# The 50 largest energy companies in Australia
Tamtam tracks 126 energy companies headquartered in Australia. This list ranks the 50 largest by number of employees on LinkedIn, led by Greencap, Fortescue and Santos Ltd. Their median headcount is 1,752. Half of them were founded in 2000 or later. The most common headquarters are Sydney (8), Melbourne (7) and Perth (7).
The largest energy companies in Australia are primarily large groups in utilities, mining, and oil and gas. Greencap is a diversified corporation in home improvement and industrials. Fortescue supplies iron ore and develops green energy. Santos Ltd is a global energy company transitioning to lower carbon fuels. Origin Energy provides electricity, natural gas, and solar. Woodside Energy operates diversified oil and gas assets. AGL is an energy company transforming how energy is produced.
Most of these companies are headquartered in major cities. Sydney hosts Origin Energy, AGL, Glencore Australia, and APA Group. Perth is home to Greencap, Woodside Energy, and Western Power. This indicates a concentration of major energy operations in key urban centers across Australia.
π¦πΊ Australia Β· 50 companies Β· Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Greencap](https://www.tamtam.ai/c/wesfarmers) (wesfarmers.com.au)
A diversified corporation in Australia, providing goods and services in home improvement, apparel, office supplies, and industrials sectors while focusing on shareholder returns and corporate responsibility | Retail | π¦πΊ Perth | 107,000 | 1914 |
| 2 | [Fortescue](https://www.tamtam.ai/c/fortescue) (fortescue.com)
Supplying global steel industries with iron ore while developing green energy technologies and zero emission solutions to eliminate fossil fuels across operations. | Mining | π¦πΊ East Perth | 10,056 | 2003 |
| 3 | [Santos Ltd](https://www.tamtam.ai/c/santos-ltd) (santos.com)
Global energy company providing reliable, affordable energy; transitioning to lower carbon fuels, including oil, gas, and carbon capture solutions for homes and industries. | Oil and Gas | π¦πΊ Adelaide | 6,628 | 1954 |
| 4 | [Origin Energy](https://www.tamtam.ai/c/origin-energy) (originenergy.com.au)
Leading Australian energy company providing electricity, natural gas, solar, and LPG while focusing on affordability, sustainability, and carbon emissions reduction. | Utilities | π¦πΊ Sydney | 6,250 | 2000 |
| 5 | [Woodside Energy](https://www.tamtam.ai/c/woodside-energy) (woodside.com)
Operate diversified oil and gas assets globally with focus on safety, efficiency, environmental performance, and growth in gas, oil, and new energy sectors. | Oil and Gas | π¦πΊ Perth | 5,933 | 1954 |
| 6 | [AGL](https://www.tamtam.ai/c/agl) (agl.com.au)
A leading energy company in Australia, dedicated to transforming how energy is produced, shared, and consumed through sustainability and innovation | Utilities | π¦πΊ Sydney | 5,492 | 1837 |
| 7 | [Ampol](https://www.tamtam.ai/c/ampol) (ampol.com.au)
Leading Australian company managing extensive fuel refining, importing, marketing, and retail network serving millions across multiple sectors. | Oil and Gas | π¦πΊ Alexandria | 4,907 | |
| 8 | [Mineral Resources Limited](https://www.tamtam.ai/c/mineral-resources-limited) (mineralresources.com.au)
A leading diversified resources company operating in lithium, iron ore, energy, and mining services in Western Australia, known for innovation and strong performance | Mining | π¦πΊ Osborne Park | 4,163 | 1993 |
| 9 | [Glencore Australia](https://www.tamtam.ai/c/glencore-australia) (glencore.ws)
Leading Australian natural resource producer supplying coal, copper, zinc, nickel, and cobalt globally for energy, steel-making, and transitioning to a low-carbon future | Mining | π¦πΊ Sydney | 3,294 | |
| 10 | [Western Power](https://www.tamtam.ai/c/western-power) (westernpower.com.au)
Safe, reliable electricity transmission and distribution across south Western Australia, maintaining extensive network serving over one million customers. | Utilities | π¦πΊ Perth | 3,177 | |
| 11 | [APA Group](https://www.tamtam.ai/c/apa-group) (apa.com.au)
Ownership and management of a diverse $26 billion energy infrastructure portfolio delivering energy solutions across all Australian states and territories. | Utilities | π¦πΊ Sydney | 2,804 | 2000 |
| 12 | [Energy Queensland](https://www.tamtam.ai/c/energy-queensland) (energyq.com.au)
Energy Queensland powers communities across Queensland by effectively managing the state's electricity network, minimizing costs, and supporting regional growth and development | Utilities | π¦πΊ Newstead | 2,632 | 2016 |
| 13 | [RACV](https://www.tamtam.ai/c/racv) (racv.com.au)
A diverse organization offering competitive remuneration and career opportunities in areas like hospitality, financial services, public policy, and more | Civic and Social Organizations | π¦πΊ Melbourne | 2,602 | 1903 |
| 14 | [Ausgrid](https://www.tamtam.ai/c/ausgrid) (ausgrid.com.au)
Australia's largest electricity distributor supplying products and services to 17 million customers, focusing on affordability, reliability, sustainability, and stakeholder engagement | Utilities | π¦πΊ Haymarket | 2,469 | 1904 |
| 15 | [Veolia \| Australia & New Zealand](https://www.tamtam.ai/c/veolia-australia-and-new-zealand) (anz.veolia.com)
Provider of water and wastewater services, industrial cleaning, waste management, resource recovery, and energy solutions for heavy industry, businesses, and government sectors. | Environmental Services | π¦πΊ Pyrmont | 2,451 | 1867 |
| 16 | [Harbour Energy](https://www.tamtam.ai/c/harbour-energy) (harbourenergy.com)
A leading oil and gas corporation, publicly traded on the London Stock Exchange, specializing in independent operations within the industry | Oil and Gas | π¦πΊ Victoria | 2,324 | |
| 17 | [EnergyAustralia](https://www.tamtam.ai/c/energyaustralia) (energyaustralia.com.au)
A leading Australian energy company providing practical and sustainable energy solutions, including carbon neutral options, while supporting local communities and indigenous peoples | Utilities | π¦πΊ Melbourne | 2,286 | |
| 18 | [Essential Energy](https://www.tamtam.ai/c/essential-energy) (essentialenergy.com.au)
Builds, operates, maintains extensive electricity distribution network serving over 900,000 customers across diverse regional and rural communities. | Utilities | π¦πΊ Port Macquarie | 2,263 | |
| 19 | [INPEX Australia](https://www.tamtam.ai/c/inpex-australia) (inpex.com.au)
A leading oil and gas exploration company in Australia, involved in major projects like Ichthys LNG, with a strong focus on growth and success | Oil and Gas | π¦πΊ Perth | 2,160 | |
| 20 | [AusNet](https://www.tamtam.ai/c/ausnet) (ausnetservices.com.au)
Leading energy delivery service in Victoria with over $11 billion in assets, serving 15 million customers Engineering a sustainable future for Australia's infrastructure needs | Utilities | π¦πΊ Southbank | 2,006 | |
| 21 | [Transgrid](https://www.tamtam.ai/c/transgrid) (transgrid.com.au)
The company operates and maintains high voltage transmission infrastructure in NSW and the ACT, leading the transition to clean energy for a sustainable future | Utilities | π¦πΊ Sydney | 1,993 | |
| 22 | [Australian Energy Market Operator (AEMO)](https://www.tamtam.ai/c/australian-energy-market-operator-aemo) (aemo.com.au)
Operate Australia's largest gas and electricity markets, provide planning, forecasting, and security advice to ensure energy reliability and security. | Utilities | π¦πΊ Melbourne | 1,921 | 2009 |
| 23 | [Caltex Australia](https://www.tamtam.ai/c/caltex-australia) (caltex.com)
This company offers newly rebranded products and services in the automotive and energy sector | Oil and Gas | π¦πΊ Australia | 1,801 | |
| 24 | [SA Power Networks](https://www.tamtam.ai/c/sa-power-networks) (sapowernetworks.com.au)
Deliver electricity to 1.7 million customers, enable renewable energy solutions, ensure safety, and support South Australia's energy transition. | Utilities | π¦πΊ Keswick | 1,794 | 1946 |
| 25 | [CitiPower and Powercor](https://www.tamtam.ai/c/citipower-and-powercor) (powercor.com.au)
Operate electricity distribution networks serving 1.2 million customers, enabling renewable energy integration, ensuring safety, reliability, and supporting clean energy transition. | Utilities | π¦πΊ Melbourne | 1,752 | |
| 26 | [Powerlink Queensland](https://www.tamtam.ai/c/powerlink-queensland) (powerlink.com.au)
Ownership, operation, and maintenance of Queensland's high-voltage electricity transmission network serving millions of customers and large industrial users. | Utilities | π¦πΊ Virginia | 1,698 | |
| 27 | [ACCIONA AU & NZ](https://www.tamtam.ai/c/acciona-au-and-nz) (acciona.com.au)
Global leader in sustainable infrastructure solutions with a rich history of iconic projects, offering sustainable solutions in transport, water, and energy distribution | Construction | π¦πΊ Port Melbourne | 1,674 | |
| 28 | [Viva Energy Australia](https://www.tamtam.ai/c/viva-energy-australia) (vivaenergy.com.au)
Aiming for net zero emissions by 2050, this organization supports Australia's energy needs through innovative projects for sustainable energy solutions | Oil and Gas | π¦πΊ Docklands | 1,638 | 2014 |
| 29 | [Ergon Energy Network](https://www.tamtam.ai/c/ergon-energy-network) (ergon.com.au)
Supply electricity to over 746,000 customers across Queensland, ensuring safe, reliable, efficient, and sustainable energy solutions for diverse communities. | Utilities | π¦πΊ Townsville | 1,609 | |
| 30 | [Jemena](https://www.tamtam.ai/c/jemena) (jemena.com.au)
Provider of gas and electricity services with over a century of experience, supplying essential energy to millions of households and businesses | Utilities | π¦πΊ Melbourne | 1,560 | 2008 |
| 31 | [Dodo Services](https://www.tamtam.ai/c/dodo-services) (dodo.com)
Provider of telecommunications, energy, and insurance services focused on competitive pricing, customer choice, and delivering great value in Australia. | Telecommunications | π¦πΊ Melbourne | 1,526 | 2001 |
| 32 | [ANSTO](https://www.tamtam.ai/c/ansto) (ansto.gov.au)
A large public research organization in Australia, specializing in nuclear science and technology, hosting international collaborations and providing access to landmark infrastructure | Research Services | π¦πΊ Lucas Heights | 1,439 | |
| 33 | [Zinfra](https://www.tamtam.ai/c/zinfra) (zinfra.com.au)
Zinfra is a leading delivery partner in Australia's energy infrastructure sector, providing engineering, project management, construction, and maintenance services with a focus on inclusivity and diversity | Utilities | π¦πΊ Melbourne | 1,348 | 2012 |
| 34 | [Alinta Energy](https://www.tamtam.ai/c/alinta-energy) (alintaenergy.com.au)
A leading Australian utility providing gas and electricity generation, retail, and wholesale services with a focus on renewable energy development | Utilities | π¦πΊ Sydney | 1,342 | |
| 35 | [GenusPlus Group](https://www.tamtam.ai/c/genusplus-group) (genus.com.au)
Designs, constructs, maintains critical power and communications infrastructure across Australia, including transmission, substations, renewables, and communication solutions, supporting national development and progress. | Construction | π¦πΊ Belmont | 1,276 | 2018 |
| 36 | [Wesfarmers Chemicals, Energy & Fertilisers](https://www.tamtam.ai/c/wesfarmers-chemicals-energy-and-fertilisers) (wescef.com.au)
Operate chemical, energy, and fertiliser businesses serving domestic and international markets with innovative, sustainable solutions and industry-leading companies. | Chemical Manufacturing | π¦πΊ Perth | 1,259 | |
| 37 | [Endeavour Energy (NSW)](https://www.tamtam.ai/c/endeavour-energy-nsw) (endeavourenergy.com.au)
Manage extensive electricity distribution network serving millions in NSW, focusing on safety, reliability, sustainability, and community service. | Utilities | π¦πΊ Parramatta | 1,259 | 1912 |
| 38 | [Whitehaven Coal](https://www.tamtam.ai/c/whitehaven-coal) (whitehavencoal.com.au)
A leading coal producer in Australia, specializing in high-quality coal for power generation in Asia, with a focus on supporting local communities | Mining | π¦πΊ Sydney | 1,183 | |
| 39 | [CITIC Pacific Mining](https://www.tamtam.ai/c/citic-pacific-mining) (citicpacificmining.com)
operation of Australiaβs largest magnetite mine with advanced processing, power station, desalination, and export facilities supporting steel industry | Mining | π¦πΊ Perth | 1,179 | 2006 |
| 40 | [Hydro Tasmania](https://www.tamtam.ai/c/hydro-tasmania) (hydro.com.au)
Leading renewable energy provider with hydropower legacy, electricity retail, and hydropower consulting driving Australia's clean energy transition. | Renewable Energy Power Generation | π¦πΊ Hobart | 1,139 | 1914 |
| 41 | [Snowy Hydro](https://www.tamtam.ai/c/snowy-hydro) (snowyhydro.com.au)
Supply electricity to over one million customers, operate hydro, gas, diesel power stations, and develop renewable wind and solar projects. | Utilities | π¦πΊ Cooma | 1,064 | 2002 |
| 42 | [Synergy (Electricity Generation and Retail Corporation)](https://www.tamtam.ai/c/synergy-electricity-generation-and-retail-corporation) (synergy.net.au)
Leading energy generator and retailer supplying reliable, affordable electricity and gas to over one million residential and business customers in Western Australia. | Utilities | π¦πΊ Perth | 1,058 | 2006 |
| 43 | [MMA Offshore](https://www.tamtam.ai/c/mma-offshore) (cyanrenewables.com)
Specializes in high-specification vessel provision and marine/subsea services for offshore energy and maritime industries, cautioning against phishing schemes | Maritime Transportation | π¦πΊ Perth | 1,042 | 1982 |
| 44 | [Yancoal Australia Ltd](https://www.tamtam.ai/c/yancoal-australia-ltd) (yancoal.com.au)
Operate and manage nine coal mines across Australia, supporting regional communities, creating jobs, and contributing to economic prosperity. | Mining | π¦πΊ Sydney | 1,016 | |
| 45 | [Proman](https://www.tamtam.ai/c/proman) (proman.org)
A diversified energy producer with production assets in the US, Trinidad, and Oman, specializing in methanol, fertilizer, and natural gas | Chemical Manufacturing | π¦πΊ | 1,009 | 1984 |
| 46 | [Power and Water Corporation](https://www.tamtam.ai/c/power-and-water-corporation) (powerwater.com.au)
Specialists in gas, water, wastewater, electricity, and renewable energy services operating across Northern Territory's vast area. | Utilities | π¦πΊ Darwin | 980 | |
| 47 | [Stanwell Corporation Limited](https://www.tamtam.ai/c/stanwell-corporation-limited) (stanwell.com)
Leading electricity provider with efficient coal-fired power stations and expanding renewable energy portfolio to meet Queensland's future energy needs. | Utilities | π¦πΊ Brisbane City | 967 | 1997 |
| 48 | [Future Generation Joint Venture - FGJV](https://www.tamtam.ai/c/future-generation-joint-venture-fgjv) (futuregenerationjv.com.au)
Principal contractor for Snowy 20 project, bringing engineering expertise from three companies to deliver Australia's largest renewable energy project and benefit the community | Construction | π¦πΊ Cooma | 893 | 2019 |
| 49 | [Red Energy](https://www.tamtam.ai/c/red-energy) (redenergy.com.au)
Australian energy company providing affordable, personal, and simple energy solutions with local customer support and over 1200 employees. | Utilities | π¦πΊ Cremorne | 847 | 2004 |
| 50 | [EDL](https://www.tamtam.ai/c/edl-brisbane) (edlenergy.com)
Global producer of sustainable distributed energy, offering innovative solutions for reliable, cost-effective, and environmentally sustainable power generation across multiple continents | Renewable Energy Power Generation | π¦πΊ Brisbane | 828 | 1988 |
## How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
## More company lists in Australia
- [The largest companies in Australia](https://www.tamtam.ai/l/largest-companies-australia) (5,556)
- [Multinational companies in Australia](https://www.tamtam.ai/l/multinational-companies-australia) (1,184)
- [Retail chains in Australia](https://www.tamtam.ai/l/retail-chains-australia) (577)
- [Financial services firms in Australia](https://www.tamtam.ai/l/financial-services-firms-australia) (483)
- [Critical infrastructure operators in Australia](https://www.tamtam.ai/l/critical-infrastructure-operators-australia) (450)
- [Education providers in Australia](https://www.tamtam.ai/l/education-companies-australia) (402)
- [Healthcare providers in Australia](https://www.tamtam.ai/l/healthcare-providers-australia) (397)
- [Professional services firms in Australia](https://www.tamtam.ai/l/professional-services-firms-australia) (377)
- [Financial Services companies in Australia](https://www.tamtam.ai/l/financial-services-companies-australia) (373)
- [Government Administration companies in Australia](https://www.tamtam.ai/l/government-administration-companies-australia) (351)
- [Public sector organisations in Australia](https://www.tamtam.ai/l/public-sector-organisations-australia) (326)
- [Manufacturers in Australia](https://www.tamtam.ai/l/manufacturers-australia) (320)
- [Companies with a mobile app in Australia](https://www.tamtam.ai/l/companies-with-mobile-app-australia) (305)
- [Publicly traded companies in Australia](https://www.tamtam.ai/l/publicly-traded-companies-australia) (299)
- [Hospitals and Health Care companies in Australia](https://www.tamtam.ai/l/hospitals-and-health-care-companies-australia) (297)
- [Corporate groups and holding companies in Australia](https://www.tamtam.ai/l/holding-companies-australia) (280)
- [E-commerce companies in Australia](https://www.tamtam.ai/l/ecommerce-companies-australia) (247)
- [Retail companies in Australia](https://www.tamtam.ai/l/retail-companies-australia) (243)
- [Companies with in-house R&D in Australia](https://www.tamtam.ai/l/r-and-d-companies-australia) (235)
- [IT Services and IT Consulting companies in Australia](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-australia) (215)
- [Consulting firms in Australia](https://www.tamtam.ai/l/consulting-firms-australia) (210)
- [Non-profit Organizations companies in Australia](https://www.tamtam.ai/l/non-profit-organizations-companies-australia) (190)
- [Hotel and hospitality groups in Australia](https://www.tamtam.ai/l/hospitality-groups-australia) (188)
- [Construction companies in Australia](https://www.tamtam.ai/l/construction-companies-australia) (186)
## The same list elsewhere in Australia
- [Energy companies in New South Wales](https://www.tamtam.ai/l/energy-companies-new-south-wales) (31)
- [Energy companies in Victoria](https://www.tamtam.ai/l/energy-companies-victoria) (26)
- [Energy companies in Queensland](https://www.tamtam.ai/l/energy-companies-queensland) (25)
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Source: https://www.tamtam.ai/l/energy-companies-australia