Quarterly Energy Price-Cap Changes: What to Check

At a glance

  • The current price-cap periods start on 1 January, 1 April, 1 July and 1 October.
  • Ofgem announces a new level before it takes effect; the announcement does not immediately change your bill.
  • Check your tariff, new unit rates and standing charges, and readings around the change.
  • A quarterly cap change does not automatically reprice a fixed tariff or protect a business contract.

Quarterly price-cap news is useful if you connect it to your own tariff and consumption. This guide explains what to check around a change. It concerns Ofgem’s domestic cap in Great Britain, not Northern Ireland’s separate arrangements.

On this page

The four periods

The current quarterly timetable is:

  • 1 January to 31 March.
  • 1 April to 30 June.
  • 1 July to 30 September.
  • 1 October to 31 December.

The latest Ofgem cap update gives the effective period and upcoming announcement dates. Use the regulator’s current timetable if arrangements change.

These dates are useful reminders to review an account. They are not a guarantee that every tariff changes on all four dates, or that prices always go up.

Announcement date versus effective date

A change can be announced several weeks before the new rates begin. During that interval, your existing rates still apply unless your tariff has another applicable change.

Read the supplier’s notice for the actual effective date and prices. A news report about the next cap level is not a substitute for checking the tariff on your own account.

Keep the old and new rates together. Note whether they include VAT and which fuel, region and payment method they cover. Ofgem publishes current regional rate information.

Check whether the change applies to you

Start with your tariff name and terms. An eligible standard variable or default tariff may be affected by the new cap period. A fixed agreement does not normally change just because a new quarterly level is announced.

If your fix ends near the same date, there can be two separate events: the fixed agreement ends and a new default-tariff period begins. Check the supplier’s explanation of what happens next rather than assuming that both follow the same rule.

The domestic cap does not cover ordinary business contracts. Northern Ireland has a different regulatory system. Read our explanation of who the cap covers if you are unsure of the distinction.

Take a reading where needed

If your supplier is not receiving automatic readings, submit an actual reading close to a price-change date and keep its date and confirmation. It can help the supplier divide consumption between the two price periods.

For a working smart meter, check that the account is using actual smart readings. You do not need to assume an in-home display proves the supplier has received the correct data. Follow supplier instructions if a manual reading is requested.

Do not put yourself at risk trying to reach a meter or press buttons at an exact moment. Ask the supplier for help if access or the meter display is difficult. Citizens Advice provides meter-reading guidance.

How a split-period bill works

Suppose a bill includes consumption before and after a rate change. With illustrative prices on the same tax basis:

  • 100 kWh at the old rate of 25p/kWh costs £25.
  • 150 kWh at the new rate of 30p/kWh costs £45.
  • Combined consumption charges are £70, before standing charges and any other applicable items.

Charging all 250 kWh at the new rate would give £75, which would not represent that allocation. Check whether actual or estimated boundary readings were used, and ask for the allocation method if it is unclear.

Standing charges also need the correct daily rate for each period. A bill can therefore contain several lines without necessarily charging twice for the same energy.

Why a lower cap may not mean a lower bill

You may use more energy after a rate reduction, particularly as the weather becomes colder. A falling price per kWh can be outweighed by increased consumption.

Your account balance can also change because of an earlier debt, payment or adjustment. Compare kWh, prices and account movements separately. The percentage movement in a typical annual cap figure is not a promised percentage change in your own bill.

If your Direct Debit changes

A monthly payment can be recalculated because of expected annual consumption, new prices, a credit or debt balance, or the period over which the supplier wants to recover it.

Ask for the calculation if it seems wrong. Citizens Advice explains how to question an increased Direct Debit. Do not cancel a payment arrangement without understanding the account consequences and discussing an affordable alternative where needed.

A five-minute quarterly check

  • Confirm the tariff you are on and whether a fixed period is ending.
  • Save the supplier’s rate-change notice and effective date.
  • Check actual or estimated readings, where relevant.
  • Compare unit rates and daily charges on the same tax basis.
  • Look at kWh used as well as pounds charged.
  • Check whether the Direct Debit remains supported by the account calculation.
  • Raise any discrepancy with the supplier and keep its response.

For support with an unaffordable payment, use our independent-help links. The useful habit is checking your own information, rather than reacting to the headline alone.

Sources and further reading

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