North Carolina power outages in EIA data: typical interruption hours, the Moore County grid attack, Winter Storm Elliott, and Hurricane Helene's mountain flooding.
Setup Type
Quick answer: In an ordinary year, without a major grid event, the average North Carolina utility customer loses power for about 2.1 to 2.6 hours total, per EIA's own state-level reliability data for 2019 through 2024, a baseline close to Texas's. The number that actually matters is which kind of bad year you are planning for, because North Carolina's two worst years in this data were not both hurricanes. 2022 spiked to 8.1 hours statewide because of a December 3 gunfire attack on two Duke Energy substations in Moore County and, three weeks later, Duke Energy Carolinas' first rolling blackouts in its history during Winter Storm Elliott's extreme cold snap, neither one a named storm. 2024 spiked to 25.3 hours, the worst year in this site's data for North Carolina, because of Hurricane Helene, whose worst North Carolina damage landed in the mountains more than 100 miles from the coast. Sizing backup power around hurricane season alone misses two-thirds of North Carolina's recent bad-year pattern.
Best for
North Carolina homeowners who want real outage-frequency data before sizing a backup power budget, not a marketing claim about hurricanes being the only risk.
Wrong fit
Buyers who already have their outage pattern figured out and just need cost or brand numbers. Start with the real cost or best-brand guides instead.
Tradeoff
North Carolina's ordinary-year reliability is close to Texas's, not the weak point. The weak point is that the state's two worst recent years came from three different causes, a criminal attack on the grid, a winter demand failure, and an inland flood hurricane, so planning for 'hurricane season' alone covers only one of the three.
North Carolina's outage story does not fit the coastal-hurricane mold its neighbors do. Texas, Florida, and Louisiana's worst years on this site's data are all storm years. North Carolina's are not: its second-worst year was a gunfire attack on the grid and a winter cold-snap blackout, three weeks apart, with no hurricane involved at all. Here is what the government's own reliability numbers show, what actually caused the worst years, and how to use that broader pattern instead of a storm-only assumption when you size backup power.
The data: an ordinary North Carolina year vs a bad year
The U.S. Energy Information Administration collects SAIDI (System Average Interruption Duration Index, the total minutes an average customer is without power) and SAIFI (System Average Interruption Frequency Index, how many separate interruptions that customer has) from every state's utilities every year, and publishes two versions of each: one including "major event days" (named storms and other extreme events) and one excluding them. The figures below are read directly from EIA's own live table, not a secondary summary, and were re-checked against the table's own column headers after an early automated pass mislabeled a column, the same kind of error a prior run on this site caught for Texas's data.
Year
Hours without power, all events
Hours without power, ordinary days only
Separate interruptions, all events
Separate interruptions, ordinary days only
2024
25.3
2.4
1.83
1.18
2023
4.4
2.6
1.53
1.28
2022
8.1
2.5
1.97
1.24
2021
3.6
2.1
1.25
1.07
2020
7.3
2.4
1.72
1.21
2019
4.8
2.5
1.45
1.11
The "ordinary days only" column barely moves, 2.1 to 2.6 hours across all six years, a tighter and lower band than Louisiana's 3.3 to 4.4 hours and close to Texas's 2.2 to 2.9 hours. North Carolina's background grid, storms and attacks aside, is reasonably reliable. The "all events" column is where the volatility shows up, and three of the six years, 2020, 2022, and 2024, run two to ten times the ordinary-year figure. 2021 and 2023 stayed close to their own ordinary-year baseline, meaning whatever happened in those years was minor enough not to register as a major event day statewide.
Suggested citation: Generator Guide, "How Often Does the Power Go Out in North Carolina?," EIA SAIDI/SAIFI analysis 2019-2024, checked October 21, 2026.
What actually caused the bad years, and why two of them were not hurricanes
Five named events and incidents explain the spikes in the table above, and the mix is the real finding: North Carolina's recent bad years were not all weather.
NHC's own statewide figure: more than 190,000 residents lost power. 19 of 21 total tornadoes touched down in eastern North Carolina
1 indirect (85-year-old man, fell from a ladder preparing his home, Columbus County)
Hurricane Isaias
Aug 4, 2020, Cat 1 (80 kt), landfall near Ocean Isle Beach
NHC's own statewide figure: more than 200,000 residents lost power (New Hanover County alone: 85,000). 13 of 39 tornadoes touched down in North Carolina, including an EF-3 in Bertie County, the first EF-3 tornado spawned by a tropical cyclone since Hurricane Rita in 2005
2 direct (both from the Bertie County EF-3 tornado)
Moore County substation attack
Dec 3, 2022
Gunfire damaged two Duke Energy substations (Carthage and West End). About 45,000 customers lost power initially, with restoration substantially complete by Dec 7-8
1 (87-year-old woman dependent on an oxygen concentrator, ruled a homicide by the NC Office of the Chief Medical Examiner on Aug 30, 2023)
Winter Storm Elliott rolling blackouts
Dec 24, 2022
Duke Energy Carolinas' first rolling blackouts in company history. Roughly 500,000 North Carolina and South Carolina customers affected when plunging temperatures, demand that outpaced projections, reduced generation, and a failed automated load-shed tool forced manual, extended outages
None reported by Duke Energy in its own release
Tropical Storm Ophelia
Sept 23, 2023, landfall near Emerald Isle
NC Dept. of Public Safety's own figure: peak of more than 50,000 North Carolina outages
None reported
Hurricane Helene
Sept 26-27, 2024, landfall in Florida, worst NC impact 100+ miles inland
Duke Energy's own figure: approximately 703,000 North Carolina customers without power as of 4 p.m. Sept 27, 2024
107, per NCDHHS (Buncombe County 42, Henderson County 12, Yancey County 11)
Read down that table and 2022 stops looking like a data anomaly and starts looking like two separate failures in the same month: a criminal attack on physical grid infrastructure, then a demand-driven rolling blackout during a cold snap, three weeks apart, with no named storm involved in either one. That is a genuinely different risk category than anything on this site's Texas, Florida, or Louisiana outage pages, where every spike traces to a hurricane or, in Texas's case, a single historic winter storm. Tropical Storm Fred also caused six deaths in western North Carolina in August 2021 from catastrophic flash flooding in Cruso and Haywood County, the deadliest single event in this table by death count, but its power-outage impact was modest enough that 2021's EIA figures barely moved above the state's ordinary-year baseline, and no North Carolina-specific outage customer count appears in NHC's own report for that storm.
Why North Carolina's grid risk does not fit the coastal-hurricane mold
North Carolina's investor-owned utilities, Duke Energy Carolinas and Duke Energy Progress, are members of the SERC Reliability Corporation within the Eastern Interconnection, the same major U.S. grid Louisiana and Florida belong to and a structurally different setup than Texas's self-contained ERCOT grid. That membership makes it easier to bring in mutual-aid repair crews from other states after a storm, the same practical advantage Florida and Louisiana have over Texas.
What North Carolina does not have is a single numbered storm-hardening rule the way Florida does with Rule 25-6.030. Instead, Duke Energy's grid-hardening and reliability investments move through North Carolina Utilities Commission dockets (filings including Docket No. E-7, Subs 1213, 1214, and 1219) as a Grid Improvement Plan, reviewed case by case rather than mandated by one statewide code provision. Those dockets confirm the proceeding exists and that Duke has sought cost recovery for grid-hardening investment, but we could not independently read the filings' own dollar figures or specific hardening requirements from a document that loaded as readable text this run, the same type of access block this site has previously hit with other government filing systems, so none are quoted here.
Neither the interconnection membership nor the docket process would have stopped a gunfire attack on two substations or prevented a demand spike from outpacing generation during an extreme cold snap. Those are a physical-security risk and a grid-capacity risk, not a storm-hardening problem, and they are exactly the kind of outage cause a hurricane-only prep checklist does not cover.
What this means for your generator choice
Match the machine to the pattern that actually applies to you, not to the last headline you remember.
If your household experiences the ordinary-year pattern (closer to the 2.1 to 2.6 hour, roughly one-to-two-interruption baseline above), a portable generator with a permitted interlock is usually the proportionate answer, and considerably cheaper to own. See interlock kit vs transfer switch for the legal, permitted way to connect one, and confirm the permit and licensing details in the North Carolina installed-cost breakdown.
If you live on the coast or in the mountains, the honest case for standby is broader than "hurricane season." Coastal counties face the same multi-day wind-and-surge outages Isaias and Dorian produced. Mountain and foothill counties face Helene's and Fred's pattern instead: a storm that weakens before it ever reaches you, then stalls and dumps rain that washes out the substations and transmission lines repair crews need days to reach. Either pattern is the case for a standby system with automatic switchover, not just a coastal one. Budget the full installed project, not the machine sticker, in the real cost of a whole-house generator or the North Carolina-specific number linked above.
If your real risk is a demand-driven winter event or a one-off grid failure, like the December 2022 rolling blackouts, the same standby or portable math applies, the cause of the outage does not change how you keep the lights on, but it does mean a prep checklist built only around hurricane season will not flag it. Size your system against your actual loads using what size generator do I need, regardless of which kind of outage you are planning for.
If your outages are short even in a bad year, a home battery can be the lower-hassle, silent option. See the honest tradeoff in generator vs home battery.
How often does the power go out in North Carolina?
In a year without a major grid event, an average North Carolina utility customer loses power for about 2.1 to 2.6 hours total, per EIA's own state reliability data for 2019 through 2024, close to Texas's ordinary-year baseline. The real variable is what kind of major event hits in a given year: 2024 reached 25.3 hours statewide because of Hurricane Helene's inland mountain flooding, and 2022 reached 8.1 hours because of a December gunfire attack on two Duke Energy substations and, separately, Duke Energy Carolinas' first-ever rolling blackouts during Winter Storm Elliott.
Was the Moore County power outage caused by a storm?
No. On December 3, 2022, someone fired gunshots at two Duke Energy substations in Moore County, Carthage and West End, cutting power to about 45,000 customers for up to five days. No named storm was involved. North Carolina's Office of the Chief Medical Examiner later ruled the death of an 87-year-old Pinehurst woman who depended on an oxygen concentrator a homicide, since her machine stopped working when the attack cut her power.
Why did Duke Energy have rolling blackouts in December 2022?
During Winter Storm Elliott on December 24, 2022, Duke Energy Carolinas implemented rolling blackouts, the first in the company's history, after rapidly plunging temperatures drove electricity demand past projections while generation capacity and purchased power both fell short. Duke Energy has also stated that a failure in its automated load-shed tool forced crews to restore circuits manually, which extended the outages beyond what the company first expected, affecting roughly 500,000 North Carolina and South Carolina customers combined.
Is North Carolina's power grid getting more reliable?
The evidence is mixed, and the causes are varied enough that "reliability" means different things depending on which risk you mean. North Carolina's ordinary-year SAIDI has held in a narrow 2.1 to 2.6 hour band across all six years measured, with no clear trend. Duke Energy's Grid Improvement Plan, reviewed through North Carolina Utilities Commission dockets, is a standing process aimed at storm-hardening and reliability investment, but whether it measurably reduces restoration time after the next hurricane, winter demand spike, or physical attack is a regulatory process still working through the system, not yet an outcome visible in the outage numbers above.
Should I buy a standby generator just because of Hurricane Helene?
Helene is a legitimate reason to take North Carolina's outage risk seriously, but it is incomplete on its own, since it was a coastal-landfall storm whose worst North Carolina damage happened in the mountains. If your household's actual pattern looks like the ordinary-year data, a handful of short outages most years, a portable generator with a permitted interlock covers that pattern for a fraction of a standby project's cost. Standby earns its price when your realistic pattern includes multi-day outages, whether the cause is a coastal hurricane, an inland flood event like Helene or Fred, or a non-weather grid failure like December 2022's.
What we could not verify
A North Carolina-only customer count for the December 24, 2022 rolling blackouts. Duke Energy's own release states roughly 500,000 customers affected across North Carolina and South Carolina combined, and does not break that figure out by state.
The dollar figures and specific hardening requirements inside Duke Energy's Grid Improvement Plan filings with the North Carolina Utilities Commission. The docket proceedings (including Docket No. E-7, Subs 1213, 1214, and 1219) are confirmed to exist, but the filing documents did not load as readable text to an automated fetch this run, the same class of access block this site has hit before with other government filing systems.
A North Carolina-specific power-outage customer count for Tropical Storm Fred (2021). NHC's own tropical cyclone report documents six deaths and extensive flood damage in Haywood County but does not state a statewide NC outage figure, and we did not find one in a utility's own release.
A named, sourceable cause for any portion of 2021's or 2023's modest all-events SAIDI elevation beyond Fred and Ophelia respectively. Both years' all-events figures stayed close to their own ordinary-year baseline, so no further investigation was treated as necessary, but no single event was confirmed to fully account for the small gap in either year.
A state agency's claim that North Carolina ranks "second-highest in the nation" for average service interruptions. The NC Department of Environmental Quality's own grid-resilience page states this, but without a footnote to the underlying ranking, methodology, or year, so it is not repeated here as a verified figure.
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