Star Energy comprises 10 companies:

Star Energy Group Limited is headquartered at Grand Buildings, 1st Floor, 1-3 Strand, London WC2N 5EJ. The London office is the base for the executive directors together with the planning and financial functions.

Star Energy Limited is also headquartered at Grand Buildings, Strand, London and is the group’s operating consolidation company.

Star Energy Weald Basin Limited comprises the Weald Basin assets centred around the Humbly Grove gathering centre in Hampshire. In this area, the company owns and operates six producing oilfields, two gas fields and a number of power generation installations. The oil and gas fields are Humbly Grove, Herriard, Singleton, Storrington, Horndean, Palmers Wood, Bletchingley and Albury.

Star Energy (East Midlands) Limited comprises the East Midlands assets centred around the Welton gathering centre in Lincolnshire. The oil and gas fields are Welton, Stainton, Nettleham, Cold Hanworth, Scampton, Scampton North and Eskdale.

Star Energy HG Gas Storage Limited owns and operates the Humbly Grove gas storage facility.

Star Energy Gas Storage Services Limited provides services to Star Energy gas storage projects.

Star Energy Oil UK Limited operates the oilfields centred around Stockbridge in Hampshire including Avington, and Goodworth.

Star Energy Oil and Gas Limited operates the oilfields around Gainsborough in Lincolnshire. These fields comprise Gainsborough/Beckingham, Egmanton, Corringham, Glentworth, East Glentworth, Rempstone, Long Clawson, Bothamsall and South Leverton. In addition, the company operates a number of power generation installations and supplies natural gas to a number of industrial consumers in Gainsborough.

Overseas Gas Storage Limited and Gas Storage Limited hold interests in gas storage development of the Waalwijk field in the Netherlands