Power Out Map
– 0% of Ellis out 0 customers out in Oklahoma

Power outage history

Ellis County Oklahoma

23hours

without power for the average customer in a typical year, 2018–2025

2nd most of 75 in Oklahoma 3.5× the national median

Worst outage on record Jul 7, 2023 100% of customers out · 90% back in 19 hours
Hours without power, average customer per year 23h / yr State average 8.3 h · national median 6.6 h
Major outages a year 10.1 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2hours Median across major outages, from the peak
Longest single outage 7.2days Jul 4, 2018, over 1% of customers out
Outage hours on storm days 50% Share falling on days with a NOAA storm report here
Worst year 2023 2.1 days without power, average customer
Electricity customers 2,488 ORNL customer model · 8 well-covered years

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 Ellis's customers who were without power at that day's worst moment.

20152016201720182019202020212022202320242025
0%100% of customers out

Year by year

Hours in the dark, per customer

2023 was the worst well-recorded year, at 2.1 days for the average customer. Hatched years have a thin record and are left out of the averages.

Ellis, hours without power per customer

EllisUS median countyOklahoma average
0 20 40 60 2.5 ’15 ’16 ’17 34 ’18 26 ’19 25 ’20 10 ’21 8.2 ’22 50 ’23 7.1 ’24 21 ’25 OK 8.3 US 6.6

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
Jul 7, 2023 No storm report 2,488 100% 31 h 19 h 49k
Oct 28, 2020 Ice storm 2,488 100% 2.5 d 18 h 48k
Jun 25, 2018 Thunderstorms 2,488 100% 19 h 6.8 h 39k
Jun 17, 2023 Thunderstorms 2,488 100% 27 h 4.8 h 35k
Nov 26, 2019 Wildfire 1,992 80% 26 h 29 h 28k
Jan 15, 2017 Ice storm 1,978 80% 48 h 12 h 26k
Sep 20, 2025 No storm report 2,488 100% 15 h 13 h 23k
Aug 13, 2023 Thunderstorms 2,375 95% 19 h 11 h 22k
May 29, 2018 No storm report 2,024 81% 12 h 48 min 12k
Jul 4, 2018 No storm report 194 8% 7.2 d 7.2 d 9.1k
Jan 14, 2017 Ice storm 1,588 64% 15 h 6.2 h 9.0k
Jun 15, 2023 Tornadoes 908 37% 13 h 9.2 h 7.9k

After the peak

How fast the lights come back

Each line is one major outage, from its peak. The amber line is the typical path.

0% 25% 50% 75% 100% peak+24h+48h+72h+96h half back by +8h 90% by +14h

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

00061218 Jan inside

What was happening

Weather behind the outages

Each outage is matched to NOAA storm reports for Ellis from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • No storm on record 50%
  • Thunderstorms 26%
  • Ice storm 11%
  • Wildfire 6.8%
  • Windstorm 2.0%
  • Tornadoes 1.9%
  • Winter storm 1.4%
  • Heat 0.6%

Who keeps the lights on

Utilities serving Ellis

As each utility reports to the Energy Information Administration for its whole Oklahoma territory, not this county alone. Outage minutes include major storm days.

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Oklahoma Gas & Electric Co Investor Owned 237 145 1.71 12.5 716k
Northwestern Electric Coop Inc Cooperative – – – 16.8 9.6k

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

Across Oklahoma

Where it is darkest

Hours / yr64+

All Oklahoma counties →

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 2,488 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 →