Do Energy Comparison Sites Actually Save You Money

Energy comparison sites can save you money, but how much depends on the tariff you are currently on, how much energy you use and whether you act on what the site shows you. If you sit on a standard variable tariff at the Ofgem price cap, a good fixed deal found through comparison can cut your annual bill. If you are already on a competitive fix, the saving may be small or nil.

This guide explains what comparison sites can realistically do for a UK household in 2026, how their savings claims work, the commission and whole-of-market questions worth knowing about, and how to sense-check any deal against the current price cap.

• Yes, comparison sites can save money, mainly by moving you off a price-capped variable tariff onto a cheaper fixed deal.
• Typical advertised savings against the July 2026 cap sit in the region of £200 a year for a dual-fuel household, though your figure depends on your usage.
• Savings are not guaranteed for everyone. If you are already on a sharp fix, switching may save little.
• The site is free to use; suppliers usually pay a commission, so it pays to check more than one tool and the supplier’s own site.

Do energy comparison sites actually save you money?

Energy comparison sites save most households money when they move you from a price-capped standard variable tariff onto a cheaper fixed deal. The size of the saving depends on your usage, your current tariff and the deals live that day. Comparison is the mechanism that surfaces a cheaper price, but the saving only lands once you switch and stick with it.

The benchmark every saving is measured against is Ofgem’s energy price cap. Ofgem announced on 27 May 2026 that the cap would rise by 13% for the period 1 July to 30 September 2026, taking the typical dual-fuel direct debit household to around £1,862 a year. This figure is time-dependent and should be checked against Ofgem’s latest announcement.

One point worth keeping front of mind: the price cap limits unit rates and the daily standing charge for a typical user. It is not a cap on your total bill. The more gas and electricity you use, the more you still pay, so two households on the same tariff can see very different bills.

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How much can switching actually save?

Switching from the price cap to a leading fixed tariff can save a typical dual-fuel household in the region of £200 a year, based on advertised savings circulating in June 2026. As an example, a 12-month fixed dual-fuel deal priced at around £1,632 a year at typical consumption sits roughly £218 to £230 below the July 2026 cap of about £1,862. These figures move daily and depend on your usage.

Supplier-led savings can be more modest. In its 27 May 2026 statement, one large supplier said its fixed-tariff customers would save around £82 a year compared with the July cap, while keeping its own variable tariff a few pounds below the cap. The lesson is that not every fix is a big winner against the cap, so the headline number you see matters less than how it compares with your own current deal.

To translate a comparison into a real saving for your home, you need your annual kWh usage, not just the typical-user figure. The typical figures Ofgem and suppliers quote assume average consumption. A low-usage flat and a high-usage family house will both see different cash savings from the same tariff.

Indicative figures only; actual prices change daily and vary by region, payment method and usage. Always check the live quote for your address.

Are comparison sites biased by commission?

Most energy comparison sites earn a commission from the supplier when you switch through them, and Citizens Advice has warned this can shape what you see. Its research has found that some sites limit the choice on offer or push people towards deals that earn the company the best commission, rather than always the cheapest available across the whole market.

This does not mean comparison sites are not worth using. It means the result you see on one site is not automatically the best deal in the market. The practical response is to treat a comparison as a strong starting point, then cross-check, rather than as the final word.

Free Price Compare is FCA-authorised and compares across the whole of the market we cover. As a general rule, looking at more than one source and the supplier’s own website gives you a fuller picture of what is available.

Do comparison sites show the whole market?

Not every comparison site shows every tariff on the market, which is why your result can vary between tools. A site may show only deals you can switch to through that site, or only suppliers it has a commercial arrangement with. That is a key reason two sites can quote you different “cheapest” tariffs on the same day.

Ofgem runs a voluntary accreditation scheme called the Confidence Code for energy price comparison sites. The whole-of-market requirement that once obliged accredited sites to show a wide range of tariffs was partially removed and then dropped as part of a 2018 Confidence Code review, so accreditation alone no longer guarantees you are seeing every available deal.

Citizens Advice runs its own free, impartial comparison tool that it says must show every tariff on the market and earns no commission. For a household that wants reassurance it has seen the full picture, that tool is a useful cross-check alongside a commercial comparison.

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See how the best energy comparison sites stack up

Compare accreditation, market coverage and features before you switch

Read our comparison guide

Should I cross-check more than one site?

Yes, checking more than one comparison site is sensible because not all of them show the same tariffs and suppliers. Running your details through two or three tools, plus the supplier’s own website, helps confirm whether the cheapest deal you have found really is competitive or just the cheapest one that particular site can switch you to.

A practical routine looks like this:

• Have a recent bill to hand so you can enter accurate annual kWh usage, not just the typical-user estimate.
• Run the comparison on more than one site and note the cheapest dual-fuel result on each.
• Check the leading suppliers’ own websites, as some exclusive fixes are not always shown elsewhere.
• Compare the best price you find against the current Ofgem price cap before deciding.

For more on building this into a wider household routine, see our guide on switching and comparison strategies to cut household bills.

Is it better to go direct to the supplier?

Going direct can sometimes get you a deal that a comparison site does not show, but it rarely beats checking both. Some suppliers offer exclusive or member-only fixes on their own websites, and a few attach a price promise that automatically lowers a fixed deal if the cap falls. Comparison sites will not always surface those.

The most reliable approach is to compare first, then check the supplier direct, then pick the cheapest option for your usage. Going direct alone risks missing a cheaper rival; comparing alone risks missing a supplier’s exclusive. Doing both takes a little longer but tends to find the best price.

Does fixing actually save money in 2026?

Fixing your energy tariff in 2026 can save money, but it is no longer a guaranteed win the way it once was. Before the energy crisis, fixed deals were usually cheaper than standard variable tariffs. Since then, the gap between fixed and variable has narrowed, and the best option changes with market conditions.

The July 2026 cap rise of 13% was driven largely by higher wholesale gas prices, and the increase fell unevenly: gas unit rates rose far more steeply than electricity. In that environment, a fixed deal priced below the cap offers certainty and protection against further rises, but locks you out of any future falls.

The practical rule of thumb is to compare any fixed tariff against the current Ofgem price cap. If a fix is priced competitively below the cap, has no punishing exit fees and the certainty suits you, it is worth considering. If you expect prices to fall sharply, a variable or wholesale-linked tariff might work out cheaper, though it carries more risk.

Watch exit fees before you commit, as they can erode a saving if you switch again. Some fixed deals carry no exit fees at all, while others charge anywhere from around £75 to £150, sometimes per fuel. If you think you may want to move again within the year, a zero-exit-fee fix protects your flexibility.

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Are energy comparison sites free to use?

Yes, energy comparison sites are free for households to use. You do not pay a fee to run a comparison or to switch through one. The site is typically paid a commission by the supplier when you complete a switch, which is how the service stays free at the point of use.

Because the supplier funds it, the commission model is also why coverage and the deals shown can vary between sites, as covered earlier in this guide. The cost to you is your time and attention, not money, so there is little downside to comparing regularly, even just to confirm you are still on a competitive rate.

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Who saves the most from comparing energy?

The households that save the most from comparing energy are those sitting on a standard variable tariff at the price cap who have not switched in a while. Moving off the cap onto a competitive fix is where the largest cash savings usually come from. High-usage homes also tend to see bigger pound savings, because the same unit-rate reduction applies to more kWh.

Those who save least are households already on a sharp recent fix, or low-usage homes where a small per-unit saving translates to modest cash. Prepayment customers sit under a separate cap and have fewer fixed deals to choose from. You can read more in our guide to the energy price cap and prepayment meters.

If lowering your bills matters as much as switching, pairing a comparison with practical usage changes helps. Our tips for saving money on electricity bills work alongside finding a cheaper tariff.

• How to Challenge UK Utility Bill Increases & Save Money
• Switching & Comparison Strategies – Cut Household Bills
• Energy Price Cap and Prepayment Meters: Impact in 2025
• Best Energy Comparison Sites UK 2025 | Compare & Save
• Green Dual Fuel Tariffs UK | Save Money and Cut Carbon