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WATER €N ER 6 I I F E RIVERSIDE PUBLIC UTILITIES Board Memorandum PUBLIC U T I L I T I I S BOARD OF PUBLIC UTILITIES DATE: August 5, 2011 ITEM NO: 3 SUBJECT: ADDITION OF TRANSFORMER TEMPERATURE CONTROLLERS AT FREEMAN, MOUNTAIN VIEW,HARVEY LYNN,AND LA COLINA SUBSTATIONS—WORK ORDER NO. 1112286 ISSUE: Board of Public Utilities approval is requested for Work Order No. 1112286. RECOMMENDATION: That the Board of Public Utilities approve Work Order No. 1112286 in the amount of$150,601 forthe addition of Transformer Temperature Controllers at Freeman, Mountain View, Harvey Lynn, and La Colina Substations, BACKGROUND: Transformer temperature controllers("TTCs")are electronic devices that monitor transformer oil and winding temperatures, control transformer cooling fans, and provide real-time transformer temperature data and alarms to the electric system's Supervisory Control and Data Acquisition (SCADA) system. Understanding the internal temperatures of substation transformers plays a significant role in improving the reliability of Riverside Public Utilities' (RPU) electric system. By monitoring transformer oil and winding temperatures, RPU can effectively determine whether a transformer is being overloaded, and then make appropriate load adjustments based on real-time data to reduce the probability of power outages. Furthermore, by knowing the oil and winding temperatures of the substation transformers, RPU can more accurately predict the operating life of a transformer and make proactive plans for more frequent transformer maintenance or transformer replacement. RPU currently has ten(1 0)TTCs in operation at various substations. Work Order No. 1112286 includes the installation of five(5) additional TTC's. The TTCs will be added at Freeman(T1 and T4),Mountain View(T4), Harvey Lynn (T4), and La Colina(T3)Substations at the transformer noted. Each of these transformers was selected for the addition of a TTC because of their relatively high electrical loading and because of the age of the transformer. Other substation transformers will be evaluated for TTC additions in the years to come. The electrical engineering was performed by Riverside Public Utilities (RPU). Electrical work will be performed by RPU field forces. FISCAL IMPACT: The total capital expenditure for this project on Work Order No. 1112286 is estimated to be$150,601,which includes all costs for equipment, materials,engineering, construction,overhead, and contingency as follows: