States › South Carolina › Tri-County Electric Coop, Inc (SC)
electric cooperative · EIA utility 14175
Tri-County Electric Coop, Inc (SC)
Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Annual figures: Form EIA-861 for 2024, final release. Monthly state figures run to July 2026.
Tri-County Electric Coop, Inc (SC) serves 17,672 residential customers in South Carolina as an electric cooperative, according to its 2024 Form EIA-861 filing, with a service territory that touches 6 counties.
Its average residential price that year was 18.51¢ per kilowatthour, 30% above the South Carolina average of 14.23¢ and 12% above the US average of 16.48¢. The figure is residential revenue divided by residential sales, so it folds in fixed charges, riders and every rate schedule the utility bills under.
That works out to an average residential bill of $203.33 a month on average use of 1,099 kWh a month. Across South Carolina the average bill was $149.51 on 1,050 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.
For reliability it reported a SAIDI of 1,041.7 minutes per customer with major event days included and 174.8 minutes with them excluded, calculated under IEEE 1366 standard. The median among South Carolina utilities reporting was 733.2 minutes with major event days; this utility's figure is 42% above that median.
The average price is up 20.9% on 2019, against up 9.5% for South Carolina as a whole, and up 7.2% on 2023. EIA's early release for 2025, which has not been fully edited, shows 19.94¢.
Compared with South Carolina, the US and other electric cooperatives
| Measure, 2024 | This utility | Electric cooperatives, US median | South Carolina | United States |
|---|---|---|---|---|
| Average residential price per kWh | 18.51¢ | 13.74¢ | 14.23¢ | 16.48¢ |
| Average monthly residential bill | $203.33 | $149.95 | $149.51 | $142.26 |
| Average monthly use, kWh | 1,099 | 1,126 | 1,050 | 863 |
| Residential price change, 1 year | +7.2% | — | +4.0% | +3.0% |
| Residential price change, 5 years | +20.9% | — | +9.5% | +26.7% |
| SAIDI, all events (minutes) | 1,041.7 | 263.0 | 733.2 median | 184.5 median |
| SAIDI, without major event days | 174.8 | 147.0 | 103.3 median | 99.8 median |
State and US prices, bills and use are EIA's own averages over every customer. The ownership column and the reliability columns are medians across utilities with at least 1,000 residential customers, computed on this site from the final 2024 file. Among the 18 filings by electric cooperatives in South Carolina, the median price was 14.88¢. In South Carolina this utility's price ranks 2 of 28, counting from the highest.
Average price by year
Tri-County Electric Coop, Inc (SC)South Carolina averageUS average
Year by year
| Year | ¢ per kWh | South Carolina ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2025 early release | 19.94¢ | 14.96¢ | $225.50 | 1,131 | 17,670 | 307.2 GWh |
| 2024 | 18.51¢ | 14.23¢ | $203.33 | 1,099 | 17,672 | 300.6 GWh |
| 2023 | 17.27¢ | 13.68¢ | $182.70 | 1,058 | 17,581 | 289.4 GWh |
| 2022 | 15.74¢ | 13.59¢ | $178.33 | 1,133 | 17,559 | 309.5 GWh |
| 2021 | 15.52¢ | 12.86¢ | $169.37 | 1,092 | 17,614 | 299.1 GWh |
| 2020 | 15.67¢ | 12.78¢ | $170.74 | 1,090 | 17,492 | 295.7 GWh |
| 2019 | 15.31¢ | 12.99¢ | $170.44 | 1,113 | 17,325 | 306 GWh |
| 2018 | 15.34¢ | 12.44¢ | $178.67 | 1,165 | 17,253 | 312.2 GWh |
| 2017 | 15.67¢ | 13.02¢ | $168.28 | 1,074 | 17,225 | 291.4 GWh |
| 2016 | 15.23¢ | 12.65¢ | $170.66 | 1,120 | 17,170 | 301.3 GWh |
| 2015 | 15.12¢ | 12.57¢ | $173.04 | 1,144 | 17,142 | 302.6 GWh |
| 2014 | 14.91¢ | 12.45¢ | $175.76 | 1,179 | 17,174 | 305.4 GWh |
| 2013 | 15.03¢ | 11.99¢ | $165.14 | 1,099 | 17,216 | 284 GWh |
Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12. EIA describes its early release as not fully edited; it is shown for this utility alone and enters no average, median or rank on this site.
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 17,672 | 233 GWh | 78% | $43,120,000 | 18.51¢ |
| Commercial | 521 | 40.3 GWh | 13% | $6,470,000 | 16.06¢ |
| Industrial | 273 | 27.3 GWh | 9% | $3,050,000 | 11.17¢ |
Customers, sales and revenue count every service type the utility reported (bundled, energy-only and delivery-only). The price column uses bundled service alone, because part-bill revenue would understate it. Sources of energy: 316.2 GWh in total, of which 0% was its own net generation and 316.2 GWh was bought wholesale; summer peak demand 78 MW.
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 4.09 interruptions per customer with major event days, 2.33 without; CAIDI 254.7 minutes per interruption. EIA's South Carolina total across all reporting utilities was 3,136.5 minutes with major event days and 117.8 without. Major event days are storms and similar events that a utility's chosen method sets apart; methods differ, so treat comparisons as approximate. What SAIDI and SAIFI mean.
| Year | SAIDI, all events | SAIDI, no major events | SAIFI, all events | SAIFI, no major events | Method |
|---|---|---|---|---|---|
| 2025 early release | 264.5 | 112.2 | 2.45 | 1.30 | IEEE 1366 |
| 2024 | 1,041.7 | 174.8 | 4.09 | 2.33 | IEEE 1366 |
| 2023 | 427.4 | 196.9 | 3.75 | 2.43 | IEEE 1366 |
| 2022 | 585.0 | 185.7 | 3.54 | 2.14 | IEEE 1366 |
| 2021 | 244.9 | 203.1 | 2.61 | 2.31 | IEEE 1366 |
| 2020 | 244.8 | 207.2 | 3.39 | 3.25 | IEEE 1366 |
| 2019 | 430.3 | 192.6 | 3.28 | 2.69 | IEEE 1366 |
| 2018 | 383.7 | 176.3 | 3.24 | 2.31 | IEEE 1366 |
| 2017 | 338.4 | 175.4 | 3.43 | 2.34 | IEEE 1366 |
| 2016 | 4,218.9 | 182.4 | 5.69 | 2.16 | IEEE 1366 |
| 2015 | 20.2 | 8.8 | 1.78 | 0.39 | IEEE 1366 |
| 2014 | 49.5 | — | 1.21 | — | IEEE 1366 |
| 2013 | 57.8 | 48.5 | 0.64 | 0.57 | IEEE 1366 |
Counties in its service territory
Counties the utility listed on Form EIA-861 for 2024. Listing a county does not mean the utility serves all of it.
Other utilities in South Carolina
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| Edisto Electric Coop, Inc | Cooperative | 15,421 | 16.40¢ | $199.83 | 2,354.6 | 293.2 |
| Lynches River Elec Coop, Inc | Cooperative | 21,363 | 15.71¢ | $160.57 | 518.1 | 164.6 |
| Broad River Electric Coop, Inc | Cooperative | 23,622 | 15.91¢ | $167.89 | 6,145.8 | 112.7 |
| Newberry Electric Coop, Inc | Cooperative | 12,970 | 16.32¢ | $162.84 | 7,940.3 | 241.0 |
| Black River Electric Coop, Inc | Cooperative | 30,610 | 13.47¢ | $169.44 | 228.0 | 99.0 |
| MPD Electric Cooperative | Cooperative | 31,874 | 10.94¢ | $143.63 | 212.9 | 90.2 |
| Fairfield Electric Coop, Inc | Cooperative | 32,397 | 14.35¢ | $163.72 | 988.0 | 248.0 |
| Santee Electric Coop, Inc | Cooperative | 35,235 | 14.74¢ | $184.48 | 441.9 | 147.0 |
All South Carolina utilities · Electric cooperatives nationwide
Questions and answers
How much does electricity cost from Tri-County Electric Coop, Inc (SC)?
Residential customers paid an average of 18.51¢ per kilowatthour in 2024. EIA derives this by dividing residential revenue by residential sales; it is an average across all rate schedules and charges, not a tariff rate.
How does that compare with South Carolina?
The South Carolina average residential price in 2024 was 14.23¢ and the US average 16.48¢; Tri-County Electric Coop, Inc (SC) was 30% above the state figure. Among 28 utility filings with a bundled residential price in South Carolina, it had the 2nd highest.
What is the average Tri-County Electric Coop, Inc (SC) bill?
$203.33 a month in 2024, on average residential use of 1,099 kWh a month (annual revenue and sales divided by customers and by twelve). The South Carolina average was $149.51 on 1,050 kWh.
How reliable is Tri-County Electric Coop, Inc (SC) service?
It reported 1,041.7 minutes of interruption per customer (SAIDI) including major event days and 174.8 minutes excluding them, with 4.09 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the Tri-County Electric Coop, Inc (SC) price rising?
The average residential price was up 7.2% in 2024 compared with 2023 and up 20.9% compared with 2019. EIA's early, not fully edited release for 2025 shows 19.94¢.
Which counties does Tri-County Electric Coop, Inc (SC) serve?
Its Form EIA-861 service territory lists 6 counties: Calhoun County, SC, Kershaw County, SC, Lexington County, SC, Orangeburg County, SC, Richland County, SC and Sumter County, SC. A county can appear in several utilities' territories.
Provenance
Source: U.S. Energy Information Administration. Annual figures are from Form EIA-861 (sales to ultimate customers, reliability, operational data and service territory files), final release for 2024, respondent "Tri-County Electric Coop, Inc (SC)", utility number 14175; the 2025 row is from EIA's early release. State and US averages are from the Form EIA-861M sales and revenue workbook, published through July 2026. All are US government works in the public domain. Page built 1 Oct 2026. Errors in processing are corrected at the next build; see corrections. For tariffs and rate schedules, consult the utility or the state utility commission.