From your link: "This assessment, however, does not take into account issues such as dispatch characteristics, capacity factors, fuel and other costs needed to compare generation technologies"
Poor capacity factor techs are inappropriate for baseload. Think of the small example: one windmill on your house. That's obviously not appropriate because the wind will stop blowing (and you can't store energy). You have to pair the windmill with a baseload generator that has the capability to run your whole house, but you can turn it off when the wind is blowing. Baseload with quick on/off: hydro, nat gas. Your property may not have geography for a dam, so you run the gas generator when the wind stops---not too bad.
The windmill only saves you gas, not a gas plant. Full redundancy is required, which isn't cheap. It is dishonest to talk about solar or wind without considering capacity factor (until an energy storage system is invented).