Bowen was at one time the largest coal powerplant in the U.S. and maybe the world.
I worked there for a quarter as a co-op engineering student ~35 years ago, and am somewhat familiar with the plant layout and equipment as a result. There are large natural draft hyperbolic cooling towers, but there is very little inside them, nothing likely to create holes if it failed.
If one of the main steam turbines failed catastrophically, the hole(s) would be in the turbine house structure, which is the long low part of the main powerplant structure. The high part houses the steam generators, AKA “the boilers”.
I will now read the thread to see what else we’ve learned about this story beyond the OP.
They mixed air and H2 during a generator purge and it blew up.