Start with Youtube, in particular people who describe how to actually build various energy related technologies from wholesale materials. For example Robert Mur

Start with Youtube, in particular people who describe how to actually build various energy related technologies from wholesale materials. For example Robert Murray-Smith. I would stay away from tech analysis types who just overhype a particular "cool" technology. Beyond that is extremely costly (capital, labour, time etc). You could look at solar farms or low profile wind energy installs though (e.g. look at improving the wind-type TENGs).