San Diego County Water Issues 2010 Update

Maritime Business and Technology SummitNovember 16, 2010

Seawater Desalination for San Diego

Water Authority Background Wholesale water agency

created by state Legislature in 1944◦ 24 member agency water districts, cities

and one military installation: Camp Pendleton

◦ 36-member board of directors◦ Serves 3.2 million people and region’s

$174 billion economy

Service Area◦ 920,000 acres◦ 97% of county’s

population

2

5%

Regional Water Supply Diversification

3

Metropolitan Water District

Imperial Irrigation District Transfer

All American & Coachella Canal Lining

Conservation (per 2005 UWMP Goal + SBX 7-7)

Seawater Desalination

Local Surface Water

Recycled Water

Groundwater

2011 20201991

95%

23%

22%

6%

Dry-Year Water Transfers

7%

6%

9%

10%

17%

52%

12%

13% 3% 5%4%

11%

Why Desalination?

Water supply diversification

Climate-independent local water supply

Reduces reliance on increasingly constrained imported water supplies

Cost-competitive with other new supplies

Successful implementation worldwide

0 500 1,000 1,500 2,000 2,500

Camp PendletonDesalination

El Monte Valley IPR *

North City IPR *

Otay River

Mission Basin Narrows

$/AF

Marginal Cost of the Next Increment

of Local Supply (Actual Proposed San Diego Region Project Unit Costs)

Brackish Groundwater

Indirect Potable Reuse

Seawater Desalination

$1,717

$2,086

$2,190

$2,300

$2,340

* Cost of re-treatment not included

(2005$)

5

$1,900

(100 mgd) (50 mgd)

Seawater Desalination Process

6

50 mgd desalination project being developed by Poseidon

Project is fully permitted

Included in 2005 Water Authority Urban Water Management Plan

Water Authority would be sole purchaser of water

Term Sheet between Water Authority and Poseidon approved by the Board on July 22

Risk transfer to Poseidon

WPA pre-negotiation activitiesunder way

On-line in 2013

Carlsbad Desalination Project

7

Proposed Camp Pendleton Desalination Project

8

Proposed project is a 50 -150 mgd desalination project

Construct in phases over time

Located in the sw corner of Camp Pendleton

MOU executed with Marine Corps to continue with planning/technical studies

New intake and discharge infrastructure required

Next phase of study under way

Earliest on-line date is late 2020

9

9

Rosarito Desalination PlantFeasibility Study

Colorado River water supply augmentation

Completed Feasibility Study (Phase 1)

No Fatal Flaw Found Environmental Permitting would be

challenging

Next Phase (Phase 2)

Detailed site analysis, conveyance alternatives, refine cost estimates and review product water exchange w/ MX

Decision on whether to pursue Phase 2 expected this year

Otay Water District also pursuing a similar project at the power plant site

ROSARITO POWER PLANT

Desalination Technology Innovation on the Horizon

Expanded use of large diameter RO membranes Continued improvement in RO isobaric energy

recovery

Application of nano-technology to RO membranes

Use of renewable energy generation for desalination Ocean-related energy technologies Osmotic power (related application)

10

Questions?

11