Fortescue fast-tracks 'world's largest off-grid system' with 4-5GWh battery storage in Australia

The project accelerates the company’s ‘Real Zero’ decarbonisation plan, which initially aimed to reach zero emissions across its scope one and two emissions by 2030. In comments made on LinkedIn, Fortescue’s health and safety and R&D superintendent Daniel Hewitt said that the project would require US$6.2 billion in capex, but that it would “pay itself back in a few years” by slashing diesel-related opex costs by US$818 million per year from 2030.

The portfolio will be built in and designed to provide power for the company’s extensive mining operations in the Pilbara region of Western Australia. Earlier this year, the company started construction at a 440MW solar PV project in the region, which it claimed would be the largest such project in the state upon completion in 2028 and forms part of the renewables-plus-storage hub.

In December 2025 CEO Dino Otranto claimed the company had secured low “pricing that hasn’t really been seen” for its battery projects in the region.

Western Australia is home to some of the world’s deepest iron ore reserves, and these deposits have formed the bedrock of Fortescue’s work since its inception. The miner shipped a record 198.4 million tonnes of iron ore in the 12 months to June 2025, up from 191.6 million tonnes in the previous 12 months, and Fortescue said last July that it expects to grow iron ore export volumes by up to 3% in the next year.

On the same day as it announced its record mining exports, Fortescue cancelled two green hydrogen projects under development in the US state of Arizona, citing the Trump administration’s hostile attitude towards the energy transition. Following these cancellations, and the announcement of record iron ore sales, the value of the company’s shares increased by 4%.

This article first appeared on PV Tech.