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Reliability Assessment of Wallingford Units 2-5 Presentation to NEPOOL Reliability Committee

This presentation reviews the reliability assessment of Wallingford Units 2-5, featuring simple cycle combustion turbines, with a total capacity of 165.5 MW (S) and 198 MW (W), located in Wallingford, CT. It discusses the background for assessment, owner information, ISO deactivation application, need examination using LOLE, DAUC, and SCED methods, and import limits. The results demonstrate existing system deficiencies with and without Wallingford units for both 2003 and 2006.

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Reliability Assessment of Wallingford Units 2-5 Presentation to NEPOOL Reliability Committee

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  1. Reliability Assessment of Wallingford Units 2-5 Presentation to NEPOOL Reliability Committee May 6, 2003

  2. Wallingford Units 2-5 • Simple cycle combustion turbines (LM 6000) installed end of 2001, beginning of 2002 • Located in Wallingford, CT; eastern edge of Greater SWCT • Total Capacity:165.5 MW (S), 198 MW (W) • Fuel: natural gas

  3. Background for Assessment • Owner: PPL Wallingford Energy LLC • On January 16 owner applied to FERC for Reliability Must Run Cost of Service (RMRCOS) contract to be effective February 1 • Owner submitted 18.4 Application April 1 to ISO for deactivation of Units 2, 3, 4 and 5 effective July 1 • 18.4 Application caused by uncertainties of RMRCOS approval and its effective date

  4. Wallingford Assessment • ISO examined the need for the 4 units using 3 methods for assessing reliability: • Generation Resource Adequacy: LOLE • Transmission/Operating Reserve Adequacy: Day Ahead Unit Commitment (DAUC) • Security Constrained Economic Dispatch (SCED)

  5. Assumptions • 2003 CELT Reference Peak Loads (50/50 Probability) • 2003: 25,120 MW • 2006: 26,290 MW • Import Limits • CT: 2200 MW • SWCT: 2000 MW (2003); 2600 MW (2006) • Milford Power operation uncertain: 490 MW • Long Island 1385 cable in service

  6. LOLE Results

  7. DAUC Results for Connecticut *Millstone 2 & 3

  8. DAUC Results for Greater SWCT * Norwalk Harbor + BEC ** SWCT Phase I 345 kV Line

  9. SCED Results: Greater SWCT *Nor Har 2 + BEC **BPH 3 + BEC

  10. Conclusions • Method showing greatest need for Wallingford units establishes the system need. • 2003 • DAUC and SCED Results: Existing system deficient with Wallingford Units 2-5 • SCED Results: Existing system with Milford Power operating is deficient with Wallingford units • 2006 • DAUC CT Results: Existing system is deficient with Milford

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