Nuclear for cities as long as the plants aren't in a stupid place and it's not funded by the Chinese, owned by the french and so the electricity costs 3x as much, or something to that degree. Wind and solar for rural places, solar roofs like Tesla tiles, where the tiles are solar panels so look like a normal roof + a smart grid, where say your on holiday your solar panels are being wasted, so a smart grid lets other people use or buy that electricity.
One of the main things though, is making things more efficient, sustainable and not wasting as much, E.G. why recycle plastic cups which requires electricity, when you can just use a reusable bottle for years.