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Capacity Market

The Capacity Market ensures security of electricity supply by providing a payment for reliable sources of capacity.

Part of the government’s Electricity Market Reform package, the Capacity Market will ensure security of electricity supply by providing a payment for reliable sources of capacity, alongside their electricity revenues, to ensure they deliver energy when needed. This will encourage the investment we need to replace older power stations and provide backup for more intermittent and inflexible low carbon generation sources.

The Capacity Market has also been designed to support the development of more active demand management in the electricity market.

28 February 2019: Capacity Market: outcome of consultation on technical amendments

The government has published its response to the consultation on Proposals for technical amendments to the capacity market and laid the necessary regulations in Parliament.

This represents an important step in the government’s plans to see the Capacity Market (CM) back up and running as soon as possible, and follows last week’s opening decision from the Commission.

Today’s publication confirms the government will:

  • hold a replacement T-1 auction this Summer, for delivery in 2019/2020
  • allow capacity providers holding agreements greater flexibility in dealing with forthcoming milestones affected by the standstill period
  • broaden the Secretary of State’s discretion in dealing with termination and non-completion notices
  • ensure that suppliers are invoiced promptly and in full once the standstill period is over, and enable suppliers to make payments to the Settlement Body in the meantime

This provides certainty to suppliers (as foreshadowed by Ofgem’s recent price cap announcement) that they can and should be making provision by collecting the supplier charge from customers during the standstill period, and to CM agreement holders that deferred payments can be funded promptly and in full once the standstill period is over.

The consultation was launched on 19 December 2018 in response to the judgment by the Court of Justice of the EU.

6 December 2018: Capacity Market State Aid process

The UK government is working closely with the European Commission on the necessary steps for the GB Capacity Market (CM) scheme to be investigated as quickly as possible. This follows the judgment of the General Court of the Court of Justice of the European Union in Case T-793/14 and the standstill period it has imposed on the CM.

The Court did not find the design of the GB CM to be incompatible with State aid guidelines. As such, we are exploring together with the Commission the most rapid and effective path to conduct the formal investigation into the scheme in a way that meets all process requirements referred to in the judgment. The Commission envisages issuing an Opening Decision to open the formal investigation in early 2019. Subsequently, third parties will be able to submit comments on the decision.

It is one possible outcome of the investigation that the Commission reaches a positive decision after its investigation. This would mean that:

  • aid granted under the GB CM before the judgment would be considered compatible with the internal market (such as capacity agreements arising from auctions held to date, and capacity payments in respect of those agreements)
  • the results of all auctions to date would stand, and further auctions could be held

At the request of the UK government, National Grid and the Electricity Settlements Company are continuing to operate the Capacity Market scheme in the meantime, short of making payments, to ensure that capacity providers may be eligible for deferred payments after the standstill period (subject to State aid clearance). Additional actions will be taken to explore continuity in supplier charging arrangements.

We are working closely together with the Commission to ensure that the Commission has everything necessary to enable it to re-consider the case for approval of the CM scheme as quickly as possible.

The UK government will hold a T-1 top-up auction during summer 2019, for delivery in winter 2019/20, making any agreements conditional on the outcome of the Commission’s formal investigation. The UK government will shortly consult on necessary regulatory changes to allow for the possibility of a T-1 auction.

We will ensure that an appropriate process is followed in seeking the Commission’s State aid clearance for the GB CM scheme and that any mechanism to ensure security of supply in the UK is technology neutral and in line with the Guidelines on State aid for environmental protection and energy 2014-2020. We look forward to updating stakeholders on progress.

This page contains all the general information on the Capacity Market including the Capacity Market Regulations and Rules. Specific information on the auctions can be found at:

Capacity Market stakeholder events

Capacity Market Rules

The rules provide the detail for implementing the operating framework set out in regulations. This means that the rules focus on the technical and administrative rules and procedures for how the Capacity Market operates and includes matters such as procedures relating to the day-to-day running of the Capacity Market, the process by which capacity providers pre-qualify, and rules for running capacity auctions and issuing capacity agreements to successful bidders.

  1. Capacity Market Rules
  2. Draft Capacity Market Rules 2014
  3. Capacity Market: appeals process

Implementing Electricity Market Reform (Chapter 3)

Implementing Electricity Market Reform provides stakeholders with a comprehensive overview of EMR policy. The document includes chapters on the two main mechanisms that the government is introducing to reform the electricity market: Contracts for Difference (CFDs) and the Capacity Market, as well as detail on measures to encourage greater energy efficiency through the Electricity Demand Reduction (EDR) programme.

Impact Assessment on the Capacity Market (June 2014)

The June 2014 impact assessment provides the rationale for why the government is intervening in the market and the costs and benefits of the intervention.

  1. Proposals for implementation of Electricity Market Reform

Final Capacity Market Design presentation

A brief outline of the reasons a Capacity Market was introduced, and summary of the final design for the Capacity Market.

  1. Final Capacity Market Design presentation

Consultation and Amendments to Capacity Market Rules 2014

Consultation on proposed amendments to the Capacity Market Rules 2014 and explanation of some immediate amendments to the Capacity Market Rules 2014.

  1. Consultation and Amendments to Capacity Market Rules 2014

Reports and research

  1. Future potential for Demand Side Response in Great Britain
  2. Price duration equivalence report

Setting Capacity Market parameters

  1. Setting Capacity Market parameters
Published 24 July 2014
Last updated 1 March 2019 + show all updates
  1. Link to Government response to Capacity Market Technical Amendments consultation added.
  2. Capacity Market Technical Amendment consultation announced.
  3. Capacity Market State Aid Process statement published.
  4. Further information on the judgment 17 November 2018
  5. Government response to Tempus Energy Capacity Market State Aid Challenge published
  6. DECC, Ofgem, National Grid, ESC Event Capacity Market Stakeholder Workshop discussion summary
  7. Letter from Amber Rudd about the Electricity Market Reform capacity market auction 2015.
  8. Capacity Market - location of provisional results
  9. Update to the target capacity for the Capacity Market auction
  10. First published.