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*power the 1500HP exciting generator.
It should be pointed out that synchronous West Texas wind turbines were the grids spinning inertia and phase angles source when the gas grid and turbines both cascaded into failure.
Those turbines and grid forming inverters are what saved the ERCOT grid from total collapse and months of outages during a black start event. Again the link to the report the legislature used to write laws to prevent it happening again is above. Note that solar and wind have grown by large amounts since the report and more new inverter are....Yeah grid forming inverters because they are a very useful back up and fail safe.
“... months of outages during a black start event.”
Why months?
I was living in Chicago during the Great Northeast Blackout of 1965. It didn’t take more than a couple of days to get most everything going again. One thing I remember is that they found a diesel generator somewhere in Mass. to provide enough power to restart a succession of bigger plants serving the area.
Also, Texas has long had a couple of hydro plants, and I presume they would still be running to provide frequency and phase information besides a modest amount of power for restart.