Most household emergency plans treat a power outage as a 72-hour inconvenience. A Category 4 hurricane, major ice storm, substation attack, or severe geomagnetic event can produce outages lasting 2–6 weeks. The preparation gap between “lights off for a weekend” and “grid down for two weeks” is enormous — and the decisions that matter (generator sizing, fuel storage, medical device power) must be made before the outage begins. This guide covers the specific numbers and choices for a realistic 14-day power outage.
Outage Duration by Cause
| Cause | Typical outage duration | Geographic scope |
|---|---|---|
| Summer thunderstorm (wind/lightning) | 4–48 hours | Local (1–50 sq miles) |
| Major hurricane (Cat 3+) | 1–4 weeks | Regional (thousands of sq miles) |
| Ice storm | 3–21 days | Regional (1998 Quebec Ice Storm: 4–6 weeks in some areas) |
| Heat wave (grid demand overload) | Rolling 4–24 hour windows | Multi-state |
| Physical attack on substations | Weeks to months (transformer lead time: 12–18 months) | Regional |
| Carrington-class geomagnetic event | Months to years (grid infrastructure damage) | Continental or global |
The realistic planning window for most households is 2–3 weeks. High-end scenarios (substation attack, major geomagnetic event) require deeper preparation that most households won’t achieve — but building for 14 days covers 95% of realistic power emergencies.
Power Prioritization: What Actually Needs Electricity
Before selecting a generator or battery system, identify your actual power requirements in priority order:
- Tier 1 — Life-critical: Medical devices (CPAP: 30–60W; oxygen concentrator: 150–300W; insulin refrigerator: 30–60W; home dialysis: 500–2,000W). No substitution possible.
- Tier 2 — Food preservation: Refrigerator (100–200W running, 300–500W surge); chest freezer (30–100W). Running 8 hours per day maintains food safety.
- Tier 3 — Communications: Phone charging (5–20W); NOAA weather radio (battery-powered, no grid needed); ham radio transceiver (20–100W transmitting).
- Tier 4 — Lighting: LED work lights (5–20W each); headlamps (battery-powered, no grid needed).
- Tier 5 — Comfort: Box fans (50–100W); electric blanket (50–150W); portable AC window unit (500–1,500W).
Generator Selection: Inverter vs. Conventional
Two generator categories matter for residential use:
Inverter generators (Honda EU2200i, Yamaha EF2200iS, Westinghouse iGen2500): Produce clean sine wave power (safe for sensitive electronics). Run at variable RPM based on load, giving 50–70% better fuel efficiency than conventional. At 50% load, a 2,200W inverter generator uses approximately 0.10 gallon per hour. Quiet (48–57 dB). Ideal for most residential needs. Cost: $800–1,200.
Conventional open-frame generators (Champion 3500W, DuroMax XP4400): Run at fixed 3,600 RPM. Higher wattage for lower cost. Use 0.20–0.35 gallon per hour at full load. Louder (68–76 dB). Better if you need to run a well pump or large loads. Cost: $400–700.
Fuel math for 14 days (inverter generator at 50% load, 8 hrs/day):
0.10 gal/hr × 8 hr/day × 14 days = 11.2 gallons. Two 5-gallon approved fuel cans with stabilizer cover 14 days of refrigerator + device charging use. Store fuel with PRI-G or STA-BIL stabilizer — untreated gasoline degrades in 30–60 days.
Generator safety rule: Run generators outdoors only, minimum 20 feet from any window or door. Carbon monoxide from generators kills more people after storms than the storms themselves — the 2017 Hurricane Maria aftermath killed dozens from generator CO poisoning.
Battery Banks and Solar: Grid-Independent Power
Battery power stations (EcoFlow DELTA, Jackery Explorer, Goal Zero Yeti) are quieter and safer indoors than generators. They recharge from solar panels, car 12V, or wall outlet before an outage.
| Unit | Capacity | What it runs | Recharge from solar | Price |
|---|---|---|---|---|
| EcoFlow RIVER 2 Pro | 768 Wh | Phone × 60, CPAP × 12 hrs, fridge × 6 hrs | 160W panel, ~5 hrs | ~$500 |
| EcoFlow DELTA 2 | 1,024 Wh | Fridge × 8 hrs, CPAP × 18 hrs | 220W panel, ~5 hrs | ~$700 |
| EcoFlow DELTA Pro | 3,600 Wh | Fridge 3 days, small AC unit 4–5 hrs | 1,600W max input, ~3 hrs | ~$2,500 |
| Whole-home battery (Tesla Powerwall 3) | 13,500 Wh | Whole house 12–24 hrs at normal load | Solar integration, continuous | ~$11,500 installed |
Solar panel output is not constant: A 200W panel in full sun produces 200W — but average daily output in the continental US is 4–5 peak sun hours, meaning a 200W panel yields 800–1,000 Wh per day. Clouds, angle, and shade reduce this significantly. Size your solar input to cover daily consumption with 25–30% margin.
Food Safety During Power Outage
USDA food safety rules for grid-down conditions:
- Refrigerator: Keeps food safe for 4 hours with door closed after power loss. Above 40°F (4°C), bacteria multiply rapidly. If power is out longer than 4 hours: move critical items to a cooler with ice, eat refrigerated perishables first, discard any item that has been above 40°F for more than 2 hours.
- Freezer (full): Keeps food safe for 48 hours if unopened. Half-full freezer: 24 hours. If meat still has ice crystals and is 40°F or below when power returns, it can be refrozen.
- Never taste-test: Food that smells and appears normal can still cause illness. “When in doubt, throw it out” is the correct rule.
Freezer strategy: A chest freezer full of water jugs (frozen solid) extends food-safe duration and serves as an ice reservoir. A 7 cubic foot chest freezer full of water can keep food safe for 72+ hours without power — and provides drinking water as ice melts.
Water Access During Extended Outages
Municipal water systems are gravity-fed (safe during most outages) or pump-pressurized (fails without power). Know which system serves your address:
- Gravity-fed (elevated reservoir): Water continues flowing for days to weeks based on reservoir size. Pressure may drop but service continues.
- Pump-pressurized: Loses pressure within hours. Most urban systems have backup generators on booster stations, but booster generators may run out of fuel.
- Private well: Completely dependent on power. Without a generator or hand pump, a well is inaccessible. A Simple Pump or Bison Pump hand pump ($400–800) provides well access without electricity.
Water storage for extended outages is covered in detail in long-term water storage: tank sizing, rotation protocol, and chemical treatment. The minimum for a 14-day outage is 28 gallons per person (1 gallon/person/day for drinking and hygiene).
Medical Device Power Planning
Households with electricity-dependent medical equipment need a detailed power plan before any emergency:
- CPAP/BiPAP: Typical power draw 30–60W. An EcoFlow RIVER 2 (768 Wh) runs a CPAP for 12–24 nights. Most CPAP manufacturers sell DC adapter cables that run directly from a 12V battery or car port.
- Home oxygen concentrator: Power draw 150–600W depending on flow rate. Requires a generator or large battery bank. Maintain a 4-hour backup oxygen cylinder supply as a bridge.
- Insulin refrigeration: Insulin is stable at room temperature for 28 days (unopened vials) and 28–56 days after opening, depending on type. Check specific insulin type — most modern insulins don’t require refrigeration for short-term use at temperatures below 77°F (25°C).
- Home dialysis (peritoneal): High power requirement; requires a dedicated generator. Contact your dialysis provider for their emergency protocol — most have arrangements for in-center treatment during extended outages.
Register with your utility’s medical baseline program — most utilities maintain priority restoration lists for customers with documented medical equipment needs.
Communications Without Internet and Cell
Extended grid failures often take down cell towers (most have 4–8 hour battery backup and no refueling plan). Reliable communications options:
- NOAA Weather Radio (battery or hand-crank): Broadcasts 24/7 from NWS transmitters on 7 dedicated frequencies. The Midland WR120 ($25) has a battery backup and alert tone. Cell towers going down does not affect NOAA radio.
- AM/FM radio: Local stations broadcast emergency information. AM travels farther at night — distant stations with emergency broadcasts are reachable. Keep a battery-powered AM/FM radio.
- Text over voice: SMS texts transmit successfully on congested cell networks when voice calls fail. Send texts first; conserve battery by turning off WiFi and limiting data when cell is marginal.
- GMRS/FRS radios (Motorola T600, Midland GXT): Line-of-sight communication with neighbors or family within 1–2 miles. No infrastructure required. GMRS requires an FCC license ($35, no test, covers family).
- Ham radio: With a Technician license (~$15 fee, 35-question test), you can access repeaters that extend range to 50–100+ miles. The Baofeng UV-5R ($25) covers 2m/70cm bands. Ham radio operators historically provide emergency communications infrastructure when all else fails.
14-Day Grid-Down Supply Checklist
- Generator (inverter preferred) + 15 gallons fuel + stabilizer + proper fuel cans
- Battery power station (EcoFlow DELTA 2 or equivalent, 1,000+ Wh) + 200W solar panel
- 28 gallons water per person (storage; see long-term water storage guide)
- 14-day food supply (shelf-stable; see hurricane supply list for quantities)
- LED headlamps (2 per person) + spare batteries or USB rechargeable
- NOAA weather radio (battery-powered)
- Battery bank (30,000+ mAh) for phone charging
- 30-day medication supply for all household members
- Coolers + ice (or chest freezer water jugs) for food transition period
- Cash ($300–500 in small bills) — card readers and ATMs go offline
Where to Go Next
Generator sizing detail, solar panel sizing math, and whole-home battery options are in emergency power: generators, solar panels, and battery banks. Winter-specific heating failure preparation during power outages is in winter storm preparedness: blizzard, ice storm, and heating failure. Long-term water storage for grid-down scenarios is in long-term water storage: tank sizing, rotation protocol, and chemical treatment.
