Kellas Midstream is a leading midstream infrastructure business in the UK which transports gas from the Central and Southern North Sea areas to the UK, where it is then processed on behalf of major North Sea gas producers. Kellas Midstream comprises of:

- Central Area Transmission System (“CATS”): a fixed offshore riser platform linked to Everest gas platform, a 404km long subsea pipeline connecting 34 producing fields and an onshore gas processing terminal at Teesside

- Esmond Transportation System (“ETS”): a 165km long subsea pipeline in the Southern North Sea connecting producing fields to the Bacton gas terminal 

- Humber Gathering System (“HGS”): a greenfield construction project to build the infrastructure required for the development of the Tolmount Main field (offshore platform, 48km long pipeline and modifications at the Easington gas processing terminal)