per customer | 1.20 | 2.37 | 1.06 | 1.53 |
| CAIDI, minutes per interruption | 94 | 1,288 | 122 | 433 |
| Median utility, SAIDI minutes | 95 | 618 | — | — |
Which South Carolina utilities move the number
Duke Energy Carolinas, LLC serves 26% of the customers in the South Carolina figure: 66% of lost customer-minutes with major events, 42% without. Without Duke Energy Carolinas, LLC, the weighted figure would be 1387 minutes with major events and 89 without, against 3,051 and 112.
- Duke Energy Carolinas, LLC: 670,391 customers (26%), 180 min without and 7,804 with; 66% of lost minutes with major events, 42% without.
- Dominion Energy South Carolina, Inc: 816,766 customers (32%), 81 min without and 1,908 with; 20% of lost minutes with major events, 23% without.
- Laurens Electric Coop, Inc: 63,495 customers (2%), 97 min without and 8,310 with; 7% of lost minutes with major events, 2% without.
All South Carolina utilities in the 2024 file
44 utilities in the 2024 EIA-861 files for South Carolina: 22 follow IEEE 1366, 5 use another method, 17 filed no reliability figures. 27 are listed.
| Palmetto Electric Coop Inc | Cooperative | IEEE 1366 | 79,619 | 32 | 631 | 0.69 | 2.44 | 95 | 1 of 18 | — |
|---|---|---|---|---|---|---|---|---|---|---|
| Greenwood CPW | Municipal | IEEE 1366 | 11,940 | 34 | 66 | 0.47 | 0.61 | 49 | 2 of 18 | — |
| South Carolina Public Service Authority | State | IEEE 1366 | 211,845 | 55 | 58 | 0.65 | 0.69 | 6 | 3 of 18 | — |
| Dominion Energy South Carolina, Inc | Investor Owned | IEEE 1366 | 816,766 | 81 | 1,908 | 1.19 | 2.52 | 96 | 4 of 18 | — |
| Berkeley Electric Coop Inc | Cooperative | IEEE 1366 | 130,042 | 89 | 293 | 0.94 | 1.59 | 70 | 5 of 18 | — |
| York Electric Coop Inc | Cooperative | IEEE 1366 | 71,302 | 89 | 981 | 1.69 | 2.20 | 91 | 6 of 18 | — |
| City of Rock Hill - (SC) | Municipal | IEEE 1366 | 40,379 | 90 | 605 | 1.26 | 2.12 | 85 | 7 of 18 | — |
| MPD Electric Cooperative | Cooperative | IEEE 1366 | 38,491 | 90 | 213 | 1.00 | 1.63 | 58 | 8 of 18 | — |
| Easley Combined Utility System | Municipal | IEEE 1366 | 17,416 | 94 | 725 | 1.00 | 1.51 | 87 | 9 of 18 | — |
| Laurens Electric Coop, Inc | Cooperative | IEEE 1366 | 63,495 | 97 | 8,310 | 1.14 | 2.84 | 99 | 10 of 18 | — |
| Black River Electric Coop, Inc - (SC) | Cooperative | IEEE 1366 | 34,494 | 99 | 228 | 1.35 | 2.00 | 57 | 11 of 18 | — |
| Horry Electric Coop Inc | Cooperative | IEEE 1366 | 95,676 | 108 | 133 | 1.56 | 1.85 | 19 | 12 of 18 | — |
| Mid-Carolina Electric Coop Inc | Cooperative | IEEE 1366 | 60,406 | 117 | 3,915 | 1.62 | 3.22 | 97 | 13 of 18 | — |
| Duke Energy Progress - (NC) | Investor Owned | IEEE 1366 | 177,876 | 126 | 263 | 1.25 | 1.71 | 52 | 14 of 18 | — |
| Lynches River Elec Coop, Inc | Cooperative | IEEE 1366 | 22,362 | 165 | 518 | 1.90 | 3.20 | 68 | 15 of 18 | — |
| Tri-County Electric Coop, Inc (SC) | Cooperative | IEEE 1366 | 18,466 | 175 | 1,042 | 2.33 | 4.09 | 83 | 16 of 18 | — |
| Duke Energy Carolinas, LLC | Investor Owned | IEEE 1366 | 670,391 | 180 | 7,804 | 1.27 | 3.04 | 98 | 17 of 18 | — |
| City of Orangeburg - (SC) | Municipal | IEEE 1366 | 24,461 | 252 | 733 | 2.13 | 2.84 | 66 | 18 of 18 | — |
| Blue Ridge Electric Coop Inc - (SC) | Cooperative | IEEE 1366 | 72,913 | 193 | 5,291 | — | — | — | Not ranked | — |
| Aiken Electric Coop Inc | Cooperative | IEEE 1366 | 52,839 | 94 | 7,941 | — | — | — | Not ranked | — |
| Santee Electric Coop, Inc | Cooperative | IEEE 1366 | 44,910 | 147 | 442 | — | — | — | Not ranked | — |
| Greer Commission of Public Wks | Municipal | Other method | 35,307 | — | 53 | — | 0.48 | — | Not ranked | other method, not comparable |
| Fairfield Electric Coop, Inc | Cooperative | Other method | 33,472 | 248 | 988 | 1.40 | 2.80 | — | Not ranked | other method, not comparable |
| Broad River Electric Coop, Inc | Cooperative | Other method | 24,976 | 113 | 6,146 | — | — | — | Not ranked | other method, not comparable |
| Edisto Electric Coop, Inc | Cooperative | IEEE 1366 | 21,317 | 293 | 2,355 | — | — | — | Not ranked | — |
| Newberry Electric Coop, Inc | Cooperative | Other method | 14,086 | 241 | 7,940 | 2.63 | 5.24 | — | Not ranked | other method, not comparable |
| City of Gaffney - (SC) | Municipal | Other method | 7,592 | 41 | 1,375 | 0.73 | 2.82 | — | Not ranked | other method, not comparable; under 10,000 customers |
South Carolina utilities with no reliability figures
17 in the sales file, no SAIDI or SAIFI row.
| Utility | Type | Customers |
|---|---|---|
| Sunrun Inc. | Behind the Meter | 7,366 |
| Lockhart Power Co | Investor Owned | 6,343 |
| Haywood Electric Member Corp | Cooperative | 14 |
| Bamberg Board of Public Works | Municipal | — |
| Coastal Electric Coop, Inc - (SC) | Cooperative | — |
| City of Newberry - (SC) | Municipal | — |
| City of Laurens - (SC) | Municipal | — |
| Little River Electric Coop Inc | Cooperative | — |
| City of Abbeville - (SC) | Municipal | — |
| Town of Prosperity - (SC) | Municipal | — |
| Clinton Combined Utility Sys | Municipal | — |
| City of Seneca - (SC) | Municipal | — |
| City of Union - (SC) | Municipal | — |
| City of Georgetown - (SC) | Municipal | — |
| City of Due West - (SC) | Municipal | — |
| City of Westminster - (SC) | Municipal | — |
| City of Camden | Municipal | — |
The biggest South Carolina utilities against the U.S.
- Dominion Energy South Carolina, Inc (investor owned, 28% of South Carolina customers in the file): SAIDI without major events 81 min, 49 below the U.S. 129; with major events 1908 min against 662.
- Duke Energy Carolinas, LLC (investor owned, 23% of South Carolina customers in the file): SAIDI without major events 180 min, 50 above the U.S. 129; with major events 7804 min against 662.
- South Carolina Public Service Authority (state, 7% of South Carolina customers in the file): SAIDI without major events 55 min, 74 below the U.S. 129; with major events 58 min against 662.
- Duke Energy Progress - (NC) (investor owned, 6% of South Carolina customers in the file): SAIDI without major events 126 min, 4 below the U.S. 129; with major events 263 min against 662.
- Berkeley Electric Coop Inc (cooperative, 5% of South Carolina customers in the file): SAIDI without major events 89 min, 40 below the U.S. 129; with major events 293 min against 662.
South Carolina by type of utility
Among South Carolina utilities that report under IEEE 1366, state utilities average 55 minutes without major events and municipal utilities 125.
| Type | Utilities | Customers | SAIDI without | Median utility | SAIDI with |
|---|---|---|---|---|---|
| Investor Owned | 3 | 1,665,033 | 125 | 126 | 4,106 |
| Cooperative | 10 | 614,353 | 94 | 98 | 1,599 |
| State | 1 | 211,845 | 55 | 55 | 58 |
| Municipal | 4 | 94,196 | 125 | 92 | 592 |
Next to South Carolina in the ranking
South Carolina report card
Smart meters: 99% of residential meters, 22 utilities (U.S. 92%). South Carolina time-based rates: 9 of 26 utilities, 0.3% of residential customers enrolled (U.S. 10.6%). South Carolina efficiency spend: $23.8 per customer (U.S. $124.2). Demand response: 30 W per customer (U.S. 77). South Carolina net-metered systems: 14.1 per 1,000 customers. Rankings.
Is your South Carolina utility better or worse than the South Carolina median?
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- South Carolina against all states
- South Carolina utilities among the best and worst
- South Carolina utility reliability and price by company
- South Carolina major outage reports from the Department of Energy
- South Carolina electricity prices
- South Carolina help with your bill
27 South Carolina filings in EIA-861 2024 (retrieved 2026-10-01), 18 ranked utilities. Method and sources.
Questions
How many minutes without power did the average South Carolina customer have in 2024?
112 minutes without major events and 3051 with them (22 IEEE 1366 utilities, customer-weighted).
Why do the two South Carolina numbers differ so much?
Major events add 2939 of the 3051 minutes (96%); Duke Energy Carolinas, LLC supplies 66% of the with-events total.
Which South Carolina utility reported the fewest and the most minutes?
Among 18 utilities with 10,000+ customers: Palmetto Electric Coop Inc 32 minutes without major events, and City of Orangeburg - (SC) 252.
Which South Carolina utilities use which method?
22 follow IEEE 1366, 5 use another method, 17 filed no reliability figures.