Integrated	BP Shell
Exploration & production	Afren BHP Cairn Energy Centrica Dana Petroleum Desire Petroleum Emerald Energy EnQuest Essar Energy Harbour Energy Hardy Oil and Gas JKX Oil & Gas Melrose Resources Ophir Energy Perenco Regal Petroleum Rockhopper Exploration SOCO International Star Energy Tullow Oil
Supply	Greenergy Murco Petroleum
Support	Abbot Group Amec Foster Wheeler Expro Hunting Petrofac Qserv Weir Group WesternGeco¹ Wood Group

Integrated

Generation
& supply

Generation	Drax Group Engie Energy International Falck Renewables Horizon Nuclear Power¹ Vattenfall United Kingdom¹ Vedanta Resources
Supply	100Green Bristol Energy Co-op Energy Ecotricity ESB International Firmus Energy Good Energy Octopus Energy Opus Energy Outfox the Market OVO Energy Phoenix Natural Gas Shell Energy TotalEnergies Gas & Power Utilita Energy Utility Warehouse

Distribution

Electricity	Electricity North West¹ Northern Powergrid¹ SP Energy Networks¹ SSE Power Distribution UK Power Networks¹ Western Power Distribution¹
Gas	Cadent Gas Firmus Energy Northern Gas Networks Phoenix Natural Gas SGN Wales & West Utilities¹

Transmission

Electricity	National Grid² Scottish Hydro Electric Transmission SP Energy Networks¹
Gas	National Grid

Other

Companies with headquarters and/or registered office in the UK but no applicable energy operations within the country shown in italics ¹Ultimate parent company is not UK-based ²Integrated in the United States, no generation or supply activities in the UK

Energy sources

Biofuels	Biodiesel Biofuel power stations National Non-Food Crops Centre Renewable Fuels Agency Renewable Transport Fuel Obligation
Geothermal	Geothermal power stations
Hydroelectricity	Hydroelectric power stations Severn Barrage Mersey Barrage Wave farms
Solar power
Wind power	Offshore wind power in the United Kingdom List of offshore wind farms List of onshore wind farms North Sea Offshore Grid Wind power in Scotland

Government and regulation

Organisations

Legislation and
initiatives

Non-governmental organisations

Charities and pressure groups	Ashden Award BioRegional Campaign against Climate Change Centre for Alternative Technology National Energy Action Stop Climate Chaos Tyndall Centre
Industry bodies	Combined Heat and Power Association Energy Institute Energy Networks Association Energy Retail Association Green Power Forum RenewableUK Utilities Intermediaries Association
Research	Centre for Renewable Energy Systems Technology Energy Technologies Institute Hadley Centre for Climate Prediction and Research Narec Oil Depletion Analysis Centre Sunbury Research Centre UK Energy Research Centre

Energy conservation
Association for the Conservation of Energy British Energy Efficiency Federation Close the Door campaign Code for Sustainable Homes Double Glazing & Conservatory Ombudsman Scheme EcoHomes Energy efficiency in British housing Energy Saving Trust Energy Saving Trust Recommended Greenhouse gas emissions HTB National Home Energy Rating