Considerable concern must arise from the obvious limitations on all wind turbines and wave harvesting mechanisms.Particularly their susceptability to the vagaries of the weather however efficient the technology of turbine design, 100% is as nothing if there is no wind at all.
As the percentage of the grid supplied by turbines increases, the more pressure there is to build conventional back-up power stations and the notion of reducing the CO2 footprint will get lost when they come into play; the hitherto unannounced costs for such back-up is a further issue. Conventional battery technology is still too costly and underdevoped to be considered as a storage mechanism.
Hydro-electricity (ie waterhead storage) has been around for over a century and now accounts for about 35% of global electricity production.
It still offers the crux of a solution to rationalizing renewable energies. Of course it requires an ocean of water and that is precisely where the waterhead will be placed.
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