January 2012 Capital Investment - National Grid

Exhibit ___ (EIOP-19)Page 45 of 684Gardenville (C05156 & C30084) $68.0mGardenville is a 230/115kV station south of Buffalo that has two 115kV stations in closeproximity that are referred to respectively as New Gardenville and Old Gardenville, andwhich both serve over 750MW of regional load. New Gardenville was built between1959 and 1969 and has asset condition issues such as faulty control cables,deteriorated foundations and many disconnects which have deteriorated beyond repair.Old Gardenville, built in the 1930s, feeds regional load via eleven 115kV lines. Thestation has serious asset condition issues including, but not limited to, control cable,breaker, disconnect and foundation problems. The station has had no major updatessince it was built. There have been a number of misoperations that can be directlyattributed to control cable issues in the past several years alone.A project has been initiated to address these issues. A new breaker-and-a-half 115kVstation is to be built between the two existing stations to replace them. A new 115kVswitchyard will be constructed in the western section of the site and there will bererouting of approximately seventeen 115kV lines for the project to eliminate the current“criss-cross” arrangement outside of the station and eliminate line to ground clearanceissues. Project sanction is expected in winter of 2013 after the completion of preliminaryengineering.Rome (C03778 and C34983) $9.5mThe Rome station was constructed in the early 1920s. It has received severalreconfigurations over the years with the current 115kV to 13.2kV dual bus built in theearly 1970s. The 115kV system at the Rome Station experiences periods of low voltageparticularly if the tie-breaker is opened. Station property near the north bus section hasbeen under environmental remediation the past several years due to a former coke plantthat was located on the site. Assets located on the North yard will be relocated awayfrom this remediation site.There are multiple asset condition issues affecting the station noted in the 2011 AssetCondition Report. A Strategy paper proposing a station rebuild was sanctioned inOctober 2010 and preliminary engineering was completed in the fall of 2010 withsanction expected for June 2011. Project completion is targeted for spring of 2015.Oneida (C37876) $3mOneida is a 115 kV – 13.8 kV substation located in Verona, NY. The original station wasconstructed in the 1940s. The substation includes two LTC power transformers, eight115 kV circuit breakers, one 115 kV capacitor bank with circuit switcher, and a metalcladswitchgear with seven 13.8 kV feeders.The physical and electrical layout of the 115 kV yard makes it difficult to maintain orrepair equipment. Outages to maintain the 115 kV breakers are difficult since a lineoutage is required. The two 1959 Federal Pacific Equipment circuit breakers arecandidates for replacement due to maintenance issues and a lack of replacement parts.Spare parts are also no longer available for 13.8 kV breakers and the metal-cladswitchgear is in poor condition. The lines to Rome and Yahnundasis are difficult to getout due to voltage support issues and taking the R40 line out requires a customeroutage. The vertical phase configuration of the East/West 115kV busses is a concernII-2846