Columbia Power System electricity rates
Municipal utility · Tennessee · SERC region
Columbia Power System is a city-owned municipal utility, governed locally rather than by the state commission, serving 32,032 homes in Tennessee. Its residential customers pay an average of 13.10¢/kWh including fixed and delivery charges, 27% less than the U.S. average.
Rate basis: EIA-861 2025 annual data, adjusted to the 12 months ending 2026-07 using the state's price trend.
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Columbia Power System bill estimates
| Monthly use | At average all-in rate | Base tariff charges* |
|---|---|---|
| 500 kWh | $65.50 | $59.10 |
| 1,000 kWh | $131.00 | $105.44 |
| 1,500 kWh | $196.50 | $151.78 |
| 2,000 kWh | $262.00 | $198.12 |
*RESIDENTIAL RATE (effective 2015-08-01, $12.76/month customer charge), energy and fixed charges from the OpenEI Utility Rate Database. Riders, fuel adjustments and taxes are often billed separately, so real bills usually land closer to the all-in column. Calculate your bill.
Columbia Power System residential rate plans
| Plan | Effective | Customer charge | Energy charges |
|---|---|---|---|
| RESIDENTIAL RATE | 2015-08-01 | $12.76 | 9.27¢ |
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
Columbia Power System rate history
2015–2025: +26% change in the average residential rate (10.14¢ → 12.73¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | Columbia Power System | Tennessee avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 143 | 260 | 266 |
| Outages per customer (SAIFI) | 1.95 | 1.88 | 1.34 |
| Average restoration time (CAIDI) | 73 min | — | — |
| Outage minutes excluding major storms | 86 | 162 | 121 |
Outages in counties served (2025)
From ORNL EAGLE-I, which tracks customers without power every 15 minutes. These counts cover every utility in each county. Weighted across Columbia Power System's counties, customers averaged 113 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Maury | 244 | 66 | 5,049 | 2025-09-06 |
| Williamson | 63 | 38 | 10,700 | 2025-09-06 |
Columbia Power System service area
Columbia Power System serves 2 counties in Tennessee and 2 ZIP codes.
Maury, Williamson
Cities: Columbia
Programs, smart meters & solar
| Smart meters (AMI) for homes | 100% |
| Customers with daily usage data online | 32,032 |
| Time-based rate programs | None reported |
| Net-metered solar homes | 0 reported |
Columbia Power System at a glance
| Ownership | Municipal utility |
| Services | Distribution |
| Commercial rate | 12.56¢/kWh |
| Industrial rate | 9.27¢/kWh |
| Retail revenue (2025) | $108,079,000 |
| Electricity sold (2025) | 912,509 MWh |
| Peak demand | 208 MW summer · 209 MW winter |
| Line losses | 3.3% |
| Balancing authority | TVA |
| EIA utility ID | 3855 |
Other utilities in Tennessee
Frequently asked questions
What is Columbia Power System's electricity rate?
Columbia Power System residential customers pay an average of 13.10¢ per kWh, all charges included (EIA-861 2025 annual data, adjusted to the 12 months ending 2026-07 using the state's price trend). That's 3% below the Tennessee average of 13.56¢ and 27% below the U.S. average.
What is the average Columbia Power System electric bill?
About $145 a month. The average Columbia Power System home uses 1,110 kWh a month. At 1,000 kWh the bill would be about $131.
How many customers does Columbia Power System have?
Columbia Power System serves 32,032 residential customers and 37,542 customers in total in Tennessee, across 2 counties.
How reliable is Columbia Power System?
In 2025, the average Columbia Power System customer was without power for 2 hr 23 min (SAIDI) over 1.95 interruptions (SAIFI), including major storms. Excluding major event days it was 86 min. The Tennessee average was 4 hr 20 min and the U.S. average 4 hr 26 min.
Sources: EIA-861 2025 and EIA-861M (through July 2026), OpenEI URDB, ORNL EAGLE-I, U.S. Census. Methodology. Spot an error? Rates change often, so confirm with Columbia Power System before making decisions.