Prepayment Electricity Meters: How They Work and Help

How does a prepayment electricity meter work?

A prepayment electricity meter, also called a prepaid or pay-as-you-go meter, holds a credit balance. The meter deducts the cost of each kilowatt hour (kWh) you use. It also collects the tariff’s daily standing charge and may collect an agreed amount towards electricity debt. This is different from paying a monthly Direct Debit, where the supplier normally spreads expected costs across the year.

A smart prepayment meter may let you top up through an app, website or telephone service. A traditional meter normally uses a key or card loaded at an accepted outlet. Northern Ireland commonly uses keypad meters, where a purchased code is entered at the meter. Keep each receipt until the credit appears.

What does a top-up actually pay for?

A top-up is not the same as buying that amount of new electricity. Before the remaining balance can fund future use, the meter may take an agreed debt repayment, recover emergency or friendly-hours credit already used, and collect standing charges that became due while the balance was low. The sequence and timing depend on the meter and supplier.

For example, suppose you add £20. If £4 goes to an agreed debt repayment and £3 repays temporary credit, £13 remains. If the illustrative tariff includes a 50p daily standing charge and electricity at 25p per kWh, one day’s standing charge leaves £12.50: enough for 50 kWh at that unit rate. This is a budgeting example, not a typical-use estimate; use the deductions and rates shown on your own meter and tariff.

Standing charges apply every day the property remains supplied, even with no use. A balance can reduce while a home is empty, or the meter may recover missed charges after the next top-up.

• Write down the balance immediately before and after topping up.
• Check the current unit rate and daily standing charge against the tariff information.
• Look for debt, emergency-credit and missed-charge deductions.
• Contact the supplier if a deduction is unclear or leaves too little for essential use.

Emergency credit, friendly hours and extra support

Emergency credit is a limited reserve you can activate when ordinary credit is low or exhausted. Friendly-hours credit can keep the supply available during specified nights, weekends or public holidays when topping up may be difficult. The amount, activation steps and protected hours vary by supplier and meter, so learn them before the balance is close to zero.

In Great Britain, Ofgem says suppliers must offer help when a customer cannot afford the energy they need. A supplier can consider additional support credit for someone in a vulnerable situation who has disconnected or is at risk of doing so. Ofgem’s guidance says requests should be assessed case by case and repayment should reflect ability to pay; it is short-term protection, not a lasting answer to unaffordable bills.

What to do if you cannot top up

Contact the electricity supplier as soon as you know the balance may run out. Say whether the problem is lack of money, a lost or rejected key or card, a failed online top-up, an inaccessible meter, or a shop being closed. Explain any disability, health condition, young children, critical medical equipment or other circumstance that makes loss of electricity particularly risky.

Ask how to activate emergency credit, whether friendly-hours credit applies and whether additional support credit or a fuel voucher may be available. Confirm how much must be repaid and at what rate. If debt deductions are leaving too little usable credit, ask for the repayment rate to be reviewed. Citizens Advice says a Great Britain supplier must take account of what you can afford.

Treat a failed top-up as urgent when essential equipment, heating or medicine depends on electricity. Do not open, bypass or move the meter yourself.

• Check whether the payment completed and whether a code must be entered manually.
• Use the supplier’s official contact details, not a link in an unexpected message.
• Tell the supplier if you have no supply or cannot access temporary credit.
• Ask for accessible communication or Priority Services Register support where relevant.

When prepayment may not be suitable

Prepayment can help some households see spending as it happens and avoid a later bill, but it is not suitable for everyone. In Great Britain, a supplier must consider whether prepayment is safe and reasonably practicable for the household. Relevant problems can include being unable to reach or operate the meter, difficulty getting to a top-up outlet, digital or communication barriers, and a serious risk if the supply stops.

Tell the supplier immediately if circumstances have changed or the arrangement is unsafe. Ask what adjustment, meter move, smart top-up option or alternative payment method it can provide. Ofgem says that if an inaccessible meter cannot be moved, the supplier must replace it with a different type of meter. Never reduce essential medical use or safe heating simply to preserve credit.

A Great Britain supplier proposing prepayment for debt must assess the household rather than treat installation or a remote switch as automatic. Provide relevant information, ask for the decision in writing and complain if safeguards were not followed.

How to compare prepayment with other payment methods

Compare the full annual cost, not just the convenience of topping up. Find the unit rate, daily standing charge and any fixed tariff terms for each option, then apply the same annual kWh use. Include only unavoidable fees and guaranteed discounts. A quoted monthly Direct Debit is a payment schedule, not proof of the tariff’s annual cost.

Also consider access to top-ups, the risk of losing supply and debt collection. A change of payment method does not erase debt, so ask how balances transfer and check the new rates and repayments.

Prepayment electricity in Northern Ireland

Northern Ireland has a separate market and regulator, so Ofgem’s rules do not apply. Prepayment is commonly called Keypad or pay as you go. Suppliers must explain charges, topping up, emergency credit, faults, refunds and alternative payment methods.

The Utility Regulator says prepayment is not suitable if someone in the home uses life-support or critical-care medical equipment. If you cannot physically use the meter or reach top-up facilities, ask the supplier for an alternative arrangement. For debt recovery, the supplier must explain the terms and the share of each top-up taken; the regulator states this can be no more than 40%.

Contact the supplier first. The Consumer Council for Northern Ireland can help with an unresolved complaint.