Arapahoe CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Feb 15, 2019 | <1 hr | 124,233 (38%) | Unnamed event |
| Oct 30, 2017 | 2 hrs | 53,378 (16%) | Unnamed event |
| Mar 2, 2023 | <1 hr | 40,045 (12%) | Unnamed event |
| Jul 11, 2023 | <1 hr | 27,946 (9%) | Tornado |
| Sep 13, 2016 | <1 hr | 24,676 (8%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Arapahoe County, Colorado that day.
Over the 12 years from 2014 to 2025, Arapahoe County recorded 2,416 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Arapahoe County started February 15, 2019, lasting less than 1 hour and leaving up to 124,233 customers without power (38% of the county) at its peak.
July has historically been the worst month for outages in Arapahoe County, with 343 events recorded during that month across the dataset.
Based on this history, Arapahoe County earns a Reliability Grade of B, placing it in the 79th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Colorado
Counties with the closest reliability grade and national percentile to Arapahoe County.
| County | Grade | National percentile |
|---|---|---|
| Rio Grande County | B | 78th |
| Otero County | B | 78th |
| Chaffee County | B | 77th |
| Morgan County | A | 81st |
| Larimer County | A | 82nd |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in Arapahoe County?
Between 2014 and 2025, Arapahoe County recorded 2,416 outage events, averaging 2.0 hours each.
What is Arapahoe County's reliability grade?
Arapahoe County has a Reliability Grade of B, in the 79th national percentile.
What was the worst power outage in Arapahoe County?
The worst outage on record started February 15, 2019, lasting less than 1 hour and affecting up to 124,233 customers.