"You would need some flow but, having been in an alternative energy startup for five years, I can tell you that hydro is the best for power! Wind power is far more efficient than solar (at least with the current technology), but hydro has almost 1,000 times the potential energy of wind so a little can go a long way."
well said Craig-in the 70`s we lived in a valley with a small but reliable waterfall(approx 400ml per minute) and created a small rockpool dam with a 90mm outflow pipe which dropped vertically for 5m or so then into a 50mm pipe for 5m and finally down to a 5mm spray nozzle we directed onto the cups of a handmade brass Pelton Wheel(visually,a Ferris Wheel)which connected via a fan belt to a 12volt automotive generator and provided lights and radio for 3 households.
nowadays,as you know,the new teflon slider pumps work with minimal flow rates.
which brings us back to wave power-perpetual motion-that was supposed to be a no-brainer but i guess ,like solar and wind you cant dig it up or bottle it or really own it so there is no ongoing profit to be made so forget it.........
pardon my cynicsm
cheers