https://www.greencarcongress.com/2024/05/20240527-pilbara.html
from link it says "In 2021, Rio Tinto and BHP worked with both Caterpillar and Komatsu to support the development and validation of their prototype battery-electric haul trucks. The trucks included in these trials are based on these prototypes."
That's nice, thanks Hogey, that answers that question.