not tier 1 bhp, page-4

"With Olympic Dam set to consume about half of SA's current electricity generation, I wonder if SAu is a potential takeover target for either BHP or future OZL, or indeed a future joint infrastructure project."

SAU may not have it all on their own. I believe Green Rock Energy have leases in the best areas close to Olympic Dam and are making progress with their plans there.

I doubt that BHP have any plans for OZL. If they had plans they would have acted before this.