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HomeMy WebLinkAbout97.Item 7 Energy Efficiency Audit Findings PresentationGary Conklin, Senior Engineer Process Engineering Division ENERGY EFFICIENCY AUDIT FINDINGS Project Overview •General Manager’s Work Plan, Item 5, line 1 Evaluate the energy savings opportunities identified by The Energy Network (TEN). Present findings and implementation recommendations to the Board of Directors by March 2016. •Audit Was Funded By CPUC and SCE The Energy Network (TEN) Provides technical assistance and financial incentives. •Items Identified LED Lighting replacements. Areas of Focus Primary Treatment Secondary Treatment Raw Influent from Collections System Outfall Pumps Blowers add oxygen for the “Bugs.”Solids Digesters Sludge Pumps Cake Pumps Truck Loading Diffusers Make air bubbles Pumps Blowers Diffusers Demand % Pumping 30% Secondary 23 Solids 20 Ventilation 10 Misc 17 Areas of Focus–Pumps •Pumps/Compressors/Fans & Motors •Replacement is cost effective for condition-related rehab. •Variable Frequency Drives exist where they are cost- effective. Areas of Focus-Blowers Blowers were operating efficiently, except for Blower #1 (Plant No. 1), which will be addressed by planned maintenance. Areas of Focus-Diffusers Areas of Focus–LED Lights •Recent technology improvements have reduced the cost of LED lighting. •Retrofits can provide a break- even within 9 years, and save $700,000/year after initial $6.3M cost. •These improvements will be incorporated into ongoing CIP projects. Energy Efficiency forNew Facilities (and Rehab) •CIP Project Delivery Process incorporates energy efficiency review. •Engineering Standards are routinely updated to incorporate best available technologies. Operations Optimization •Operational Reports track key process metrics. •Power Bills are reviewed to identify trends, and anomalies. •Review Digester Gas production. •Compare Power Import vs In- House generation. •Power Monitoring System provides immediate feedback at each process area. Accounts for time-of-day price variations. Plant No. 1 Plant No. 2 Plant 1 Increasing Plant 2 Decreasing Conclusion •Engineering Standards incorporate best available technology •Facilities are continuously monitored and optimized. •TEN audit validated ongoing efforts, and identified LED lighting opportunities. Questions?