County annual report · FIPS 22103
2021 St. Tammany Parish, LA Power Outage Report
In 2021, customers in St. Tammany Parish, LA went without power for an average of 99.6 hours, a total of 16.4M customer-hours (Louisiana average 99.7 hours). That ranks 18th worst of 64 Louisiana counties and 79th of 2,974 nationally.
Compared with LA, the US and 2020
Coverage line is EAGLE-I's share of Louisiana customers tracked each year.
Biggest outages in St. Tammany Parish, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 29, 2021 10:45 | September 19, 2021 22:30 | 21d 11h | 130,114 | 15.9M |
| 2 | January 1, 2021 00:00 | February 17, 2021 17:45 | 47d 17h | 18,288 | 100K |
| 3 | April 14, 2021 09:00 | May 28, 2021 15:30 | 44d 6h | 8,191 | 78K |
| 4 | October 2, 2021 15:15 | October 3, 2021 03:15 | 12h | 5,385 | 3,079 |
| 5 | October 18, 2021 12:15 | October 21, 2021 02:00 | 2d 13h | 4,355 | 8,004 |
| 6 | March 29, 2021 13:00 | April 1, 2021 21:30 | 3d 8h | 4,179 | 5,601 |
| 7 | March 19, 2021 08:45 | March 19, 2021 11:00 | 2h 15m | 3,760 | 3,415 |
| 8 | August 1, 2021 19:15 | August 2, 2021 02:45 | 7h 30m | 3,481 | 4,391 |
| 9 | October 4, 2021 11:15 | October 5, 2021 22:45 | 1d 11h | 3,389 | 4,365 |
| 10 | April 13, 2021 12:45 | April 14, 2021 07:15 | 18h 30m | 3,199 | 9,806 |
Outage episodes by size in 2021: 121 reached 100+ customers, 28 reached 1,000+ customers, 2 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving St. Tammany Parish reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Entergy Louisiana LLC | 2021 | 111.5 hrs | 3.16 | 4.1 hrs | 1.62 |
| Washington-St Tammany E C, Inc | 2021 | 125.8 hrs | 5.79 | 10.2 hrs | 3.58 |
| Cleco Power LLC | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 90% of Louisiana's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 164,188 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. St. Tammany Parish has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), St. Tammany Parish, LA annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/louisiana/st-tammany-parish