When the hydro goes out, deal with safety and information first, then protect food, heat, communications and other critical loads. Canada's emergency guidance recommends households be prepared to cope for at least 72 hours. Backup power can help with selected electrical needs, but it does not replace official instructions, safe generator use, medical planning or qualified electrical work. Use the timeline below to decide what matters in the first minutes, the first four hours, overnight and during a multi-day outage.
What Should You Do First When the Hydro Goes Out?
First confirm that the problem is an outage rather than an electrical fault in your home, check for immediate hazards and use your utility's official outage channels for status. Keep a flashlight accessible, preserve phone battery and avoid opening the refrigerator unnecessarily.
If you smell gas, see downed lines, have flooding near electrical equipment or face another immediate hazard, move to safety and follow local emergency instructions. Do not improvise electrical connections. Government of Canada guidance specifically recommends getting advice from a licensed electrician before installing a generator or transfer equipment.
If winter temperatures are involved, also think about frozen pipes and loss of heating equipment. Canada's power-outage preparedness guidance identifies outages as a risk to heating, communications and household systems and recommends preparing to manage without normal services.
Start with hazards, not appliances. Check for fire, carbon-monoxide alarms, downed lines, flooding, unusual electrical smells and anyone who relies on powered medical equipment. If the outage is part of a wider emergency, follow instructions from local authorities and your utility before focusing on household comfort.
First 15 Minutes: Safety, Reporting, and Information Sources
In the first 15 minutes, the goal is to establish situational awareness without wasting stored energy. Use the outage map, app or phone line of your local utility, then check Environment and Climate Change Canada alerts if severe weather is involved.
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Confirm the outage: check whether neighbours or the utility are also reporting loss of power.
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Turn off or unplug sensitive loads: reduce the chance of unnecessary load when power returns.
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Keep one light switched on: it can indicate that service has been restored.
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Preserve communications: lower phone brightness, disable unnecessary radios/apps and keep a charged battery bank available.
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Check CO and smoke alarms: especially if anyone is considering fuel-burning equipment.
Never use a fuel-burning generator indoors, in a garage, shed or other enclosed or partly enclosed space. Health Canada advises operating portable generators at least 6 metres (20 feet) from buildings, with exhaust directed away from openings.
Use battery lighting instead of candles where practical, put phones on low-power mode and note the utility outage-reporting channel before mobile networks become congested. If you have backup power, do not energise everything at once; reserve capacity for the loads that matter most.
0–4 Hours: Protect Food, Heat, Communications, and Critical Loads
During the first four hours, avoid spending battery capacity on convenience loads. Keep the refrigerator and freezer closed, maintain communication and decide whether your heating or medical situation requires a faster escalation.
Health Canada says an unopened refrigerator will keep food cold for about four hours. A full freezer can maintain temperature for roughly 48 hours and a half-full freezer for about 24 hours if kept closed. Those are food-safety reference points, not appliance-runtime guarantees.
For heat, follow the operating instructions of your heating equipment. Many central furnaces need electricity for controls and blowers even when the fuel source is natural gas or oil. Do not connect a furnace or other hard-wired load to a portable power source with improvised wiring; that decision belongs with the equipment documentation and, where required, a qualified electrician.
Your first electrical priorities are normally communications, essential lighting and any medically necessary equipment with an approved backup plan. If you need to estimate whether a battery can support those loads, use the separate backup power sizing worksheet.
4–24 Hours: Decide What Must Stay Powered
After several hours, move from "wait and see" to a critical-load plan. Identify which appliances must run, how many watts they draw while operating, whether they have startup surges and how many watt-hours they consume over the next 12–24 hours.
A refrigerator is a common example because it cycles rather than drawing its rated running power continuously. Use the dedicated fridge runtime calculator instead of assuming a battery's watt-hour rating equals refrigerator runtime.
| Load | Question to answer | Priority decision |
|---|---|---|
| Phone / modem / router | How long must communication remain available? | Usually high priority |
| Refrigerator / freezer | How long can food remain safely cold without power? | High once outage extends |
| Heating system | Does the system require electrical controls/blower and an approved connection? | Potentially critical in winter |
| Medical device | What does the manufacturer and care plan specify? | Critical; follow medical guidance |
| Entertainment / discretionary loads | Can it wait? | Low priority |
At this stage, manage energy deliberately. Run only the loads that protect food, communication, basic lighting, heat-related safety or medical needs, and track which devices are drawing from backup power. Avoid repeatedly opening the refrigerator or freezer just to check temperatures.
24+ Hours: Plan for a Longer Outage
For a multi-day outage, energy supply becomes only one part of the plan. Reassess water, food, heat, medications, sanitation, communications and whether the home remains safe to occupy. Canada's preparedness guidance is built around households being ready for at least 72 hours because restoration time can be uncertain.
If you are relying on batteries, calculate remaining stored energy and realistic recharge options. Solar can help only when panel compatibility, daylight, weather, placement and charge limits all cooperate; do not budget around rated panel output as if it were available continuously. Vehicle charging also depends on the equipment and driving plan.
If the home is getting dangerously cold, someone needs powered medical equipment beyond the available backup, or local authorities advise evacuation, the correct decision may be to relocate rather than stretch a battery system further.
During a long outage, keep a simple written log of battery state, major loads, fuel use if a generator is involved, refrigerator temperature and utility updates. That record helps you stretch limited energy and decide whether the household should move to a safer location.
Outage Action Timeline: First 15 Minutes → Multi-Day
Use this timeline as your core outage decision tool. It separates urgent safety from energy management so you do not spend the first hour calculating watts while missing a more important problem.
| Time | Main objective | Actions | Backup-power role |
|---|---|---|---|
| 0–15 min | Safety + information | Check hazards, report/check outage, preserve phone, use flashlights | Keep small essentials available; no rushed rewiring |
| 15 min–4 h | Protect essentials | Keep fridge closed, monitor indoor temperature, check critical needs | Power communications/approved critical devices if needed |
| 4–24 h | Allocate energy | Build critical-load list, estimate Wh, decide what cycles on/off | Match battery energy and output to selected loads |
| 24–72 h | Sustain or relocate | Reassess food, water, heat, medical needs, recharge, local guidance | Use recharge/expansion only if the home remains safe |
| Multi-day | Long-duration resilience | Follow authorities, arrange supplies or alternative accommodation | One part of a broader emergency plan |
When utility power returns, bring loads back in stages rather than all at once. Check for abnormal smells, tripped breakers or damaged equipment before resuming normal use, and recharge emergency batteries so the household is ready if service drops again.
Where Backup Power Fits—and Where Official Safety Guidance Comes First
Battery backup is most useful when you have already identified critical loads and can connect them safely. It is not a reason to power every appliance in the house, and it is not a substitute for a transfer switch or other approved connection where a hard-wired circuit is involved.
For higher-demand home scenarios, the BLUETTI Apex 300 is currently listed at 3,840W output and 2,764.8Wh capacity. The Elite 400 is listed at 2,600W and 3,840Wh, trading lower output for more onboard energy. A compatible B300K adds 2,764.8Wh to supported Apex 300 configurations. These are sizing examples, not whole-home guarantees: actual fit depends on startup loads, total energy demand, connection method and recharge plan.
For Ontario-specific outage resources and kit planning, use the separate Ontario power outage preparedness page rather than duplicating provincial content here.
Also separate "portable plug-in backup" from "building-circuit backup." Plugging a refrigerator or modem directly into a suitable portable power station is different from supplying a furnace, panel or hard-wired circuit. The latter can require approved transfer equipment and qualified electrical work. Never use improvised backfeeding through a receptacle.
Frequently Asked Questions
What should I unplug first during a power outage?
Start with non-essential and sensitive equipment that does not need to restart automatically. Keep one light available as a restoration indicator. Follow the manufacturer's instructions for major appliances and local utility guidance for unusual electrical conditions.
How long is food safe in the fridge during a power outage?
Health Canada says an unopened refrigerator keeps food cold for about four hours. Keep the door closed and use official food-safety guidance rather than smell or appearance alone to decide whether perishable food is safe. If the outage continues, use official food-safety guidance and temperature checks rather than smell or appearance alone.
Which loads should backup power support first?
Prioritize life safety and medical needs, communications, essential lighting, refrigeration as the outage extends, and heating-related equipment where connection is approved. Optional entertainment and high-draw convenience loads come later. Keep optional entertainment and other convenience loads off until critical needs are secure and the remaining energy is understood.
When should I follow official guidance instead of a backup-power plan?
Always follow official guidance when there is a safety hazard, evacuation notice, carbon-monoxide risk, flooding, downed electrical lines, unsafe indoor temperature or a medical situation beyond your approved backup plan.
Conclusion
A hydro outage is easier to manage when you separate time-critical safety decisions from power sizing. Secure the first 15 minutes, protect food and communications for the first four hours, build a critical-load plan for overnight use, and reassess the whole household if the outage becomes multi-day. Use stored energy to support that sequence, not to delay a safety decision when the home, heat or medical situation becomes unsafe.