Australian renewable energy company Atmos Renewables has reached an agreement to purchase Neoen's majority stake in the 316MW Hornsdale wind farm, South Australia.

The acquisition represents a significant operational milestone for the company and strengthens its presence as a long-term renewable energy operator across the country.

It also reinforces its presence across all connected states, including the National Electricity Market (NEM) and Wholesale Electricity Market (WEM).

Operational since 2017, Hornsdale supplies clean energy to the Australian Capital Territory (ACT) government under a feed-In tariff arrangement.

Atmos previously held minority stakes across three stages of Hornsdale and will now assume full ownership upon completion of the transaction, which is expected in late 2025.

The deal will elevate Atmos's internally managed portfolio to more than 1GW for the first time, enhancing the company’s operational capabilities.

Atmos Renewables CEO Nigel Baker stated: “This is a milestone that reflects not just scale, but operational maturity. Managing more than 1GW of clean energy assets in-house signals that we’re here for the long haul and set up for further growth – with the people, systems and experience to operate responsibly and efficiently at scale.

“As we grow, we remain focused on delivering energy reliably and continuing strong, respectful relationships with the communities and stakeholders who host our projects.”

Atmos has more than 1.5GW of wind, solar, and battery assets across 18 projects in Australia.

Several other capacity development projects within its portfolio are currently progressing, such as the 100MW/400 megawatt-hour Merredin battery energy storage system in Western Australia.

In June 2025, GenusPlus Group secured a contract valued at A$65m ($45.13m) from Atmos Renewables for the design and construction of the Merredin BESS, and associated substation works.