As solar —> electric; Wind —> electric; Hybrid diesel electric appear to be the most practical systems: we find other great ideas sidelined, perhaps. This thread is to keep those experimental; possibly emerging technologies alive.
Here's one. The title may be grandiose? Certainly interesting; hope the URL makes it.
View topic - I have a dream...power cars/boats with compressed air! : Cruisers Forum : Latitudes & Attitudes Magazine
Keeping the system in mind is vital.
Trapping and directing the energy; storing it; using it when needed; maintaining the system and getting parts that break or making them by hand anchored somewhere remote and otherwise peaceful...