Policy Compass
Low carbon and nuclear energy

Sizewell C Ultimate Controller Undertaking: form

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Use the approved Sizewell C Ultimate Controller Undertaking form under the Nuclear Regulated Asset Base (RAB) Licence

Details

Under Special Condition 5 of the modified licence, an undertaking must be obtained from each relevant company or person within 7 Working Days of them becoming an Ultimate Controller. This licence requirement will take effect on the licence modification date for Sizewell C as determined by the Department for Energy Security and Net Zero. 

Main document

[Sizewell C Ultimate Controller Undertaking form [PDF, 130.41KB]

](https://www.ofgem.gov.uk/sites/default/files/2025-08/Sizewell-C-Form-of-Ultimate-Controller-Undertaking.pdf)

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