Solar and wind need a fully operational back up.
They are intermittent
There are things like clouds and night time
The wind is suitable about 40% of the time.
There is no way of telling if you will have wind or solar on December 25 at noon.
So you need back up.
This is one reason the 'free' solar and wind are so expensive.
Solar and wind need a fully operational back up.They are...
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