From: https://www.statista.com/statistics/280704/world-power-consumption
Clearly the need for electricity will continue to grow due to more and more electrical power needed for electric vehicles, air- and ground-source heating, making green Hydrogen and other purposes where coal and gas are used at present.
Quantity of Buzz Hydros Needed
This was to get an idea of what was necessary in the World and an aim for my idea of very small local hydro-electric generation.
Buzz Hydro --------- The Future of Hydro-Electricity 