Sorry I've taken so long to reply. I'm new to social media. It's hard to spill electrons, but it's easy to just disconnect solar PV and let the panels sit there doing nothing. Wind turbines can feather their blades and stop turning. Hydro can just let water spill without going through the turbines.
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Disconnection of renewables source is not that straightforward.
Also, renewables can beat fossil sources on cost in many situations, but not by so much that they still win if you have to discard most of the power
Again: why do negative energy prices exist? Is it because no one had the sense to go out and disconnect the panels for a bit?