System costs escalate with increasing proportion of variable renewables. Back-up generating capacity is required due to the intermittent nature of solar and wind.Utilising electricity from solar and wind in a grid becomes problematical at high levels for complex but now well-demonstrated reasons.Harnessing these for electricity depends on the cost and efficiency of the technology, which is constantly improving, thus reducing costs per peak kilowatt, and per kWh at the source.
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