Star Energy Group PLC operates as a leading onshore energy producer in the United Kingdom, focusing on the extraction, development, and production of crude oil and natural gas alongside geothermal energy projects; it delivers hydrocarbons to Britain's energy market from 28 fields across more than 90 sites primarily in the East Midlands and Weald Basin in southern England, with average net production of approximately 1,900 barrels of oil equivalent per day, and leverages its subsurface expertise to develop renewable geothermal heat and power solutions in the UK and Croatia. Core products and services encompass onshore crude oil production from conventional reservoirs, natural gas extraction and processing, electricity generation from geothermal resources, and support activities for petroleum and gas operations including exploration, appraisal, and field management; the company operates through Oil and Gas and Geothermal segments, targeting domestic energy security while transitioning toward low-carbon alternatives such as large-scale geothermal heating for district networks, commercial buildings, hospitals, campuses, and industrial processes. Founded in 2003 and headquartered at Welton Gathering Centre in Sudbrooke, Lincoln, England, Star Energy Group PLC--formerly IGas Energy PLC until its name change in June 2023--maintains operations in the UK with geothermal expansion into Croatia via subsidiary GT Energy Croatia Limited, which holds exploration licenses like Ernestinovo for potential 10-MW geothermal power development. Recent developments include a May 2025 memorandum of understanding with Veolia to jointly advance large-scale geothermal heating projects using directional drilling and advanced modeling to decarbonize heat supply; an increased stake to greater than 50% in Croatian geothermal developer A14 Energy Limited in early 2025 for enhanced project flexibility; a technology collaboration with SLB announced in January 2025 to accelerate geothermal asset development through industrialized solutions; acquisition of GT Energy in 2020 to enter geothermal; and sale of non-core Alton land for GBP6 million in November 2024 to streamline operations. The company upholds strong environmental and community commitments, including the Star Energy Community Fund distributing over GBP1 million since 2008, while producing under SIC codes for crude petroleum extraction and petroleum support activities.