High efficiency is not always compatible with the flexibility required of a combined cycle plant when it must provide grid support for renewable generation integration. Such support involves more frequent start-ups and shut-downs than when operating in base or conventional intermediate load duty cycle. In addition, the plant often is required to operate at part load and must be able to ramp up and down frequently and rapidly. These situations usually will decrease a plant’s efficiency and increase its emissions. In addition, it exposes plant components to greater thermal and mechanical stress.

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