AGL Energy Ltd is an Australian listed public company involved in both the generation and retailing of electricity and gas for residential and commercial use.

[12] Twenty-five per cent owned by AGL Energy, ActewAGL provides electricity, natural gas, and telecommunication services to business and residential customers in the Australian Capital Territory and south-east New South Wales.

[18] On 6 October 2006, the Australian Gas Light Company and Alinta merged and restructured to create two new listed companies, a restructured Alinta Ltd and AGL Energy Ltd.[19] In Victoria, in June 2012, AGL Energy acquired Loy Yang A Power Station and the Loy Yang coal mine.

[24] Turnbull said the government had been advised that if the Liddell plant were to close in 2022, there would be a 1,000 MW gap in base load, dispatchable power generation.

[30][31] In June 2021, AGL announced its intention to split into a bulk power generator and a carbon-neutral energy retailer.

[51] In 2015 the New South Wales Environment Protection Authority ordered the suspension of AGL's Gloucester operations after finding toxic chemicals had been introduced into Hunter Water's systems.

[52] The EPA subsequently found no "evidence of harm to the environment or pollution of waters"[53] and AGL was allowed to continue its Gloucester operations.

[54] In February 2016, AGL announced that exploration and production of natural gas assets would no longer be a core business for the company.

This followed years of campaigning, including protests at shareholder meetings and a non-violent blockade of exploration sites, by anti-CSG community group Groundswell Gloucester.

In April 2019, AGL announced that it had acquired the right to develop a pumped hydroelectric energy storage project in the mined-out main pit of the Kanmantoo mine on the eastern side of the Adelaide Hills in South Australia.

[65] The Australian Government Clean Energy Regulator publishes an annual list of the ten largest emitters of greenhouse gases.

AGL is responsible for more than double the carbon emissions of Australia's second-biggest electricity generator, and more than BHP, Rio Tinto, Glencore, and Qantas combined.

[67] In June 2016, Queensland Investment Corporation and the Future Fund joined AGL as investors in Powering Australian Renewables.