We have been told that intermittent electricity from wind and solar, perhaps along with hydroelectricity, can be the basis of a green economy. Things are increasingly not working out as planned, however. Natural gas or coal used for balancing the intermittent output of renewables is increasingly high-priced or not available. It is becoming clear that modelers who encouraged the view that a smooth transition to wind, solar, and hydroelectric is possible have missed some important points.
Let’s look at some of the issues:
 It is becoming clear that intermittent wind and solar cannot be counted on to provide adequate electricity supply when the electrical distribution system needs them.
Early modelers did not expect that the variability of wind and solar would be a huge problem. They seemed to believe that, with the use of enough intermittent renewables, their variability would cancel out. Alternatively, long transmission lines would allow enough transfer of electricity between locations to largely offset variability.
In practice, variability is still a major problem. For example, in the third quarter of 2021, weak winds were a significant contributor to Europe’s power crunch. Europe’s largest wind producers (Britain, Germany and France) produced only 14% of installed capacity during this period, compared with an average of 20% to 26% in previous years. No one had planned for this kind of three-month shortfall.
In 2021, China experienced dry, windless weather so that both its wind and hydroelectric power were low. The country found it needed to use rolling blackouts to deal with the situation. This led to traffic lights failing and many families needing to eat candle-lit dinners.
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