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Cape & Islands Electric Supply

Cape & Islands Electric Supply. Cape Wind Project Impact 10/31/2002 Presented by Charlie Salamone. Discussion Overview. Cape & Island Electric Use Existing Generation and Transmission Supply System Impact Assessments for New Resource Interconnections

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Cape & Islands Electric Supply

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  1. Cape & Islands Electric Supply Cape Wind Project Impact 10/31/2002 Presented by Charlie Salamone

  2. Discussion Overview • Cape & Island Electric Use • Existing Generation and Transmission Supply System • Impact Assessments for New Resource Interconnections • Standards of Review for New Interconnections • Interconnection Review Schedule

  3. Cape & Islands Electric Use • Cape summer peak loads have grown by over 100 MW since 1997 (growth rate of over 5% per year) • 1997 Summer Peak : 342 MW • 2002 Summer Peak : 446 MW • Total peak load supplied by the Cape transmission system includes: • 42 MW for supply to Martha’s Vineyard • 34 MW for supply to Nantucket • 404 MW for supply to Cape mainland • Average load on the system is over 230 MW and total energy delivered by the Cape transmission system is approximately 2.0 GWH

  4. Existing Transmission System • Existing transmission system operates at 115 kV and 345 kV voltages • Two 345 kV lines crossing the Cape Cod canal each are capable of carrying 1000 MW of load • Two 115 kV lines crossing the canal each are capable of carrying 225 MW of load • The Canal generating plant can deliver 1100 MW of capacity to the system • The Pilgrim generating plant can deliver 660 MW of capacity to the system

  5. 495 2 "B" 3422 8 "C" "D" "A" 33

  6. Impact Assessments for New Resource Interconnections • Federal regulations obligate us to interconnect a generator as long as all impacts to the transmission system are mitigated • NSTAR follows pre-established rules and works in concert with ISO-New England in assessing the impacts of the generator • A complete analysis of the operational, steady state as well as second-by-second electrical impact of the plant and its interconnection are thoroughly studied

  7. FIGURE 1 – Cape Wind Interconnection Alternative 1 Right of Way Canal Barnstable 115 kV 122 118 Orleans 120 119 Bourne 115 Underground Right of Way 115 kV Platform Substation 124 123 Hyannis Wind Turbines Proposed Interconnection Shore

  8. Standard of Review • Standards that must be met include: • Northeast Power Coordinating Council Reliability Standards • New England Power Pool Reliability Standards • NSTAR Reliability Standards • ISO Minimum Interconnection Standard • Reviewing bodies include: • DTE / Siting Board • ISO New England • Transmission Task Force (NE Transmission & Generation owners) • Stability Task Force (NE Transmission & Generation owners) • NEPOOL Reliability Committee • FERC

  9. Interconnection Review Schedule • Study efforts are currently under way • Detailed simulation models are under development for use in system impact studies • Study work will take from 6 to 8 months to complete • Review process will take from 2 to 3 months to complete • Final approval of the interconnection by NEPOOL and ISO-NE would be possible in about 1 year

  10. Electric System Impacts • Positive Impacts • Additional system resource • Fuel diversity • Cape transmission system voltage support • Potential Concerns • Dynamic response • Protection system coordination

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