January 2012 Capital Investment - National Grid

Exhibit ___ (EIOP-19)Page 110 of 684Circuit SwitcherStrategy paper SG 062v2 “S&C Type G and Mark II Circuit Switcher Replacement”,approved Nov 2010, addresses the eighty-three problematic S&C Type G and Mark IIcircuit switchers on the Northeast Transmission network in both New York and NewEngland. This program was not listed in the 2011 CIP.Drivers:In 2000, S&C announced that parts specific to the Type G and Mark II circuit switchermodels would no longer be manufactured and support for these models would belimited. While these switches were relatively reliable at that time, since 2003 they havebegun to exhibit problems. At present, there are limited options for repairing anyproblems that occur on these switches as spare parts and support formerly offered fromS&C are no longer available. No other manufacturers fabricate or supply these parts.Customer Benefits:Replacement of obsolete, deteriorated and problematic circuit switchers will lead toimproved reliability performance providing our customers with improved service.Planned replacement offers the lowest lifetime cost approach for customers.2011 to 2012 Variance:This program is new to the Plan.Table IV-26Circuit SwitcherProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 - - - - - - -2012 - - 2.0 1.0 - 5.0 8.0IV-34 34111