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How to get the best energy deal

Find out how to choose the best gas and electricity tariff for you so you're not overpaying for your energy use.
Sarah Ingrams
Electricity bill_used 451912

Even though energy prices are high at the moment and cheap deals are hard to come by, it's still worth checking you're on the best energy deal for you. 

The more you know about the kind of energy tariff and features you’re looking for, the more likely you are to find an energy supplier and deal you’re happy with.

Although the price cap on out-of-contract tariffs rose by 54% for a typical user (based on Ofgem's calculation) on 1 April 2022, meaning the majority of us are facing much larger energy bills than we're used to, you can still take a look at what's available. 

Once you've read our tips to selecting the best tariff for you, use Which? Switch to compare gas and electricity prices.

Compare gas and electricity prices to find the best deal

Price comparison websites were the most popular way of looking for energy deals in 2020, with over half of switchers used them, according to our 2020 energy research. Going directly to an energy company was found to be the next most popular method.

When we asked people why they chose their provider, of those who selected their supplier themselves, the offer of a lower price compared to the previous supplier was the most common for switching.

Why people choose their energy firm

  • Offered a lower price than my previous supplier - 57%
  • Believed the firm would offer a better service - 31%
  • Greener or more environmentally friendly tariff - 20%
  • To have the same supplier for gas and electricity  - 19%
  • The energy company  is recommended by energy experts - 19%
  • It was recommended by friends/ family / co-worker - 15% 

Based on an online survey of 8,803 energy customers conducted in October 2021 - 5,273 of them actively chose their energy supplier.

Price comparison websites

Price comparison sites display a range of tariffs in price order so you can compare potential savings against your current deal.

But the moment, a couple of the biggest price comparison websites are suspended because there aren't enough tariffs they can earn commission on. Which? Switch is still running.

Price comparison websites don’t have to show every available tariff on the market, so if you don’t venture beyond a comparison site's initial recommendations, you might miss out on the cheapest tariffs.

When you use a price comparison website, remember that:

  • Some tariffs are exclusive to one price comparison website
  • Some tariffs are available only directly from the supplier
  • Some price comparison websites show a limited selection of tariffs upfront - for example only those they can switch you to directly, or just deals from the biggest companies. 

Check what the site says about which deals it displays automatically. You can often use the site's filters to see a wider range of deals than is initially displayed.  

Bear in mind that you will need to contact the supplier directly if you pick a deal the website cannot switch you to.

Our independent energy price comparison service, Which? Switch, automatically displays deals that it can’t switch you to directly – so you can use it to check if you can save compared with your current tariff even if it can't complete the switch for you.

Energy autoswitching services

Automatic switching services do more of the legwork for you than price comparison websites. They continuously compare and, with your permission, switch you to deals they calculate to be the best (based on information you provide) to keep you on a good rate.

One of the best-known, Flipper, closed in September 2021. It said it 'can no longer sustain the great savings that Flipper customers have come to expect' thanks to increased gas wholesale prices and companies removing low-cost tariffs.

Look After My Bills has also paused its service. Switchcraft and Switchd are still running. 

If you want a better energy deal with minimal effort, they could be worth a try. But be aware that few cheap deals are available at the moment and you may not get the very cheapest deal on the market. 

Before using an autoswitching service, check the following:

  • Its terms and conditions, so you know how they pick which tariffs to switch you to. 
  • The energy suppliers it works with. Some autoswitching services don't compare every deal available. If owned by a price comparison website, for example, they may only display deals from companies they have financial agreements with.
  • Its policies on switching you to companies with a poor reputation for customer service. Some autoswitching services won’t switch customers to suppliers they don’t feel are up to scratch. They may use external sources, customers’ feedback and their experiences of dealing with suppliers to determine this. This can help you avoid some poorly performing companies, but means you might save less than picking a deal yourself using a price comparison website. 
  • Whether it’s a free or paid-for service. For example Switchd charges between £1.99 and £4.99 per month, depending on the level of support you want. Sites that charge subscription fees typically cover the whole market, so may include cheaper deals than sites that are tied to specific suppliers, but you'll need to balance this off against how much the fees could eat into your savings. Switchd also offers a free version that only switches you to providers that pay it commission. 

Switching directly with an energy company

It might seem like the best way to get the inside track and the cheapest deals, but some big firms don’t sell their cheapest deals on their own websites. 

This can be because their cheapest tariff is an exclusive deal with a third party, for example a price comparison website or autoswitching service. To access it, you’ll need to go direct to that service.

At the moment, there are few cheap deals available, whether you use a price comparison website, or go directly to your supplier. Find out more about energy price rises and what you can do.

Refer-a-friend and other switching incentives

Some suppliers offer financial rewards for switching to them, including via refer-a-friend schemes that reward both the existing and new customer. 

If you’re invited to switch via one of these, ensure you check the following:

  • The price of the tariff you’ll be signing up to – is it the supplier’s cheapest deal?
  • How the price compares with other deals on the market once the incentive payment is factored in
  • Whether there are other conditions attached to the switching incentive – for example being a customer for a certain period, or getting a smart meter – and whether you're happy with these
  • If the supplier charges exit fees if you want to leave
  • How good the supplier’s customer service is. Check the best and worst energy companies for 2022.

How often should I switch energy tariff?

If you let a fixed tariff run out, you'll end up on a standard variable tariff. Until recently these could cost you hundreds of pounds extra per year. Now they are among the cheapest tariffs available.

Usually we'd advise that you switch once a year, timing your switch to coincide with your fixed contract ending.  

You don't need to worry about switching more than this unless a particularly enticing deal comes along - or cheaper deals start reappearing.

We found that, over a two year period from September 2018 to 2020, switching twice or even four times a year wouldn't have saved a medium energy user more than switching just once a year. Some suppliers charge exit fees for switching mid-contract, which would eat into your savings, and it's more hassle. 

There may be exceptions to this rule if energy prices drop dramatically a few months after you've switched. Use Which? Switch to compare gas and electricity prices.

Fixed and variable energy tariffs: which is best for me?

Energy deals come in two basic types: fixed or variable. Which one would suit you better will depend on how much certainty you want over the price you pay, and how often you want to switch.

Variable tariffs

Often also called 'standard' tariffs, they change price each time your supplier changes its rates. 

Your supplier’s default (or out-of-contract) tariff will usually be variable. So if you have been with your supplier for a while, or didn’t switch after your fixed deal ended, it's very likely that you're on its standard variable tariff or default tariff.

Default tariffs are subject to a price cap. This is effectively a cap on the price charged for each unit of energy – not a cap on your total bill. The cap is reset by energy regulator Ofgem every six months and increased in April 2022 to its highest-ever rate of £1,971 per year for a typical user (based on Ofgem's calculations).

You can leave a variable tariff whenever you like. You're not tied-in with a contract or exit fees.

Fixed tariffs

These set the rate you pay for each unit of energy you use for a certain period of time (one or two years, for example).

This means that you know the price you pay for energy won’t rise during the period of your contract. If your energy company raises its prices, you won’t be affected – but you won’t benefit if its prices drop, either.

Fixed and variable tariffs: which is cheaper?

The very cheapest deals on the market tend to be a mixture of fixed and variable so it’s not as simple as picking one type to guarantee you get the cheapest rates.

However at the moment very few cheap energy deals are available of either type. In some cases, supplier's cheapest deals are their price-capped variable tariffs.

Previously suppliers have offered a range of cheap one-year fixed deals, competing to tempt customers to join them on these tariffs. This is why they were attractively priced.

There were cheap variable deals too - though the risk is that companies can (and do) change their variable tariff prices when the price of wholesale energy rises.

The price cap on out-of-contract of default variable tariffs doesn't mean that suppliers have to charge this amount. But many do.

Economy 7, Economy 10 and time of use tariffs

Economy 7 and Economy 10 are the two most common time-of-use tariffs. If you're on one of these, you’ll probably have a special electricity meter that provides two different readings (also known as a two-rate meter). 

This will change, though – as smart meters become more widespread, special meters won't be necessary. This will enable all homes with smart meters to access time-of-use tariffs. A few firms are offering these already. Find out more about smart meters.

Time-of-use tariffs charge different rates for electricity used at different times of day. For example, a more expensive rate for electricity used at times of peak demand in the daytime, and a cheaper overnight rate.

  • Economy 7 gives seven hours of cheaper electricity. 
  • Economy 10 gives 10 hours.

To make the most of these tariffs, you need to use a certain proportion of electricity during the cheaper hours. You might do this by:

  • Heating your home with electric storage heaters
  • Heating your water during cheap hours
  • Running some appliances overnight (though for safety reasons, you shouldn't leave your washing machine, dishwasher or tumble dryer running when you're asleep).

Use less than 30% on the cheaper rate and you might be better off on a single-rate electricity tariff.

If you have a time-of-use tariff and don’t think it’s the best deal for you, all energy companies with more than 50,000 customers must make their single-rate tariffs available to customers with restricted meters. This includes Economy 10 meters and white meters. 

If you think you’d be better off on a single-rate tariff, and your meter needs changing to make this possible, your supplier cannot charge you to install a new meter. For a faster fix, some suppliers are willing to add the peak and off-peak readings together and charge you a single rate.

Smart meter tariffs

Some companies offer deals that use smart meter readings taken every half hour to offer tariffs tailored to different lifestyles or when electricity is cheapest for the supplier to buy.

Smart meters track the amount of gas and electricity you use, send this to your energy company automatically and show you how much it’s costing you. Find out more about smart meters and how they work.

You might not need to have a smart meter already installed in order to sign up to one of these deals, but it will be a condition of the tariff that you’ll need to get one installed.

Renewable energy tariffs

There has been an explosion in the number of ‘green’ energy deals, since rules were removed limiting the number of deals energy companies could sell at once.

Prices vary and there is no set definition of what a ‘renewable’ tariff must include. 

Some companies play a part in funding or generating renewable electricity or ‘green’ biogas, others buy the equivalent of what their customers use in renewable electricity, and others match their customers' use with renewable power that they haven't bought. 

Companies also offer different proportions of renewable electricity, and some offer other social or environmental perks. See the differences between green energy suppliers.

If you’re keen to support renewable electricity, check your potential supplier’s arrangement.

Default renewable tariffs from Good Energy are not subject to the government's price cap owing to the support they give to renewables. This means you'll likely pay more for them.

Find out more in our guides to renewable energy and green gas.

Should I bundle gas and electricity with broadband or boiler cover?

You can buy multiple services from some energy firms, including broadband, mobile phone packages, boiler cover and smart home devices. The following firms sell multiple products and services:

If you’re tempted to buy more than gas and electricity from your energy company, check whether it would be cheaper to buy the equivalent from separate firms. 

Find out whether boiler cover is worth it for you.

How to avoid exit fees

Before you switch energy supplier, check the terms and conditions of your deal. 

If you want to leave a fixed-term tariff before the end of your contract, you may have to pay an exit fee. But don’t let this put you off. 

  • Not all fixed deals have exit fees. Choose one of these and, if prices go up, you are protected – but if they go down, you can switch at any time at no cost.
  • Your supplier can't charge an exit fee if you switch in the last 49 days of your fixed tariff.
  • You should not have to pay exit fees if you’re moving home, provided you keep your tariff but just change the address. 
  • If you switch tariff but stay with the same provider, some may waive the exit fee – it's worth asking.
  • Exit fees are usually between £5 and £50 per fuel, so it’s worth working out whether you'd still be better off switching and paying the exit fees.

Change how you pay energy bills to save money

You can sometimes get a discount if you pay by monthly direct debit. The amount you pay each month will be worked out by your gas or electricity supplier. It's based on the amount of energy you use, or are likely to use, in each year, divided by 12. 

It often costs slightly more to pay when you receive your bill. If you pay as you go for energy, there’s another price cap in place, limiting how much suppliers can charge. Find out more, and whether a prepayment energy meter is right for you.

If you’re happy to view your bills online, opt for paperless billing. Requesting paper bills will often add to the cost of your tariff.

The best way to save money on your bills is to use less energy. Read our 10 ways to reduce energy bills and find out how to make your home more energy efficient

How to stop your energy company overcharging

Whether or not you've just switched, there are several things you can do to keep your bills accurate.

Send your supplier regular meter readings to make sure you're being charged only for the energy you're actually using. Without these, your energy firm will estimate your usage. If you have a smart meter, it should send these automatically and you can choose between monthly, daily and half-hourly readings.

If you’re billed or pay monthly, and don't have a smart meter, it’s a good idea to send monthly meter readings. Some energy firms will send you reminders to do so, and you can often submit them online.

Know how to read your gas meter and how to read your electricity meter.

Besides sending regular meter readings, follow these steps to keep your energy bills in check:

  • If you think you may be eligible for extra help with your energy bills, check if you can get the Warm Home Discount, Cold Weather Payment or Winter Fuel payment, or a free boiler or insulation.
  • If your energy company increases prices, read your meter and submit the reading on the day the rise takes effect. This way, you get the lower price for the maximum period.
  • Question direct debit changes if you don't agree with them. Contact your energy company and ask it to explain how and why it has calculated the change.
  • If your direct debit payments are increasing, your supplier must give you at least 10 working days' notice before the new amount is debited – either by a separate letter or email, or as a note on your bill. If it doesn’t, complain and ask for compensation. You can also make a claim under the Direct Debit Guarantee.
  • If you are disproportionately in credit, ask for a refund. But remember that it's normal to be in credit in the summer if you pay by fixed direct debit.
  • Know the end date for your fixed tariff and switch to a new deal before it expires. This way you’ll avoid being moved automatically on to your supplier’s default tariff, which is unlikely to be its cheapest.
  • Use our letter template to complain to your energy supplier about being overcharged.

For more information, see: my energy supplier has raised prices, do I have to pay?