10 cents for a megawatt of electricity is an unheard of marginal cost in any situation.
your local costs in the US range from 5-25 cents per kilowatt hour (1/1000 of that), with ideal solar being the cheapest amortized at roughly 3 cents/kwh
I just cross-checked the source and the claim by one of their members of parliament was the price was 0.25CZK/MWh which is ~0.01EUR/MWh in fact.
Re:Day ahead electricity prices for EU
by ravel-bar-foo on Saturday August 27, 2022 @10:26AM
(#32619369)
This suggests that either the MP is incorrect, or they were misquoted, or some sort of accounting shenanigans are going on (infrastructure costs already paid for, etc.)
EDIT: Just found out production costs from another source:
Dukovany Nuclear Power Plant - 20.31EUR/MWh
Temelin Nuclear Power Plant - 34.52EUR/MWh