In fact, for brown coal fired plants I have visited this is 10%.For a 300 MW the auxilliary circuits need 30 MW.It's impossible to have a generator that size;there is a special transformer supplied from the 150 kV grid for startup.So, without 150 kV grid ->no startup.The generator itself supplies the 400 kV grid (21kV/400 kV transformer).There was a hydro plant however, that could be started with the 150 kV grid dead, by only a diesel generator (here is where your idea comes) to open the valves for water.It has 3 125 MW units;so is capable of supplying many brown coal plants at once.
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