Republic Transmission: Hiple to Helix (Indiana)
Commissioned through the regional transmission planning process, Republic Transmission will develop, build, and own a high-voltage transmission line in northern Indiana. The line will extend from the Hiple Substation in LaGrange County to the Indiana–Michigan border in Steuben County.
In 2023, Republic Transmission was selected by the Midcontinent Independent System Operator (MISO) to develop, construct, own, and operate the Indiana portion of Hiple to Helix, a new 345 kV electric transmission line connecting Indiana and Michigan. Republic Transmission will construct the portion of this transmission line from Northern Indiana Public Service Company’s (NIPSCO) existing Hiple Substation in LaGrange County to the Indiana-Michigan state border in Steuben County. The Michigan portion of the Hiple-to-Helix line is being developed by Michigan Electric Transmission Company (METC), extending from the state border to METC’s planned Helix Substation in Calhoun County, Michigan.
Project Updates:
Thank you for attending Republic Transmission’s open house meetings in Orland, Topeka and LaGrange on July 7–9, 2026,
We are now reviewing the feedback and information gathered to help refine potential route options.
Additional updates, including next steps in the routing process, will be posted here as they become available.
Questions? Contact us using the form below.
Project Facts
~35*
Miles of double-circuit 345 kV transmission line
$140 Million*
Capital to be invested
in Indiana’s power
infrastructure
Company Facts
$2.5+ Million
Property taxes paid by
Republic Transmission to Indiana
since 2019 to help fund essential
services in the state
100%
Average operating availability
achieved by Republic Transmission’s
facilities over the past 5 years to
help stabilize the power grid
A well-supported project implementation cost estimate, a superior revenue requirement commitment, and a well-reasoned routing strategy.
Community benefits:
Affordability
Cost to construct estimated to be more than 30% below MISO’s original estimate, on a cost per mile basis, ensuring affordability for consumers
Economic Development
Project will support local economic development in LaGrange and Steuben counties, from construction jobs to community donations and more
Reliability
Project commissioned by MISO to enhance grid reliability, efficiency, and prepare for future demand
Stability
Project will help improve the stability of the grid by adding new power infrastructure in Indiana
Project area map
Timeline:
Project resources:
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