I do agree with you about the importance of storing the energy produced by renewables and that is where things are heading. On this project, I just don't see the solar projects generating 'surplus' energy. And when you think about it, it doesn't make financial sense to store it in the hydro- when they are generating the solar, that is typically when the price is the highest. If that price isn't enticing, storing it in the hydro means energy losses in pump inefficiency and energy losses in the generators. So the price already has to be higher than they could have got in the first place to account for the energy losses. There will of course be times when it's like 45degrees and the price is $15,000/MWh or whatever, but those events are rare so you wouldn't have those events being the primary revenue drivers in the business model, but rather 'bonuses'
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