The rafters of the yuge building might have been built up with years of dry dusty Texas cow poop. Major SNAFU causes ignition. Not quite an explosion but it went up in a flash. Dust explodes with low humidity and the right conditions also.
Could be that too. The video I saw indicates many tons of fuel was available for combustion. Methane gas and poop dust would be substantial reservoir of explosive fuel. A frickin bio-FAE.
The facility is a year old.