Skip to main content

What is a prepayment meter?

As of 2023, 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.
Share this guide
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 smartcard, 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 up front. 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 smartcard, 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 more rare).

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.

Can I switch to a cheaper prepayment energy plan?

Yes. 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.

You can compare prepayment meter deals with Uswitch now, though it's unlikely you'll be able to switch given the ongoing volatility of the energy market.

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

Yes, with some caveats (see below). First, it's important to understand why you might want to change your meter.

Prepayment energy plans are some of the least competitive on the market — meaning if you stick with a prepayment meter you will have fewer plans to choose from if you want to switch and save money on your energy bills.

It is possible to switch your prepayment meter for a credit meter or smart meter, though it occasionally comes with a cost.

The good news is, if your current supplier is one of the big six, and you are eligible for a credit meter, you can get the 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 into 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 like to 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 will 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?

When it comes to prepayment meters, the disadvantages generally outweigh the advantages.


  • Helping customers to manage their debt and energy usage

  • Preventing large, unexpected bills


  • Above average costs for gas and electricity

  • 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, it's vital that you 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. smartcard 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 toped up.

Regardless of what type of prepayment meter you have, you should make sure you know how to top it up. The last thing you want is your electricity to go out or your gas supply to be cut off.

You may need to take your gas or electric meter key or card to a shop to top up. 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 meter

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 leaving 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.

Utrack advertising banner

Read more:

Changing from a prepayment meter to a credit meter - Uswitch

Looking to switch from a prepayment meter to a credit meter? We explain who can switch and how you can get your prepayment meter replaced with a standard meter.

Learn more
Debt consolidation loans

What to do if you're in debt to your energy supplier

Are you in energy debt? Find out what help is available if you owe money to your energy supplier and how to get out of energy debt.

Learn more

How to move your gas or electricity meter - Uswitch

You might not know how to move your gas or electricity meter, but if you're having building work, you might need to learn. This guide will help.

Learn more