The register
The register lists Clean Energy Transition LLP in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Clean Energy Transition LLP is the registered name (Companies House number OC436380), a limited liability partnership on the register since 2021. Registered office: Second Floor, 24 St. James's Square, London, SW1Y 4JH, SW1Y 4JH.
A licence says an organisation may sponsor; it does not say it is hiring today. The way to find out is the same as for any employer: the careers page, the job boards, and a direct approach with a UK-style CV that says early that sponsorship would be needed.