Michael Jack Sparkes

Part of Northern Powergrid Gas Ltd., CalEnergy Gas (Holdings) Ltd. functions as an investment holding British company. The company is based in Newcastle-upon-Tyne, UK.

Part of Berkshire Hathaway, Inc., CalEnergy Resources Ltd. is a subsidiary of Northern Powergrid, which participates in upstream oil and gas projects. The company has three offices located in London, UK, Perth, Western Australia, and Warsaw. CalEnergy has been active in oil and gas since the 1970s and has participated in all phases of the upstream business. Michael Jack Sparkes has been the CEO of the British company since 1989.

Northern Powergrid Gas Ltd. is a holding British company that invests in oil and gas assets through its subsidiaries. The private company is based in Newcastle-upon-Tyne, UK. and has subsidiaries in United Kingdom. The company was founded in 2001.

Part of Berkshire Hathaway, Inc., Calenergy Gas Ltd. provides support activities for petroleum and natural gas extraction. The company is based in London, UK.

Founded in 2019, Calenergy Resources (UK) Ltd. is a subsidiary of Berkshire Hathaway, Inc. that engages in the extraction of crude petroleum and natural gas. The company is based in London, UK.