> "combined cycle natural gas plants can turn on and off very quickly"
Response/ramp times for CCGTs are not particularly quick. Typically they need 15 minutes notice to initial grid synchronisation, a further 60-80 minutes to reach full power output from a "warm" start, and up to several hours from a "cold" start. That's much better than coal-fired plants which need many hours of notice, but still likely to be too slow to respond to unexpected grid imbalances without additional support.
Natural gas "peaker" plants typically use less-efficient but faster responding OCGTs for that reason.
Response/ramp times for CCGTs are not particularly quick. Typically they need 15 minutes notice to initial grid synchronisation, a further 60-80 minutes to reach full power output from a "warm" start, and up to several hours from a "cold" start. That's much better than coal-fired plants which need many hours of notice, but still likely to be too slow to respond to unexpected grid imbalances without additional support.
Natural gas "peaker" plants typically use less-efficient but faster responding OCGTs for that reason.