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Australia struggling with oversupply of solar power
(www.abc.net.au)
This is a most excellent place for technology news and articles.
I doubt that would be terribly relevant. The lions share of the surplus energy should be predictable based on recent grid data + 24 hour weather forecasts.
Based on nothing but wikipedia the primary methods for desalination are distillation (boiling) and membrane; neither of which sound like ramp up time would matter.
Yeah, if time to come online and time to go offline doesn't matter, then that definitely works.