January 2012 Capital Investment - National Grid

Exhibit ___ (EIOP-19)Page 121 of 684the local 115kV transmission system.The Capital-East study area serves approximately 88,200 customers. The study area islocated east of the Hudson River, with the center approximately adjacent to Albany. Thisarea extends approximately from Valley Falls in the north to Tivoli in the south. The largerload concentrations are in the cities of Rensselaer and Troy and in the towns along USRoute 9. There is a 345kV source into the area at Reynolds Road substation and a 115kVcorridor running in a north-south direction supplying approximately 90% of the distributionload in the area. There is also a 34.5kV sub-transmission system in the central area withthe 115kV sources from Greenbush, North Troy, Hudson and Hoosick substations. Inaddition, there is scattered generation on the 34.5kV system in the area.The Capital-North study area serves approximately 80,900 customers. The study areaencompasses the suburban area north of the City of Albany, including a mixture ofindustrial, commercial and residential customers throughout Colonie, Cohoes, Watervliet,Clifton Park, Halfmoon, Waterford, Niskayuna, and Ballston. The primary distributionsystem in Capital-North is predominantly 13.2kV with a few pockets of 4.16kV in theNewtonville area and 4.8kV in the Town of Ballston. All 4kV distribution substations aresupplied from the 34.5kV sub-transmission system, whereas most 13.2kV distributionsubstations are supplied from the 115kV transmission system. Maplewood and Patroonsubstations are the main sources for the 34.5kV sub-transmission system in this area, whichis operated in loop configuration. Along with these facilities, a group of hydro andcogeneration power plants located along the Mohawk Riverform the backbone of the local 34.5kV sub-transmission system.In addition to supplying power to all 4kV and a few 13.2kV distribution substations, the34.5kV sub-transmission system serves several industrial customers such as MohawkPaper, Honeywell, Norlite, and Cascade Tissue. Major distribution customers in this areainclude the Albany International Airport, which is supplied by feeders from Forts Ferry, SandCreek, Wolf Road, and Inman Road substations.The Mohawk study area serves approximately 55,600 customers. The study area includesthe city of Amsterdam and the rural areas west of the city. This area is comprised of mostlyresidential customers and farms with some commercial and industrial customers located inareas such as the City of Amsterdam, Gloversville, Johnstown, Northville, and Canajoharie.The primary distribution system in Mohawk is predominantly 13.2kV with areas of 4.16kV(Gloversville and Johnstown areas) and 4.8kV (Canajoharie). Most 4kV distributionsubstations are supplied from the 23kV and 69kV sub-transmission system, whereas most13.2kV distribution substations are supplied from the 115kV transmission system.The Schenectady study area serves approximately 58,100 customers. The study area isdefined by the region that includes the City of Schenectady and the surrounding suburbanareas. This area includes a mixture of industrial, commercial and residential customersspread across downtown to suburban areas such as Niskayuna, Glenville, and Rotterdam.The primary distribution system in Schenectady area is predominantly 13.2kV with a fewpockets of 4.16kV (Schenectady, Scotia and Rotterdam areas). All 4kV distributionsubstations are supplied from the local 34.5kV sub-transmission system, whereas most13.2kV distribution substations are supplied from the local 115kV transmission system. Inaddition, the downtown areas of Schenectady are served by a general network that issupplied by the Front Street Substation. Rotterdam, Woodlawn and Rosa Rd. are the mainsources for the local 34.5kV sub-transmission system, which is operated in loopconfiguration.V - 7122