Clark CountyPower Outage History
What this grade means
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 12, 2018 | 57 hrs | 54,821 (5%) | Hurricane John |
| Mar 30, 2017 | 46 hrs | 48,852 (5%) | High Wind |
| Feb 13, 2021 | 41 hrs | 40,695 (4%) | Thunderstorm Wind |
| Apr 16, 2016 | <1 hr | 39,644 (4%) | Flash Flood |
| Jul 1, 2025 | 56 hrs | 33,635 (3%) | Heat |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Clark County, Nevada that day.
Over the 11 years from 2015 to 2025, Clark County recorded 3,429 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Clark County started August 12, 2018 (Hurricane John), lasting 57 hours and leaving up to 54,821 customers without power (5% of the county) at its peak.
July has historically been the worst month for outages in Clark County, with 464 events recorded during that month across the dataset.
Based on this history, Clark County earns a Reliability Grade of A, placing it in the 90th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Nevada
Counties with the closest reliability grade and national percentile to Clark County.
| County | Grade | National percentile |
|---|---|---|
| Storey County | A | 88th |
| Nye County | A | 88th |
| Carson City County | B | 71st |
| Churchill County | B | 71st |
| Eureka County | B | 64th |
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 Clark County?
Between 2015 and 2025, Clark County recorded 3,429 outage events, averaging 2.4 hours each.
What is Clark County's reliability grade?
Clark County has a Reliability Grade of A, in the 90th national percentile.
What was the worst power outage in Clark County?
The worst outage on record started August 12, 2018 (Hurricane John), lasting 57 hours and affecting up to 54,821 customers.