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Call for evidence outcome

Capacity Market: Hydrogen to Power and interconnectors

From:
Department for Energy Security and Net Zero
Published
2 October 2025
Last updated
14 May 2026 — See all updates

Applies to England, Scotland and Wales

This call for evidence has closed

Read the full outcome

Capacity Market: Hydrogen to Power and interconnectors - government response

PDF, 320 KB, 32 pages

Adjustment of technical adjustment methodology for de-rating interconnectors in the Capacity Market

PDF, 318 KB, 14 pages

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Detail of outcome

Following the call for evidence on Hydrogen to Power and interconnectors, this government response summarises stakeholder feedback and sets out next steps for policy development within the Capacity Market.

The update confirms changes to the methodology used to calculate interconnector de‑rating factors, which will be implemented ahead of Capacity Market Prequalification 2026, and outlines the government’s ongoing approach to enabling Hydrogen to Power participation.

Original call for evidence

Summary

We're seeking views on enabling the participation of Hydrogen to Power in the Capacity Market and technical changes to setting interconnector de-rating factors.

This call for evidence ran from
to

Call for evidence description

Ensuring security of electricity supply is vital to successfully achieving the Prime Minister’s Clean Energy Superpower Mission.

The Capacity Market is at the heart of the government’s strategy for ensuring security of electricity supply in Great Britain. It was first introduced in 2014 as part of the Electricity Market Reform programme to support investment in capacity and deliver value for money for consumers.

The Capacity Market Rules (the Rules), which set out the requirements on its participants, are regularly reviewed. This is to ensure the scheme remains fit for purpose and reflects changing market conditions. To support future policy development, the government is publishing this call for evidence to: 

  • Gather evidence to inform how Hydrogen to Power (H2P) plants should be categorised within the CM to enable the participation of H2P as a new technology. This includes gathering evidence related to the operation and reliability of H2P plants.
  • Test stakeholder views on updating the methodology for the technical adjustment element of the process by which interconnector de-rating factors are set, including testing how high-impact low-probability events should be treated within this methodology.

The call for evidence is open to anyone to respond to, but will be of particular interest to:

  1. Energy industry
  2. Consumer groups
  3. Academia
  4. Think tanks
  5. Other organisations who have an interest in security of supply and decarbonisation

Read our consultation privacy notice.

Documents

Capacity Market: hydrogen and interconnectors - call for evidence

PDF, 330 KB, 30 pages

Updates to this page

Published 2 October 2025
Last updated 14 May 2026 show all updates

  1. Published the government response to this call for evidence.

  2. First published.

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