County annual report · FIPS 22103
2018 St. Tammany Parish, LA Power Outage Report
In 2018, customers in St. Tammany Parish, LA went without power for an average of 2.3 hours, a total of 385K customer-hours (Louisiana average 5.1 hours). That ranks 61st worst of 64 Louisiana counties and 1704th of 2,798 nationally.
Compared with LA, the US and 2017
Coverage line is EAGLE-I's share of Louisiana customers tracked each year.
Biggest outages in St. Tammany Parish, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 1, 2018 07:00 | November 3, 2018 01:15 | 1d 18h | 12,363 | 50K |
| 2 | December 26, 2018 08:45 | December 29, 2018 00:30 | 2d 15h | 7,597 | 45K |
| 3 | July 25, 2018 12:00 | July 26, 2018 07:00 | 19h | 7,463 | 15K |
| 4 | March 11, 2018 13:30 | March 12, 2018 16:45 | 1d 3h | 5,933 | 22K |
| 5 | January 16, 2018 14:45 | January 16, 2018 20:30 | 5h 45m | 4,964 | 1,714 |
| 6 | August 28, 2018 12:45 | August 29, 2018 01:15 | 12h 30m | 4,804 | 4,303 |
| 7 | June 5, 2018 10:30 | June 6, 2018 04:15 | 17h 45m | 4,713 | 4,209 |
| 8 | June 21, 2018 14:15 | June 21, 2018 23:45 | 9h 30m | 4,705 | 5,679 |
| 9 | November 13, 2018 11:30 | November 14, 2018 08:45 | 21h 15m | 4,704 | 5,106 |
| 10 | December 14, 2018 12:45 | December 14, 2018 20:45 | 8h | 4,657 | 1,956 |
Outage episodes by size in 2018: 170 reached 100+ customers, 38 reached 1,000+ customers, 1 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 2018, 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 | 2018 | 4.6 hrs | 1.84 | 3.5 hrs | 1.63 |
| Washington-St Tammany E C, Inc | 2018 | 6.0 hrs | 3.74 | 6.0 hrs | 3.74 |
| 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 89% of Louisiana's customers in 2018; 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, 2018, 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/2018/louisiana/st-tammany-parish