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 Graham's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2020 was the worst well-recorded year, at 4 min for the average customer. Hatched years have a thin record and are left out of the averages.
Graham, 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.
No outage reached 1% of customers in the record.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
Who keeps the lights on
Utilities serving Graham
As each utility reports to the Energy Information Administration for its whole Arizona territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Arizona Public Service Co | Investor Owned | 73 | 73 | 0.84 | 17.0 | 1.3M |
| Graham County Electric Coop Inc | AZ | 173 | 86 | 2.76 | 13.4 | 65k |
| Sulphur Springs Valley E C Inc | Cooperative | 92 | 83 | 0.83 | 14.6 | 46k |
| City of Safford | AZ | – | – | – | – | 40k |
| Town of Thatcher | AZ | – | – | – | – | 21k |
| Duncan Valley Elec Coop, Inc | AZ | 354 | 66 | 2.42 | – | 16k |
| USBIA-San Carlos Project | Federal | – | – | – | 16.4 | 12k |
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.
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 19,659 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 →