Wisconsin Transmission Development plans

June 15th, 2010

This report contains transmission planning data that may be conceptual in nature and is subject to change. The transmission projects listed may

change scope or not be constructed

2

Propose

Introduce Wisconsin upcoming and potential transmission projects

Projects that may require CA or CPCNProjects new to the Commission Staff

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Drivers for the Transmission Developments

New load GrowthIndustrial Expansion

Transmission Facility ConditionNERC/FERC “Raising the Bar”Operability Performance

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State Map of Developments

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DiscussionNorthern Wisconsin

Park Falls Bio Refinery and Osprey – Park Falls RebuildStone Lake – Couderay and Couderay – OspreyStinson – BayfrontBayfield Peninsula LoopCopper Mine

Eau Claire regionCedar Falls – Clear Lake RebuildEau Claire Phase IIEau Claire Substation

La Crosse regionCoulee Transformer and Ring BusMarshland 161 kV Ring Bus

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Northern Wisconsin Map

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Northern Wisconsin Drivers of Development

Growth in industrial loadStimulus money projectsMining

System at it’s limitsInexpensive enhancements have been exhausted

Some Facilities reaching end of life

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Northern Wisconsin Industrial Loads

Pipeline Pumping Capacity Increase

Park Falls Area Bio-refinery

MI Copper Mine

Small Bio-Refinery and Cranberry load

-Industrial customers need stable voltages

- Potential represent a 30% load increase

Bayfront

Ironwood

Osprey

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Osprey – Park Falls and Bio-refinery Projects

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Discussion: Osprey – Park Falls and Bio-refinery Projects

Osprey- Park Falls conditionLine built in 1922Deteriorating condition

Bio-refineryDemand: 17+ MW with large motors in Park FallsCustomer has agreed to participate financially in permitting

Pilot plant has meet required efficiency levels$30 million in D.O.E. financing; still awaiting moreLate 2012 completion date

System ImprovementsRebuild the 115 kV line from Osprey to Park Falls30 month lead timeNew 115 kV line to customer from Park Falls sub and 115/13.8 kV sub for customer

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Bio Refinery System Improvements

Rebuild Late 2012

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Stone – Lake Couderay and Couderay – Osprey 161 kV

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Stone Lake – Couderay DiscussionConcern

Normal load growth in the area creating low voltage concerns during outages of the Stone Lake side of existing 69 kV lineOutage of Stone lake- Farmers Inn 161 kV loads the Stone Lake 161-69 kV transformer above acceptable limitsProposed Pipeline Pumping load expansion exacerbates problem

Plan: Final details being worked out 17 mile new 161 kV lineNew substation at east end due to space constraints at Couderay site Potential for double-circuit

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Northern Wisconsin Pumping load

Pipeline pumping load expansionChanges at a number of existing siteMajor increase in load proposed for Xcel Energy’s Sheldon Pump substationSchedule dependent on economic recoveryPresent expectation 2013-2016

ConcernLow Voltage at Hydro Plants and surrounding loads during outage of Hydro Lane End of 115 kV line

Plan: Utilize Stone Lake to bring new 161 kV source to Big Falls area

Provides new source into middle of eastern loopContinues development from Couderay

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Stone Lake – Couderay & Couderay – Osprey

Stone Lake – Couderay~2014

Couderay - Osprey~2015

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Stinson – Bayfront Rebuild

Stinson – Bayfront~2012

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Stinson – Bayfront Discussion

ConcernOlder line designed assuming winter peak loads and under old clearance standardSummer loadings may now exceed present clearance standards

Plan Rebuild the line to standard 115 kV construction and 795 ACSR conductor

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Bayfield Peninsula – Current System

Unable to close the loopLow voltage issuesMaintenance issuesReliability concern

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Bayfield Peninsula – Proposal

Rebuild Iron River-Gingles 34.5 kV to 115 kVConvert Bayfield and Washburn to 115kVNew 115/24 kV Herbster sub Feed Oulu sub from Iron RiverPort Wing, DPC Herbster, Herbster, Barksdale, and Cornucopia all converted to 24 kV

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Copper Mine Development

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Copper Mine

Northern Michigan MineDemand: 13 – 17 MWTime frame: 2013-2015Customer Connection

20 mile new 115 kV lineNew customer substation at site and modifications to current substation Only a proposed connection at this point

Eau Claire Region

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Clear Lake – Cedar Falls Rebuild

Clear Lake

Eau Claire

Menomonie

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Clear Lake – Cedar Falls Rebuild

42 mile line has been identified as requiring significant life extension workOptions

Major life extension project Approximately $7Life extension to last ~10 years then line must be rebuilt

(Has been done once already in 1997-1998)

Recommend rebuildCost ~$15 MAddress upcoming reliability issue

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Eau Claire Area

LufkinSubstation

Lufkin –London Tap

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Eau Claire Phase 2Concern

Load in area has eclipsed capacity of Eau Claire Substation 69 kV yard (and 161/69 kV transformers)Several DPC lines also overloading under contingency

Plan Install new Lufkin 161/69 kV substationRebuild Lufkin – London Tap 69 kV (6 miles)Allows operation of two 69 kV load-serving loops in Eau Claire Ultimately will transfer London Substation to 161 kV system for additional off-loading (~2025)

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Eau Claire Substation design

Eau Claire is the hub of Western WisconsinOperating challenges of the 161 kV yardCan impact most of Eau Claire and surrounding region

Recommended planBuild to breaker and ½ design

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Current Eau Claire Configuration

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Possible Breaker And ½ Design

69 kV Yard 345 kV Yard

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La Crosse Region

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La Crosse Area

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After

Before

Coulee AveConcern:- Multiple breaker outages

or transformer outage causes overloads to the surrounding area

Recommended Project (2012):

- 161 kV Ring Bus and upgrade transformer at Coulee Ave

- Note: Old Coulee Ave transformer planned to go to Monroe Co. project

La Crosse Area Projects

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Before

After

La Crosse Area Projects

MarshlandConcern:- Bus tie breaker failure

on the 161 kV bus causes low voltage for the area surrounding Marshland, WI

Recommended Project (2011):

- 161 kV Ring Bus at Marshland

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Monroe CountyConcern:- Monroe Co. TR1

overloads under peak system intact conditions

Recommended Project (2012):

- Install second 161/69 kV transformer at Monroe Co.

- Note: New transformer planned to come from Coulee Ave

La Crosse Area Projects

Wisconsin Transmission Development plans����June 15th, 2010��This report contains transmission planning data�that may be conceptual in nature and is subject�to change. The transmission projects listed may�change scope or not be constructedProposeDrivers for the Transmission DevelopmentsState Map of DevelopmentsDiscussionNorthern Wisconsin MapNorthern Wisconsin Drivers of DevelopmentNorthern Wisconsin Industrial LoadsOsprey – Park Falls and Bio-refinery ProjectsDiscussion: Osprey – Park Falls and Bio-refinery ProjectsBio Refinery System ImprovementsStone – Lake Couderay and Couderay – Osprey 161 kVStone Lake – Couderay DiscussionNorthern Wisconsin Pumping loadStone Lake – Couderay & Couderay – OspreyStinson – Bayfront RebuildStinson – Bayfront DiscussionBayfield Peninsula – Current SystemBayfield Peninsula – ProposalCopper Mine DevelopmentCopper MineEau Claire RegionClear Lake – Cedar Falls RebuildClear Lake – Cedar Falls RebuildEau Claire AreaEau Claire Phase 2Eau Claire Substation designCurrent Eau Claire ConfigurationPossible Breaker And ½ DesignSlide Number 30La Crosse AreaBeforeBeforeSlide Number 34Slide Number 35