When? I can't think of any examples of forced rural-urban migration other than the Highland Clearances in the UK, which isn't really comparable.
Pol pot did it in Cambodia
That was urban-rural migration.
Rural people need reliable access to power for farming.
We can just make them pay for it instead of mooching off everybody else.
Exactly. People in this thread are perfectly happy to throw unknown heaps of other people's money at the problem until it is solved. And it's not like the government has a track record of efficiently spending money in the first place.