County annual report · FIPS 22103
2020 St. Tammany Parish, LA Power Outage Report
In 2020, customers in St. Tammany Parish, LA went without power for an average of 16.5 hours, a total of 2.7M customer-hours (Louisiana average 72.6 hours). That ranks 52nd worst of 64 Louisiana counties and 506th of 3,019 nationally.
Compared with LA, the US and 2019
Coverage line is EAGLE-I's share of Louisiana customers tracked each year.
Biggest outages in St. Tammany Parish, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 28, 2020 17:45 | November 2, 2020 22:30 | 5d 4h | 80,509 | 2.2M |
| 2 | April 10, 2020 03:00 | April 11, 2020 20:00 | 1d 17h | 22,482 | 103K |
| 3 | August 20, 2020 17:15 | August 24, 2020 19:30 | 4d 2h | 11,587 | 24K |
| 4 | October 9, 2020 09:30 | October 13, 2020 15:15 | 4d 5h | 9,311 | 63K |
| 5 | June 1, 2020 11:15 | June 10, 2020 02:15 | 8d 15h | 6,897 | 27K |
| 6 | January 7, 2020 18:45 | January 8, 2020 00:15 | 5h 30m | 6,652 | 4,395 |
| 7 | July 15, 2020 12:30 | July 17, 2020 00:15 | 1d 11h | 5,459 | 8,486 |
| 8 | April 12, 2020 18:30 | April 24, 2020 03:15 | 11d 8h | 4,727 | 24K |
| 9 | June 25, 2020 17:45 | June 27, 2020 03:45 | 1d 10h | 3,793 | 5,492 |
| 10 | December 15, 2020 18:30 | December 16, 2020 13:45 | 19h 15m | 3,695 | 9,434 |
Outage episodes by size in 2020: 161 reached 100+ customers, 43 reached 1,000+ customers, 3 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 2020, 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 | 2020 | 93.2 hrs | 3.32 | 3.5 hrs | 1.44 |
| Washington-St Tammany E C, Inc | 2020 | 11.7 hrs | 4.13 | 4.9 hrs | 2.90 |
| 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 2020; 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, 2020, 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/2020/louisiana/st-tammany-parish