This is a list of public utilities.

Natural gas companies

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

Electricity companies

•  Australia - 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
•  Bangladesh - Summit Group, Power Grid Company of Bangladesh Ltd, Electricity Generation Company of Bangladesh Ltd
•  Barbados - Barbados Light and Power Company Ltd.
•  Belgium - Electrabel
•  Botswana - Botswana Power Corporation
•  Brazil - Eletrobrás, AES Eletropaulo, CPFL Energia, Celesc, CEMIG, CESP, Copel, Light S.A., CEEE, Energisa
•  Canada - List of Canadian electric utilities
•  China - State Grid Corporation, China Southern Power Grid
  •  Hong Kong - Hongkong Electric, CLP Power
  •  Macau - Companhia de Electricidade de Macau
•  Cuba - Union Electrica
•  Czech Republic - CEZ Group
•  Egypt - Egyptian Electricity Holding Company
•  Ethiopia - Ethiopian Electric Power Corporation
•  Finland - Fortum
•  France - EDF, Engie, List of French electric utilities
•  Germany - E.ON, RWE, EnBW
•  Greece - PPC (DEI) (Greek Hydro), List of electric power companies in Greece
•  Iceland - Orkuveita Reykjavíkur
•  India - 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
•  Indonesia - Perusahaan Listrik Negara
•  Italy - Enel, Edison, A2A, ACEA, Hera, Sorgenia
•  Japan - 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
•  Libya - Gecol
•  Malaysia - Tenaga Nasional Berhad
•  New Zealand - Genesis Energy, Mercury Energy, Meridian Energy, Transpower
•  Philippines - Meralco
•  Singapore - Singapore Power
•  South Africa - Eskom
•  South Korea - Korea Electric Power Corporation
•  Spain - Endesa, Iberdrola, Naturgy, Repsol, TotalEnergies
•  Sweden - Vattenfall
•  Taiwan - Taiwan Power Company
•  Thailand - Electricity Generating Authority of Thailand, Provincial Electricity Authority, Metropolitan Electricity Authority
•  United Kingdom - EDF Energy, E.ON UK, National Grid, RWE npower, Scottish Power, Scottish and Southern Energy, Drax Power and Good Energy, Ecotricity, Alkane Energy, Ovo Energy
•  United States - List of United States electric companies

Telephone companies

•  Australia - Telstra, Optus, Vodafone, Hutchison Telecom(3G network), AAPT, Primus Telecom, Nextgen Networks, Agile Communications, TransACT
•  Barbados - Liberty Latin America
•  Botswana - Botswana Telecommunications Corporation
•  Brazil - Brasil Telecom, Oi, Vivo, TIM, Telefónica Brasil
•  Canada - List of Canadian telephone companies
•  China
  •  Hong Kong - PCCW Limited, New World Telephone, Hutchison Telecom
  •  Macau - Companhia de Telecomunicações de Macau
•  Cuba - ETECSA
•  Egypt - telecom egypt, orange egypt, vodafone egypt, etisalat egypt
•  France - List of French telephone companies
•  Germany - Deutsche Telekom, Arcor AG, Freenet AG, T-Mobile, Vodafone Germany,1&1 Aktiengesellschaft [de]1&1 Drillisch
•  Greece - Hellenic Telecommunication Organization
•  India - Airtel, BSNL, MTNL, Vodafone Idea, Jio
•  Indonesia - Telkom
•  Ireland - Eircom, BT Ireland, Smart Telecom, Vodafone Ireland, Hutchison 3G, O2 (Telefónica Europe)
•  Italy - List of Italian telephone companies
•  Japan - NTT, (NTT East, and NTT West)
•  Malaysia - Telekom Malaysia
•  Pakistan - Mobilink, Ufone, Telenor, Zong
•  Philippines - Philippine Long Distance Telephone Company
•  Singapore - SingTel
•  South Africa - Telkom
•  Spain - Telefónica, Orange, Vodafone, Yoigo
•  Taiwan - Chunghwa Telecom, FarEasTone, Taiwan Mobile
•  Thailand - TOT, CAT Telecom, True Corporation, DTAC, AIS, JAS Mobile
•  United States - List of United States telephone companies

Water companies

•  Australia - Unitywater, Queensland Urban Utilities
•  Barbados - Barbados Water Authority
•  Botswana - Water Utilities Corporation
•  Brazil - Sabesp, Sanepar, Copasa, Semasa
•  China
  •  Hong Kong - Water Supplies Department
  •  Macau - Macao Water
•  Egypt - Holding company for water and wastewater, Alexandria Water Company
•  France - SAUR, Suez Environnement, Veolia Environnement
•  Greece - EYDAP
•  Ireland - Irish Water
•  Italy - Hera, Seabo
•  Philippines - Maynilad Water Services, Manila Water Company, Inc., Metropolitan Waterworks and Sewerage System
•  Spain - Canal de Isabel II, Grupo Agbar
•  Taiwan - Taiwan Water Corporation
•  United Kingdom - List of United Kingdom water companies
•  United States - List of United States water companies

Steam companies

Note: some of these companies are still trading, others are listed here for historical interest.

• 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 * Brazil
• Liverpool Hydraulic Power Company * UK
• London Hydraulic Power Company, defunct since 1977 * UK