Southeastern Region Transmission Planning 2009 SERTP Economic Studies.

Southeastern RegionSoutheastern RegionTransmission

Planning Transmission

Planning

2009 SERTP2009 SERTP

Economic StudiesEconomic Studies

2009 SERTP

Economic Planning StudiesEconomic Planning Studies

2009 SERTP

Five Economic Planning StudiesFive Economic Planning Studies

North Georgia to FRCCNorth Georgia to FRCC• 650 MW650 MW

SCE&G to Georgia SCE&G to Georgia • 1000 MW1000 MW

Gulfport, MS to Georgia Gulfport, MS to Georgia • 1000 MW1000 MW

Washington County, GA to Georgia Washington County, GA to Georgia • 5000 MW5000 MW

Savannah, GA to Southern Balancing Savannah, GA to Southern Balancing AuthorityAuthority

• 400 MW Summer Peak400 MW Summer Peak• 1000 MW Off Peak1000 MW Off Peak

2009 SERTP

Power Flow Cases UtilizedPower Flow Cases Utilized Study year: 2014Study year: 2014 Load Flow Cases:Load Flow Cases:

• 2009 Series Version 2A2009 Series Version 2A• Summer Peak with 2250 MW Interchange Summer Peak with 2250 MW Interchange

to FRCC, 3600 MW to FRCC, and to FRCC, 3600 MW to FRCC, and ShoulderShoulder

2009 SERTP

Five Economic Planning Studies Five Economic Planning Studies Final Report Components:Final Report Components:

• Thermal AnalysisThermal Analysis• DC contingency analysis to attain DC contingency analysis to attain

monitored/contingency pairs with Siemens monitored/contingency pairs with Siemens PSS MUSTPSS MUST

• AC verified with Siemens PTI PSS/EAC verified with Siemens PTI PSS/E

• Interface Transfer Capability ImpactsInterface Transfer Capability Impacts• Stability ImpactsStability Impacts• Potential SolutionsPotential Solutions

• Transmission Projects and Cost EstimatesTransmission Projects and Cost Estimates

2009 SERTP

• The following information does not represent a The following information does not represent a commitment to proceed with the recommended commitment to proceed with the recommended enhancements nor implies that the enhancements nor implies that the recommended enhancements could be recommended enhancements could be implemented by the study date of 2014. implemented by the study date of 2014.

• These potential solutions only address constraints identified within the Southern Balancing Area that are associated with the proposed transfers. Other Balancing Areas were not monitored which could result in additional limitations and required system enhancements.

North Georgia North Georgia

to to

FRCCFRCC

650 MW650 MW

North Georgia to FRCC: 650 MW

• Transfer Type: Generation to LoadTransfer Type: Generation to Load

• Source: 500 kV, Murray County, GASource: 500 kV, Murray County, GA

• Sink: 650 MW of FRCC load scaled upSink: 650 MW of FRCC load scaled up• 488 MW Florida Power & Light488 MW Florida Power & Light

• 162 MW Progress Energy Florida162 MW Progress Energy Florida

Source

Sink


• Transfer Type: Generation to LoadTransfer Type: Generation to Load

• Source: 500 kV, Murray County, GASource: 500 kV, Murray County, GA

• Sink: 650 MW of FRCC load scaled upSink: 650 MW of FRCC load scaled up• 488 MW Florida Power & Light488 MW Florida Power & Light

• 162 MW Progress Energy Florida162 MW Progress Energy Florida

650 MW


Transmission System ImpactsTransmission System Impacts Thermal Constraints Identified:Thermal Constraints Identified:

• One (1) 500kV LineOne (1) 500kV Line• One (1) 230 kV LineOne (1) 230 kV Line• Six (6) 115 kV LinesSix (6) 115 kV Lines

Interface Constraints Identified:Interface Constraints Identified:• One (1) 500 / 230 kV TransformerOne (1) 500 / 230 kV Transformer• One (1) 230 kV LineOne (1) 230 kV Line

Stability Constraints Identified:Stability Constraints Identified:• None IdentifiedNone Identified

Thermal Constraints

Interface Constraints


11 Limiting element is within FRCC Limiting element is within FRCC

ItemItem Potential ProjectPotential Project CostCost

P1P1 North Americus – North Tifton 115 kV TLNorth Americus – North Tifton 115 kV TL $1,350,000$1,350,000

P2P2 Douglas – Kettle Creek 115 kV TLDouglas – Kettle Creek 115 kV TL $900,000$900,000

P3P3 Thalmann – Duval 500 kV TLThalmann – Duval 500 kV TL N/AN/A11

P4P4 Lloyd Shoals – South Griffin 115 kV TLLloyd Shoals – South Griffin 115 kV TL $500,000$500,000

P5P5 Barneyville – Pine Grove 115 kV TLBarneyville – Pine Grove 115 kV TL $250,000$250,000

P6P6 Mitchell – Moultrie 115 kV TLMitchell – Moultrie 115 kV TL $3,000,000$3,000,000

P7P7 Jasper – Pine Grove 115 kV TLJasper – Pine Grove 115 kV TL $11,000,000$11,000,000

I1I1 North Tifton 500 / 230 kV SubstationNorth Tifton 500 / 230 kV Substation $36,000,000$36,000,000

I2I2 Woodstock 230 kV SubstationWoodstock 230 kV Substation $100,000$100,000

Total Cost: $53,100,000Total Cost: $53,100,000

Transmission Project EstimatesTransmission Project Estimates

Potential Enhancements

P1

P6

P2

P5

P7


I1


I2

SCE&G SCE&G

to to

GeorgiaGeorgia

1000 MW1000 MW

SCE&G to Georgia: 1000 MW

• Transfer Type: Load to GenerationTransfer Type: Load to Generation• Source: SCE&G LoadSource: SCE&G Load• Sink: Georgia GenerationSink: Georgia Generation

Source

Sink



• One (1) 230 / 115 kV TransformerOne (1) 230 / 115 kV Transformer• One (1) 115 kV LineOne (1) 115 kV Line

Interface Constraints Identified:Interface Constraints Identified:• One (1) 500 / 230 kV TransformerOne (1) 500 / 230 kV Transformer• Two (2) 230 kV Lines Two (2) 230 kV Lines • One (1) 230 / 115 kV TransformerOne (1) 230 / 115 kV Transformer• Four (4) 115 kV LinesFour (4) 115 kV Lines


Thermal Constraints

CENTER



P1P1 Avalon Junction – Bio 115 kV TLAvalon Junction – Bio 115 kV TL $3,800,000$3,800,000

P2P2 Gainesville #2 115 kV SubstationGainesville #2 115 kV Substation $200,000$200,000

I1I1 Athena – Hartwell 230 kV TLAthena – Hartwell 230 kV TL $44,000,000$44,000,000

I2I2Center Primary 230 kV SubstationCenter Primary 230 kV Substation

$300,000$300,000Athena 230 kV SubstationAthena 230 kV Substation





P1P1 Avalon Junction – Bio 115 kV TLAvalon Junction – Bio 115 kV TL $3,800,000$3,800,000

P2P2 Gainesville #2 115 kV SubstationGainesville #2 115 kV Substation $200,000$200,000

I1I1 Athena – Hartwell 230 kV TLAthena – Hartwell 230 kV TL11 $44,000,000$44,000,000

I2I2Center Primary 230 kV SubstationCenter Primary 230 kV Substation

$300,000$300,000Athena 230 kV SubstationAthena 230 kV Substation



1Project I1 alleviates the need for Project P1


CENTER

P1

P2


I1

I2 P1

P2

Gulfport, MS Gulfport, MS

to to

GeorgiaGeorgia

1000 MW1000 MW

Source

Sink

Gulfport, MS to Georgia: 1000 MW

• Transfer Type: Generation to GenerationTransfer Type: Generation to Generation• Source: 500 kV, Harrison County, MSSource: 500 kV, Harrison County, MS• Sink: Georgia GenerationSink: Georgia Generation

Gulfport, MS to Georgia:1000 MW

• Transfer Type: Generation to GenerationTransfer Type: Generation to Generation• Source: 500 kV, Harrison County, MSSource: 500 kV, Harrison County, MS• Sink: Georgia GenerationSink: Georgia Generation

1000 MW

Stability Enhancements

P1


Transmission System ImpactsTransmission System Impacts Thermal Constraints IdentifiedThermal Constraints Identified11::

• Six (6) 230 kV LinesSix (6) 230 kV Lines• Nine (9) 115 kV LinesNine (9) 115 kV Lines

Interface Constraints IdentifiedInterface Constraints Identified22::• Two (2) 230 kV Lines Two (2) 230 kV Lines

1 1 Constraints remaining after implementing stability Constraints remaining after implementing stability enhancementenhancement

2 2 Constraints remaining after implementing all Constraints remaining after implementing all thermal enhancementsthermal enhancements


Transmission System Impacts Transmission System Impacts ContinuedContinued

Stability Constraints Identified:Stability Constraints Identified:• With the additional transfer of 1000 MW With the additional transfer of 1000 MW

from Gulfport, MS to the Georgia ITS, a from Gulfport, MS to the Georgia ITS, a fault on the Daniel – McKnight 500 kV fault on the Daniel – McKnight 500 kV transmission line could result in all of the transmission line could result in all of the units within the local area to pull out of units within the local area to pull out of synchronism with the rest of the Eastern synchronism with the rest of the Eastern Interconnect. Interconnect.

Constraints After Stability Enhancements



P1P1 Daniel – Snowdoun 500 kV TLDaniel – Snowdoun 500 kV TL $340,000,000$340,000,000

P2P2 Daniel – Bennett 230 kV TLDaniel – Bennett 230 kV TL $23,000,000$23,000,000

P3P3 Barry - Crist 230 kV TLBarry - Crist 230 kV TL $2,200,000$2,200,000

P4P4 South Montgomery – Union Spring 115 kV TLSouth Montgomery – Union Spring 115 kV TL $3,500,000$3,500,000

P5P5 Pike County – Snowdoun 230 kV TLPike County – Snowdoun 230 kV TL $18,300,000$18,300,000

P6P6 Farley – South Bainbridge 230 kV TLFarley – South Bainbridge 230 kV TL $2,500,000$2,500,000

P7P7 Anniston – Bynum 230 kV TLAnniston – Bynum 230 kV TL $10,000,000$10,000,000

P8P8 Bull Creek – Victory Drive 115 kV TLBull Creek – Victory Drive 115 kV TL $2,500,000$2,500,000

P9P9 Crooked Creek – Martin Dam 115 kV TLCrooked Creek – Martin Dam 115 kV TL $8,500,000$8,500,000

P10P10 Madison Park – Thurlow Dam 115 kV TLMadison Park – Thurlow Dam 115 kV TL $750,000$750,000

…… ……Continued…Continued… ……




…… ...Continued…...Continued… ……..

P11P11 South Bainbridge 230 kV SubstationSouth Bainbridge 230 kV Substation $20,000,000$20,000,000

P12P12 Bainbridge Area 115 kV Network Bainbridge Area 115 kV Network EnhancementsEnhancements $5,000,000$5,000,000

I1I1 Bennett – North Theodore 230 kV TLBennett – North Theodore 230 kV TL $760,000$760,000

I2I2 Goat Rock – Fortson 230 kV TLGoat Rock – Fortson 230 kV TL $20,000,000$20,000,000




P1P2

P3

P6

P9

P5

P8

P4

P10

P11

P12

I1


I2

Washington County Washington County

to to

GeorgiaGeorgia

5000 MW5000 MW

Source

Sink

Washington Co. to Georgia:5000 MW

• Transfer Type: Generation to GenerationTransfer Type: Generation to Generation• Source: Washington County, GASource: Washington County, GA• Sink: Georgia GenerationSink: Georgia Generation


• Transfer Type: Generation to GenerationTransfer Type: Generation to Generation• Source: Washington County, GASource: Washington County, GA• Sink: Georgia GenerationSink: Georgia Generation

5000 MW



• Ten (10) 500 kV LinesTen (10) 500 kV Lines• Four (4) 500 / 230 kV TransformersFour (4) 500 / 230 kV Transformers• Thirty (30) 230 kV LinesThirty (30) 230 kV Lines• Six (6) 230kV / 115 kV TransformersSix (6) 230kV / 115 kV Transformers• Twenty-three (23) 115 kV LinesTwenty-three (23) 115 kV Lines

Interface Constraints Identified:Interface Constraints Identified:• Three (3) 230 kV Lines Three (3) 230 kV Lines


Thermal Constraints

Potential Enhancements (P1)

P1

Thermal Constraints After P1

Potential Enhancements (P1 through P3)

P3

P2

P1

Thermal Constraints After P3



P1P1

1 Yr. Advancement of Bethabara 230 / 1 Yr. Advancement of Bethabara 230 / 115 kV Project from 2015115 kV Project from 2015 $3,200,000$3,200,000

1 Yr. Advancement of East Walton 500 / 1 Yr. Advancement of East Walton 500 / 230 kV Project from 2015230 kV Project from 2015 $13,300,000$13,300,000

P2P2 East Walton – South Hall 500 kV TLEast Walton – South Hall 500 kV TL $54,500,000$54,500,000

P3P3 Rockville – ECO2 500 kV TLRockville – ECO2 500 kV TL $81,700,000$81,700,000

P4P4 3 Yr. Advancement of the Middlefork – 3 Yr. Advancement of the Middlefork – Thomson 500 kV TLThomson 500 kV TL $47,300,000$47,300,000

P5P5 Wilson 230 kV SubstationWilson 230 kV Substation $300,000$300,000

P6P6 Vogtle 500 / 230 kV SubstationVogtle 500 / 230 kV Substation $35,300,000$35,300,000

P7P7 Waynesboro 230 / 115 kV SubstationWaynesboro 230 / 115 kV Substation $50,000$50,000

P8P8 Jesup – Ludowici Primary 115 kV TLJesup – Ludowici Primary 115 kV TL $1,750,000$1,750,000






I1I1Wadley Primary – Waynesboro Primary Wadley Primary – Waynesboro Primary

230 kV TL230 kV TL $500,000$500,000

I2I2 Dum Jon – Goshen 230 kV TLDum Jon – Goshen 230 kV TL $500,000$500,000

I3I3 Goat Rock – Fortson 230 kV TLGoat Rock – Fortson 230 kV TL $20,000,000$20,000,000



Potential Enhancements (P1 through P8)

P4

P5

P6

P7

P3

P2

P1


I1

I2


I3

Savannah, GA Savannah, GA

to to

Southern Balancing Southern Balancing AuthorityAuthority

400 MW – Summer Peak400 MW – Summer Peak

1000 MW – Off Peak1000 MW – Off Peak

Source

Sink

Savannah, GA to SouthernBalancing Authority

• Transfer Type: Generation to GenerationTransfer Type: Generation to Generation• Source: Savannah, GASource: Savannah, GA• Sink: Southern Balancing AuthoritySink: Southern Balancing Authority

Savannah, GA to SouthernBalancing Authority

• Transfer Type: Generation to GenerationTransfer Type: Generation to Generation• Source: Savannah, GASource: Savannah, GA• Sink: Southern Balancing AuthoritySink: Southern Balancing Authority

400 MW Summer1000 MW Off Peak

Savannah, GA to SBA400 MW Summer Peak

Transmission System ImpactsTransmission System Impacts Constraints Identified:Constraints Identified:

• Two (2) 230kV LinesTwo (2) 230kV Lines• One (1) 115kV LineOne (1) 115kV Line

Interface Constraints Identified:Interface Constraints Identified:• None Identified None Identified


Thermal Constraints

Savannah, GA to SBA400 MW Summer Peak


P1P1

1 Yr. Advancement of the Bethabara 1 Yr. Advancement of the Bethabara 230/115kV Project from 2015230/115kV Project from 2015 $3,200,000$3,200,000

1 Yr. Advancement of the East 1 Yr. Advancement of the East Walton 500/230 kV Project from Walton 500/230 kV Project from

20152015$13,300,000$13,300,000

P2P2 Athena – Union Point 115kV TLAthena – Union Point 115kV TL $11,300,000$11,300,000




P2

P1

Savannah, GA to SBA1000 MW Off Peak


• One (1) 115kV LineOne (1) 115kV Line

Interface Constraints Identified:Interface Constraints Identified:• None Identified None Identified


Thermal Constraints

Savannah, GA to SBA1000 MW Off Peak


P1P1 McIntosh – Yemassee 115kV TLMcIntosh – Yemassee 115kV TL $675,000$675,000

Total Cost: $675,000Total Cost: $675,000



P1

2009 SERTP

Project Cost Summary Project Cost Summary North Georgia to FRCCNorth Georgia to FRCC

• $53,100,000$53,100,000 SCE&G to Georgia SCE&G to Georgia

• $44,500,000$44,500,000 Gulfport, MS to Georgia Gulfport, MS to Georgia

• $457,010,000$457,010,000 Washington County to Georgia Washington County to Georgia

• $258,400,000$258,400,000 Savannah, GA to Southern Balancing Savannah, GA to Southern Balancing

AuthorityAuthority• $28,475,000$28,475,000

• $27,800,000 for Summer Peak$27,800,000 for Summer Peak• $675,000 for Off Peak$675,000 for Off Peak

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Southeastern Region Transmission Planning 2009 SERTP Economic Studies.

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