When it comes to powering Australian homes and businesses, six names stand out.

The biggest energy companies in Australia, often referred to as the Big Six, dominate the market with their scale, services, and reach. These companies are not just power providers — they influence pricing, infrastructure, sustainability, and innovation across the energy landscape.

If you’re looking to better understand who these suppliers are, what they offer, and how they compare, this guide breaks it all down in a simple, human way.

Who Are the Big Six?

In Australia, the Big Six energy suppliers are:

AGL Energy

Origin Energy

EnergyAustralia

Ergon Energy

ActewAGL

Aurora Energy

These six energy retailers collectively serve millions of households across different states and territories. Some are government-owned; others are private. Some focus on metro cities; others serve rural regions.

Let’s look at each one.

1. AGL Energy — The Original Powerhouse

One of the oldest and biggest energy companies in Australia, AGL Energy dates back to 1837.

With over 4 million customers, AGL offers electricity, gas, and solar services across New South Wales, Victoria, Queensland, and South Australia.

While it has faced criticism for its coal-fired plants, AGL has pledged net-zero emissions by 2050 and is investing in renewable energy, including solar farms and grid-scale batteries.

For tech-focused users, AGL’s mobile apps, usage monitoring, and flexible billing plans are a big plus.

2. Origin Energy — Flexible and Future-Focused

Origin Energy operates across the country and serves millions of residential and commercial customers.

It’s well-known for its investments in renewable energy and innovations like its hydrogen exploration programs. Origin is also behind community-based solar initiatives, allowing users to share excess solar energy with others.

Their energy plans offer flexibility — fixed-rate, variable, carbon-neutral — and their customer service channels are among the most responsive.

If you’re environmentally conscious or looking for energy tailored to your lifestyle, Origin is worth considering.

3. EnergyAustralia — Transparent, Reliable, and Greener

With roots in Melbourne, EnergyAustralia operates in Victoria, NSW, Queensland, and South Australia.

They’ve committed to phasing out coal by 2040 and are investing over $1 billion in green energy. The company is actively transitioning toward a cleaner, more sustainable grid.

What customers love most? Their transparent billing, easy-to-use dashboards, and smart tools that help you manage costs.

It’s a practical option if you want control over your energy consumption without diving into the weeds.

4. Ergon Energy — Built for the Bush

Serving regional Queensland, Ergon Energy is a government-owned utility that covers 97% of the state’s geography.

It may not be as flashy as private players, but for regional and remote communities, it’s a lifeline. Ergon ensures reliable power even in cyclone-prone or sparsely populated zones.

It’s also actively encouraging solar adoption in rural areas and runs programs to educate communities about energy use.

For those in the outback or coastal towns, Ergon is more than a provider — it’s infrastructure.

Read More: Best Electricity Providers in NSW: How to Save on Energy Bills

5. ActewAGL — Canberra’s Local Hero

Based in the Australian Capital Territory, ActewAGL is a joint venture between AGL and Icon Water.

It serves residents in ACT and parts of NSW, offering electricity, gas, and solar services.

ActewAGL focuses heavily on the community — whether it’s sponsoring local events or offering energy efficiency upgrades for low-income households.

They’re also among the more affordable utility companies in Australia, especially for ACT residents.

If personal touch matters to you, ActewAGL has a strong local presence.

6. Aurora Energy — Powering Tasmania with Stability

Aurora Energy is Tasmania’s state-owned energy retailer and the only major player on the island.

It benefits from Tasmania’s clean hydroelectric power, keeping prices relatively stable and emissions low.

Aurora’s customer service is solid, and the company offers budget plans, digital tools, and support for vulnerable customers.

For Tasmanians, Aurora isn’t just the default — it’s a trusted local utility aligned with community values.

Final Thoughts: Understanding Utility Companies in Australia

Choosing the right provider isn’t just about price — it’s about service, values, and where you live.

The biggest energy companies in Australia — the Big Six — cover most of the map and offer a variety of plans, tools, and innovations. Whether you live in a major city or a remote town, these utility companies in Australia have options that can match your lifestyle and energy goals.

Looking for solar incentives? Focus on AGL or Origin.
Want strong community support? ActewAGL or Ergon are great bets.
Need something simple and stable? Aurora or EnergyAustralia might be for you.