New Richmond Load Serving Study

Northern MAPP Subregional Planning GroupAugust 16, 2006

Daniel Kline

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Outline

Description of Area Various Load Serving Problems Study Methodology & Initial Alternatives Final Alternatives Considered Final Recommendation & Initial Project

Schedule Questions

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Description of Area

Located in Western Wisconsin St. Croix County Just across Minnesota border, near I-94

Area fed by 161 kV sources and 69 kV subtransmission

Load belonging to Xcel and DPC

Lines belonging toXcel and DPC

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Description of Area

Area Xcel Loads (2011): New Richmond (9.1 MW) Somerset (7.7 MW) Kinnickinnic (4.4 MW) Osceola (15.4 MW) River Falls (30 MW)

Area DPC Loads (2011): New Richmond (15 MW) Houlton (5.4 MW) Farmington (8.1 MW) Roberts (4.6 MW) Hammond (3.2 MW)

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Description of Area

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Description of Problems

Low voltage at New Richmond during outage of Pine Lake – New Richmond 69 kV line

Low voltage at Osceola during outage of Osceola – Osceola Tap 69 kV line

Overload of River Falls 115/69 kV transformer during outage of Osceola – Osceola Tap 69 kV line

Overload of Pine Lake 161/115 kV transformer during outage of King – Willow River 115 kV line

Normal Overload of Pine Lake – Rush River 69 kV line

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Description of Problems

High load growth throughout area Installation of Chisago Line Project will

require extended outage of Osceola – Osceola Tap 69 kV line

No room for expansion at New Richmond Substation

No room for expansion at Rush River Substation

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Study Methodology

2006 MAPP Series Cases 2011 Near-Term 2016 Out-Year

Study Group Asked to Review: Jerry Iverson, DPC Bob Roddy, DPC Dave Krause, KPE Jeff Haas, Xcel Walt Grivna, Xcel

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Study Methodology

Assumptions and Adjustments made Assumed Chisago Line Project not in service in

2011 (In-service in 2016) New City of New Richmond Substation in

service Xcel’s Somerset Substation in service Added DPC N-60 line upgrade (477 ACSR)

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Study Methodology

Base Case ResultsAffected Facility

Facility Rating

Facility Loading Contingency

River Falls 115/69 kV Transformer 70.0 103.6 System Intact

Pine Lake 161/115 kV Transformer 112.0 104.1 King to W illow River 115 kV Line

River Falls 115/69 kV Transformer 70.0 106.2 King to W illow River 115 kV Line

Apple River to Somerset 69 kV System 1.00 pu Low VoltageRiver Falls to South Fork 69 kV Line, Close Somerset to Farmington line

Apple River to Garfield 69 kV Line 25.0 120.6River Falls to South Fork 69 kV Line, Close Somerset to Farmington & W arren to Baldw in Tap

River Falls 115/69 kV Transformer 70.0 181.2Garfield to Sand Lake & St. Croix to Osceola Tap 69 kV Lines, Close Somerset to Farmington line

Kinnickinnic - Roberts - Baldw in Tap 69 kV Line 86.0 138.3Garfield to Sand Lake & St. Croix to Osceola Tap 69 kV Lines, Close Somerset to Farmington line

River Falls to Baldw in Tap 69 kV Line 84.0 170.6Garfield to Sand Lake & St. Croix to Osceola Tap 69 kV Lines, Close Somerset to Farmington line

Roberts to Farmington Tap 69 kV Line 86.0 122.7Garfield to Sand Lake & St. Croix to Osceola Tap 69 kV Lines, Close Somerset to Farmington line

River Falls 115/69 kV Transformer 70.0 148.3Osceola to Osceola Tap 69 kV Line, Close Somerset to Farmington line

River Falls to Troy 69 kV Line 84.0 123.5Osceola to Osceola Tap 69 kV Line, Close Somerset to Farmington line

River Falls to Glover Tap 69 kV Line 84.0 128.3 River Falls 115/69 kV Transformer

River Falls to Beldenville 69 kV Line 47.0 275.2 River Falls 115/69 kV Transformer

River Falls to South Fork 69 kV Line 84.0 116.6River Falls 115/69 kV Transformer, Turn on River Falls Generator

River Falls to Beldenville 69 kV Line 47.0 137.5River Falls 115/69 kV Transformer, Turn on River Falls Generator

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Study Methodology

Base Case Results

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Initial Ideas

Multi-Faceted Approach 5.4 MVAR Capacitor at Osceola 10.0 MVAR Capacitor at New Richmond New 69 kV switching station south of New Richmond that

would tap DPC N-60 line 115/69 kV Transformer near Kinnickinnic Substation 161/69 kV Transformer at Clear Lake Substation 69 kV line from Somerset to new substation north of New

Richmond 69 kV line from Cylon to new substation north of New

Richmond

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Initial Ideas

Options investigated with and without Chisago project

Necessity of Poplar Lake Substation and 161/69 kV transformer investigated

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Final Alternatives

Three options tagged for detailed review Alternative 1, Step 2A – Three Lakes 115/69 kV

Substation, Stanton 69 kV Substation, & Somerset to Stanton 69 kV Line

Alternative 1, Step 2B – Three Lakes 115/69 kV Substation, Stanton 69 kV Substation, & Cylon to Stanton 69 kV Line

Alternative 2, Step 1 – 115/69 kV Substation south of New Richmond

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Final Alternatives - 1

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Final Alternatives - 1** From bus ** ** To bus **

CKT ContMVA BaseFlow Rating Loading% Contingency

2011

I ndependence to Elk Creek 69 kV Line 25.8 25.8 25.0 103.4 * * Base Case * *

River Falls 115/69 kV Transformer 80.1 45.2 70.0 114.4 King to W illow River 115 kV Line

2016

I ndependence to Elk Creek 69 kV Line 25.9 25.9 25.0 103.8 * * Base Case * *

Osceola Tap to Border 69 kV Line 25.9 25.9 25.0 103.6 * * Base Case * *

Border to Sand Lake 69 kV Line 25.9 16.1 25.0 103.6Osceola to Osceola Tap 69 kV Line, Close Somerset to Farmington

Border to Sand Lake 69 kV Line 25.9 16.1 25.0 103.6St. Croix Tap to Osceola & Rice Tap to Roberts 69 kV Lines, Close Somerset to Farmington

Bus # Bus Name ContVolt BaseVolt Contin.Description

2011

68974 Buses Along DPC N-60 Line0.9248 0.9680 King to W illow River 115 kV Line

68962 Border 69 kV 0.9274 0.9786Crystal Cave to Pine Lake & Pine Lake to Apple River 161 kV Lines

68974 Houlton 69 kV 0.9430 0.9680Crystal Cave to Pine Lake & Pine Lake to Apple River 161 kV Lines

69011 Garfield 69 kV 0.9351 0.9860Crystal Cave to Pine Lake & Pine Lake to Apple River 161 kV Lines

69012 Sand Lake 69 kV 0.9282 0.9794Crystal Cave to Pine Lake & Pine Lake to Apple River 161 kV Lines

61041 Osceola 69 kV 0.9473 0.9749Three Lakes 115/69 kV Transformer

68783 Trap Rock 69 kV 0.9478 0.9755Three Lakes 115/69 kV Transformer

68974 Houlton 69 kV 0.9371 0.9680Three Lakes 115/69 kV Transformer

2016

No Violations

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Final Alternatives - 2

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Final Alternatives - 2** From bus ** ** To bus **

CKT ContMVA BaseFlow Rating Loading% Contingency

2011

I ndependence to Elk Creek 69 kV Line 25.8 25.8 25.0 103.2 * * Base Case * *

River Falls 115/69 kV Transformer 80.1 44.5 70.0 114.4 King to W illow River 115 kV Line

2016

Eau Claire 161/69 kV Transformer #2 118.3 118.3 112.0 105.6 * * Base Case * *

I ndependence to Elk Creek 69 kV Line 26.2 26.2 25.0 104.8 * * Base Case * *

Osceola Tap to Border 69 kV Line 37.6 24.8 25.0 150.3 King to W illow River 115 kV Line

Osceola Tap to Border 69 kV Line 31.3 24.8 25.0 125.1River Falls to South Fork 69 kV Line OR River Falls 115/69 kV Transformer

Osceola Tap to Border 69 kV Line 35.9 24.8 25.0 143.7 Three Lakes 115/69 kV Transformer

Bus # Bus Name ContVolt BaseVolt Contin.Description

2011

61041 Buses along DPC N-60 Line 0.9296 0.9738 King to W illow River 115 kV Line

68974 Houlton 69 kV 0.9394 0.9572

River Falls to South Fork 69 kV Line, Close Somerset to Farmington 69 kV Line

69012 Buses along DPC N-60 Line 0.8991 0.9772Garfield to Sand Lake 69 kV Line & St. Croix Falls to Osceola Tap 69 kV Line

68974 Houlton 69 kV 0.9447 0.9572 River Falls 115/69 kV Transformer

68974 Buses along DPC N-60 Line 0.9042 0.9572 Three Lakes 115/69 kV Transformer

2016

68974 Houlton 69 kV 0.9439 0.9825 King to W illow River 115 kV Line

68974 Houlton 69 kV 0.9446 0.9825 Three Lakes 115/69 kV Transformer

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Final Alternatives - 3

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Final Alternatives - 3** From bus ** ** To bus **

CKT ContMVA BaseFlow Rating Loading% Contingency

2011

I ndependence to Elk Creek 69 kV Line 25.5 25.5 25.0 102.1 * * Base Case * *

Pine Lake 161/115 kV Transformer 118.5 29.1 112.0 105.8

River Falls 115/69 kV Transformer 75.9 64.2 70.0 108.4

Pine Lake to New Richmond Sw itching Station Line 68.4 30.6 48.0 142.5

Apple River to Garfield 69 kV Line 29.6 20.6 25.0 118.5

River Falls 115/69 kV Transformer 74.0 64.2 70.0 105.7

Pine Lake to New Richmond Sw itching Station Line 48.4 30.6 48.0 100.8

Pine Lake to New Richmond Sw itching Station Line 56.8 30.6 48.0 118.3 River Falls 115/69 kV Transformer

River Falls 115/69 kV Transformer 70.9 64.2 70.0 101.3Osceola to Osceola Tap 69 kV Line, Close Somerset to Farmington

River Falls 115/69 kV Transformer 78.2 64.2 70.0 111.7Pine Lake to New Richmond Sw itching Station 115 kV Line

River Falls 115/69 kV Transformer 72.0 64.2 70.0 102.9 Crystal Cave to Apple River 161 kV Line

Apple River to Sand Lake 69 kV Line 68.0 20.6 25.0 272.2

Osceola to Sand Lake 69 kV Line 49.0 6.9 25.0 196.1

Houlton to Farmington Tap 69 kV Line 18.0 12.0 17.0 106.1

2016

Eau Claire 161/69 kV Transformer 118.6 118.6 112.0 105.9 * * Base Case * *

Independence to Elk Creek 69 kV Line 26.2 26.2 25.0 104.8 * * Base Case * *

Osceola Tap to Border 69 kV Line 30.3 30.3 25.0 121.2 * * Base Case * *

Eau Claire 161/69 kV Transformer 121.3 118.6 112.0 108.3

Pine Lake 161/115 kV Transformer 113.2 44.2 112.0 101.1

Pine Lake to W arren 69 kV Line 34.0 3.9 17.0 200.0 River Falls to South Fork 69 kV Line

Border to Sand Lake 69 kV Line 25.6 16.3 25.0 102.3 Osceola to Osceola Tap 69 kV Line

Garfield to Sand Lake & St. Croix Falls to Sand Lake 69 kV Lines, Close Somerset to Farmington

River Falls to South Fork 69 kV Line, Close Somerset to Farmington

King to W illow River 115 kV Line

King to W illow River 115 kV Line

New Richmond Sw itching Station to Houlton Tap 69 kV Line, Close Somerset to Farmington

Voltage Violations too numerous to mention

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Final Recommendation

Alternative 1 Recommended 10 MVAR Cap Bank at New Richmond – ASAP Three Lakes Substation – ASAP 5.4 MVAR Cap Bank at Osceola – May 31, 2009 Rebuild Osceola to Sand Lake 69 kV Line – May 31, 2009 Relocate Rush River Substation and cut over to 161 kV –

May 31, 2010 Construct Somerset Sub – May 31, 2010 Construct Stanton Sub – December 31, 2010 Construct Somerset to Stanton 69 kV Line – May 31, 2011 Complete installation of Chisago Line Project – May 31,

2011 Construct Poplar Lake Sub & 161/69 kV Transformer –

May 31, 2011

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Next Steps

Currently compiling necessary information for business case

Will have more meetings with Study Group prior to any filings