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NEMA/Boston Congestion Mitigation Study

NEMA/Boston Congestion Mitigation Study. NEPOOL Reliability Committee Presentation August 16, 2000. Presented by: Charles Salamone (NSTAR) Hantz Pr é sum é (NSTAR) Study Participants: William Therriault (ISO-NE) Melissa Scott (NSTAR) Steven Masse (NSTAR)

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NEMA/Boston Congestion Mitigation Study

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  1. NEMA/Boston Congestion Mitigation Study NEPOOL Reliability Committee Presentation August 16, 2000 Presented by: Charles Salamone (NSTAR) Hantz Présumé (NSTAR) Study Participants: William Therriault (ISO-NE) Melissa Scott (NSTAR) Steven Masse (NSTAR) John Martin (National Grid USA) Wayne Coste (IREMM for ISO-NE)

  2. $76 Million uplift in NEMA/Boston fromSeptember 1, 1999 to June 30, 2000 NEMA/Boston uplift approximately 50% of NEPOOL total Evaluate Near-Term transmission alternatives that increase import capability into NEMA/Boston to mitigate congestion costs Evaluate Near-Term transmission upgrades to mitigate Out-of-Merit generation for voltage control Introduction 2

  3. Small Generators NEMA/Boston Area - 2002 Salem Harbor (PG&E Gen) 1, 2, 3, 4 Mystic (Sithe) 4, 5, 6 & 7 NEMA/Boston Interface Kendall (Southern) L = 5300 G = 3200 Downtown New Boston (Sithe) 1 & 2 Firm Import Capability 3,500 MW 3

  4. ISO Congestion Management Proposal (CMS/MSS) toFERC (March 31, 2000) for NEMA upgrades Joint effort between TO’s and ISO-NE Identify upgrades by September 2000 Perform Benefit to Cost Analysis Benefit: Congestion Savings Cost: Capital + Construction Congestion ISO Congestion Estimation Model Implement upgrades by June 2004 Capital cost sharing limit: $35 Million Study Scope 4

  5. Proposed Upgrades 5

  6. Phase 1: 2nd Framingham Auto, 240-601, Merrimack Auto, Dunbarton Tap, Mystic 106 Breaker Phase 2: West Medway Auto, Walpole Auto, 342-507 Phase 3: Waltham Auto, 282-602, 433-507, 274-509, 3rd Waltham PAR Construction Phases 6

  7. NEMA/BOSTON CONGESTION UPGRADES 115kV Upgrades: 282-507 (Waltham-Sudbury) 433-507 (Framingham-Speen St) 342-507 (Speen St-Sudbury) 274-509 (Medway-Sherborn) 230kV Upgrades: 240-601(W.Medway-Framingham) 282-602 (W.Medway-Waltham) Station Upgrades: Waltham Auto 3rd Waltham Phase Shifter 2nd Framingham Auto Walpole Auto Mystic 106 series breaker West Medway Auto 7

  8. Total capital cost of proposed upgrades = $33.5 M Estimated construction congestion cost = $11.1 M Present value of annual capital costs plus construction congestion costs = $49.9 M Present value of annual congestion savings = $144.1 M Benefit / Cost Ratio = 2.9 Break Even Point = 2 years Simple Payback Period = 4.5 years Benefit / Cost Analysis 8

  9. Southern Reinforcement 345kv UG: Canton – Hyde Park 115kv UG: Hyde Park – Dewar Street $122 million, 4+yrs Northern Reinforcement 345kv OH: Scobie - Tewksbury $41 million, 4+yrs Other Alternatives Considered 9

  10. Remaining Study Work Validate savings with proposed new generation Evaluate voltage related congestion Issue Phase I Report 18.4 approval of proposed upgrades Confirm upgrade proposal compatible with proposed new generator interconnections 15.5 approval of proposed upgrades Equipment procurement: 2001 NSTAR and Northeast Utilities Begin construction: 2002 Future work will examine further congestion reductions Next Steps 10

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