Wind helps supplement a lot most of the time. But there are times when there's no sun and no wind. For that, there's currently hydro, nuclear, and eventually batteries.
Well the economic part is solved by solar/wind/batteries being much cheaper than all the other options, that's why this model overprovisions wind and solar.
So yes, lots of solar might make it more cost effective to add some wind and/or batteries and vice versa but that's a good thing and what this model explores.
Wind is great, and has been cheaper. Solar is overtaking though.
One key point is that solar is very predictable and pairs well with lithium ion batteries that cycle daily to meet demand for most of the globe that doesnt have dark winters.
No one's suggesting 100% wind or solar but we can still improve the system with more. Plus both are incredibly quick to build compared to nuclear and fossil fuels, so if you're a country dependant on those (like the UK) it's one of the best ways to quickly improve your energy security.
the efficiency of photovoltaics and wind is only relevant here if you're powering them from stored energy, such as white-hot graphite blocks, rather than from the sun. or in the far future when human energy consumption has grown by two orders of magnitude
gas turbines are only 'renewables-only' if you make the gas from renewable energy
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