Power Out Map
– 0% of Mono out 0 customers out in California

Power outage history

Mono County California

52hours

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

6th most of 56 in California 8.0× the national median

Worst outage on record Aug 5, 2023 25% of customers out · 90% back in 3.0 days
Hours without power, average customer per year 52h / yr State average 6.2 h · national median 6.6 h
Major outages a year 23.4 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 3hours Median across major outages, from the peak
Longest single outage 25.8days Apr 4, 2023, over 1% of customers out
Outage hours on storm days 49% Share falling on days with a NOAA storm report here
Worst year 2023 5.5 days without power, average customer
Electricity customers 5,551 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 Mono'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 5.5 days for the average customer. Hatched years have a thin record and are left out of the averages.

Mono, hours without power per customer

MonoUS median countyCalifornia average
0 50 100 150 15 ’15 15 ’16 17 ’17 19 ’18 47 ’19 32 ’20 34 ’21 28 ’22 133 ’23 34 ’24 94 ’25 US 6.6 CA 6.2

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 26, 2023 Windstorm 1,399 25% 13.5 d 3.0 d 242k
Feb 28, 2023 Winter storm 2,399 43% 6.7 d 6.7 d 130k
Mar 10, 2023 Winter storm 1,072 19% 13.3 d 30 h 108k
Nov 17, 2020 Wildfire 2,313 42% 5.2 d 2.2 d 74k
Aug 29, 2025 No storm report 5,551 100% 23 h 8.2 h 65k
Oct 5, 2019 No storm report 5,551 100% 14 h 13 h 62k
Apr 4, 2023 Windstorm 874 16% 25.8 d 27 h 54k
Feb 6, 2015 Wildfire 1,641 30% 4.3 d 2.7 d 48k
Dec 30, 2022 Winter storm 1,576 28% 3.6 d 32 h 38k
Aug 22, 2025 No storm report 3,958 71% 16 h 13 h 35k
Nov 5, 2025 Windstorm 1,801 32% 24 h 21 h 32k
Nov 13, 2019 No storm report 3,135 56% 11 h 10 h 32k

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 +32h

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 Mono from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • No storm on record 51%
  • Windstorm 22%
  • Winter storm 21%
  • Wildfire 3.7%
  • Thunderstorms 1.2%
  • Flooding 0.9%

Who keeps the lights on

Utilities serving Mono

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

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Southern California Edison Co Investor Owned 545 116 1.39 31.5 4.6M
Liberty Utilities Investor Owned 614 435 3.09 27.6 45k
Valley Electric Assn, Inc Cooperative – – – 18.7 12

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 California

Where it is darkest

Hours / yr64+

All California 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 5,551 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 →