An explosion on Wednesday destroyed a building at Northrop Grumman’s rocket testing complex in northern Utah.
According to Air & Space Forces Magazine, Northrop Grumman’s Innovation Systems plant in Promontory, Utah, is where the company manufacturers “solid rocket motors for government and commercial customers.”
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April 16 explosion destroyed bldg at Northrop Grumman’s Innovation Systems plant in Promontory, Utah, where it makes solid rocket motors.
Northrop’s Innovation Systems—accounts for nearly 90% of the SRM capacity in the US, supporting Air Force, NASA, and commercial space launch… pic.twitter.com/Ooh0C6lkbH
— Olga Nesterova (@onestpress) April 17, 2025
Per Air & Space Forces Magazine:
There was no immediate report of casualties, which occurred at 7:35 am local time. Local officials said they are investigating the accident.
Northrop officials say the accident will not delay any of its programs. The Air Force referred inquiries to Northrop.
ADVERTISEMENTA Northrop spokesman would not characterize the function of the building, and whether it was involved in production of solid rocket motors, or SRMs. Industry sources later told Air & Space Forces Magazine the building was used in part to store materials used to make solid rocket motors.
Northrop’s Innovation Systems—formerly Orbital ATK—accounts for nearly 90 percent of the SRM capacity in the U.S., a capability that supports Air Force, NASA, and commercial space launch activities.
A local television station flew a helicopter over the building, showing no active fire but major wreckage.
Explosion completely destroys a Northrop Grumman building responsible for testing of solid fuel rockets.
Northrop Grummans “Rocket Ranch” has been expanding production, constructing new buildings and modifying old ones to scale up by 2030. pic.twitter.com/auT64hbCuR
— ayden (@squatsons) April 17, 2025
Utah Gov. Spencer Cox said Thursday he was told “there’s no danger to the public.”
Governor Spencer Cox said Thursday he's been told "there's no danger to the public" from the Northrop Grumman explosion, and that "so far" he's satisfied with transparency surrounding the blast. https://t.co/Qmn6ntc620
— KUTV2news (@KUTV2News) April 17, 2025
From KSL News:
An explosion rocked the Northrop Grumman rocket testing facility in remote Promontory, around 32 miles west of Brigham City.
Reports of the explosion came in around 7:38 AM, according to the Box Elder County Sheriff’s Office.
Palmer said the building is a total loss and was on fire Wednesday morning, but no injuries were reported, said Box Elder County Chief Sheriff’s Deputy Cade Palmer. Crews were dispatched to the location, where more information will be gathered.
The location, part of the “Rocket Ranch,” has been a testing ground for solid rocket motors in recent years, according to the company. Northrop Grumman has been expanding motor production, constructing new buildings and modifying old ones to scale up by 2030, a past press release says.
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