Prepayment price cap

On 1 April 2017, the amount of money suppliers can charge a domestic prepayment meter (PPM) customer per unit of energy became subject to a prepayment price cap.

We extended the prepayment price cap to a further one million vulnerable customers in receipt of the government’s Warm Home Discount on 2 February 2018 (under the label of a ‘safeguard tariff’). Customers who get the Warm Home Discount and are on a standard variable or default tariff were price protected at the level of the prepayment price cap for these tariffs until the end of 2018, after which they were transferred to the default tariff price cap.

Suppliers can charge less than the set level of the prepayment meter price cap, but not more. It doesn’t cap the total cost of a bill. That’s because the amount customers pay also depends on how much gas or electricity they’ve used. 

The prepayment meter price cap is one of the remedies introduced following the Competition and Markets Authority’s (CMA) investigation into the energy markets. It's temporary, and is due to expire at the end of 2020 when the smart meter rollout is expected to complete. It covers all domestic prepayment customers (except those with a fully interoperable smart meter).

On 19th July, the Domestic Gas and Electricity (Tariff Cap) Act 2018 came into force. This legislation requires the introduction of a temporary tariff cap for customers on Standard Variable (SVT) and default tariffs (the ‘default tariff cap’). On 6 November 2018, we announced our decision on our methodology to set the cap.

The default tariff cap came into effect on 1 January 2019, bringing further price protection for all customers on poor value standard variable and default tariffs. More information can be found here.

Prepayment meter price cap levels

Ofgem is responsible for administering the prepayment price cap. The level of the cap will be updated on 1 April and 1 October each year. 

At the beginning of every February and August, we publish the details of the cap for the forthcoming charge restriction period. We publish separate levels of the cap for each region and meter type, calculated using a methodology designed by the CMA. This methodology sets the level of the cap based on calculations of: wholesale costs, network costs, policy costs, operating costs, and costs specifically associated with prepayment meters. It also includes a degree of ‘headroom’, which is designed to allow suppliers to offer competitive deals underneath the cap.

The update on 1 April 2019 will increase the dual fuel cap by £106 from its previous level. This is at current typical domestic consumption levels, which are different from the CMA model consumption levels. 

Further guidance for suppliers

Suppliers looking for additional guidance on how to use the latest prepayment meter price cap levels to ensure that their prepayment tariffs comply with the cap should refer to the document on our page prepayment meter price cap - reporting template and FAQ.

Publications and updates

  • Published: 7th Feb 2019
  • Guidance
  • 2 Associated documents
Details of the reporting template that suppliers are required to complete to demonstrate their compliance with the prepayment price cap.

  • Published: 7th Feb 2019
  • Charts and data, Open letters and correspondence
  • 4 Associated documents
This document sets out the level of the prepayment meter price cap, which will apply for the period 1 April 2019 to 30 September 2019.

  • Published: 7th Aug 2018
  • Charts and data
  • 3 Associated documents
These tables set out the level of the prepayment price cap that will apply for the period 1 October 2018 to 31 March 2019.

  • Published: 28th Mar 2018
  • Guidance
  • 2 Associated documents
Reporting template for the WHD safeguard tariff (SLC 28AA).

  • Published: 7th Feb 2018
  • Charts and data
  • 3 Associated documents
These tables set out the level of the prepayment price cap that will apply for the period 1 April 2018 to 30 September 2018.

  • Published: 7th Aug 2017
  • Agendas, minutes and presentations
  • 1 Associated documents
Presentation slides explaining the prepayment price cap, or 'safeguard tariff'.

  • Published: 7th Aug 2017
  • Charts and data
  • 3 Associated documents
These tables set out the level of the prepayment price cap that will apply for the period 1 October 2017 to 31 March 2018.

  • Published: 4th Aug 2017
  • Decisions, Guidance
  • 1 Associated documents
A direction to suppliers pursuant to standard licence conditions 28A.27 of the electricity supply licence.

  • Published: 3rd Jul 2017
  • Open letters and correspondence
  • 1 Associated documents
Our letter to suppliers describing the key dates leading up to the second Charge Restriction Period for the prepayment price cap, due to take effect on 1 October 2017.

  • Published: 23rd Mar 2017
  • Decisions, Guidance
  • 2 Associated documents
Temporary directions issued pursuant to SLCs 28A.21 and 28A.22 of the electricity supply licence, and SLCs 28A.19 and 28A.20 of the gas supply licence.

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