January 2012 Capital Investment - National Grid

Exhibit ___ (EIOP-19)Page 90 of 684Engineering Reliability ReviewAn Engineering Reliability Review (ERR) can be completed for any feeder experiencingreliability problems or any localized pocket of poor performance. ERR’s are oftenperformed on those feeders defined as Worst Performing Feeders (“WPF”) as describedin the Electric Service Reliability Report, filed annually in accordance with Case 90-E-1119. The scope of an ERR is typically a:• Review of one year and multi-year historical reliability data for current issues andtrends.• Review of recently completed and/or future planned work which is expected toimpact reliability.• Review the need for the installation of radial and/or loop scheme reclosers.• Review for additional line fuses to improve the sectionalization of the feeder.• Comprehensive review of the coordination of protective devices to ensure properoperation.• Review for equipment in poor condition.• Review of heavily loaded equipment.• Review for other feeder improvements such as fault indicators, feeder ties,capacitor banks, load balancing, additional switches and reconductoring(overhead and/or underground).Drivers:The ERR recommendations are utilized as a basis to improve the reliability on thecircuits experiencing recent poor reliability performance.Customer Benefits:The ERR program will improve customer reliability in areas in which performance hasbeen substandard.2011 to 2012 Variance:Projects associated with the ERR program are reactionary and are identified as reliabilityconcerns arise. As such, specific projects are only identified in the early years of theplan and future spending is maintained in a targeted budget reserve.Table IV-10Engineering Reliability ReviewProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 4.1 4.1 4.1 4.1 4.1 - 20.32012 - 5.9 3.8 3.5 3.5 3.5 20.2IV-14 1491