The man, who has not been identified, was on a pole working to restore power to the 3500 block of San Jose when he was electrocuted at 10:30 a.m. He was rushed to a hospital, where he was pronounced dead.
Ameren Missouri officials are cooperating with police during the investigation, according to St. Louis CBS-affiliate KMOV.
Ameren Missouri released the following statement late Thursday afternoon:
"It is with tremendous regret and deep sadness we report an Ameren Missouri co-worker sustained an electrical contact at 10:30 a.m. during storm restoration efforts. He was transported to the hospital; however, he did not survive. The Ameren family of employees offer heartfelt sympathy and support to the family and loved ones of our co-worker."
Ameren officials paused restoration work following the incident to conduct a safety stand-down, which provided workers the chance to process the incident before refocusing on their own work.
President and CEO Warner Baxter conveyed to employees that "it is hard to find the words to express one's sorrow and sympathy for our co-worker. When these tragic events take place, we can simply offer our heartfelt thoughts, support and prayers to the family."
"While it is difficult to continue, we must do so for each other and for our customers," Senior Vice President Michael Moehn said. "Words cannot express my personal sorrow for the family and friends of our co-worker and for our employees impacted by this loss, but we can find ways to support each other."
As of about 6:50 p.m. Thursday, the company had 1,171 people working on power restoration, including 632 Ameren Missouri and Ameren Illinois line employees, 167 line contractors and 228 forestry crews.
"We continue to make good progress and expect to have the majority of customers restored this evening," Moehn said. "There will be restoration work that will extend into tomorrow in some of the most heavily damaged areas."
Call 9-1-1 or Ameren Missouri at 1-800-552-7583 if you see low-hanging or downed lines, and assume all downed power lines are energized.