How to cut your energy bills

Reviewed: July 2026Tax year: 2026/27Topic: Bills & Energy

Most UK households feel energy costs before almost any other bill. The good news is that a large share of overpaying is avoidable: estimated bills from missed readings, staying on an expensive out-of-date deal, or using heat and hot water wastefully. This guide explains how the Ofgem energy price cap works in broad terms, why meter readings matter, and how to compare options calmly. It is general information only — tariffs, support schemes and regional details change, so always check your supplier and official sources before you switch or claim anything.

What the Ofgem price cap actually limits

In Great Britain, Ofgem's default tariff price cap sets maximum unit rates and standing charges that suppliers can charge on standard variable tariffs for typical payment methods. It is usually updated quarterly. Importantly, it does not cap your total bill: if you use more units, you still pay for them. A fixed deal may sometimes be cheaper or more predictable than the capped variable rate — and sometimes it will not. Treat comparison as a maths exercise, not a loyalty test.

Northern Ireland has a different regulatory framework, so advice and comparison tools aimed at England, Scotland and Wales may not apply one-for-one. Wherever you live, read the small print on exit fees, payment method (Direct Debit vs pay-as-you-go) and whether dual-fuel discounts are genuine or marketing padding.

For current figures and plain-English explainers, start with Ofgem and the energy section on GOV.UK. MoneyHelper also publishes independent guidance on switching and support if you are struggling to pay.

Meter readings beat estimates every time

Estimated bills are one of the most common ways people drift into debt or build a surprise credit. If your supplier has not had a recent reading, it guesses usage from past patterns — which fails when seasons change, guests stay, or you work from home more. Submit readings on the schedule your supplier asks for, photograph the meter if there is any dispute, and keep a simple log.

Smart meters can automate readings, but they are not magic: check the in-home display (or app) so you understand peaks, and still query anything that looks wrong. Prepayment customers should watch for standing-charge build-up in summer and ask about debt recovery rates if balances feel stuck.

When you move home, take a final reading on the day you leave and pass it to both suppliers in writing. Lost "move-out" readings are a classic source of months-long chasing.

Compare tariffs without rushing

Use at least two comparison routes and your own annual usage (kWh for gas and electricity) from a recent bill. Sort by total estimated cost for your usage, not the headline "typical household" figure. Check:

• Unit rates and daily standing charges separately
• Exit fees and remaining contract length on your current deal
• Whether the quote assumes Direct Debit
• Warm Home Discount or other support eligibility if relevant

If you are vulnerable, of pension age, or rely on medical equipment, ask about the free Priority Services Register with your supplier. That does not cut the unit price by itself, but it can improve support during outages.

Habits that reliably reduce kWh

Behaviour changes compound. Lower the thermostat by 1°C if you can stay comfortable; heat the rooms you use; bleed radiators; close curtains at dusk in winter; and use a timer on immersion heaters. For electricity, shift flexible loads (washing, dishwasher) away from peak if you are on a time-of-use tariff — but only after you understand the rate card.

Insulation and draught-proofing often beat gadget spending. Check GOV.UK for any current grants or scheme names in your area before paying for surveys you do not need. Avoid "guaranteed huge savings" cold calls; energy scams frequently impersonate suppliers or Ofgem.

Worked UK example: readings + a careful compare

Step-by-step checklist

• Find your latest bill and note annual gas and electricity kWh
• Submit a meter reading (or confirm smart readings look right)
• Check whether you are still in a fixed contract and any exit fee
• Compare at least two sources using your real usage, not averages
• Ask about Warm Home Discount and Priority Services Register if relevant
• Set a calendar reminder to review again when the cap or your fix ends
• Keep screenshots of quotes and confirmation emails

Common mistakes

• Treating the price cap as a promise that your total bill cannot rise
• Switching on a headline monthly figure without matching kWh and standing charges
• Ignoring exit fees that wipe out year-one savings
• Letting estimated readings run for seasons so Direct Debits drift

When to get regulated help

If you cannot afford your energy, contact your supplier early and check support options on GOV.UK. Independent guidance is available from MoneyHelper. For tariff rules and consumer protections, see Ofgem. This page is not personalised advice.

Frequently asked questions

Does the Ofgem price cap mean I should never fix?

No. The cap limits rates on default variable tariffs; a fixed deal can still be cheaper or more predictable for some households, and more expensive for others. Compare using your own usage.

How often should I send meter readings?

Follow your supplier's request — monthly is common if you do not have a working smart meter. Always read on move-in and move-out days.

Are smart meters compulsory?

Suppliers may encourage installation, but you can usually refuse. If you have one, still check bills and raise disputed reads promptly.

Where do I check for official help with bills?

Start with GOV.UK and MoneyHelper, then speak to your supplier. Be wary of cold callers claiming to be from Ofgem or the government.