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

Power outage history

Custer County Oklahoma

8.7hours

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

23rd most of 75 in Oklahoma 1.3× the national median

Worst outage on record Oct 28, 2020 99% of customers out · 90% back in 17 hours
Hours without power, average customer per year 8.7h / yr State average 8.3 h · national median 6.6 h
Major outages a year 5.1 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 4.9days Oct 26, 2020, over 1% of customers out
Outage hours on storm days 70% Share falling on days with a NOAA storm report here
Worst year 2020 29 hours without power, average customer
Electricity customers 15,341 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 Custer'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

2020 was the worst well-recorded year, at 29 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Custer, hours without power per customer

CusterUS median countyOklahoma average
0 10 20 30 40 26 ’15 7.1 ’16 11 ’17 10 ’18 5.8 ’19 29 ’20 4.2 ’21 4.8 ’22 8.2 ’23 3.8 ’24 3.5 ’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
Oct 26, 2020 Ice storm 15,245 99% 4.9 d 17 h 403k
Dec 27, 2015 Ice storm 11,377 74% 3.1 d 2.0 d 338k
Mar 29, 2017 No storm report 10,211 67% 15 h 9.0 h 78k
Jul 9, 2023 Thunderstorms 5,527 36% 31 h 13 h 49k
Feb 21, 2018 No storm report 10,229 67% 4.0 h 30 min 33k
May 19, 2024 Thunderstorms 2,942 19% 25 h 23 h 27k
Jun 15, 2019 Tornadoes 4,026 26% 19 h 14 h 24k
Aug 11, 2023 Thunderstorms 3,460 23% 25 h 17 h 22k
Sep 24, 2016 No storm report 6,549 43% 11 h 9.8 h 21k
Jan 14, 2017 Ice storm 1,283 8% 39 h 8.0 h 20k
Oct 12, 2021 Tornadoes 5,684 37% 11 h 4.5 h 18k
Nov 28, 2015 Ice storm 1,768 12% 9.8 h 7.5 h 16k

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 +6h 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 Custer from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • Ice storm 43%
  • No storm on record 30%
  • Thunderstorms 19%
  • Tornadoes 4.5%
  • Windstorm 1.9%
  • Winter storm 0.6%

Who keeps the lights on

Utilities serving Custer

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
Public Service Co of Oklahoma Investor Owned 200 98 1.48 14.2 506k
Northfork Electric Coop, Inc OK 131 131 – 13.7 64k
CKenergy Electric Cooperative Cooperative 498 498 4.68 13.8 23k
Cimarron Electric Coop Cooperative 70 43 0.84 12.5 16k

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 15,341 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 →