Save energy without living by candlelight
Smaller bills, smarter habits and no lectures about switching off the kettle. Here are the home energy questions we hear most often — answered in plain English.
Jump to the FAQsThe trick is knowing the difference between using less electricity and paying less for the electricity you use. A cheaper overnight tariff might cut costs without cutting your kWh, while good controls and efficient equipment can help with both.
Three sensible places to start
Hot water & heating
Electric showers, immersion heaters and direct electric heating can use a lot of energy. Check controls, schedules and insulation before changing equipment.
Standby & unnecessary running
Devices on standby still use some power. Prioritise equipment that's genuinely drawing energy, rather than obsessing over every tiny indicator light.
LEDs & smart controls
LED lighting uses much less power than traditional lamps. Timers, occupancy sensors and sensible scene settings reduce unnecessary hours of operation.
Home energy-saving FAQs
1. What uses the most electricity in a home?
It depends on what you have installed and how you use it. High-power equipment such as electric showers, immersion heaters, tumble dryers, ovens and direct electric heating can be significant contributors. An EV charger also uses substantial energy, but much of that is energy replacing petrol or diesel rather than ordinary household demand.
2. Do smart plugs actually save electricity?
They can — if they turn devices off when you otherwise would have left them running. Monitoring-only smart plugs also help identify hidden consumption. They don't magically make a kettle or heater more efficient, and the smart plug itself uses a little electricity.
3. Is it cheaper to run appliances overnight?
Only if your electricity tariff offers lower prices during those hours. Check your supplier's actual off-peak times, then schedule suitable appliances and EV charging accordingly. Avoid running appliances such as tumble dryers while asleep or away from home.
4. Is an immersion heater expensive to run?
A typical 3 kW immersion uses about 3 kWh for each full hour it is energised. A thermostat cycles it off when the cylinder reaches temperature, so actual consumption varies. Correct timers, cylinder insulation and a working thermostat matter more than simply switching it on and off at random.
5. Should I replace all my lights with LEDs?
Where older halogen or incandescent lamps are still in use, replacing them with compatible LEDs usually makes sense. For example, a 6 W LED running for five hours uses 0.03 kWh, compared with 0.25 kWh for a 50 W lamp. Always check dimmer and fitting compatibility.
6. Can a battery save money without solar panels?
Potentially. A battery can charge on a cheaper tariff and supply the home when rates are higher. However, it doesn't create energy: storage losses mean you buy slightly more kWh overall. The savings depend on the tariff difference, usable capacity, round-trip efficiency, installation cost and how much stored energy you actually use.
7. Should I switch everything off at the wall?
Switching off genuinely unnecessary equipment may help. Leave essential equipment such as refrigeration, security systems and required medical devices operating. For everything else, use an energy monitor to separate meaningful savings from negligible ones.
8. Do EV smart chargers reduce electricity consumption?
Smart scheduling mainly reduces the cost of charging by shifting it into a cheaper tariff window. Choosing an efficient charger and reducing avoidable charging losses also matters, but 1 kWh delivered to your vehicle remains 1 kWh regardless of the time of day.
9. Are timers worth installing?
Often, particularly for loads that need not operate continuously — such as immersion heaters, outside lights and some ventilation systems where controls are suitable. The best timer is the one whose schedule matches how you actually use the property.
10. How do I know whether an appliance is wasting electricity?
Review your smart-meter data, supplier app or a suitable plug-in energy monitor for plug-connected loads. Look for unexpected overnight baseloads and changes after operating individual devices. Fixed-wired equipment should be assessed with suitable professional test equipment.
One important distinction: cheaper isn't always lower energy
A 3 kW heater running for two hours consumes 6 kWh whether it operates at 2pm or 2am. The tariff changes the bill, not the energy used.
That is why a sensible plan looks at both efficiency (less kWh) and load shifting (cheaper kWh).
Useful NOD services and guides
Want a home that works a little smarter?
Whether it's LED lighting, a better immersion-heater schedule, smart EV charging or home battery storage, we can advise on practical electrical improvements for your property.
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