This isn’t really true, hydroponics can be done outside and on windowsills using the Kratky method en masse and for very cheap. I have a small wind power setup that adds light near my windowsill. I live in an apartment and have a little spinny thing outside on the porch, the light is indirect for my potatoes so I really needed something extra and had no power outlets nearby. Micro wind setups suck for powering your whole house but are fantastic for powering low power draw lights in low light areas. I’m high up enough and the little spinny thing connects to a battery, seems to be enough to keep my potatoes happy despite the shade.

The best solution for farming in this situation is obviously to set up a bunch of light towers on nuclear, gas, and wind power but who knows how long itd take for people to catch on to that, sensible governments like China would certainly mobilize this sort of thing and ration energy for it. The massive temperature swings would definitely pick up a lot of wind.