Fortescue has proven that its large-scale industrial network can remain fully operational on renewable energy alone, even amid major weather disruptions.
The mining giant said intense bushfires caused major transmission disruptions, causing both circuits of a primary overhead transmission line to trip simultaneously.
The fault instantly severed the network’s connection to all thermal generation, a scenario that historically would have resulted in a total blackout.
Instead, the company’s Green Grid, an integrated system of solar arrays and battery energy storage systems (BESS), responded within milliseconds. The renewable infrastructure maintained grid stability and continued to supply approximately 85MW of load across the network without a second of downtime.
Glen Carruthers, Fortescue’s Manager of Operations and Engineering, described the event as a career-defining moment that challenged 35 years of professional convention.
“For most of my 35-year career in power system engineering, I thought this was impossible,” he said.
“It is a glimpse of the future and, bar the birth of my child, the most exciting thing I have ever witnessed.”
The success of the Green Grid hinges on advanced inverter-based technologies and artificial intelligence. These systems now perform critical support functions, such as frequency control and voltage regulation, that were previously thought to be the sole domain of massive, fossil fuel-powered turbines.
Fortescue is now scaling this technology. With massive battery installations currently being commissioned at North Star Junction and Eliwana, the company is targeting 1.5GW of solar, 800MW of wind, and 5GWh of battery storage.
Fortescue also plans to use AI in its Green Grid. It is already deploying market-leading AI and digital optimisation systems that support real-time weather forecasting and grid responsiveness to changes in renewable generation.
The event serves as a real-world proof of concept for heavy industry globally. By demonstrating that green energy can withstand extreme disruptions, Fortescue has removed one of the final arguments for maintaining fossil fuel baseload in industrial mining operations, proving that decarbonisation does not have to come at the expense of reliability.