Washington-St Tammany E C electricity rates
Electric cooperative · Louisiana · SERC region · MISO
Washington-St Tammany E C is a member-owned electric cooperative, so its customers own it and elect its board, serving 51,187 homes in Louisiana. Its residential customers pay an average of 11.41¢/kWh including fixed and delivery charges, 37% 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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Washington-St Tammany E C bill estimates
| Monthly use | At average all-in rate |
|---|---|
| 500 kWh | $57.05 |
| 1,000 kWh | $114.10 |
| 1,500 kWh | $171.15 |
| 2,000 kWh | $228.20 |
Washington-St Tammany E C residential rate plans
| Plan | Effective | Customer charge | Energy charges |
|---|---|---|---|
| Farm and Housetime-of-use | 2014-06-01 | $9.00 | 8.8¢ (12am–12am) — summer weekdays |
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
Washington-St Tammany E C rate history
2015–2025: +20% change in the average residential rate (9.19¢ → 11.04¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | Washington-St Tammany E C | Louisiana avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 511 | 270 | 266 |
| Outages per customer (SAIFI) | 5.20 | 2.32 | 1.34 |
| Average restoration time (CAIDI) | 98 min | — | — |
| Outage minutes excluding major storms | 484 | 216 | 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 Washington-St Tammany E C's counties, customers averaged 5 hr 9 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Tangipahoa | 670 | 129 | 8,980 | 2025-07-30 |
| Washington | 496 | 98 | 5,522 | 2025-06-14 |
| St Tammany | 168 | 66 | 23,349 | 2025-05-25 |
Washington-St Tammany E C service area
Washington-St Tammany E C serves 3 counties in Louisiana and 40 ZIP codes.
St Tammany, Tangipahoa, Washington
Cities: Laplace, Slidell, Hammond, Mandeville, Bogalusa, Covington, Reserve, Lacombe, Ponchatoula, Eden Isle, Amite, Franklinton, Gramercy, Garyville, Pearl River, Abita Springs, Kentwood, Montz, Independence, Killian, Roseland
Programs, smart meters & solar
| Smart meters (AMI) for homes | 0% |
| Time-based rate programs | None reported |
| Net-metered solar homes | 658 |
Washington-St Tammany E C at a glance
| Ownership | Electric cooperative |
| Services | Distribution |
| Commercial rate | 11.01¢/kWh |
| Industrial rate | 14.42¢/kWh |
| Retail revenue (2025) | $113,436,800 |
| Electricity sold (2025) | 1,034,712 MWh |
| Peak demand | 243 MW summer · 374 MW winter |
| Line losses | 6.1% |
| Balancing authority | MISO |
| EIA utility ID | 21567 |
Other utilities in Louisiana
Frequently asked questions
What is Washington-St Tammany E C's electricity rate?
Washington-St Tammany E C residential customers pay an average of 11.41¢ 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 12% below the Louisiana average of 12.99¢ and 37% below the U.S. average.
What is the average Washington-St Tammany E C electric bill?
About $151 a month. The average Washington-St Tammany E C home uses 1,323 kWh a month. At 1,000 kWh the bill would be about $114.
How many customers does Washington-St Tammany E C have?
Washington-St Tammany E C serves 51,187 residential customers and 55,752 customers in total in Louisiana, across 3 counties.
How reliable is Washington-St Tammany E C?
In 2025, the average Washington-St Tammany E C customer was without power for 8 hr 31 min (SAIDI) over 5.20 interruptions (SAIFI), including major storms. Excluding major event days it was 8 hr 4 min. The Louisiana average was 4 hr 30 min and the U.S. average 4 hr 26 min.
Does Washington-St Tammany E C offer time-of-use rates?
Yes. The OpenEI rate database lists 1 time-of-use residential plan, including Farm and House. Running big appliances off-peak can cut their cost. Pick the plan in the calculator above to see by how much.
Does Washington-St Tammany E C offer net metering for solar?
Washington-St Tammany E C had 658 residential net-metered customers in 2025 with 4.5 MW of capacity. Estimate solar savings at this utility's rate.
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 Washington-St Tammany E C before making decisions.