Sioux Substation is a 345kV substation located in Sioux, Missouri, US.

The Sioux Substation project’s construction has begun in 2020. The works are expected to be commissioned in 2021.


Sioux Substation project, which is a new substation, will be operated by Ameren Missouri.

The designed voltage level of the substation is 345/138kV and the operating voltage level is 345/138kV.

The step-in voltage of the project is 345kV and the step-out voltage is 138kV.

Sioux Substation project development status

The development of the Sioux Substation project was approved by Missouri Public Service Commission in 2020. The project is expected to be commissioned in 2021. Approximately $5m was financed by the authorities to undertake the construction works of the project.

About Ameren Missouri

Ameren Missouri (Ameren Missouri) that designs and builds regional transmission projects. The company is headquartered in St. Louis, Missouri, United States.


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.