I agree, but I think you can't demand-response away all of winter. People still want to drive their EVs and heat their homes and industrial processes can't be time shifted for weeks or even months.

You'll need some storage. Right now that would probably be Hydrogen or Methane, and making those is pretty expensive. Perhaps something better will come along, or it gets cheaper with scale, but at the current CO2 price it's not competitive with fossil fuels.