Ameren Illinois said it is constructing a new Stilleys transmission substation and upgrading the adjacent Crab Orchard distribution substation in Crab Orchard to improve electric service reliability and load capacity for customers in Williamson County and across southern Illinois. The company said the Stilleys substation will step down high-voltage electricity for transport to nearby distribution substations and is intended to support expected growth in regional energy demand and economic development. Ameren Illinois said the Crab Orchard upgrade includes replacing a transformer and other equipment and adding a new power line from the Stilleys substation, increasing capacity and flexibility. The Stilleys substation is expected to be completed and in service by May 2026.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Ameren Illinois Co. published the original content used to generate this news brief on March 03, 2026, and is solely responsible for the information contained therein.