MISO, a not-for-profit, member-based organization, ensures the most reliable and cost-effective delivery of electricity across more than 65,000 miles of high-voltage power lines in 15 U.S. states and the Canadian province of Manitoba. Each year, in its MISO Transmission Expansion Plan (MTEP), MISO evaluates regulatory policy and reliability issues, and initiates projects to relieve congestion and more efficiently deliver power to electricity consumers.

MISO has identified a need for this project due to significant transmission system congestion in the region. The project will allow lower cost generation to serve congested, large industrial loads and will increase system reliability by expanding the area’s 345-kV backbone and completing a high voltage loop started years ago.

After determining that the project was needed, MISO completed a competitive selection process to determine who would implement, own and operate the Duff-Coleman Project.  MISO examined proposals from eleven qualified developers including Republic Transmission and other national and local utility companies.  For each proposal MISO evaluated: 1) project cost and design; 2) project implementation capabilities; 3) operations and maintenance capabilities; and 4) planning participation.  In each category MISO looked for certainty, risk mitigation, low cost, and specificity.

MISO’s evaluation process determined that Republic Transmission was best suited to implement own and operate the Duff-Coleman Project.  In its Selection Report MISO said, “Republic Transmission was comparatively advantageous and exhibited the best balance of high-quality design and competitive cost, best-in-class project implementation, and top-tier plans for operations and maintenance. Republic Transmission excelled among a complement of strong proposals. Republic Transmission’s proposal provided the strongest combination of attributes, including but not limited to, the highest degree of certainty and specificity, the lowest risk, and low cost.”

Republic Transmission is regulated by the Federal Energy Regulatory Commission (FERC). Once the transmission line is in service, Republic Transmission will receive rate recovery of its prudently incurred expenses associated with the project. If Republic Transmission’s expenses are approved, all MISO consumers will share in the costs based on the benefits that they are receiving from the project.

Republic Transmission plans to use predominantly galvanized steel H-frame structures, and in some limited cases, steel 3-pole guyed monopole structures.

Vectren Corporation owns the Duff substation, and Big Rivers Electric Corporation owns the Coleman EHV substation. Both utilities are expanding these substations to accommodate the transmission line project.

No. Republic Transmission is an electric transmission company. We will operate one of the transmission lines that deliver power to your current retail electric provider, which will then distribute it to you.

Need more information about the Duff to Coleman Project? Contact us.

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