(KMOV) -- Emergency crews responded to a fire at the South County Ameren Missouri plant on Tuesday night.
Officials say the call came in around 8:30 for a small fire at Ameren's Meramec Power Plant located at 8200 Fine Rd.
A second alarm then went off a little before 9 p.m.
Brian Daniels with AmerenUE said a small fire sparked in the switch yard area but was quickly extinguished by Ameren employees before fire crews arrived.
The fire caused minimal damage to the facility.
No injuries were reported..
Several nearby residents called News 4 after reportedly hearing explosions or the sound of loud grinding. Ameren officials say this is consistent with the incident.
Police say the Mehlville Fire Department is handling the scene with assistance from St. Louis County and Rock Community Fire Protection.
Further details into what caused the fire were not immediately known.