Ameren Transmission Company of Illinois (ATXI), a wholly owned subsidiary of Ameren Corporation, has completed and energised the final span of the Illinois Rivers Project, a 375-mile, 345,000-volt transmission line from Palmyra, Missouri, to Sugar Creek, Indiana, USA.
The Illinois Rivers Project was approved in 2011 by the Midcontinent Independent System Operator Inc. (MISO), a regional transmission organisation. The project is part of a coordinated, multi-state group of transmission projects – known as Multi-Value Projects – being developed by transmission owners in the Midwest to improve and strengthen the regional energy grid and to facilitate the integration of renewable energy. The final span of the Illinois Rivers Project was placed into service in late December 2020. The project is ATXI's third completed Multi-Value Project. Other ATXI Multi-Value Projects include the Spoon River Project in Illinois, which was completed in February 2018, and the Mark Twain Transmission Project, which went into service in Northeast Missouri in December 2019.