Duff Substation is a 345kV substation located in Duff, Indiana, US.

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


Duff Substation project, which is an upgrade substation, will be operated by Vectren.

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

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

Duff Substation project development status

The development of the Duff Substation project was approved by Indiana Utility Regulation Commission in 2020. The project is expected to be commissioned in 2021. Approximately $3.09m was financed by the authorities to undertake the construction works of the project.

About Vectren

Vectren Corp (Vectren), a subsidiary of CenterPoint Energy Inc, is an energy holding company, which carries out the distribution and transmission of natural gas and electricity. Under its wholly owned subsidiary, Vectren Utility Holdings, Inc., the company operates three utilities; Vectren Energy Delivery of Indiana – North (Vectren North), Vectren Energy Delivery of Indiana – South (Vectren South) and Vectren Energy Delivery of Ohio, Inc. (VEDO).


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.