The four ways to top up, ranked by speed
A smart prepayment meter lets you top up remotely (app, online or phone) and the credit travels over the smart network. A traditional prepayment meter has no connection, so you top up in store and physically carry the credit home on a key or card. Pick your method below; the picker shows how fast it lands.
What is the fastest way to top up your meter?
Tell us your meter type. We show the methods open to you and how fast each one reaches the meter.
Your top-up options
Smart top-ups typically arrive within 45 minutes (often minutes); in-store key/card top-ups are instant on insertion. Verified June 2026.
Topping up by supplier: the steps are nearly identical
People search "British Gas smart meter top up", "OVO smart meter top up", "Octopus top up" as if each were different. They are not. For a smart prepayment meter, every major supplier works the same way: pay on the app or website, and the credit is pushed to the meter over the smart network within about 45 minutes. For a traditional meter, you top up in store with the key or card. The only real differences are the name of the app and which shops carry the supplier's top-up network (most use PayPoint or the Post Office).
| Method | Where | How fast | Best for |
|---|---|---|---|
| Supplier app | Your supplier's mobile app | Up to ~45 min | The default for a smart prepayment meter. Top up from the sofa; credit is sent over the smart network. |
| Online account | Supplier website / My Account | Up to ~45 min | Same as the app, on a laptop. Useful if you do not have the app installed. |
| In store (card or key) | PayPoint, Payzone or Post Office | Instant on insert | Traditional (non-smart) prepayment, or a backup. You carry a key (gas) or card (electricity) and insert it into the meter. |
| Phone / automated line | Supplier payment line | Up to ~45 min | When the app is down or you have no smartphone. Have your account and card details ready. |
The belief that costs prepayment customers money
Most people assume a £20 top-up buys £20 of energy. On prepayment, it rarely does, and not because anyone is cheating you. Two deductions come off the top before energy is credited: the daily standing charge you owe for each day since your last top-up, and any debt recovery (repaying emergency credit or an agreed arrears plan). Together they can take a noticeable slice of every top-up.
This is why understanding where the money goes matters more than knowing which button to press. The mechanics of topping up are easy; the mechanics of the deductions are what decide how warm your home actually gets.
The insider view: the standing charge never stops
Here is the part the supplier apps never spell out. The standing charge is charged per day, whether or not you use any energy and whether or not there is credit on the meter. If you go away for a fortnight, or self-disconnect because you cannot afford to top up, the standing charge keeps stacking up as debt. The day you next top up, those accumulated daily charges come off first.
The self-disconnection trap A household that lets the meter run to zero is not pausing the bill, it is borrowing. Every day off-supply adds another standing charge to the pile, so the next top-up has to clear that backlog before any energy flows. This is how a £10 top-up can deliver almost nothing: it is paying off days of standing charge first. If you are heading toward zero and cannot top up, activate emergency credit and use friendly credit over weekends, and tell your supplier, they cannot refuse a struggling prepayment customer support.
The practical takeaway: top up little and often is fine for convenience, but a single larger top-up wastes less, because the standing-charge backlog is cleared once rather than being a bigger share of several tiny payments. And if topping up is a genuine struggle, prepayment may be the wrong payment method for you at all.
What to actually do
Use the app for speed
For a smart prepayment meter, the app or website is fastest and free. Keep a card or key as a backup for when the signal drops.
Know your two deductions
Ask your supplier your exact daily standing charge and debt-recovery rate, so you know how much of each top-up becomes energy.
Never just hit zero
Activate emergency credit before you run out, and lean on friendly credit overnight and at weekends. Self-disconnecting only grows the debt.
Check if credit suits you better
A smart meter can often switch to monthly Direct Debit remotely, unlocking cheaper tariffs and ending the top-up chore.
The bottom line
Topping up a smart meter is simple: app or online for a smart prepayment meter (credit in about 45 minutes), in store with a key or card for a traditional one. The hard part is not the method, it is the standing charge and debt that come off every top-up before you get any energy. Top up in fewer, larger payments, never let the meter hit zero, and if topping up is a constant struggle, look at switching to monthly Direct Debit, which a smart meter can usually do without an engineer visit.
Smart meter top-up FAQ
The Selectra expert answers your questions
If your smart meter is set to prepayment mode, the easiest way is your supplier's app or website: pay by card and the credit is sent to the meter over the smart network, usually within about 45 minutes. You can also top up by phone, or in store at a PayPoint, Payzone or Post Office. A traditional (non-smart) prepayment meter is topped up only in store, by loading a key (gas) or card (electricity) and inserting it into the meter.
App, online and phone top-ups usually appear within about 45 minutes, though most arrive in a few minutes. In-store key or card top-ups are instant once you insert the key or card into the meter. If credit has not shown after an hour, try a manual sync (hold the meter button as your supplier directs), check your home network signal, and contact your supplier if it still has not arrived.
The method is much the same for every big supplier (British Gas, OVO, E.ON Next, Scottish Power, Octopus): top up on the supplier app or website for a smart prepayment meter, or in store with your card or key for a traditional one. The "British Gas smart meter top up" you are searching for is the supplier's own app/website payment, the steps are the same whoever supplies you. Have your account or meter number to hand the first time.
Two reasons. First, the daily standing charge is taken from your credit every day, even if you use no energy, so a meter sitting idle still drains. Second, if you owe money (from emergency credit or a debt repayment plan), a set amount, often around 10 to 25%, is taken off each top-up before any energy is credited. So a £20 top-up can deliver well under £20 of usable energy. Ask your supplier exactly what your daily standing charge and debt-recovery rate are.
Emergency credit is a small reserve (typically £5 to £15) you activate on the app, meter or in-home display when your balance is about to run out. It is borrowed, not free: the full amount is taken off your next top-up before any new energy is credited. Most suppliers also offer friendly credit, which keeps you on supply overnight, at weekends and on bank holidays so you are never cut off when you cannot top up.
Often, yes. Prepayment is no longer always the most expensive way to pay, but a smart meter can usually be switched to credit (pay monthly by Direct Debit) remotely, which opens up cheaper tariffs and removes the top-up hassle. If you are in debt the supplier may ask you to clear it first. See switching from prepayment to Direct Debit, and if money is tight, the support on our energy support guide.