Call for Evidence on the correct regulatory treatment of assets dedication to provision of ancillary services
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In our letter of October 2021 relating to our decision to grant storage licences in the near term to Synchronous Condensers, we committed to conducting a review of the regulatory and licensing treatment of these and similar assets which are dedicated to providing system ancillary services. We are beginning this review through this call for evidence, to help inform the correct enduring licensing and regulatory treatment to ensure competition and lowest cost solutions for the end consumer.
Please respond to the questions in this call for evidence by 31st May 2022, by emailing ESOperformance@ofgem.gov.uk.
Main document
[Call for Evidence – Review of arrangements for electricity ancillary services [PDF, 114.67KB]
Subsidiary documents
[ADE response [PDF, 110.13KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/ADE%20Response.pdf)
[Energy Systems Catapult response [PDF, 174.73KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Energy%20Systems%20Catapult%20Response.pdf)
[ESB response [PDF, 182.92KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/ESB%20Response.pdf)
[National Grid Electricity System Operator response [PDF, 147.27KB]
[National Grid Electricity Transmission response [PDF, 154.94KB]
[Octopus Energy response [PDF, 40.98KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Octopus%20Energy%20Response.pdf)
[RWE response [PDF, 233.62KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/RWE%20Response.pdf)
[Scottish Power response [PDF, 936.71KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Scottish%20Power%20Response.pdf)
[Sembcorp response [PDF, 131.60KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Sembcorp%20Response.pdf)
[SP Energy Networks response [PDF, 186.51KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/SP%20Energy%20Networks%20Response.pdf)
[SSE response [PDF, 277.84KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/SSE%20Response.pdf)
[Transmission Investment response [PDF, 265.12KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Transmission%20Investment%20Response.pdf)
[UK Power Networks response [PDF, 451.03KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/UK%20Power%20Networks%20Response.pdf)