Columbia Power System - (TN)
Municipal electric utility · Tennessee · #444 of 3,199 U.S. utilities by customers · EIA utility #3855
Columbia Power System - (TN) is a municipal electric utility serving 37,542 customers in Tennessee. In 2025 it sold 913 gigawatt-hours of electricity for $108.08M in revenue, an average realized rate of 11.84¢ per kWh across all customer classes and 12.73¢ per kWh for residential customers. Its reported service territory covers 2 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 | 32,032 | 427 | $54.31M | 12.73¢ | |
| Commercial | 5,508 | 313 | $38.14M | 12.20¢ | |
| Industrial | 2 | 173 | $15.62M | 9.01¢ | |
| Total | 37,542 | 913 | $108.08M | 11.84¢ |
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 (1,110 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 32,897 | 672 | $72.60M | 10.99¢ |
| 2022 | 34,019 | 704 | $83.84M | 12.12¢ |
| 2023 | 35,567 | 717 | $82.78M | 11.91¢ |
| 2024 | 36,577 | 898 | $95.70M | 12.00¢ |
| 2025 | 37,542 | 913 | $108.08M | 12.73¢ |
Reliability (2025)
Average outage time (SAIDI): 143 minutes per customer per year
Average outages (SAIFI): 1.95 per customer
Average restoration time (CAIDI): 73 minutes
As reported for Tennessee 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: 0.0 GWh
Wholesale power purchased: 943 GWh
Winter peak demand: 209 MW
Energy losses: 3.3% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 100.0% of 37,542 meters
Counties served
Maury, TNWilliamson, TN
Other large utilities in Tennessee
- Nashville Electric Service - 470,927 customers, residential 14.04¢
- City of Memphis - (TN) - 429,095 customers, residential 13.24¢
- Middle Tennessee E M C - 348,660 customers, residential 12.47¢
- Knoxville Utilities Board - 222,350 customers, residential 13.83¢
- City of Chattanooga - (TN) - 202,061 customers, residential 12.92¢
- Volunteer Electric Coop - 129,770 customers, residential 13.08¢
- Cumberland Elec Member Corp - 113,734 customers, residential 13.76¢
- City of Clarksville - (TN) - 86,998 customers, residential 13.67¢
All Tennessee utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #3855 in the EIA frame.