People are finding out that:
Solar and wind are based upon the weather, and weather is random and an inherently unstable process.
Wind and solar doesn't scale up very well, which is the second dagger.
There are many theories in life which doesn't scale well. . they are not linear processes.
They both require land availability and near the consumption endpoint is cheapest, which is difficult to happen in the long developed world. Only a few places offer ideal year round weather for highly probable production, and the costs there are more significant than where the consumption point is.
For large scale production, even a high production day with partly cloudy causes lumpy production which is the antithesis of the stable production required for usage. So a secondary source will always be needed for balancing, as hoomans have not yet found a way to store electricity at the scale required for balancing the delivery.
The best way to use solar energy is to transfer the heat generated to a storage unit and use the heat during the times when needed, particularly in the winter during the night time cooler periods.
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