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MISO Northwest Exploratory Study

MISO Northwest Exploratory Study. Presented to National Wind Coordinating Committee Participants in study – MISO, Various utilities in Minnesota, North and South Dakota, Various wind and coal advocates through the UGPTC. Study scope.

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MISO Northwest Exploratory Study

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  1. MISONorthwest Exploratory Study Presented to National Wind Coordinating Committee Participants in study – MISO, Various utilities in Minnesota, North and South Dakota, Various wind and coal advocates through the UGPTC.

  2. Study scope • Identify the benefits of the best single line and two line transmission expansion given a projected 2000 MW wind and coal generation expansion in North Dakota and South Dakota marketed to the Twin Cities.

  3. Assumed Generation Sites • 500 MW coal plant in western North Dakota • 250 MW wind in northern North Dakota • 500 MW of wind in south central North Dakota • 250 MW of wind in central South Dakota • 500 MW of wind in southeast South Dakota and southwest Minnesota. • - This amount is beyond the 825 MW level • Total of 2000 MW’s under investigation

  4. Assumed Generation Sites

  5. Transmission Options Considered • Minnesota only: • New or single line conversion • North Dakota, South Dakota, and Minnesota combined: • Cross system 345 kV single line • Cross system 500 kV single line • Cross system 345 kV two line • Cross system 500 kV two line

  6. Minnesota only single line options • Convert North MN 230 kV line to 345 kV • Convert Watertown-Granite Falls-Blue Lake to 345 kV • Convert Fargo-Granite Falls-Blue Lake 230 kV line to 345 kV • Build new Fargo-St.Cloud 345 kV line (North Line) • Build new Watertown-Blue Lake 345 kV line (South Line)

  7. Minnesota only single line options # 1 # 4 # 3 # 2 & #5

  8. Cross System 345 kV Single Line options • New Antelope Valley-Jamestown-Maple River-Alexandria-Benton Co 345 kV line (North Line) • New Antelope Valley-Jamestown-Maple River and convert north MN 230 kV line to 345 kV • New Hettinger-Ellendale-Watertown and convert Watertown-Granite Falls-Blue Lake to 345 kV • New Hettinger-Ellendale-Watertown-Granite Falls-Blue Lake to 345 kV(south line) • New Hettinger-Ellendale-Watertown and Maple River-Alexandria-Benton Co 345 kV lines

  9. Cross System 345 kV single line options # 2 # 3 # 1 # 5 # 5 # 4

  10. Cross System 500 kV Single Line options • New Antelope Valley-Jamestown-Maple River-Alexandria-Benton Co 345 kV line (North Line) • Convert Antelope Valley-Huron- Watertown-Granite Falls-Blue Lake to 345 kV • New Hettinger-Ellendale-Watertown-Granite Falls-Blue Lake to 345 kV(South Line)

  11. Cross System 500 kV single line options # 1 # 3 # 2

  12. Cross System Two Line Options (345 and 500 kV) • New Antelope Valley-Jamestown-Maple River-Alexandria-Benton Co and New Hettinger-Ellendale-Watertown-Granite Falls-Blue Lake to 345 kV lines • New Antelope Valley-Jamestown-Maple River-Alexandria-Benton Co and New Hettinger-Ellendale-Watertown-Granite Falls-Blue Lake to 345 kV lines • New Antelope Valley-Jamestown-Maple River-Alexandria-Benton Co and Convert Antelope Valley-Huron-Watertown with New Watertown-Blue Lake 500 kV

  13. Cross System Two Line Options (345 kV and 500 kV) # 3 # 1 # 2 # 1 # 3 # 2

  14. General Conclusions • Line conversions didn’t add much capability • A single circuit cross system addition at 345 kV should add around 800 MW of new transfer capability. • A single 500 kV cross system line will not add a significant amount of additional capability above that of a 345 kV line • the underlying system can’t support the increased flows. • A two line 345 or 500 kV cross system plan should be sufficient to add around 2000 MW of new thermal capability.

  15. General Conclusions • More analysis needs to be done to incorporate the Belfield area coal plant and the Ellendale wind farm into the bulk system. • Local Interconnection Issues • To get two 500 kV lines to work better than 345 kV, there may need to be one or two North/South 500 kV ties between them to get them to unload the underlying system.

  16. Concept Recommendations • The following are not recommendations of specific projects but rather concepts of region to region transmission additions • Actual projects will depend on many factors such as: • Available routing corridors • Actual location, size, and schedule of Generation development • Coordination with other Transmission plans and needs (Ex.CaPX) • Other

  17. Recommended Transmission Concept Plan

  18. Next Steps • Finalize study with steering committee • Investigate potential route corridors • Draft addendum report for Midwest ISO Transmission Expansion Plan. • Coordinate these next steps with the CapX study and process • Begin process of establishing detailed plans. • Evaluate MISO queue, timing, utility resource plans, etc. • Review stability analysis, flowgate impacts, economics, etc.

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