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Studies and Reports > 2009 MN Biennial Report > NE Planning Zone > Needs: 6.3.19 Staples - Motley - Long Prairie Area

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Transmission Projects Report 2009
Section 6.3: Northeast Zone
 
p. 123

6.3.19 Staples – Motley – Long Prairie Area

Tracking Number: 2009-NE-N6

Utility: Great River Energy

Inadequacy: The GRE member cooperative substations served from the 34.5 kV system between the Dog Lake, Baxter, Verndale, Long Prairie, and Pepin Lake sources have experienced considerable load growth over the past several years. Combined with long, radial lines feeding these substations, this growth is expected to present some low voltage situations during a number of area transmission outages. One of the most severe outages is loss of the new Pepin Lake 115/34.5 kV source as this outage requires significant reconfiguration of the 34.5 kV system to reestablish service. Additionally, Crow Wing Power is requesting interconnection of a new Shamineau Lake Substation around 2015 that will require roughly five miles of transmission to connect to the system.

A map of the area is shown on the following page.

Alternatives. Alternatives include providing looped transmission service through 115 kV conversions or providing a new source into the 34.5 kV system. Distributed generation may also be an option. The connection for the Shamineau Lake substation will likely be constructed at 115 kV design standards for future conversion considerations.

Analysis. 115 kV conversion of the GRE loads would allow for continued load growth of these substations and would help to offload the 34.5 kV system while extending its useful life. Providing a new source into the 34.5 kV system may offer the system long-term voltage support provided it can reduce the radial distance of some of the substations. However, depending on the load growth, a new source may only delay the need for 115 kV conversions. Distributed generation may be attractive at the ends of the radial lines so long as there is sufficient capacity on the 34.5 kV system to handle excess generation.

Schedule. GRE will have to monitor load growth in the area to see when a solution is required. Current estimates suggest that a solution will need to be in place in the 2014-2016 timeframe. GRE will also continue to work with Crow Wing Power to determine when the Shamineau Lake Substation will be needed.

  


Transmission Projects Report 2009
Section 6.3: Northeast Zone
 
p. 124

Click here or on map below to download high resolution PDF map.