It's worth a look at the forecast economics of these PHES projects. The Cultana project is considered to offer a return of 8-12% p.a. on $477m of capital expenditures but has a similar storage capability to HGO. If that is correct then the HGO PHES would offer a very attractive return to an investor and leave room for a very meaningful payout or royalty stream to HGO.
Hillgrove 2019, page-5
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