Mostly yes, but it works the other direction as well: a fossil power station may not want to completely shut down because it expects more demand later in the day, and offer a few hours of low cost electricity to stay in the merit order.

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Maxion 5 hours ago | parent [-]

A lot of fossil power stations cant shut down for a few hours, they have to keep themselves on.

	▲	Gigachad 4 hours ago \| parent [-]
		Coal mostly. This is why coal is largely being phased out for natural gas which can cycle on and off as needed.