Can you build out enough capacity that the lowest wind conditions during nighttime in winter don't cause outages? I worry about distribution as the answer due to the vulnerability of our existing power distribution infrastructure. Do we have answers for that yet? We need them in any case I suppose unless you build out local storage to such an extent that you don't need any grid at all even in the coldest winter or hottest summer.
You can back up the entire grid with combustion turbines burning hydrogen or some other e-fuel. A simple cycle combustion turbine power plant costs $500/kW, 20x cheaper than a nuclear plant ($10,000/kW).
