Coastal flooding and inland ice storms create different multi-day outage patterns across the same state.
North Carolina combines coastal hurricane flooding in the east with inland ice-storm risk farther west, so no single backup sizing scenario fits the whole state.
Mixed Hurricane and Ice-Storm Profile
North Carolina's outage pattern is defined less by wind speed than by water. Duke Energy, the dominant utility in the state, experienced nearly 1.8 million total customer outages across the Carolinas during Hurricane Florence in September 2018. But the storm's most damaging characteristic was not its peak winds. Florence stalled over the coastal plain, dumping record rainfall that flooded entire counties for days after the storm had weakened.
In 12 of the hardest-hit North Carolina counties, more than 75% of Duke Energy customers lost power. Crews could not physically reach communities like Wilmington and New Bern because major highways, including Interstate 95, were impassable under floodwater. Duke Energy estimated that restoration required replacing 500 miles of power lines, 2,600 transformers, and 4,400 power poles. Full restoration took 12 days.
For backup sizing, the flooding pattern changes the equation. Outages in flood-prone eastern North Carolina are not just about the grid going down. Road closures delay utility crews, supply trucks, and fuel deliveries alike. Portable stations here need to carry enough stored energy to bridge a gap that extends well past the storm itself.
Federal disaster declaration for hurricane causing historic flooding across eastern North Carolina.
Source: FEMA DR-4393Federal disaster declaration for hurricane causing widespread flooding and wind damage.
Source: FEMA DR-4285Evidence trail
These notes trace the editorial claims above back to FEMA, DOE, utility, or other cited records.
FEMA declaration count (19) from OpenFEMA API, deduplicated by disaster number, DR/EM/FM types, 2014-2023.
NRI composite score (83.6) from FEMA NRI county layer, population-weighted to state level.
Hurricane Florence DR-4393 and Hurricane Matthew DR-4285 from FEMA disaster declaration records.
Florence outages (1.8M customers): Duke Energy Newsroom (2018-09).
County-level outage severity (75%+ in 12 counties): Duke Energy Newsroom, Sept 16 2018 update.
Infrastructure replacement (500 mi lines, 2,600 transformers, 4,400 poles, 12-day restoration): Duke Energy Newsroom, Sept 19 2018 update.
Structured FEMA NRI, HHS emPOWER, NOAA Storm Events, and EIA methodology is documented separately on the methodology page.
NRI top hazard is Ice Storm, but Hurricane leads FEMA declarations with 11 of 19 total — a dual-season risk pattern.
NOAA storm-event records filtered to outage-relevant event types for North Carolina. Counts reflect historical storm-event assignments, not confirmed utility outages.
Analysis window
2005-01 to 2024-12
Included storm-event records
21,557
Source as of
2026-03
Included exact NOAA event types for North Carolina: Hurricane (Typhoon), Tropical Storm, Tropical Depression, Thunderstorm Wind, Tornado, High Wind, Strong Wind, Flash Flood, Flood, Storm Surge/Tide, Winter Storm, Ice Storm, Freezing Rain, Heavy Snow, Blizzard.
In this filtered NOAA record set for North Carolina, Jul has the highest monthly count (4,031 records) , and Thunderstorm Wind is the leading event type. This chart shows frequency in NOAA records, not how severe a specific outage may be.
24 events were not mapped to a county ranking.
79 events were not mapped to a county ranking.
11 events were not mapped to a county ranking.
27 events were not mapped to a county ranking.
95.0% of listed records were matched directly to this county.
87.0% of listed records were matched directly to this county.
89.8% of listed records were matched directly to this county.
89.6% of listed records were matched directly to this county.
86.4% of listed records were matched directly to this county.
90.5% of listed records were matched directly to this county.
With the current North Carolina NWS county crosswalk, most mapped forecast zones behave close to a 1:1 county match; unresolved legacy, coastal, and mountain forecast zones fall into the excluded bucket.
Direct county match
80.1%
Mapped from forecast zone
18.7%
Not assigned to county ranking
1.2%
Unresolved forecast zones
13
County-level HHS emPOWER counts for electricity-dependent Medicare beneficiaries in North Carolina.
97,390 Medicare beneficiaries in North Carolina have claims associated with electricity-dependent medical equipment. (HHS emPOWER, 2026-03)
County-level HHS emPOWER records for this state. Medicare enrollment data only. 100 counties are included in this state snapshot.
Counties with higher concentrations may face elevated community-level demand for backup power during outages. This does not indicate individual medical necessity.
Limitations: Reflects Medicare beneficiaries with claims associated with electricity-dependent medical equipment. Does not capture non-Medicare or uninsured populations. HHS masks cells from 1 to 10 as 11.
The GeneratorChecker Backup Priority Index is a county shortlist for backup planning, combining historically frequent outage-relevant storm activity with larger county counts of electricity-dependent Medicare beneficiaries. It is planning context, not a forecast or an outage guarantee.
BPI version
v1.0
Analysis window
2005-01 to 2024-12
Matched counties
100
Counties qualify for the public BPI only when both signals land at or above the 80th percentile within the state. The shortlist excludes low-base medical counties and counties with less than 30% direct NOAA county matching.
Qualifying counties shown on the page: 5.
Percentiles are computed within North Carolina only and are not comparable across states.
1. WAKE
County FIPS 37183
At-risk Medicare count
5,847
Storm-event records
819
Direct NOAA county match
95.0%
2. GUILFORD
County FIPS 37081
At-risk Medicare count
4,283
Storm-event records
444
Direct NOAA county match
89.6%
3. MECKLENBURG
County FIPS 37119
At-risk Medicare count
5,368
Storm-event records
370
Direct NOAA county match
91.6%
4. FORSYTH
County FIPS 37067
At-risk Medicare count
3,518
Storm-event records
380
Direct NOAA county match
88.4%
5. RANDOLPH
County FIPS 37151
At-risk Medicare count
1,570
Storm-event records
410
Direct NOAA county match
90.5%
State-level utility structure from official EIA Form 861 data, shown as planning context alongside the weather and medical layers.
Data year
2024
Utilities in scope
54
Residential customers represented
4,932,239
96.2% of in-scope residential customers in North Carolina are served by utilities that report complete annual SAIDI and SAIFI pairs to EIA for 2024, excluding major event days.
GeneratorChecker does not blend statewide SAIDI or SAIFI values across IEEE and Other Standard reporters in this public layer.
This block identifies the utility structure behind the state, but it does not score your local grid reliability.
IOU
IOU
Cooperative
IOU
Cooperative
Model both a winter reliability case and a storm-season case before buying.
Critical loads for the first day of a hurricane outage: refrigeration, medical, communications, and air circulation.
Load
421W
Target
24h
Minimum
16,700 Wh
NC hurricane outages often extend beyond 24 hours. Have a solar recharge plan for day 2+.
Size this scenario in calculatorHeating-system support, communications, and medical continuity during a winter ice-storm outage.
Load
1189W
Target
48h
Minimum
93,800 Wh
This winter case assumes your home uses a gas furnace or boiler that still needs blower power. Consider expandable systems for extended coverage.
Size this scenario in calculatorCritical Note: No single portable power station in our database covers the full 24-hour baseline at this load (16,700 Wh target vs. 6,144 Wh max in our current database). Use solar recharge, load rotation, or expandable systems for longer events.
Using a single generic runtime target for both warm-season and winter-season outage drivers.
Ignoring water-management loads such as sump pumps during storm-heavy periods.
Missing startup surge requirements for blower motors and refrigeration compressors.
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Average hurricane outage lasts 3-7 days. Here's exactly what to run, how much battery you need, and which power stations handle a fridge + phone + fan.
A 1/2 HP sump pump surges to 3,243W at startup. Here is how to size a power station that will not trip when it matters most.
Composite score: 83.6 / 100
Rating: Relatively Moderate
Top modeled hazards: Ice Storm, Riverine Flooding, Hurricane
Hurricane score: 84.0
Winter Weather score: 78.0
Wildfire score: 53.8
Total (2014-2023): 19
Most recent: 2022-10-01 Hurricane
| Type | Count |
|---|---|
| Hurricane | 11 |
| Severe Storm | 3 |
| Biological | 2 |
| Fire | 2 |
| Severe Ice Storm | 1 |
Required Wh = (Total Load W × Target Hours / Inverter Derate) × Safety Factor
Inverter derate: 0.70 (30% real-world loss)
Safety factor: 1.15
Rounding: Up to nearest 100 Wh
North Carolina has an NRI composite risk score of 83.6 (Relatively Moderate), with 19 federal declarations from 2014 to 2023. NRI top hazard is Ice Storm, but Hurricane leads FEMA declarations with 11 of 19 total — a dual-season risk pattern.
For the primary scenario on this page (24-hour hurricane essential), the estimated minimum is 16,700 Wh for a 24-hour target. Refine this in the calculator with your actual devices.
NRI is a modeled risk index based on hazard exposure, vulnerability, and expected loss. FEMA declarations reflect federally declared incidents. They answer different questions — use both signals together for planning.
Designing for one weather pattern only and discovering gaps when a different hazard season hits. See the common mistakes section above for more state-specific pitfalls.
