The thing is you can calculate when there will be short falls and you can amount to that perfectly.
We now know the weather pretty much 1 day before it happens. adjusting that 1% of course amounts to maintaining natural gas facilities but it's really not that big of a deal.
Using natural gas means climate change still progresses. Not to mention you'll be paying all of the overhead cost of maintaining natural gas plants, but only use them for a fraction of the time. So net cost per watt hour will be very high.
