Combined cycle turbines do have a steam component (that's where the word "combined" comes from). The waste heat from the combustion turbine front end is used to make steam in the back end.
replyCombined cycle turbines are not primarily powered by steam. It is a secondary consequence of their operation. This contrasts with nuclear and coal plants where steam is the prime mover.
replyThat's what they said, though
replyThe steam part of CC systems shows hours and hours aren't inherently needed to get a steam power plant in operation. For that matter, warships with steam propulsion show the same thing, I believe.
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