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Don't get me wrong, I very much support renewables. I just don't see how renewables could supply our entire energy demand without sufficient energy storage capacity. That's why I think a hybrid solution that includes nuclear power plants is the way to go.
If you think that, let's say Germany, could generate all its electricity demand from renewables, then I'd recommend you to take a look at the following book (free): www.withouthotair.com/
The complex design of a Stellerator's magnectic coils essentially avoid the need for a transformer as it is being used in a Tokamak. The transformer is the reason why a Tokamak can only be operated in pulsed mode. However, there is ongoing research to achieve continuous operations e.g. by means of high-frequency waves.
Much better explanation here: https://www.ipp.mpg.de/14869/tokamak