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What is the maximum annual capacity factor that can be expected of a CCGT plant? I see in US in 2015 the average was about 0.56, but can it be higher? I guess it needs some time for maintenance but I don't know how much. Any guidance on where I can get such information?

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It's on the link you provided. Look at the middle graph, titled "Distribution of annual capacity factors for natural gas combined-cycle plants (2005, 2015)" and look at the Y axis, ranging from 0-10% up to 90-100%. You can see that there were about 20 plants with a CF greater than 90% in 2015, and about 70 plants with a CF less than 10% that same year.

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