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Kendall Station

Kendall Station. NEPOOL Reliability Committee June 22, 2004. Kendall Station Kendall CT – 187 MW combustion turbine Kendall Steam Turbines – 63 MW, powered by CT/HRSG or by pre-existing boilers Kendall Jet 1 and Jet 2. Kendall Is Needed for Reliability.

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Kendall Station

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  1. Kendall Station NEPOOL Reliability Committee June 22, 2004

  2. Kendall Station Kendall CT – 187 MW combustion turbine Kendall Steam Turbines – 63 MW, powered by CT/HRSG or by pre-existing boilers Kendall Jet 1 and Jet 2 Kendall Is Needed for Reliability Local Reliability Need and Experience Zonal Operational Exposures ISO Analysis Flexible, efficient, clean dual-fuel station with quick-start capability, located in a key load pocket in New England

  3. Local Reliability • Steam turbines run virtually every day at NStar’s request • “The three steam turbines and the two jets at Kendall are needed for local reliability. … At peak load all three of the steam units are needed to maintain the 13.8kV system below normal ratings. After the occurrence of a critical 13.8kV contingency, the Kendall Jets are required to maintain the 13.8kV system below applicable emergency ratings.” ISO Memorandum, 5/19/04 • At least until the East Cambridge substation is in service, the local generation is needed. • Without the CT, only two steam turbines are available at any time due to the inoperable condition of Boiler #1. • Jets can support black start system restoration plan.

  4. NEMA/Boston Zone • Boston Import Interface normally operated ~1000 MW below full capability to provide contingency coverage • Large generation contingencies within the zone (eg, Mystic 8 & 9, Salem Harbor 4, New Boston 1) • Kendall CT, ST 3, Jet 1 and Jet 2 are on ISO’s list of ‘Daily RMR’ units for 2004-2005 • “likely” to be “identified by the ISO on a daily basis as necessary for the provision of Operating Reserve requirements and adherence to NERC, NPCC and NEPOOL reliability criteria over and above those Resources required to meet first contingency reliability criteria within a Reliability Region.” NEPOOL Manual 11, Section 6.3.2

  5. ISO Analysis • ISO studies are based, among other things, on nameplate ratings of generators, ‘typical’ transmission capabilities and ‘average’ generation outages. All of these can vary in actual practice. • “Margins are thin – a force majeure event could compromise reliability of service.” ISO Presentation to Mass DTE regarding NEMA/Boston and retirement applications of Mystic 4-6, New Boston 1 and Salem Harbor 1-4, June 12, 2003

  6. ISO Analysis, continued • “… the immediate retirement of 263 MW of Kendall generation would be acceptable. However, … the retirement of Kendall [in addition to other planned retirements] would result in a shortfall of over 125 MW by 2008 even with the 345kV improvements.” ISO Memorandum, May 19, 2004 • If units are deactivated, they have no obligation to return to service • “Adding Kendall to the retirement list would advance the need for resources to 2006, making the 345kV project a ‘just-in-time’ project.” ISO Memorandum, May 19, 2004

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