List of public utilities

[Natural gas] companies

• - National Petroleum Corporation, Barbados National Oil Company Ltd.
• - Comgás
• - List of Canadian natural gas companies
• - China Natural Gas, Towngas China
• * - China Resources Gas, The Hong Kong and China Gas Company
• - EGAS
• - List of French natural gas companies
• - List of Japan natural gas companies
• - Petronas
• - Sui Northern Gas Pipelines Limited, Sui Southern Gas Company Limited
• - Endesa, Iberdrola, Naturgy, Repsol, TotalEnergies
• - CPC Corporation
• - PTT
• - List of British natural gas companies
• - List of United States natural gas companies

Electricity companies

• - Lumo Energy, EnergyAustralia, Origin Energy, TRUenergy, SEC Victoria (fmr.), Powercor, Click Energy, AGL, Alinta, Citipower, ETSA Utilities, Western Power, Country Energy, Energex, Integral Energy, ActewAGL, Ergon Energy, Power and Water
• - Summit Group, Power Grid Company of Bangladesh Ltd, Electricity Generation Company of Bangladesh Ltd
• - Barbados Light and Power Company Ltd.
• - Electrabel
• - Botswana Power Corporation
• - Eletrobrás, AES Eletropaulo, CPFL Energia, Celesc, CEMIG, CESP, Copel, Light S.A., CEEE, Energisa
• - List of Canadian electric utilities
• - State Grid Corporation, China Southern Power Grid
• * - Hongkong Electric, CLP Power
• * - Companhia de Electricidade de Macau
• - Union Electrica
• - CEZ Group
• - Egyptian Electricity Holding Company
• - Ethiopian Electric Power Corporation
• - Fortum
• - EDF, Engie, List of French electric utilities
• - E.ON, RWE, EnBW
• - PPC (DEI), List of electric power companies in Greece
• - Orkuveita Reykjavíkur
• - List of Electricity Organizations in India, India: NTPC, Power Grid Corporation of India Ltd.(PGCIL), KPTCL, MSEB, Tata Power, BSES Rajdhani Power Ltd New Delhi, BSES Yamuna Power Ltd New Delhi
• - Perusahaan Listrik Negara
• - Enel, Edison, A2A, ACEA, Hera, Sorgenia
• - Kansai Electric Power, Tokyo Electric Power, Chubu Electric Power, Chugoku Electric Power, Hokuriku Electric Power, Hokkaido Electric Power, Kyushu Electric Power, Tohoku Electric Power, Shikoku Electric Power, Okinawa Electric Power, J-POWER
• - Gecol
• - Tenaga Nasional Berhad
• - Genesis Energy, Mercury Energy, Meridian Energy, Transpower
• Norway - Statnett
• - Meralco
• - Singapore Power
• - Eskom
• - Korea Electric Power Corporation
• - Endesa, Iberdrola, Naturgy, Repsol, TotalEnergies
• - Vattenfall
• - Taiwan Power Company
• - Electricity Generating Authority of Thailand, Provincial Electricity Authority, Metropolitan Electricity Authority
• - EDF Energy, E.ON UK, National Grid, RWE npower, ScottishPower, Scottish and Southern Energy, Drax Power and Good Energy, Ecotricity, Alkane Energy, Ovo Energy
• - List of United States electric companies

[Telephone] companies

• - Telstra, Optus, Vodafone, Hutchison Telecom, AAPT, Primus Telecom, Nextgen Networks, Agile Communications, TransACT
• - Liberty Latin America
• - Botswana Telecommunications Corporation
• - Brasil Telecom, Oi, Vivo, TIM, Telefónica Brasil
• - List of Canadian telephone companies
• * - PCCW Limited, New World Telephone, Hutchison Telecom
• * - Companhia de Telecomunicações de Macau
• - ETECSA
• - telecom egypt, orange egypt, vodafone egypt, etisalat egypt
• - List of French telephone companies
• - Deutsche Telekom, Arcor AG, Freenet AG, T-Mobile, Vodafone Germany,1&1 Drillisch
• - Hellenic Telecommunication Organization
• - Airtel, BSNL, MTNL, Vodafone Idea, Jio
• - Telkom
• - Eircom, BT Ireland, Smart Telecom, Vodafone Ireland, Hutchison 3G, O2 (Telefónica Europe)
• - List of Italian telephone companies
• - NTT,
• - Telekom Malaysia
• - Mobilink, Ufone, Telenor, Zong
• - Philippine Long Distance Telephone Company
• - SingTel
• - Telkom
• - Telefónica, Orange, Vodafone, Yoigo
• - Chunghwa Telecom, FarEasTone, Taiwan Mobile
• - TOT, CAT Telecom, True Corporation, DTAC, AIS, JAS Mobile
• - List of United States telephone companies

[Water] companies

• - Unitywater, Queensland Urban Utilities
• - Barbados Water Authority
• - Water Utilities Corporation
• - Sabesp, Sanepar, Copasa, Semasa
• * - Water Supplies Department
• * - Macao Water
• - Holding company for water and wastewater, Alexandria Water Company
• - SAUR, Suez Environnement, Veolia Environnement
• - EYDAP
• - Irish Water
• - Hera, Seabo
• - Maynilad Water Services, Manila Water Company, Inc., Metropolitan Waterworks and Sewerage System
• - Canal de Isabel II, Grupo Agbar
• - Taiwan Water Corporation
• - List of United Kingdom water companies
• - List of United States water companies

Steam companies

• American District Steam Company
• Boston Heating Company
• Compagnie Parisienne de Chauffage Urbain
• Detroit Thermal
• New York Steam Company, now Con Edison Steam Operations
• Trigen Energy Corporation

Former hydraulic power companies

• Itaipú Binacional *
• Liverpool Hydraulic Power Company *
• London Hydraulic Power Company, defunct since 1977 *