Prairie State – Gateway Line is a 345kV overhead line with a length of 69.20km from Prairie, Illinois, US, to Gateway, Illinois, US.

The project, which is currently under construction, is expected to be commissioned in 2021.


Prairie State – Gateway Line is an overhead line that will be operated by Ameren Illinois. The line will carry alternating current (AC) through single circuit cable.

Approximately $56.1m was financed by the authorities to undertake the construction works of the project.

The development of the Prairie State – Gateway Line project has been approved by the Illinois Commerce Commission.

Prairie State – Gateway Line project development status

The construction works on the Prairie State – Gateway Line project were commenced in 2020 and commissioning is expected in 2021.

About Ameren Illinois

Ameren Illinois Co (Ameren Illinois), a subsidiary of Ameren Corp is engaged in regulated electric and gas distribution related activities to various users residing in central and southern Illinois regions. The company is headquartered in Illinois, the US.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.