Washington-St Tammany E C, Inc
Cooperative electric utility · Louisiana · #335 of 3,199 U.S. utilities by customers · EIA utility #21567
Washington-St Tammany E C, Inc is a cooperative electric utility serving 55,752 customers in Louisiana. In 2025 it sold 1,035 gigawatt-hours of electricity for $113.44M in revenue, an average realized rate of 10.96¢ per kWh across all customer classes and 11.04¢ per kWh for residential customers. Its reported service territory covers 3 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 | 51,187 | 813 | $89.69M | 11.04¢ | |
| Commercial | 4,564 | 219 | $23.34M | 10.65¢ | |
| Industrial | 1 | 2.9 | $401.40K | 13.95¢ | |
| Total | 55,752 | 1,035 | $113.44M | 10.96¢ |
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 (1,323 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 54,027 | 971 | $92.56M | 9.62¢ |
| 2022 | 54,475 | 1,040 | $114.05M | 11.06¢ |
| 2023 | 55,020 | 1,028 | $109.72M | 10.76¢ |
| 2024 | 55,599 | 1,008 | $118.63M | 11.85¢ |
| 2025 | 55,752 | 1,035 | $113.44M | 11.04¢ |
Reliability (2025)
Average outage time (SAIDI): 511 minutes per customer per year
Average outages (SAIFI): 5.20 per customer
Average restoration time (CAIDI): 98 minutes
As reported for Louisiana 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: 1,102 GWh
Winter peak demand: 374 MW
Energy losses: 6.1% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 0.0% of 55,752 meters
Customer-sited generation (net metering): 668 installations, 4.8 MW of capacity
Counties served
St Tammany, LATangipahoa, LAWashington, LA
Other large utilities in Louisiana
- Entergy Louisiana LLC - 1,113,665 customers, residential 11.90¢
- Southwestern Electric Power Co - 556,313 customers, residential 13.10¢
- Cleco Power LLC - 295,892 customers, residential 14.26¢
- Entergy New Orleans, LLC - 208,895 customers, residential 13.20¢
- Dixie Electric Membership Corp - (LA) - 119,759 customers, residential 13.53¢
- Southwest Louisiana E M C - 118,774 customers, residential 11.57¢
- City of Lafayette - (LA) - 73,039 customers, residential 11.51¢
- Beauregard Electric Coop, Inc - 44,928 customers, residential 13.14¢
All Louisiana utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #21567 in the EIA frame.