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Studies and Reports > 2009 MN Biennial Report > SE Planning Zone > Needs: 6.7.10 Wind Generation Upgrades – Freeborn and Mower Counties

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Transmission Projects Report 2009
Section 6.7: Southeast Zone
p. 273

6.7.10 Wind Generation Upgrades – Freeborn and Mower Counties

Tracking Number. 2007-SE-N4

Utility. ITC Midwest

Inadequacy. Two wind generating facilities were interconnected to ITC Midwest’s transmission system at locations in Cerro Gordo and Worth Counties in Northern Iowa. The two Iowa projects, a 150 MW wind generating facility interconnecting in northern Cerro Gordo County and a 160 MW wind generating facility interconnecting in Worth County, have collectively been shown to overload 27 miles of the Lime Creek to Adams 161 kV line and the NIW-to Hayward 161 kV line. These overloads have been identified as injection related constraints by the Midwest ISO, and mitigation of the constraints is required prior to the projects being granted interconnection service under the MISO tariff.

A system map displaying the location of the interconnection projects and the overloaded line sections is provided for reference following the discussion.

Alternatives. The 160 MW wind generating facility has proposed connection to the Lime Creek- Adams 161kV line approximately 27 miles southwest of the Adams substation in Minnesota. The Adams to Lime Creek 161 kV line has been shown to overload from this project’s interconnection point to the Adams substation, a distance of about 27 miles, and reconstruction of the existing line from the interconnection point to Adams substation has been identified as the solution for the overload. The existing line will be removed and a new 440 MVA line will be constructed on the exiting right of way. Approximately 5.5 miles of this line reconstruction will take place in Minnesota.

Both projects impact the NIW-Hayward 161 kV line, and this line will also be removed, and a newly constructed 440 MVA line will be constructed on the existing right of way. Approximately 11 miles of this line reconstruction will occur in Minnesota. Reconstruction of existing lines was identified as the preferred solution for alleviating line overloads created by interconnection of the two proposed wind generation projects; no other alternatives were accepted.

Analysis. The aforementioned overloads were identified as part of the MISO Group 5 System Impact Study. The Group 5 Study evaluated the impact of 37 generator interconnection projects with a collective output of 2,857.9 MW of new generation intending to connect in Southern Minnesota, Iowa, and Southeast South Dakota. The Group 5 study identified many transmission constraints due to insufficient generation outlet. Reconstruction of existing lines on existing right of way was identified as the preferred solution for mitigating the constraints caused by the wind generation.

Schedule. Projects G540/G548 and G595 were interconnected to the ITC Midwest transmission system in 2008, and the projects are operating under restricted output until the line reconstruction is completed. It is estimated that reconstruction of the NIW to Hayward 161kV line will be completed by the end of the second quarter of 2010. Reconstruction of the 27 mile section of the Adams to Lime Creek line is expected to be complete by the end of 2009. A route permit from the PUC was not required for reconstruction of the lines because there was no change in voltage and no change in the rights-of-way.


Transmission Projects Report 2009
Section 6.7: Southeast Zone
p. 275

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