Los Angeles Department of Water and Power

Seawater Desalination Updateby: Alvin Bautista, P.E.

October 2007

• MWD has included desalination in its Integrated Resources Plan - $250/AF incentive offered

• LADWP began evaluations in 2002 (Fatal Flaw Analysis, Optimization Study, Brine Discharge Analysis, incl. use of Hyperion outfall)

• Due diligence requires a site-specific evaluation through detailed pilot testing at the Scattergood site

• Water System is conducting a small-scale pilot project at Scattergood to evaluate various parameters

Seawater Desalination Update

• Pilot project focus is on data and information collection (to provide answers that can serve as basis for future decisions)

• Grant funding from the Bureau of Reclamation and Department of Water Resources (Proposition 50) acquired to fund approx. 50% of the pilot project’s costs

• Pilot will be conducted in a manner that will not solely depend on power plant remaining in service

Seawater Desalination Update

LADWP Proposed Desalination Project Site

• 85% of Los Angeles’ water supply is imported

• 40% of Los Angeles Aqueduct water has been redirected for environmental restoration

• City population expected to increase by 370,000 to over 4.3 million residents by 2025

• Continuous efforts in recycled water supply development

• LADWP success in water conservation has kept demands low and imported supplies sustainable

Seawater Desalination and City of Los Angeles’ Water Resources

Seawater Desalination and City of Los Angeles’ Water Resources

Local Wells11%

Conservation18%

MWDWater

Purchases36%

Recycled Water

1%

Los Angeles Aqueduct

34%

Los Angeles Aqueducts

36%

MWD23% - 40%

Existing/Planned Recycled Water

4%

Other Planned Supplies

7%

PotentialLocal Resource

Development10%Local Wells

13%

Potential Additional

Conservation7%

• 85 percent of Los Angeles’ water supply is imported

FY 06-07

2030

Seawater Desalination and City of Los Angeles’ Water Resources

• 40% of Los Angeles Aqueduct water has been committed for environmental restoration

DECLINING LOS ANGELES AQUEDUCT

DELIVERIES

375,000

260,000

85,000

16,000

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

450,000

500,000

Before

Acr

e-F

eet

Mono Basin

Owens Valley

Today

184,000 AF reduction =40% of historic supply

0

100

200

300

400

500

600

700

800

900

1000

70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06

Fiscal Year

Ac

re-F

ee

t x

1,0

00

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

Po

pu

lati

on

x 1

,00

0,0

00

Actual WaterDemandPopulation

CONSERVATION’S IMPACT ON CITY OF LOS ANGELES WATER

USEWater use is the same today as it was 25 years ago despite an increase in population of nearly 1 million people.

Seawater DesalinationOpportunities

• Work cooperatively - regional and statewide to develop a new local resource

• Develop an objective process for permitting future local facilities

• Provide water supply reliability through a drought-proof supply

• Improve technology through more R&D: gain efficiency and reduce cost

• LADWP is evaluating desalination as a potential water resource to provide reliability and partly compensate for supplies reallocated to the environment

• The pilot research project at Scattergood will provide needed data and information that can be used to make future informed decisions

• The pilot project will evaluate the most feasible options for developing desalination

Summary

• Beyond the pilot research study, no decision has been made on the future of seawater desalination for Los Angeles

• LADWP is now undertaking prudent research and has initiated dialogue with stakeholders

Thank you.

Summary