Tim Day, who runs the mining giant’s West Australian iron ore portfolio, said the electrification of its massive trucks was a particularly complicated exercise.

Exclusive: Mining giant says technology is not yet advanced enough to run a fully electrified fleet but experts say it is hooked on federal fuel tax credits

The mining giant's delay in the rollout of renewable energy and a fleet of electric trucks and trains in the Pilbara has raised doubts inside the company about it meeting its…