Power outage history
Clark County Nevada
1.2hours
without power for the average customer in a typical year, 2018–2025
12th most of 12 in Nevada 82% below the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Clark's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2025 was the worst well-recorded year, at 1.9 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Clark, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Aug 12, 2018 | Thunderstorms | 54,821 | 5% | 13 h | 20 h | 365k |
| Mar 30, 2017 | Windstorm | 48,852 | 5% | 11 h | 13 h | 301k |
| Mar 2, 2024 | Windstorm | 30,661 | 3% | 12 h | 11 h | 251k |
| Feb 13, 2021 | Thunderstorms | 40,695 | 4% | 8.8 h | 12 h | 221k |
| Jul 1, 2025 | Thunderstorms | 31,106 | 3% | 9.0 h | 12 h | 143k |
| Jul 19, 2018 | Thunderstorms | 23,953 | 2% | 2.5 h | 6.5 h | 52k |
| Apr 20, 2025 | No storm report | 13,915 | 1% | 3.0 h | 1.0 h | 38k |
| Feb 15, 2021 | No storm report | 14,420 | 1% | 2.5 h | 1.5 h | 33k |
| Jul 25, 2021 | Thunderstorms | 14,747 | 1% | 2.5 h | 4.5 h | 33k |
| Oct 26, 2020 | Windstorm | 11,910 | 1% | 3.0 h | 2.8 h | 33k |
| Sep 26, 2025 | Thunderstorms | 13,801 | 1% | 2.5 h | 4.0 h | 33k |
| Apr 2, 2023 | No storm report | 15,178 | 2% | 2.0 h | 1.0 h | 30k |
| Mar 5, 2017 | Windstorm | 17,073 | 2% | 2.8 h | 1.2 h | 29k |
| Feb 21, 2023 | Windstorm | 19,498 | 2% | 2.5 h | 12 min | 29k |
| Dec 4, 2022 | No storm report | 15,184 | 2% | 1.8 h | 2.0 h | 27k |
| Jul 9, 2023 | Heat | 13,241 | 1% | 2.2 h | 2.5 h | 26k |
| Nov 23, 2024 | Windstorm | 15,734 | 2% | 1.8 h | 8.5 h | 24k |
| Jul 29, 2022 | Thunderstorms | 16,373 | 2% | 1.5 h | 4.2 h | 24k |
| Apr 3, 2021 | No storm report | 15,840 | 2% | 1.5 h | 30 min | 22k |
| Aug 11, 2022 | Thunderstorms | 12,808 | 1% | 1.8 h | 2.5 h | 21k |
| Feb 9, 2021 | No storm report | 13,743 | 1% | 1.5 h | 1.2 h | 21k |
| Nov 22, 2018 | No storm report | 13,438 | 1% | 1.5 h | 3.2 h | 20k |
| Aug 10, 2025 | No storm report | 14,048 | 1% | 1.8 h | 2.8 h | 19k |
| Nov 29, 2025 | No storm report | 10,657 | 1% | 1.8 h | 48 min | 19k |
| Feb 7, 2025 | Windstorm | 14,265 | 1% | 1.2 h | 12 min | 17k |
| Jul 16, 2024 | No storm report | 13,851 | 1% | 1.2 h | 2.8 h | 17k |
| Jul 10, 2016 | No storm report | 13,553 | 1% | 1.2 h | 1.8 h | 17k |
| Aug 14, 2024 | Heat | 14,042 | 1% | 1.2 h | 30 min | 17k |
| Mar 1, 2016 | No storm report | 13,295 | 1% | 1.2 h | 1.2 h | 17k |
| Sep 26, 2020 | No storm report | 13,097 | 1% | 1.2 h | 1.2 h | 16k |
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Clark from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 52%
- Windstorm 23%
- No storm on record 21%
- Heat 2.8%
- Winter storm 0.6%
Who keeps the lights on
Utilities serving Clark
As each utility reports to the Energy Information Administration for its whole Nevada territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Nevada Power Co | Investor Owned | 71 | 54 | 0.65 | 13.1 | 933k |
| Valley Electric Assn, Inc | Cooperative | 93 | 50 | 0.84 | 15.3 | 23k |
| Overton Power District No 5 | Political Subdivision | 13 | 13 | 0.18 | 12.5 | 16k |
| City of Boulder City | Municipal | 345 | 34 | 0.95 | 10.7 | 7.2k |
| Aha Macav Power Service | AZ | – | – | – | 11.7 | 2.4k |
| WAPA-- Western Area Power Administration | Federal | – | – | – | – | – |
| Colorado River Comm of Nevada | State | – | – | – | – | – |
| Southern California Edison Co | Investor Owned | – | – | – | – | – |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
- Inyo, CA 13 h
- San Bernardino, CA 6.8 h
- Nye 1.7 h
- Clark (this county) 1.2 h
- Mohave, AZ 0.8 h
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 1,008,802 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →