Methinks what they are saying about wind is like idling your engine on a Prius while driving on batteries then conecting the gas engine when the batteries are dead .
Idling any carbon fired station is a waste , it still has to have steam up ready for the off while the generators are stopped , ya can't just turn on a boiler , it needs time to warm up , from 6 to 24 hours or they get thermal cracks and blow up .
I thought NG plants used direct gas turbines rather than boilers to send steam through the turbines, upon reading, it seems that's only for peaking plants. But the problems still come back to mass energy/heat storage for wind/solar. This is not insoluble, there a solar electric plant in the SW using molten salt to store solar heat for night generation. Even pumping water uphill is an old technology that can still make sense of the energy is otherwise wasted, such as feathering the wind turbines.