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In a way SBB is partially powered by hydro powerplants that can't be used for anything else: SBB has its own 16.7Hz grid because this is the train supply frequency. It's powered partially by sbb's hydro plants, partially by frequency converters (mostly rotating ones) from the grid, and has some amount of pumped storage. Alas, this update is about power bought from the grid, so it's exactly as you're saying.
