The register
The register lists Dalkia Energy Services Ltd 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).
Companies House lists it as Dalkia Energy Services Limited, number 07023025, incorporated 2009: 17 years of filings behind the name. Registered office: 15th Floor 1 Angel Court, London, EC2R 7HJ, EC2R 7HJ. By its SIC codes the business is in professional and technical services. It has traded under other names before, including Breathe Energy Ltd.
For a candidate this means one less obstacle: Dalkia Energy Services Ltd already has the licence most employers would have to apply for. The rest is the ordinary job of getting the interview.