If the Electricity Went Off on a Cold October or November Evening, What Would Stop Working?

“A power cut doesn’t just turn the lights off anymore—it can turn the house off.”

It is half past six on a dark autumn evening. The curtains are closed, dinner is cooking and the heating has begun to make the house comfortable.

Then everything goes quiet.

The lights going out are obvious. But the heating has also stopped. The internet has disappeared. The electric hob is useless. The garage door may need opening manually, and the telephone plugged into the router may no longer make calls.

Your mobile phone still works—for now.

We have already considered what belongs in a resilient household cupboard. But food is only one part of preparedness. We also need to understand the systems that make our homes work.

What depends on electricity, what has a backup, and does everyone in the household know what to do?

Most power cuts are local and short-lived. A little preparation can make those interruptions much easier to manage, while also helping if disruption lasts longer.

Start With a Walk Around Your Home

Before buying anything, take a notebook and walk from room to room.

Imagine that the electricity has just failed. For each important appliance or system, ask:

• Does it stop immediately?

• Does it have a battery, and how long will that last?

• Is there a manual alternative?

• What happens when the electricity returns?

Include equipment that is easy to overlook.

Household system	What to check
Heating and hot water	Boiler or heat-pump electricity supply, pumps and controls
Lighting	Accessible torches, battery lamps and safe routes around the home
Communications	Router, fibre connection box, digital telephone and mobile charging
Cooking	Hob, oven, microwave, kettle and a meal requiring no cooking
Access	Garage doors, powered gates, electronic locks and manual releases
Health and accessibility	Medical equipment, telecare, stairlifts and their backup arrangements
Security	Alarm batteries, cameras and dependence on Wi-Fi
Other essential systems	Sump pumps, pumped drainage, aquariums or specialist equipment

A useful discovery might be as simple as realising that your only torch is in the garage—and the garage door is electrically operated.

That costs nothing to put right.

“We Have Gas Heating, So We’ll Be Fine”—Will You?

The fuel your heating uses does not tell you everything about its electricity needs.

Most modern gas boilers depend on electricity for controls, ignition and circulation. The gas supply may still be available, but without electrical power the heating will generally stop. Heat pumps also need electricity to operate. UK Power Networks specifically includes boilers, heat pumps and broadband among the household services affected by a power cut.

A battery-powered thermostat does not change that. It may still display the room temperature while the equipment it controls has no power.

Hot water needs a separate check. A combi boiler will generally stop producing it. A cylinder may retain previously heated water, although whether you can use it normally depends on the plumbing and any pumps.

The practical question is: how does your particular heating and hot-water system work?

Warmth Already in the House Becomes Valuable

The heating stopping does not mean the house instantly becomes cold.

Warm walls, floors, furniture and stored water continue to release heat. How quickly the temperature falls depends on the building, the weather and how much heat escapes.

This gives insulation and draught reduction another purpose: they can make a home more comfortable during an interruption.

For a short outage, layered clothing, blankets, closed curtains and gathering in a suitable room can help. Keep required ventilation clear.

Also remember that an electric blanket or heated throw needs electricity. An ordinary blanket does not.

Think ahead about where you could go if the house became too cold. A nearby relative outside the affected area may offer a better option than trying to manage indefinitely at home. Citizens Advice recommends considering this before a power cut occurs.

Losing the Internet Can Also Mean Losing the Telephone

A charged laptop does not keep your Wi-Fi working. The router needs power, and a fibre installation may have a separate connection box that also requires electricity.

A digital landline usually depends on this equipment too.

Ofcom advises that home broadband and digital landlines will not work during a power cut without an additional power source. If you depend on your landline and lack a working mobile or reliable mobile signal, contact your provider about a suitable resilience solution.

Backing up the equipment inside your home also cannot guarantee that the network outside remains available.

For everyday preparation:

• Keep a charged power bank and the correct phone cable together.

• Write important numbers on paper.

• Agree how relatives will check on one another if calls fail.

• Keep essential instructions available offline.

A beautifully organised emergency plan stored only in the cloud has an obvious weakness.

Your Kitchen May Lose More Than the Oven

Electric hobs, kettles, microwaves and air fryers all stop without backup power.

Gas cooking also needs checking. Some appliances depend on electrical controls or safety systems. A hob may permit manual lighting, but only follow that appliance’s instructions; do not assume every gas cooker can be used this way.

For a short interruption, having something suitable to eat without cooking is often the easiest answer.

Do not bring a barbecue or outdoor camping stove indoors, or use a cooker to heat the house. Citizens Advice specifies outdoor use for camping and portable gas stoves.

Keep fridge and freezer doors closed as much as possible. Their contents do not immediately become warm when the electricity stops.

Can You Still Get In—and Out?

Powered doors and gates deserve attention before a dark, wet evening makes them urgent.

Find the manufacturer’s instructions for any manual release. Check where keys are kept and whether you can reach the release from the side where you might be standing.

For a garage, ask:

If the powered door were closed and I were outside, how would I get in?

Do not improvise with heavy doors or unfamiliar mechanisms. Have anything unclear demonstrated while the system is working normally.

The same principle applies indoors. Check accessibility equipment and battery arrangements individually rather than assuming that every stairlift, alarm or powered aid behaves alike.

Solar Panels Do Not Automatically Keep the House Running

This is one of the most important misunderstandings to resolve.

A conventional grid-connected solar installation normally stops supplying the home when the grid fails. Its inverter disconnects so that it cannot energise the public network while engineers may be working on it.

A system designed for safe operation independently of the grid can behave differently. National Grid distinguishes installations with standby or island capability from those designed to shut down during an outage.

There is also a simpler limitation on an October or November evening: after dark, the panels are not generating.

Any overnight backup must therefore come from stored energy or another suitable source.

A Battery on the Wall Is Only Part of the Answer

For me, this is particularly relevant. Our home has solar panels, substantial battery storage and a heat pump. That makes understanding the connections and controls just as important as knowing how much energy the batteries can store.

Battery storage installed to reduce bills does not, by itself, tell you what will work during a power cut.

Backup may require additional equipment and wiring, often purchased as an extra. Depending on the installation, it might supply one dedicated socket, selected circuits or a wider part of the home. Changeover may be automatic or may require a documented manual procedure.

Ask your installer to explain:

1. Which sockets and circuits remain live?

2. Does backup start automatically?

3. If a manual action is needed, who can perform it and how?

4. What is the maximum backup power output?

5. How much battery charge is reserved for an outage?

6. Can solar recharge the battery while the grid is unavailable?

Have the installer demonstrate the commissioned arrangement. Do not experiment with wiring or attempt to feed electricity into household sockets.

The useful result is a short set of instructions that another household member can understand.

Battery Capacity and Power Output Are Different

Two figures matter:

Capacity, measured in kWh, describes how much energy is available.

Power output, measured in kW, describes how much equipment can run at once.

Consider an illustrative backup system with 2 kWh of usable energy available at its output:

Average demand	Idealised running time
100 W	20 hours
500 W	4 hours
2,000 W	1 hour

These are arithmetic examples, not promises. Actual performance depends on equipment consumption, battery reserves, conversion losses and operating conditions.

The system must also support the appliance’s instantaneous demand, including any starting surge.

That is why a battery capable of keeping a few lights and communications equipment running may be unsuitable for a kettle, electric heater or heat pump.

Choose the essential services first, then assess the backup needed to support them.

Put Health and Accessibility Needs First

For some households, electricity loss creates an immediate care problem.

Anyone relying on powered medical equipment should agree a specific outage plan with their care team and equipment provider. This should cover backup duration, warning signals, contacts and what happens before the backup runs out.

Check telecare arrangements too.

Eligible households can register for additional support with their energy supplier and network operator through the Priority Services Register. Registration provides support; it does not guarantee an uninterrupted supply. Government guidance recommends preparing medical-equipment arrangements with care providers in advance.

Make a One-Page Household Power-Cut Plan

A useful plan should be short enough to read by torchlight.

Our household power-cut plan

Item	Our arrangement
Torches and battery lamps	Where they are kept and when checked
Essential contacts	Written numbers for relatives, neighbours and relevant providers
Power-cut reporting	105 in England, Scotland and Wales
Warmth	Blankets, clothing and the room we would use
Communications	Charged power bank, cables and agreed check-in arrangements
Food	One meal requiring no cooking
Access	Keys and manufacturer’s manual-release instructions
Backup power	Supported circuits, operating instructions and limits
Health needs	Agreed care plan and equipment contacts
If we need to leave	Where we would go and how we would travel

Keep a printed copy somewhere familiar.

For readers in Northern Ireland, the power-cut reporting number is 03457 643643. These reporting routes are listed in the Government’s Prepare guidance.

Rehearse the Decisions Before You Need Them

Try a short discussion one evening while everything is working.

Imagine the power has failed and work through the first few minutes:

Who fetches the lights? Who checks on a vulnerable relative? Can you find the door keys? Does everyone know which backup sockets work?

There is no need to cut the electricity to conduct this exercise. Arrange any actual backup-system test with the installer, particularly where medical equipment or accessibility needs are involved.

If an outage occurs, switch off cooking and heating appliances that could become hazardous when power returns. Once the supply is restored, check important systems have resumed normally. Government guidance includes turning off appliances such as ovens, electric fires and fryers during an outage.

The Best Preparation Begins With Understanding

Going green has encouraged many of us to examine how much energy we use. Resilience asks a related question:

Which services matter most when that energy is temporarily unavailable?

There is a useful overlap. Insulation slows heat loss. Efficient lighting stretches stored energy. Understanding household demand helps us make better decisions about both bills and backup.

My starting point would be a walk around the house, a few questions and a sheet of paper.

Find the hidden dependencies. Check what the equipment actually does. Put simple alternatives within reach.

A power cut may turn off the electricity. A little preparation can help keep the household functioning. A Power cut will most probably happen when you batteries need charging!