If you are looking for how to save energy at home, the most effective starting point is understanding what your energy bill pays for and where your energy goes. Heating rooms and hot water together accounted for about 78% of UK domestic energy use in 2025, according to government statistics. Switching off lights helps, but it is a small piece of the puzzle compared with managing your heating and draughts.
Ofgem’s price cap for the last quarter of 2026 has just taken effect, and the rules on tariffs, smart meters and VAT matter for how much any change is worth. This guide focuses on the data, what it costs, and which measures make the biggest difference to your bills and your carbon footprint. All figures depend on your home and tariff; treat them as general information, not a promise of savings.
How energy bills and the price cap work
The energy price cap does not cap the total amount you pay; it caps the unit rates and standing charges your supplier can charge. This distinction matters because if you use more energy, your bill still goes up.
For 1 October to 31 December 2026, the Ofgem price cap for GB households paying by direct debit sets the average electricity unit rate at 26.32p per kWh with a standing charge of 54.83p a day, and the gas unit rate at 7.97p per kWh with a standing charge of 29.68p a day. Ofgem says the main driver of the latest rise was an 11% increase in the wholesale cost allowance, citing instability in the Middle East, extreme temperatures across Britain and Europe, risks to LNG supply and low wind output. Rates also vary by region.
Ofgem puts a typical annual dual-fuel bill for this period at £1,723, up 4% from £1,663 in July to September 2026. That is an illustration based on typical consumption of 2,500 kWh of electricity and 9,500 kWh of gas a year, not a limit on your bill. For standard credit customers the typical figure is £1,861, and for prepayment £1,678. The government has removed VAT from electricity bills (from 5% to 0%) between 1 October 2026 and 31 March 2027, while gas stays at 5%; Ofgem warns that electricity figures for this period therefore cannot be compared directly with earlier ones.
The cap is reviewed every three months and applies to Great Britain (England, Scotland and Wales) only. It does not apply in Northern Ireland.
Where your energy goes
The Department for Energy Security and Net Zero (DESNZ) published “Energy Consumption in the UK 2026” in September 2026, with a breakdown of domestic energy use for 2025.
Space heating accounted for 60.8% of all energy consumed in the UK domestic sector in 2025, and water heating a further 17.4%, so heating space and water together made up about 78%. Appliances accounted for 16.4%, cooking 4.4% and lighting 1.0% (shares calculated from the DESNZ end-use tables).
This hierarchy is crucial for prioritising your efforts. Choosing and using energy-efficient appliances is worthwhile, but it is unlikely to save as much as tackling your heating. The same report shows domestic electricity use rose by 2.6% in 2025. Domestic heat pumps used 2,280 GWh of electricity in 2025, 17% more than in 2024, though this was still only about 2.4% of domestic electricity.
Real-world examples and quantified savings
The Energy Saving Trust (EST) publishes a widely cited set of quick tips with estimated annual savings. These are EST’s own estimates, based on its average price assumptions drawn from recent Ofgem price cap periods (24.7p/kWh for electricity and 6.5p/kWh for gas in GB, as of September 2026), not on the October 2026 cap. Treat them as indications of relative value, not guaranteed savings.
EST says following all ten of its quick tips could save up to £313 a year for a GB household, while noting that not everyone can follow all ten. Its Northern Ireland figure is £368, because EST bases NI estimates on NI supplier tariffs; some individual NI figures are higher than GB ones and some lower.
EST’s estimated annual savings for GB include:
- Thermostat: turning the thermostat down from 22°C to 21°C can save £120 a year in GB, according to EST’s draught-proofing guide. This is a separate estimate, not part of the £313 quick-tips total, and the largest single figure here.
- Draught-proofing: professional draught-proofing of windows and doors saves around £55 a year, and a chimney draught excluder around £45. If your home is already fairly airtight, more draught-proofing may worsen indoor air quality, so keep ventilation such as trickle vents and extractor fans.
- Appliance use: switching appliances off standby saves about £45 a year. Avoiding the tumble dryer and drying clothes on a line or indoor rack saves £50. Washing at 30°C and doing one fewer wash a week saves £26 (EST gives this as a combined figure).
- Hot water: keeping showers to four minutes saves £45 a year. Swapping one bath a week for a four-minute shower saves £10. Topping up hot-water cylinder insulation, replacing a loose 25mm jacket with an 80mm British Standard jacket, saves £45.
- Lighting: replacing all halogen bulbs with LEDs saves around £45 a year and about 35kg of CO2. EST says LEDs use about 80% less electricity than halogens and can last up to 20 times longer. Turning lights off when you leave a room saves about £7.
- Kitchen habits: not overfilling the kettle saves £10, fitting a kitchen tap aerator £20, and running the dishwasher only when full (one fewer run a week) £10.
The role of technology: smart meters and tariffs
By the end of June 2026 there were over 42 million smart and advanced meters in homes and small businesses in Great Britain, 72% of all meters, according to DESNZ. Large suppliers operated 39 million smart meters in homes.
EST says smart meters are free to install, with costs recovered through bills, and are not compulsory. They come with an in-home display that shows electricity use in near real time and gas use every half hour. The government target is for suppliers to fit smart meters in all GB homes by the end of 2030.
Renters can get a smart meter if the energy bill is in their name, and should tell the landlord. If the bill is in the landlord’s name, it is the landlord’s decision.
Time-of-use tariffs
Time-of-use (ToU) tariffs charge different rates at different times of day. Static ToU tariffs such as Economy 7 offer seven cheaper overnight hours, typically used for storage heaters. Smart ToU tariffs need a smart meter, and prices can change every half hour with supply and demand. As an illustration, EST’s GB price assumptions (September 2026) put Economy 7 at 14.4p/kWh off-peak and 29.4p/kWh on-peak, against 24.7p/kWh for a standard single rate; actual tariffs differ.
These tariffs are not automatically cheaper. EST says they suit people who can shift use, for example charging an electric vehicle, using a home battery or running a heat pump in cheaper hours. If most of your use is fixed at peak times (such as 4–7pm) and you have no battery or EV, you may pay more. Ofgem says peak and off-peak rates together cannot exceed the cap. Check your half-hourly data from your supplier before switching.
The carbon intensity of the grid also varies by time of day. EST notes that at peak times, such as 5pm on a calm day, more electricity comes from gas, so emissions are higher, while overnight and windy periods have more renewables, including wind power, and lower emissions. Shifting use can therefore cut your carbon footprint as well as your bill. You can check the live GB electricity mix and carbon intensity to see when the grid is cleanest.
Limitations and honest assessment
The data gives clear direction, but behaviour change alone has limits.
First, the savings from appliances are small compared with heating. EST estimates about £45 a year for switching off standby, against £120 for turning the thermostat down by 1°C. If your home is draughty, unplugging gadgets will not make a big difference to your heating bill, which is why draught-proofing and insulation matter more.
Second, the cost of implementation matters, and EST’s own pages disagree on it. Its quick-tips page says professional draught-proofing can cost around £55, while its draught-proofing guide says around £250 for a whole house. At the higher figure and EST’s £55-a-year estimate, the payback would be roughly four and a half years by our own rough calculation. DIY draught-proofing is cheaper.
Third, the price cap changes every quarter. Ofgem attributes the October 2026 rise mainly to an 11% increase in the wholesale cost allowance. If wholesale prices rise or fall, unit rates follow, changing the value of any saving. Because EST’s figures use an average of recent caps, your actual savings may differ.
Finally, not every technology suits every home. Heat pumps are growing, though they used only about 2.4% of domestic electricity in 2025. Generating your own power, for example with solar panels, is a separate decision from cutting use; our guide to renewables at home covers the options.
The UK angle
The Ofgem price cap applies in Great Britain only. Northern Ireland is not covered, and EST gives separate NI savings figures based on NI supplier tariffs.
Northern Ireland has no GB-style smart meter rollout; EST says a Department for the Economy cost-benefit analysis proposed a six-year electricity smart meter rollout starting in 2027.
The removal of VAT on electricity bills runs from 1 October 2026 to 31 March 2027 and is temporary. Gas is still charged at 5% VAT. Figures for the next cap period, from 1 January 2027, will be set by Ofgem, so check the current rates before relying on any of the numbers above.
Frequently asked questions
What is the energy price cap from October 2026, and what does it mean for my bill?
From 1 October to 31 December 2026, the GB price cap sets average direct debit rates of 26.32p/kWh plus 54.83p a day for electricity and 7.97p/kWh plus 29.68p a day for gas. Ofgem’s typical annual dual-fuel bill is £1,723, up 4%. The cap limits rates and standing charges, not the total you pay; if you use more energy, you pay more. Electricity carries no VAT until 31 March 2027; gas stays at 5%.
Which energy-saving habit saves the most money in a UK home?
Of the EST figures in this guide, turning the thermostat down from 22°C to 21°C has the largest estimate, £120 a year in GB. That fits DESNZ data showing space heating accounted for over 60% of domestic energy use in 2025. Your saving will depend on your home and tariff.
Does turning the thermostat down by 1°C really save money?
EST estimates that reducing the temperature from 22°C to 21°C can save £120 a year in GB, based on its own average price assumptions. It also says draught-free homes feel comfortable at lower temperatures, so draught-proofing may make a lower setting easier to live with.
Is it worth switching appliances off standby?
EST estimates switching appliances off standby saves about £45 a year in GB. That is modest compared with heating, but it costs nothing. Leave fridges, freezers and some TV recorders switched on.
Will a smart meter lower my bills, and do I have to have one?
A smart meter does not change your unit rates by itself, but it shows your use in near real time, is needed for smart time-of-use tariffs and gives access to schemes such as the Demand Flexibility Service. EST says smart meters are free to install and not compulsory. At the end of June 2026, 72% of GB meters were smart or advanced, according to DESNZ.
Should I switch to Economy 7 or a smart time-of-use tariff?
Time-of-use tariffs can work out cheaper if you can shift use to off-peak times, such as charging an EV overnight or running a heat pump when electricity is cheaper. If most of your use is at peak times and you have no battery or EV, you may pay more. Check your half-hourly data with your supplier before switching.