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Energy bills are one of the largest fixed costs in most UK households, and since the price cap rises of recent years, they’ve become an even bigger share of monthly budgets. The average UK household spends around £1,600–£2,000 a year on gas and electricity combined — but there’s a wide range, and the difference between an efficient and an inefficient household running the same size home can be hundreds of pounds annually.
This guide covers practical, actionable ways to reduce your energy bills. Some require upfront investment; many cost nothing at all.
Understand Your Current Tariff
The first step is knowing what you’re paying. Check your latest bill or log into your energy account and look for:
- Your unit rate (pence per kWh for gas and electricity)
- Your standing charge (a fixed daily fee regardless of usage)
- Whether you’re on a fixed or variable tariff
Since the energy price cap was introduced by Ofgem, most households on variable tariffs pay at or below the cap. However, fixed-rate deals are sometimes available below the cap, and with a price cap that adjusts quarterly, locking in a good rate can save money if prices rise.
Use the Ofgem energy price cap checker to see what your capped rates should be, and compare against your bill.
Switch Supplier or Tariff
Energy switching was disrupted during the 2021–2022 crisis when many suppliers went under, but the market has stabilised. You can compare deals at:
- Ofgem’s accredited comparison sites (Uswitch, MoneySuperMarket, Compare the Market)
- Your existing supplier’s website — they sometimes offer loyalty deals that aren’t widely advertised
When switching, watch for:
– Exit fees on your current fixed deal
– Direct debit vs. credit balance — if you’re in credit, make sure you get it back
– Estimated vs. actual usage — comparison tools assume average usage; enter your actual figures for accuracy
| Tariff type | When it makes sense |
|---|---|
| Standard variable (default) | When fixed rates are higher; flexible to switch |
| Fixed rate | When rates are lower than the cap and you want certainty |
| Economy 7 / Economy 10 | If you use most electricity overnight (storage heaters, EV charging) |
| Green tariff | If carbon reduction is a priority; check what “green” actually means |
Use a Smart Meter
Smart meters are free to install (your supplier provides them at no cost) and give you real-time information about your usage in pounds and pence, not just units. This visibility alone tends to reduce consumption — research from BEIS found smart meter households use around 3% less electricity and 2% less gas on average.
Beyond visibility:
– No more estimated bills — you pay for what you actually use
– Time-of-use tariffs (like Octopus Agile) let you shift usage to cheaper overnight hours
– Prepayment mode lets you load credit rather than manage a monthly bill
If you don’t have a smart meter, contact your supplier to request one. It’s free.
Reduce Heating Costs (The Biggest Bill Driver)
Heating accounts for roughly 55–65% of the average UK energy bill. It’s where the biggest savings are.
Thermostat temperature: Every degree you reduce your thermostat by saves approximately 10% on heating costs. The Energy Saving Trust recommends 18–21°C as a comfortable range. Dropping from 22°C to 20°C can save £100–£150 a year in a typical semi-detached home.
Heating schedule: Heat your home when you need it, not around the clock. A boiler timer that heats for 30 minutes before you wake up and 30 minutes before you get home, then switches off an hour before bed, is more efficient than running continuously.
Thermostatic radiator valves (TRVs): These let you set different temperatures in different rooms — turn them down in spare bedrooms and rooms you don’t use regularly. If you don’t have TRVs, they’re inexpensive to fit (around £10–20 per valve) and typically pay back within a year.
Boiler servicing: An unserviced boiler runs less efficiently. Annual servicing (around £80–120) maintains efficiency and also catches problems before they become expensive breakdowns.
Draught-Proof Your Home
Draught-proofing is the cheapest insulation measure available and has some of the highest returns. Cold air coming in under doors and around windows forces your heating to work harder.
What to do:
– Door draught excluders — adhesive foam strips around door frames, or a draught excluder along the bottom. Cost: £5–15 per door.
– Letterbox draught excluder — a brush seal inside the letterbox can make a noticeable difference in hallways
– Window draught strips — foam or brush seals around window frames. Cost: £5–10 per window.
– Chimney balloons — if you have an unused fireplace, a chimney balloon blocks the flue. Cost: around £20–30.
Total cost for a typical house: £50–100. Annual saving: £50–150, depending on house size and draughtiness.
Improve Insulation Where Possible
Loft insulation is the most cost-effective insulation measure for most homes. Heat rises, and an uninsulated or thinly insulated loft loses a significant amount of heating. The recommended depth is 270mm of mineral wool. Installing it costs around £300–500, and the annual saving is typically £150–250. Many suppliers and the government’s Great British Insulation Scheme offer grants or subsidies — check gov.uk/improve-energy-efficiency.
Cavity wall insulation is relevant for homes built after around 1920 with unfilled cavity walls. It costs around £500–1,500 to install and can save £150–350 per year. Also potentially eligible for government subsidy.
Hot water cylinder lagging — if you have a hot water tank, an insulating jacket (around £15–20 from most hardware shops) can save £30–50 a year on water heating.
Reduce Electricity Usage
After heating, appliances and lighting make up the largest share of electricity costs. According to the Energy Saving Trust’s detailed household analysis, small changes compound significantly:
| Change | Annual saving (approx.) |
|---|---|
| Switch all bulbs to LED | £40–65 |
| Turn off devices instead of standby | £35–55 |
| Wash clothes at 30°C instead of 40°C | £25–35 |
| Run dishwasher at eco setting, only when full | £15–25 |
| Reduce tumble dryer use by 50% | £50–70 |
| Take showers instead of baths, 1 min shorter | £30–50 |
| Fill kettle only as much as needed | £10–15 |
These are individually small but add up to £200–300 a year with no lifestyle sacrifice.
Check Eligibility for Energy Support Schemes
Several government and supplier schemes exist to help with bills:
- Warm Home Discount: a £150 rebate on electricity bills, available to some low-income households and those receiving certain benefits. Applied automatically for some; others need to apply each year.
- Winter Fuel Payment: for those born before a certain date (eligibility rules have changed — check GOV.UK for current criteria)
- Cold Weather Payments: triggered automatically when temperatures drop below 0°C for 7 consecutive days
- Energy Company Obligation (ECO4): free insulation and heating improvements for low-income households. Your supplier can advise eligibility.
- Priority Services Register: free registration for those with medical conditions, disabilities, or who are over 70. Benefits include priority in emergencies and advance notice of planned outages.
Conclusion
Reducing your UK energy bill is a combination of quick wins and slightly longer-term changes — and most of the biggest savings don’t require significant upfront investment.
- Check your tariff against the Ofgem price cap, and compare alternatives — a better deal may be available
- Get a smart meter if you don’t have one — visibility of usage reliably reduces consumption
- Drop your thermostat by 1–2 degrees and heat only when you need to — this alone can save £100–200 a year
- Draught-proof doors and windows for under £100 — among the highest return-on-investment home improvements available
- Switch to LED, fix standby habits, and run appliances efficiently — small changes that collectively save £200+ a year with no lifestyle cost
Next read: Cutting energy bills is part of the bigger picture — read our guide on how to cut monthly expenses: /how-to-cut-monthly-expenses