Interconnection Studies

The Grain Belt Express Clean Line is an interregional transmission project that will traverse the footprints of three Regional Transmission Organizations (RTO) – the Southwest Power Pool (SPP), the Midcontinent Independent System Operator (MISO), and the PJM Interconnection (PJM).  Clean Line is working with SPP, MISO and PJM—which coordinate the movement of wholesale electricity across multiple states—to ensure that the Grain Belt Express Clean Line reliably interconnects with and delivers power to the grid.


Indiana is known as the “Crossroads of America” because several highways intersect in the state. Similarly, electric utilities in Indiana have built several extra high voltage transmission lines, making Indiana an attractive hub for the Grain Belt Express Clean Line to deliver 3,500 megawatts of abundant, affordable, renewable power. We are working with PJM to study interconnection at the 345/765-kilovolt (kV) substation in Sullivan County, Indiana. Below, please find a link to the most recent PJM study reports. Additional study reports will be posted as they become available.

Interconnection Feasibility Study Report – January 2013
Interconnection System Impact Study Report – October 2014


Many electricity consumers in Missouri and Illinois are served by MISO. We are studying interconnection with MISO to examine the impacts of delivering 500 megawatts of power into the existing 345 kilovolt (kV) system in northern Missouri. Below, please find a link to the most recent MISO study reports. Additional study reports will be posted as they become available.

MISO Interconnection Feasability Study Report – October 2012
MISO SPA System Impact Study Report – November 2014

MISO Optional Study Report – January 2017



The abundant wind resource area and the western end of the Grain Belt Express Clean Line are within the SPP region. Clean Line has worked closely with SPP, its Transmission Working Group (TWG), and other affected transmission owners since 2012 to conduct studies. In September 2013, the TWG approved Grain Belt Express Clean Line’s reliability studies, completed in accordance with SPP Criteria 3.5, which requires entities requesting transmission interconnections to work with the SPP, the TWG, and affected parties to ensure grid reliability. In March 2015, ITC Great Plains completed the Facility Study of Grain Belt Express’ interconnection facilities. Grain Belt Express will interconnect with the ITC Great Plains system in SPP. In October 2016, Grain Belt Express signed an Interconnection Agreement with SPP and ITC Great Plains, which was subsequently accepted by FERC in December 2016. 

Please see below to download completed studies and minutes from meetings we have had with affected parties.