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What is a prepayment meter?

As of 2024, around four million people in the UK have a prepayment energy meter, according to Ofgem. Learn how they work and how to switch from a prepayment meter to a regular meter.
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What is a prepayment meter?

Prepayment meters are a type of domestic energy meter that requires users to pay for energy before using it. This 'pay-as-you-go' energy is used with a smart card, token or key that can be topped up at a shop or via a smartphone app.

How do prepayment meters work?

With a prepayment meter, you have to pay for your gas and electricity upfront. Prepayment meters use pay-as-you-go energy just like some mobile phones - you have to top up with credit to get your gas and electricity.

The top-ups work in a variety of different ways. You could have a smart card, token or key you have to take to a shop. This is why you might hear a prepayment meter referred to as an electric key meter or gas key meter. You can top up electricity or gas meters at recognised PayPoint or Payzone shops, or at the Post Office.

Some older prepayment meters are coin-operated, meaning you put money straight into the meter itself (this is becoming rarer).

Many suppliers now offer prepayment top-up by text, app, phone or online. This can be more convenient as there's no need to leave the house to top up your electricity or gas, and it means you can add more pay-as-you-go energy at any time day or night.

Does energy cost more on a prepayment meter than on a credit meter?

This was previously the case, but it led to accusations of a "prepayment premium". As part of the February 2024 price cap announcement, the government is applying a discount on prepayment standing charges, which means that prepayment bills overall will be slightly cheaper than standard credit bills.

Are prepayment meters capped?

Prepayment tariffs are subject to the price cap in the same way standard variable credit tariffs are. The prepayment price cap level is £1,643 from 1 April to 30 June 2024 but will drop to £1,522 from 1 July to 30 September. However, as with the credit price cap, this is only an indication for average use households - if you use more, you'll pay more, and if you use less, you'll pay less.

Can I switch to a cheaper prepayment energy plan?

It depends. Nearly every supplier has at least one prepayment tariff available and, just like regular meters, some plans are cheaper than others. It's worth checking to see if you could switch prepayment meter plans to save.

Can I switch from a prepayment meter to a standard meter?

Yes, with some caveats. It is possible to switch your prepayment meter for a credit meter or smart meter, though it occasionally comes with a cost. Depending on who your supplier is, you could get your meter switched for free.

Before switching your meter, your supplier will likely require that certain conditions are met. These include that your account is debt-free and, in some cases, that the account holder passes a credit check.

If you are a renter, please note that you will need the landlord's permission to change the meter.

If your current supplier charges to change from a prepayment to a credit meter, you're not stuck - you can still switch to a cheaper prepayment plan from another supplier. Your new supplier may even be able to swap your meter out at no cost.

Why does my home have a prepayment meter?

Prepayment energy meters are usually installed in homes that have slipped into debt with their energy supplier at some point, to help them manage their debt and therefore budget more effectively.

Some landlords also have them installed in their rental properties to try and cut the risk of their tenants running into debt.

If you have to switch to a prepayment meter because you're in debt to your energy supplier, you will pay off your debt bit by bit at the same time as you pay for the gas and electricity you use.

This means that as well as paying the unit rate for the energy you use, you'll pay a little extra to go towards what you owe.

How to take a prepayment meter reading

To get a meter reading from your prepayment meter, you'll usually have to press a button on the meter (sometimes it's blue).

This will change the display from showing the remaining credit to showing the actual reading. From there on, it's just like taking a normal meter reading.

What are the pros and cons of prepayment meters?

While prepayment meters were more expensive to have than credit meters, it was clear that they were the worst of the two options. However, with the "prepayment premium" being resolved, it's a less clear choice for customers.


  • As of April 2024, those on prepayment meters will pay slightly less for their energy than those on credit meters

  • They help customers manage their debt and energy usage

  • They prevent large, unexpected bills


  • The best energy deals on the market aren't available to prepayment meter customers

  • They can be inconvenient because you have to go out to top up electricity or gas keys and smartcards (if your supplier doesn't offer app top-ups)

  • If you can't reach a shop to get an electricity or gas top-up, your energy can be switched off temporarily

  • Older meters need to have their prices updated manually after price rises or drops, which can take months. This means you could be left paying old rates and owing a lump sum or paying too much

I've just moved to a house with a prepayment meter - what should I do?

If you've moved to a new home that has a prepayment meter, you must register with the energy company as the new account holder. If you don't, you could end up paying the wrong rates because the previous occupier could be in debt to the energy supplier.

Once you've registered as the new account holder, it's a good idea to compare energy prices to make sure you're on the cheapest prepayment meter tariff for you.

Different types of prepayment meters

There are three main types of prepayment meters: key meters, smart card meters and smart prepayment meters. The first two work in a very similar way, and smart prepayment meters work slightly differently.

Gas or electric key meters vs. smart card meters

A gas or electric key meter uses a special electronic key with your tariff information on it. A smart card meanwhile sends your latest information through to your supplier when topped up.

Regardless of what type of prepayment meter you have, you should make sure you know how to top it up. You may need to take your gas or electric meter key or card to a shop to put money on it. Make a list of the nearest shops and Post Office locations as well as their opening times. You should also look out for holiday periods and top your key or card up with a bit extra before bank holidays and other holiday periods when topping up could be difficult. Most prepayment meters have an emergency credit budget you can use, like an overdraft, but it is limited.

If you lose your prepayment meter key or smart card, don't worry. You can simply contact your supplier to get a new one sent out, but in the meantime your supplier should be able to authorise a temporary card from your nearest PayPoint, PayZone or Post Office. If this isn't possible, you might require an emergency callout which will involve a charge. When you move into a property with a prepayment meter you should contact your supplier and clarify exactly what happens if you can't find your card or token.

Smart prepayment meters

Smart prepayment meters, or smart pay-as-you-go meters as they are also known, are the latest generation of gas and electricity meters.

Smart prepayment meters have all the same functionality as standard smart meters, allowing you to view your usage information at any time using the in-home display. This can help you to manage your gas and electricity usage and find ways to cut down and save on your bills.

These modern prepayment meters are also more likely to have smart features to make electricity and gas top-ups easier. You can usually complete a smart meter top-up online or via an app to save you from having to leave the house. Once you top up electric or gas on your smart meter the credit will be added remotely, so you don't need to do anything with your meter.

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