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Long-Range Transmission Study for Potential Central Georgia Generation Additions

This preliminary study addresses the need for a long-range transmission plan for Central Georgia due to high load growth and generation deficiency. Key issues include evaluating 500 kV systems, absorption challenges in Northeast Georgia, and proposing improvements for stability and breaker duty. The study outlines existing/budgeted transmission and proposed generation additions, focusing on areas like Oconee, Middle Fork, Bull Sluice, and more. It also discusses power flow improvements, 230 kV issues, absorption challenges, and trigger points for 500 kV upgrades. The study identifies the need for new generation sites and necessary system enhancements to support future capacity requirements.

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Long-Range Transmission Study for Potential Central Georgia Generation Additions

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  1. Long-Range Transmission Study for Potential Central Georgia Generation Additions Preliminary Study Results - Subject to Change

  2. Key Issues • North Georgia • High load growth • Generation deficient • Central Georgia • 9,200 MW of existing capacity (~8,000 MW has firm service) • 10,000 MW of new generation requests (2011-2017) • Overall Long-Range Transmission Plan Needed • Supports near-term individual TSR studies • Solidifies ITS long range plan Preliminary Study Results - Subject to Change

  3. Study Challenges and Goals • Challenges • “Export” of new generation via 500 kV and 230 kV systems • “Absorption” issues in Northeast Georgia • Stability and closing angle issues • Breaker duty issues • Goals • Evaluate 500 kV system and propose plan • Evaluate 10 GW and 5 GW scenarios • Determine “trigger” points for new 500 kV improvements Preliminary Study Results - Subject to Change

  4. Oconee 500 kV Middle Fork 500 kV Bull Sluice 500 kV South Hall 500 kV Norcross 500 kV Central Georgia Generation Study Existing & Budgeted Transmission – Proposed Generation Included East Walton 500/230 kV Klondike 500 kV Union City 500 kV Thomson 500 kV Hancock 500 kV +1,680 MW Glascock 230 kV +1,469 MW Vogtle 500 kV 2,300 MW +2,200 MW Rockville 500 kV O’Hara 500 kV Wash Co 500kV +1,469 MW Scherer 500 kV 3391 MW Warthen 500 kV 640 MW Wansley 500 kV Burke 500 kV +581 MW Independence 500 kV +840 MW Paul Creek 500 kV +594 MW Smarr 500 kV +1,162 MW W. McIntosh 500 kV Bonaire 500 kV Preliminary Study Results - Subject to Change

  5. Oconee 500 kV Middle Fork 500 kV Bull Sluice 500 kV South Hall 500 kV Norcross 500 kV East Walton 500 kV Klondike 500 kV Union City 500 kV Hancock 500 kV +1,680 MW Thomson 500 kV Glascock 230 kV +1,469 MW Vogtle 500 kV 2,300 MW +2,200 MW O’Hara 500 kV Wash Co 500kV +1,469 MW Scherer 500 kV 3391 MW Warthen 500 kV 640 MW S. Coweta 500 kV Burke 500 kV +581 MW Independence 500 kV +840 MW Paul Creek 500 kV +594 MW Smarr 500 kV +1,162 MW W. McIntosh 500 kV Central Georgia 5 GW Proposed 500 kV Plan GTC Confidential Do not share with Marketing Entities Bonaire 500 kV Preliminary Study Results - Subject to Change

  6. Oconee 500 kV Middle Fork 500 kV Bull Sluice 500 kV South Hall 500 kV Norcross 500 kV East Walton 500 kV Klondike 500 kV Union City 500 kV Hancock 500 kV +1,680 MW Thomson 500 kV Glascock 230 kV +1,469 MW Vogtle 500 kV 2,300 MW +2,200 MW O’Hara 500 kV Wash Co 500kV +1,469 MW Scherer 500 kV 3391 MW Warthen 500 kV 640 MW S. Coweta 500 kV Burke 500 kV +581 MW Independence 500 kV +840 MW Paul Creek 500 kV +594 MW Smarr 500 kV +1,162 MW W. McIntosh 500 kV GTC Confidential Do not share with Marketing Entities Central Georgia 10 GW Proposed 500 kV Plan Bonaire 500 kV Preliminary Study Results - Subject to Change

  7. Study Results – Power Flow (5 GW) 500 kV Improvements for 5 GW Study • Current Projects • Warthen – Thomson 500 kV line (38 miles) • Rockville (area) – East Walton 500/230 kV Project (55 miles) • Formerly East Walton – Rockville 500 kV Line • Vogtle – Thomson 500 kV line (50 miles) • New 500 kV Improvements Needed • East Walton – South Hall 500 kV Line (40 miles) • Rockville (area) – Washington CT 500 kV Line (35 miles) Preliminary Study Results - Subject to Change

  8. Study Results – Power Flow (5 GW) • Improvements required for 230 kV issues • Glascock – Wadley 230 kV Line • Branch 230 kV “re-configuration” or series reactors • Improvements required for Klondike, East Walton & South Hall “absorption” issues • 0.5 -1% series reactors on Klondike, East Walton and South Hall 500/230 kV transformers Preliminary Study Results - Subject to Change

  9. Study Results – Power Flow (5 GW) • Additional 5 GW “absorption” issues • Up-rates or upgrades of 230/115 kV transformers at Thomson, Snellville, Bay Creek, East Social Circle, and Middle Fork • Address O’Hara 230 kV Line loadings • Address Middle Fork 230 kV Line loadings • One 230 kV, 500 MVAR SVC needed • Address numerous 230 kV & 115 kV line loadings Preliminary Study Results - Subject to Change

  10. Other Study Results (5 GW) • Stability Analysis • No additional system improvements identified • Closing Angle Analysis • Rockville (area) – Washington Co 500 kV Line needed • Breaker Duty Analysis • East Walton and Burke sites require 40 kA, 500 kV breakers • All other new Central GA generation sites require 63 kA, 500 kV breakers Preliminary Study Results - Subject to Change

  11. Trigger Points for 500 kV Improvements • Up to 2,250 MW of new generation • No 500 kV Improvements • 2,250 MW to 4,250 MW of new generation • East Walton 500/230 kV S/S & East Walton 230 kV lines • East Walton – Rockville (area) 500 kV line & East Walton 230 kV reactor • 4,250 MW to 5,200 MW of new generation • East Walton – South Hall 500 kV line & South Hall 230 kV reactor • Rockville (area) – Washington CT 500 kV line Note: “New” generation totals include existing generation without firm service Preliminary Study Results - Subject to Change

  12. Trigger Points for 500 kV Improvements • 5,200 MW to 7,100 MW of new generation • Thomson – Middle Fork 500 kV Line & Middle Fork 500/230 kV transformer • Thomson – Vogtle 500 kV Line & Middle Fork 230 kV reactor • 7,100 MW to 9,900 MW of new generation • Smarr – South Coweta 500 kV Line & Branch area 230 kV reactors • 9,900 MW to 11,100 MW of new generation • Paul Creek - Bonaire 500 kV Line Note: “New” generation totals include existing generation without firm service Preliminary Study Results - Subject to Change

  13. Preliminary Study Results - Subject to Change

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