Kendall Area Supply

Presentation to NEPOOL Reliability Committee

July 22, 2004

Kendall Area Load At Risk• Based on projected 2005 peak load conditions for

Cambridge the following constraints exist:– All lines in conditions require at least 25 MW of

generation to be running calling for two steam units to be dispatched

– N-1 conditions call for either dispatching a Jet or closing Mirant’s T43 115 kV tie

– N-1 + Generator out calls for both dispatching a Jet and closing Mirant’s T43 115 kV tie (see diagram)

• Conclusion is that two steam generating units as well as one jet generator are needed for system reliability until the new East Cambridge substation is in service

Cambridge Supply Concernsw/ Somerville Xfm Out and Loss of One Steam Unit