Year round renewable energy?

[Scythe13]

Everyone knows about solar and wind power. Solar will be great in the summer and not so great in the winter. Not anything magical about that, there is more daylight hours in summer than winter, so enough said there. Wind will be a very hit and miss power source.

I'm entertaining the ideas of alternative power sources, that can be employed.

I've thought about waterwheels, and ways to harness rainwater (for people like myself whom don't have a stream running through the garden) for power production.

I just thought I'd pop the question out there to see what other ideas everyone else was playing with.

How do you plan to go off grid and have power, year round, if you had to go off grid?