If you understand it so well, why do you seem to think that a duplicate grid is required for renewables to provide power?
I don't think he was claiming that a duplicate grid was necessary, only that relying on renewables can cause problems feeding power into the existing grid.
For example:
- It may be necessary to have backup gas generators on standby, should there be issues with wind/solar generation not producing enough (e.g. if its cloudy, or the wind isn't blowing.)
- On particularly sunny days, solar power fed INTO the grid from small solar panels can overload infrastructure. Extra work is needed to design the system to prevent that.
https://www.abc.net.au/news/2018-10-11/electricity-distributors-warn-excess-solar-could-damage-grid/10365622
This is the post I was referring to. Shows a lack of understanding as to how renewables can feed the grid.
'You need to build completely redundant capacity since you can't risk blackouts if renewable output goes to zero. This doubles the capital cost of renewables"
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