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Duff – Coleman Line is a 345kV overhead line with a length of 49.88km from Duff, Indiana, US, to Coleman, Kentucky, US.

Construction works on the Duff – Coleman Line started in 2019 and the project was commissioned in 2020.


The Duff – Coleman Line, which is an overhead line, is being operated by Midcontinent Independent System Operator. The Duff – Coleman Line is a new line. The line carries alternating current (AC) through single circuit cable.

Approximately $64.9m was financed by the authorities to undertake the construction works of the project.

Duff – Coleman Line project development status

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By GlobalData

The development of the Duff – Coleman Line project was approved by Indiana Utility Regulatory Commission in 2019 and the project works were completed in 2020.

About Midcontinent Independent System Operator

Midcontinent Independent System Operator Inc (MISO) formerly, Midwest Independent Transmission System Operator Inc is a provider of utility services. It is an independent and not-for-profit organization. The company transmits electricity to commercial, industrial and residential customers. MISO serves customers in the US and Canada. MISO is headquartered in Carmel, Indiana, 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.