The message stated the incident occurred at the facility at 11:05 p.m. Sunday. An all clear was given just before midnight.
During the incident, flames, flaring, noise, sirens and smoke were noticeable, the alert stated.
The company later explained there were basically two incidents that occurred at the same time. A unit at the Cedar Bayou Plant initiated a pressure release, a routine measure to bring the unit to a safe state, according to a company spokesperson. Coincidentally, and within minutes, a ground flare on a different unit occurred. Both units were in close proximity, but the incidents were said to be unrelated.
ABC13 viewers as far north as Liberty wrote on social media they felt the ground shake.
No injuries were reported and the plant is operating normally, the spokesperson said.