Tri-County Electric Coop, Inc (SC)
Cooperative electric utility · South Carolina · #775 of 3,199 U.S. utilities by customers · EIA utility #14175
Tri-County Electric Coop, Inc (SC) is a cooperative electric utility serving 18,488 customers in South Carolina. In 2025 it sold 307 gigawatt-hours of electricity for $57.95M in revenue, an average realized rate of 18.86¢ per kWh across all customer classes and 19.94¢ per kWh for residential customers. Its reported service territory covers 6 counties. EIA records its activities as: distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 17,670 | 240 | $47.81M | 19.94¢ | |
| Commercial | 541 | 44.1 | $7.20M | 16.32¢ | |
| Industrial | 277 | 23.3 | $2.94M | 12.61¢ | |
| Total | 18,488 | 307 | $57.95M | 18.86¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (1,131 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 18,410 | 299 | $43.40M | 15.52¢ |
| 2022 | 18,355 | 310 | $45.81M | 15.74¢ |
| 2023 | 18,377 | 289 | $47.01M | 17.27¢ |
| 2024 | 18,466 | 301 | $52.64M | 18.51¢ |
| 2025 | 18,488 | 307 | $57.95M | 19.94¢ |
Reliability (2025)
Average outage time (SAIDI): 265 minutes per customer per year
Average outages (SAIFI): 2.45 per customer
Average restoration time (CAIDI): 108 minutes
As reported for South Carolina under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: — GWh
Wholesale power purchased: 323 GWh
Winter peak demand: 97 MW
Energy losses: 4.8% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 0.0% of 18,488 meters
Customer-sited generation (net metering): 211 installations, 1.7 MW of capacity
Counties served
Calhoun, SCKershaw, SCLexington, SCOrangeburg, SCRichland, SCSumter, SC
Other large utilities in South Carolina
- Dominion Energy South Carolina, Inc - 824,270 customers, residential 16.41¢
- South Carolina Public Service Authority - 219,897 customers, residential 12.91¢
- Berkeley Electric Coop Inc - 138,073 customers, residential 16.32¢
- Horry Electric Coop Inc - 103,949 customers, residential 13.83¢
- Palmetto Electric Coop Inc - 81,863 customers, residential 14.39¢
- Blue Ridge Electric Coop Inc - (SC) - 74,014 customers, residential 19.82¢
- York Electric Coop Inc - 71,541 customers, residential 13.68¢
- Laurens Electric Coop, Inc - 66,192 customers, residential 15.62¢
All South Carolina utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #14175 in the EIA frame.