The reasons why the Green New Deal won’t really work are fairly subtle. A person really has to look into the details to see what goes wrong. In this post, I try to explain at least a few of the issues involved.
 None of the new renewables can easily be relied upon to produce enough energy in winter.
The world’s energy needs vary, depending on location. In locations near the poles, there will be a significant need for light and heat during the winter months. Energy needs will be relatively more equal throughout the year near the equator.
Solar energy is particularly a problem in winter. In northern latitudes, if utilities want to use solar energy to provide electricity in winter, they will likely need to build several times the amount of solar generation capacity required for summer to have enough electricity available for winter.
Figure 1. US daily average solar production, based on data of the US Energy Information Administration.
Hydroelectric tends to be a spring-dominated resource. Its quantity tends to vary significantly from year to year, making it difficult to count on.
Figure 2. US daily average hydroelectric production, based on data of the US Energy Information Administration.
Another issue with hydroelectric is the fact that most suitable locations have already been developed. Even if additional hydroelectric might help with winter energy needs, adding more hydroelectric is often not an option.
Wind energy (Figure 3) comes closest to being suitable for matching the winter consumption needs of the economy. In at least some parts of the world, wind energy seems to continue at a reasonable level during winter.
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