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Southeastern Region Transmission Planning 2009 SERTP Economic Studies 2009 SERTP Economic Planning Studies 2009 SERTP Five Economic Planning Studies North Georgia to FRCC • 650 MW SCE&G to Georgia • 1000 MW Gulfport, MS to Georgia • 1000 MW Washington County, GA to Georgia • 5000 MW Savannah, GA to Southern Balancing Authority • 400 MW Summer Peak • 1000 MW Off Peak 2009 SERTP Power Flow Cases Utilized Study year: 2014 Load Flow Cases: • 2009 Series Version 2A • Summer Peak with 2250 MW Interchange to FRCC, 3600 MW to FRCC, and Shoulder 2009 SERTP Five Economic Planning Studies Final Report Components: • Thermal Analysis • DC contingency analysis to attain monitored/contingency pairs with Siemens PSS MUST • AC verified with Siemens PTI PSS/E • Interface Transfer Capability Impacts • Stability Impacts • Potential Solutions • Transmission Projects and Cost Estimates 2009 SERTP • The following information does not represent a commitment to proceed with the recommended enhancements nor implies that the recommended enhancements could be 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 to FRCC 650 MW North Georgia to FRCC: 650 MW • Transfer Type: Generation to Load • Source: 500 kV, Murray County, GA • Sink: 650 MW of FRCC load scaled up • 488 MW Florida Power & Light • 162 MW Progress Energy Florida Source Sink North Georgia to FRCC: 650 MW • Transfer Type: Generation to Load • Source: 500 kV, Murray County, GA • Sink: 650 MW of FRCC load scaled up • 488 MW Florida Power & Light • 162 MW Progress Energy Florida 650 MW North Georgia to FRCC: 650 MW Transmission System Impacts Thermal Constraints Identified: • One (1) 500kV Line • One (1) 230 kV Line • Six (6) 115 kV Lines Interface Constraints Identified: • One (1) 500 / 230 kV Transformer • One (1) 230 kV Line Stability Constraints Identified: • None Identified Thermal Constraints Interface Constraints Interface Constraints North Georgia to FRCC: 650 MW Transmission Project Estimates Item Potential Project Cost P1 North Americus – North Tifton 115 kV TL $1,350,000 P2 Douglas – Kettle Creek 115 kV TL $900,000 P3 Thalmann – Duval 500 kV TL N/A1 P4 Lloyd Shoals – South Griffin 115 kV TL $500,000 P5 Barneyville – Pine Grove 115 kV TL $250,000 P6 Mitchell – Moultrie 115 kV TL $3,000,000 P7 Jasper – Pine Grove 115 kV TL $11,000,000 I1 North Tifton 500 / 230 kV Substation $36,000,000 I2 Woodstock 230 kV Substation $100,000 Total Cost: $53,100,000 1 Limiting element is within FRCC Potential Enhancements P2 P1 P6 P5 P7 Potential Enhancements I1 Potential Enhancements I2 SCE&G to Georgia 1000 MW SCE&G to Georgia: 1000 MW • Transfer Type: Load to Generation • Source: SCE&G Load • Sink: Georgia Generation Source Sink SCE&G to Georgia: 1000 MW Transmission System Impacts Thermal Constraints Identified: • One (1) 230 / 115 kV Transformer • One (1) 115 kV Line Interface Constraints Identified: • • • • One (1) 500 / 230 kV Transformer Two (2) 230 kV Lines One (1) 230 / 115 kV Transformer Four (4) 115 kV Lines Stability Constraints Identified: • None Identified Thermal Constraints CENTER Interface Constraints SCE&G to Georgia: 1000 MW Transmission Project Estimates Item Potential Project Cost P1 Avalon Junction – Bio 115 kV TL $3,800,000 P2 Gainesville #2 115 kV Substation $200,000 I1 Athena – Hartwell 230 kV TL $44,000,000 I2 Center Primary 230 kV Substation Athena 230 kV Substation Total Cost: $48,300,000 $300,000 SCE&G to Georgia: 1000 MW Transmission Project Estimates Item Potential Project Cost P1 Avalon Junction – Bio 115 kV TL $3,800,000 P2 Gainesville #2 115 kV Substation $200,000 I1 Athena – Hartwell 230 kV TL1 $44,000,000 I2 Center Primary 230 kV Substation Athena 230 kV Substation Total Cost: $44,500,000 1Project I1 alleviates the need for Project P1 $300,000 Potential Enhancements P2 P1 CENTER Potential Enhancements P2 I2 P1 I1 Gulfport, MS to Georgia 1000 MW Gulfport, MS to Georgia: 1000 MW • Transfer Type: Generation to Generation • Source: 500 kV, Harrison County, MS • Sink: Georgia Generation Source Sink Gulfport, MS to Georgia: 1000 MW • Transfer Type: Generation to Generation • Source: 500 kV, Harrison County, MS • Sink: Georgia Generation 1000 MW Stability Enhancements P1 Gulfport, MS to Georgia: 1000 MW Transmission System Impacts Thermal Constraints Identified1: • Six (6) 230 kV Lines • Nine (9) 115 kV Lines Interface Constraints Identified2: • Two (2) 230 kV Lines 1 2 Constraints remaining after implementing stability enhancement Constraints remaining after implementing all thermal enhancements Gulfport, MS to Georgia: 1000 MW Transmission System Impacts Continued Stability Constraints Identified: • With the additional transfer of 1000 MW from Gulfport, MS to the Georgia ITS, a fault on the Daniel – McKnight 500 kV transmission line could result in all of the units within the local area to pull out of synchronism with the rest of the Eastern Interconnect. Constraints After Stability Enhancements Constraints After Stability Enhancements Interface Constraints Interface Constraints Gulfport, MS to Georgia: 1000 MW Transmission Project Estimates Item Potential Project Cost P1 Daniel – Snowdoun 500 kV TL $340,000,000 P2 Daniel – Bennett 230 kV TL $23,000,000 P3 Barry - Crist 230 kV TL $2,200,000 P4 South Montgomery – Union Spring 115 kV TL $3,500,000 P5 Pike County – Snowdoun 230 kV TL $18,300,000 P6 Farley – South Bainbridge 230 kV TL $2,500,000 P7 Anniston – Bynum 230 kV TL $10,000,000 P8 Bull Creek – Victory Drive 115 kV TL $2,500,000 P9 Crooked Creek – Martin Dam 115 kV TL $8,500,000 P10 Madison Park – Thurlow Dam 115 kV TL $750,000 … …Continued… … Gulfport, MS to Georgia: 1000 MW Transmission Project Estimates Item Potential Project Cost … ...Continued… …. P11 South Bainbridge 230 kV Substation $20,000,000 P12 Bainbridge Area 115 kV Network Enhancements $5,000,000 I1 Bennett – North Theodore 230 kV TL $760,000 I2 Goat Rock – Fortson 230 kV TL $20,000,000 Total Cost: $457,010,000 Potential Enhancements P9 P8 P10 P4 P5 P1 P2 P3 I1 P12 P6 P11 Potential Enhancements I2 Washington County to Georgia 5000 MW Washington Co. to Georgia: 5000 MW • Transfer Type: Generation to Generation • Source: Washington County, GA • Sink: Georgia Generation Source Sink Washington Co. to Georgia: 5000 MW • Transfer Type: Generation to Generation • Source: Washington County, GA • Sink: Georgia Generation 5000 MW Washington Co. to Georgia: 5000 MW Transmission System Impacts Thermal Constraints Identified: • • • • • Ten (10) 500 kV Lines Four (4) 500 / 230 kV Transformers Thirty (30) 230 kV Lines Six (6) 230kV / 115 kV Transformers Twenty-three (23) 115 kV Lines Interface Constraints Identified: • Three (3) 230 kV Lines Stability Constraints Identified: • None Identified Thermal Constraints Potential Enhancements (P1) P1 Thermal Constraints After P1 Potential Enhancements (P1 through P3) P2 P3 P1 Thermal Constraints After P3 Interface Constraints Interface Constraints Washington Co. to Georgia: 5000 MW Transmission Project Estimates Item Potential Project Cost 1 Yr. Advancement of Bethabara 230 / 115 kV Project from 2015 $3,200,000 1 Yr. Advancement of East Walton 500 / 230 kV Project from 2015 $13,300,000 P2 East Walton – South Hall 500 kV TL $54,500,000 P3 Rockville – ECO2 500 kV TL $81,700,000 P4 3 Yr. Advancement of the Middlefork – Thomson 500 kV TL $47,300,000 P5 Wilson 230 kV Substation $300,000 P6 Vogtle 500 / 230 kV Substation $35,300,000 P7 Waynesboro 230 / 115 kV Substation $50,000 P8 Jesup – Ludowici Primary 115 kV TL $1,750,000 … …Continued… … P1 Washington Co. to Georgia: 5000 MW Transmission Project Estimates Item Potential Project Cost … …Continued… … I1 Wadley Primary – Waynesboro Primary 230 kV TL $500,000 I2 Dum Jon – Goshen 230 kV TL $500,000 I3 Goat Rock – Fortson 230 kV TL $20,000,000 Total Cost: $258,400,000 Potential Enhancements (P1 through P8) P2 P4 P6 P3 P1 P5 P7 Potential Enhancements I2 I1 Potential Enhancements I3 Savannah, GA to Southern Balancing Authority 400 MW – Summer Peak 1000 MW – Off Peak Savannah, GA to Southern Balancing Authority • Transfer Type: Generation to Generation • Source: Savannah, GA • Sink: Southern Balancing Authority Source Sink Savannah, GA to Southern Balancing Authority • Transfer Type: Generation to Generation • Source: Savannah, GA • Sink: Southern Balancing Authority 400 MW Summer 1000 MW Off Peak Savannah, GA to SBA 400 MW Summer Peak Transmission System Impacts Constraints Identified: • Two (2) 230kV Lines • One (1) 115kV Line Interface Constraints Identified: • None Identified Stability Constraints Identified: • None Identified Thermal Constraints Savannah, GA to SBA 400 MW Summer Peak Transmission Project Estimates Item P1 P2 Potential Project Cost 1 Yr. Advancement of the Bethabara 230/115kV Project from 2015 $3,200,000 1 Yr. Advancement of the East Walton 500/230 kV Project from 2015 $13,300,000 Athena – Union Point 115kV TL $11,300,000 Total Cost: $27,800,000 Potential Enhancements P2 P1 Savannah, GA to SBA 1000 MW Off Peak Transmission System Impacts Thermal Constraints Identified: • One (1) 115kV Line Interface Constraints Identified: • None Identified Stability Constraints Identified: • None Identified Thermal Constraints Savannah, GA to SBA 1000 MW Off Peak Transmission Project Estimates Item Potential Project Cost P1 McIntosh – Yemassee 115kV TL $675,000 Total Cost: $675,000 Potential Enhancements P1 2009 SERTP Project Cost Summary North Georgia to FRCC • $53,100,000 SCE&G to Georgia • $44,500,000 Gulfport, MS to Georgia • $457,010,000 Washington County to Georgia • $258,400,000 Savannah, GA to Southern Balancing Authority • $28,475,000 • $27,800,000 for Summer Peak • $675,000 for Off Peak Questions?