Energy Management OCSD Service Area Orange 572 miles of sewers - - PowerPoint PPT Presentation

Energy Management

OCSD Service Area

572 miles of sewers 471 square miles 200 million gallons per day 2.5 million population 20 cities, 4 special districts 15 pumping stations 2 treatment plants Orange County

Pacific Ocean Ocean Pipeline

Reclamation Plant No. 1 Treatment Plant No. 2

Newport Beach Fountain Valley Santa Ana Los Alamitos Buena Park Fullerton Tustin Garden Grove La Habra Brea Placentia Yorba Linda Anaheim Anaheim Orange La Palma Cypress Westminster Irvine Stanton Villa Park Costa Mesa Huntington Beach Seal Beach

Water Resource Recovery

Solids Reuse Solids Dewatering

Reclaim/ Effluent

Digesters

Influent Energy to Plant

Digester Gas

Heat

Preliminary Treatment

Primary Treatment Secondary Treatment Solids Processing

Central Power Generation System Engines

8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 MW Total Generation Estimated Generation Total Plant Load Estimated Plant Load

500 700 900 1,100 1,300 1,500 1,700 1,900 2,100 2,300 Jul' 05 Oct Jan'06 Apr Jul' 06 Oct Jan'07 Apr Jul' 07 Oct Jan'08 Apr Jul' 08 Oct Jan'09 Apr Jul' 09 Oct Jan'10 Apr Jul'10 Oct Jan'11 Apr Jul'11 Oct Jan'12 Apr Jul'12 Oct Jan'13 Apr Jul'13 Oct Jan'14 Apr

Total Influent Power Efficiency (kWh/MGD)

P1 Energy Efficiency P2 Energy Efficiency

Industry’s Best Practices

• Know how energy is being used
• Know what you are paying
• Understand the onsite energy

generation

• Build efficiency into new projects
• Participate in Edison (SCE) efficiency

programs

• Monitor alternative energy
• pportunities

Energy Utilization

Power Monitoring System at Each Plant

• Monthly electric, gas and heat data

collected and analyzed

• Energy used by each process

is estimated annually

• Used for cost allocations and

economic analyses of alternate processes

• Used as baseline for efficiency

projects

Energy Utilization

Power Monitoring (cont’d) System at Each Plant

• Identifies opportunities

for energy savings

• Energy info is made available to

Operations staff to optimize use

• Time of day price variations
• Impact of taking equipment
• ut of service

Know What You Are Paying

Bills are Analyzed for Accuracy

• Credit for $25 K (SCE meter

failure)

• SCE credit for $73,000 for standby

tariff appeal

• We understand the tariffs /

energy markets

• Operation during Peak hours
• Meet with utility reps quarterly

Onsite Energy Management

Produce 11 MW of Electricity Recover 1.3 M Therms Heat Saved Electricity $ 483,000 Natural Gas $ 510,000 $ 993,000 Annually

J-111 Project: Cengen Engines Emissions Reduction

2-Step Catalytic System

NOx Removal Catalyst Chemical Injection CO Removal Catalyst Digester Gas Treatment

Build Efficiency into New Projects

• Ultra Premium efficiency

motors

• Use of variable speed motor

controllers

• High efficiency lighting

including LED

• Multi-level lighting
• Optimize pumping & blower

applications to maximize efficiency

Participate in SCE Efficiency Programs

• Savings by design

 $193,000 received for three projects

• SCE Pump testing and optimization

program

• Energy conservation review -

Currently TEN (The Energy Network) and Lincus

• AB32 implementation - GHG

emissions reduced to 1990 levels by 2020

• Use gas, get credits

for renewable energy

• Clean and sell gas
• Sell renewable energy credits
• DG export requires Natural Gas to

heat digesters to produce DG

Alternative Energy Opportunities

Digester Gas as Renewable Fuel

Alternative Energy Opportunities

Solar Energy

• Limited availability of
• pen land and roof space

– 1 megawatt requires 5 acres

• Cost and benefit

– 1 megawatt = $5 million, payback 15 years – Power purchase agreements are “Net Metered” – Variable output based on season & weather – Energy Storage coming into use

Alternative Energy Opportunities

Fuel Cells

• Emerging technology
• Low emissions
• High cost

1 MW = $5.2 million + $300K / yr

• More electrical efficiency than

engines; less heat output means boiler heat required for digesters

• Should be constant-loaded; abrupt

load changes & shutdowns shorten cell life

Renewable H2 Energy Station

Biogas Heat Power Heat (future) Fuel Cell

(Future)

Treatment Plant Hydrogen Fueling Station Solids Treatme nt Digesters Natural gas (backup) Efficiency:

• Target (electricity + H2) 50%
• Measured (electricity + H2) 53.2%

(July 2011)

• Measured (incl. heat value) >70%

• Digestion alternatives
• Increase gas production

– Technology: Cambi, aquacritox, and others – Supplemental fuels

• Monitor fuel cell and solar

advancements

What’s In The Future

Partnerships Matter

• Federal/state government –

DOE, USBR, EPA, DWR, CARB, and OCWD

• Private sector
• Utilities

Questions?

Umesh Murthy Orange County Sanitation District