Not arguing the earlier points or saying this is relevant - but - here in Kansas, kinda known for it's wind, it usually dies down around sunset. We do get wind at night sometimes but we get a lot more during the day.
Yes, it is well known that the sun shines during the day and the wind blows at night, so together they provide all the baseload we will ever need. Ignore the new coal plants, nothing to see there.
I think describing night time as a problem of transmission is technically correct, but probably not the issue here.