I think I tend to fall into a bucket of "dam owners do hydro WTF" when in fact the dam operator/owner is an energy company and they do energy.

There is a western analogue to this 3 Gorges move: Snowy Hydro which is trumpeting a pumped hydro model (its rapidly going cost +++ and is looking increasingly like being late, and possibly irrelevant against battery tech, but we'll see) also invests in wind and solar. Because.. power companies do power.

I kind-of wonder where the CSP land comes from: the dam reduced land availability significantly, flooding the plain behind the dam wall. So presumably this is a strictly commercial (ok, its a planned economy: within the limits of state enterprise commercial) land acquisition, to build the CSP on, and their existing transmission infrastructure is part of the mix. Given that CSP has thermal mass, I also wonder if they are looking to park power somehow, which seems odd given they own a .. giant dam.