[timwilky]

My personal thoughts on all of this, bearing in mind I have spent the last 35 years associated with the power industry, mainly nasty coal and nuclear fueled power plants.

Tidal power, unlike wind, tides are predicatable and can be calculated for at least the next 500 years. turbine farms off the UK where we have the right locations to enhance tide velocities. Battery farms will enable stored power from renewables. But my preferred would be to use excess renewables for the generation of hydrogen,
Use the hyrdogen as a clean fuel, local heat/power using fuel cells etc.

Fill the sahara with solar farms to generate huge amounts of the above hydrogen. we can power clean engines with it. at worse there are now hydrogen gas turbines for power generation