Grid-Down Survival Guide: What to Do in a Long-Term Power Outage

Most people are prepared for a 4-hour outage (candles, phone battery, ordering food). Fewer are prepared for 4 days. Almost nobody is prepared for 4 weeks. Yet all three scenarios have occurred within recent history in North America — the 1998 Eastern Ontario Ice Storm, Hurricane Katrina, the 2021 Texas winter storm, and countless others. The difference between surviving comfortably and suffering severely is almost entirely determined by what you prepared before the event.

Phase 1: First 72 Hours

Hour 1: Assess and Secure

• Check scope: Is this your block, your neighbourhood, or regional? Check neighbours, look for utility vehicles
• Turn on your emergency radio — get official information before acting
• Don't open refrigerator unless needed — it maintains safe temperature for 4 hours closed
• Fill every available container with water from the tap (pressure may fail if the outage is widespread)
• Charge phones from car battery via USB if grid power is gone and portable batteries are depleted

Hours 1–24: Inventory and Triage

• Inventory: How many gallons of water do you have? How many days of food? What medications need refrigeration?
• Heating/cooling assessment: What is the outdoor temperature? How long before your home reaches an unsafe temperature without heat/AC?
• Battery status: What devices need charging? In what priority order?
• Light: Identify all flashlights, batteries, candles, lighters, and headlamps. Distribute to household members.
• Medical: Any medications needing refrigeration? Any medical equipment needing power? Identify workarounds now.

Phase 2: Days 2–14

Water Management

If you're on municipal water with above-ground storage towers, water pressure may persist for days after grid failure. If on a well, your pump is electric and stopped immediately. Daily water needs:

• Drinking: 0.5 gallon per person per day minimum
• Sanitation: 0.5 gallon per person per day
• Cooking: 0.25 gallon per person per day

If stored water runs low, see our water purification methods guide for filtering from natural sources.

Food Strategy

Eat in this order: (1) Fresh food first — anything that will spoil. (2) Refrigerated food (safe 4 hours; frozen food safe 48 hours in a closed freezer). (3) Canned and shelf-stable food. (4) Long-term storage (freeze-dried, rice, beans).

See our best emergency food supply guide and 3-month supply guide for what to have on hand.

Heat and Cooling

Temperature regulation is the top priority. Without heat in a northern winter, a home becomes uninhabitable in 6–24 hours depending on insulation. Options:

• Generator-backed gas furnace
• Wood stove or fireplace
• Propane/kerosene heaters (rated for indoor use only, with CO detector)
• Consolidate household into one room and use sleeping bags

Communications

Your emergency radio is your primary information source. Secondary: text messages (SMS works when voice calls fail on overloaded cell towers). Tertiary: local community contact (neighbours, community bulletin boards).

Phase 3: Weeks 3–12 (Extended Grid-Down)

Extended grid-down events are rare but not unprecedented. The DHS Critical Infrastructure Resilience framework identifies the electrical grid as the single most critical infrastructure system — a major failure affecting it cascades into water treatment, fuel distribution, food supply chains, and communications within days.

At week 3+, priorities shift from immediate survival to sustained self-sufficiency:

• Food production: Container gardening and sprouting for fresh nutrition
• Water collection: Rainwater harvesting, stream filtration
• Community: Neighbourhood resource sharing becomes critical — isolation is a survival liability
• Security: Protect your resources without antagonizing your community (you need both)
• Medical: Address non-emergency health issues before they become emergencies

For building out your full preparedness supply, see our food storage calculator, our guide to emergency water storage containers, and our complete budget emergency preparedness guide.