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?