When is the best time to switch energy suppliers?

Introduction

The energy market shifts constantly, making it hard to know exactly when to change your supplier. With Ofgem confirming an increase to the energy price cap from 1 October 2026, many households are asking if now is the right time to lock in a fixed tariff. Changing your energy supplier can protect you from upcoming price hikes, but it also means giving up the flexibility of a standard variable tariff.

Deciding whether to switch comes down to balancing price security against the risk of missing out if energy costs drop later in the year. This guide explains how the latest price cap changes affect your bills, the trade-offs of fixing your energy rates, and the practical steps to help you decide when to make a switch.

Understanding the current energy market

To decide if it is a good time to switch, you first need to know what you are currently paying and how that is about to change. Most households in Great Britain are on a standard variable tariff, which means their unit rates and standing charges are controlled by the Ofgem price cap. Ofgem reviews this cap every three months: in January, April, July, and October.

Until 30 September 2026, the price cap is set at £1,663 a year for a typical dual-fuel household paying by Direct Debit. However, Ofgem announced on 26 August 2026 that the cap will rise to £1,723 a year from 1 October to 31 December 2026. This is an annualised increase of £60, driven by elevated wholesale gas costs and geopolitical instability disrupting global supply routes.

It is important to remember that the price cap does not limit your total bill. It only caps the maximum amount a supplier can charge for each unit of gas and electricity you use, alongside the daily standing charge. If you live in a large, poorly insulated home, or use more energy than the typical household, your annual bill will be higher than £1,723.

Looking further ahead, energy analysts expect prices to rise again in the new year as winter demand peaks. Cornwall Insight forecasts that the January 2027 price cap will rise by around 9% to roughly £1,872. E.ON Next, one of the UK's largest suppliers, has published an even higher forecast of around £1,941. While these are only forecasts and the market remains volatile, the general expectation is that variable energy costs will be higher this winter than they are right now.

Should you choose a fixed or variable tariff?

The main choice you face when switching suppliers is whether to stay on a standard variable tariff or lock into a fixed deal. Each option has distinct trade-offs, and the right choice depends on how much you value price certainty.

A standard variable tariff offers flexibility. You are not tied into a contract, and there are no exit fees if you decide to leave. The downside is that your rates will go up and down every three months in line with the Ofgem price cap. If wholesale energy prices spike, your bills will increase at the next cap review. Right now, staying on a variable tariff means you will automatically face the October price increase.

A fixed tariff locks in its stated unit rates and standing charges for the agreed term. Ofgem said on 26 August that fixed tariffs were available at £100 or more below the October cap, but availability and annual estimates vary by region, payment method, usage and tariff conditions. Compare the actual offer rather than relying on an unattributed £1,550 example. The October cap is confirmed; figures for January 2027 remain forecasts.

The main risk of a fixed tariff is the exit fee. If wholesale energy prices unexpectedly crash next year, variable tariffs will become cheaper. To switch to a cheaper deal, you would have to pay an exit fee to leave your current fix. These fees vary significantly by supplier and contract length. For example, E.ON Next charges £50 per fuel to leave its 12-month Pledge Tracker, £100 per fuel to leave its standard 12-month fix, and up to £200 per fuel to leave its 24-month fixed tariff. Fuse Energy charges £100 per fuel to leave its 15-month fixed deal.

How the government VAT cut affects your bills

When comparing tariffs, include the temporary electricity VAT change in Great Britain. From 1 October 2026, VAT on domestic electricity in England, Scotland and Wales falls from 5% to 0%; gas remains subject to 5% VAT.

The Great Britain change runs until 31 March 2027. Ofgem says it is worth about £45 to a typical household and is already reflected in the confirmed £1,723 October cap. Northern Ireland has separate energy-market arrangements and is receiving comparable support through the Northern Ireland Executive.

The change covers Great Britain domestic electricity across payment methods and also benefits customers on fixed tariffs. It does not make a fixed tariff automatically cheaper than a variable tariff: compare the actual unit rates, standing charges, contract term and exit fees.

Practical steps for comparing energy tariffs

When you use a comparison site or check a supplier's website, the headline figure you see is usually a monthly or annual cost based on typical usage. However, this figure is just an estimate. To find out if a tariff is genuinely cheaper for your household, you need to look at the exact unit rates and standing charges.

To make an accurate comparison, you need to know what the default rates will be from October. For a household in Great Britain paying by Direct Debit, the confirmed Ofgem price cap rates from 1 October 2026 are as follows:

When evaluating a fixed tariff, compare its unit rates and standing charges against these October figures. If the fixed tariff offers lower rates, you will save money compared to staying on a variable tariff this winter. Keep in mind that rates can differ by payment method, so always compare the exact tariff available for your meter type and how you prefer to pay.

To get the most accurate quote, dig out your latest annual energy statement or log into your online account to find your actual yearly usage in kilowatt-hours (kWh). Entering your exact kWh usage into a comparison tool will give you a much clearer picture of your potential costs than relying on national averages.

What happens when you switch supplier?

Many people put off switching because they worry the process will be complicated or that their energy supply might be cut off. In reality, the switching process is entirely administrative. Your new supplier handles the transition, and the gas and electricity come through the exact same pipes and wires.

If things go wrong, you are protected by the Guaranteed Standards of Performance (GSOP). For example, if your final bill is delayed beyond six weeks, or if the switch does not happen within the required timeframe due to a supplier fault, you may be entitled to automatic compensation. Your supplier should pay this directly into your account.

Switching with a prepayment meter or debt

Having a prepayment meter or being in debt to your current supplier does not automatically prevent you from switching, but it does introduce some specific rules you need to be aware of.

If you pay by Direct Debit or on receipt of a bill and you have been in debt to your supplier for more than 28 days, your supplier can block the switch. In this scenario, you will usually need to pay the debt off before you can move to a new provider. If the debt is the supplier's fault—for example, if they estimated your bills incorrectly for months—you can challenge the block.

The rules are different if you have a prepayment meter. Under the Debt Assignment Protocol, you can switch to a new supplier as long as your debt is £500 or less per fuel. The debt simply transfers to your new supplier, and you continue paying it off at an agreed weekly rate through your meter top-ups. If your debt is over £500 per fuel, you will need to reduce it below this threshold before you can switch.

If you are struggling to clear your debt, contact your supplier. They are obligated to help you set up an affordable payment plan based on your income and outgoings.