HomeMy WebLinkAbout97.Energy Policy PowerPointPresented by
Rob Thompson
Engineering Director
OCSD Energy Policy Update
OCSD Energy Picture
(Average month: July 2015 –April 2016)
•Internal
•Bio Gas 22,877,440 kWhr
Electrical Gen. 7,430,900 kWhr
•External
•Natural Gas 2,740 kWhr
•*SCE Electricity 4,745,000 kWhr
•Diesel Emergency Power
Total 27,655,180 kWhr
•Electricity 12,175,900 kWhr
•Thermal 2,697,000 kWhr
•Process 2,071,000 kWhr
•HVAC 626,000 kWhr
Supply Demand
* 13,565,000 kWhr of biogas needed for electrical energy independence
at 35% efficiency.
Energy Demand
•OCSD is very efficient in it’s utilization
•Premium efficiency motors
•Variable frequency pumping systems
•Turbo air blowers
•Fine bubble diffusers
•Lighting Systems
•Energy Audits
Energy Recovery—
Bio Gas Creation
Secondary Treatment
Primary Treatment Digester
Bio Gas
65% Methane (CH4)
34% Carbon Dioxide (CO2)
-640 BTU/CuFt
96°F
57% Solids
Destruction
Recirculation/Mixing Pump
Hot Water
Hot Water Return
Biosolids
2.8% of Input
Energy
9% of Input
Energy
36% Conversion
In case of
emergency or
Central
Generation
shutdown
Captures:
•Siloxane
•Hydrogen
Sulfide
Bio Gas Cooler Gas Compressor
Activated Carbon Central Generation
Hot water/Steam to Process
Electricity
Chilled Water to HVAC
Flare
Energy Recovery—
Bio Gas to Electricity and Heat
Condensed
Water
Proposed Policy Statement
•OCSD strives to be energy independent by minimizing
energy utilization and maximizing useful energy
recovery from the sewage it receives.
•Energy independence supports OCSD’s primary mission by providing resilient, reliable operations at the lowest
cost and environmental impact.
•Once OCSD’s energy needs are met, excess renewable
energy will be sold to support the electrical grid, natural gas distribution or as transportation fuel.
Research/Partnering Focus
•OCSD is focused on increasing Bio Gas production to
fully utilize Central Generation Capacity to meet
electricity and heat demand (no imported energy,
fully utilize 18 MW generation capacity).
•Sell excess energy to private markets:
•Electrical Grid
•Gas exports
•Transportation Fuels (Bio Diesel, Compressed Gas, Hydrogen)
•Maintain our carbon neutral exemption from the Cap and Trade System.