Go local. We do heat exchanger in sheet pile walls of harbors and canals (enough of those around). We have tech with water in discarded mines. We even did tests with gravity. Earth quake resistant houses with piezo (local 12V grid, everything is electronic anyway) and gravity. The pressure of the roof. Limitless imagination. Don't hold back! Ah, and there are already windmills without blades. They harvest vibrations and are placed in formation. Like a swarm birds or fish...