Doheny Ocean Desalination Project Alternative Power Supply Analysis

Transcription

1 Doheny Ocean Desalination Project Alternative Power Supply Analysis CalDesal Conference - February 2018

2 South Coast Water District Created in 1932 Five-member Board of Directors Serves 40,000 residents 1,000 businesses Two million annual visitors Water and wastewater services to: Dana Point South Laguna Beach Areas of San Clemente Areas of San Juan Capistrano South Coast Service Area 2

3 Right now % reliant on imported water from the Metropolitan Water District of Southern California (MWD) Via the Municipal Water District of Orange County (MWDOC) Beginning to recover from five-year statewide drought Limited groundwater We are susceptible to earthquake-caused interruption SCWD 2015 Water Supply 13% Imported Recycled 87% Imported water from Northern California and the Colorado River becomes more unreliable as drought, growth and restricted pumping continue. 3

4 Efforts towards a balanced portfolio Conservation District customers are achieving 22% water conservation Over past 25 years, District s population increased by approx. 10%, but Potable Water Demands have dropped by 36% Daily Per Capita Potable Water Demand is currently at 131 gallons per capita per day (gpcd), compared to 2020 State target of 150 gpcd Groundwater Recovery Facility Currently operational, but was shut down for over 2 years due to basin stress Recycled water Aliso Creek Runoff Recovery & Reuse Project Recycled water system expansion 4

5 The Project Up to 15 MGD potable water Initial phase of 3-5 MGD Subsurface Ocean water Intakes Slant Doheny State Beach Desalination existing District property Product Water Conveyance Brine Discharge Via existing SOCWA Outfall Project Partners for 15 MGD 5

6 Estimated Power Consumption Desalination Plant Capacity Peak Operating Load (kw) Average Operating Load (kw) Estimated Annual Power Consumption (MWh/year) 5 mgd 3,900 3,100 27, mgd 7,450 6,200 54, mgd 11,000 9,300 81,000 6

7 Local Power Supply by SDG&E Current San Diego Gas & Electric Infrastructure can support up to 5 mgd facility (i.e. 4 MW) Any desal facility larger than 5 mgd would require additional electrical infrastructure by SDG&E, ~3 years to complete Underground Power Lines Laguna Niguel San Juan Capistrano 7

8 Alternative Power Supply Study Why consider alternative power supply? Overall Cost of Water Overall Project Reliability Environmental Stewardship 8

9 Impact of Power Cost Cost of Electricity at Start of Project ($/kwh) Cost of Doheny Desalination Project Water at Start of Project* ($/AF) $1241 (equal to projected MWD Rate) 0.10 $ $ $ $ mgd Project 30 year State Revolving Fund Loan, MWD LRP Rebate of $475/AF $10M DWR Prop 1 Grant Year

10 Improve Overall Project Reliability & Environmental Stewardship Multiple Sources of Power Improves Overall Project Reliability Electricity from the grid supplied by San Diego Gas & Electric Natural gas supplied to the site from Southern California Gas On site solar (beneficial but limited can only supply ~ 3% of phase 1 power demand) Offsite renewables wind/solar farms located in the desert, for example 10

11 Electricity and Natural Gas Supply SDG&E Service Area SoCal Gas OC pipelines 11

12 Off-site Power Supply Options Option Description Near Term Viability Direct Access Community Choice Aggregation (CCA) Allows for an end user to contract directly with a third party power generator. Power is distributed via existing utility network. DA under SDG&E is currently capped, and new subscribers are subject to lottery program. CCA may procure electricity on behalf of local citizens, businesses, and itself. There are currently no existing CCA programs in South Orange County. NOT Viable NOT Viable 12

13 Off-site Power Supply Options Option Description Near Term Viability Schedule RES-BCT Enables customers like the District to lower their energy bills by crediting one account with excess power generated from another account. Potentially Viable for less than 5 MW SB 1755 Wheeling Exemption With SB 1755, the District may not be constrained by the normal prohibition against wheeling power to itself using utility transmission and distribution lines. Specifically, can be used for desalinization operations. Viable 13

14 On-site Generation Available Footprint Approximately 15,000 sq. ft of available footprint for On-site Power Generation Equipment (in addition to solar panels on suitable flat roof space) 14

15 On-site Power Generation Options with Natural Gas Natural Gas would be used to generate electricity, which would power the Desal Facility Technology Pros Cons Internal Combustion Engines Reliable, Proven Technology Air quality/ permitting Turbines Proven and reliable Fuel Cells Lower emissions than combustion technology Lower efficiency than internal combustion Medium Maturity 15

16 Estimated Power Cost Estimated 20 year Estimated Additional Estimated Final Technology Levelized Generation Levelized SDG&E Levelized Cost to District Cost $/kwh Fees/Charges ($/kwh) ($/kwh) SDG&E AL-TOU NA On-Site Natural Gas Internal Combustion Engine On-Site Natural Gas Turbine On-Site Natural Gas Fuel Cell Offsite Solar Offsite Wind Highly Variable Highly Variable Waste-to-Energy Variable ( ) ( ) 16

17 Next Steps on Power Supply District continues to evaluate options with the end goal being some type of competitive procurement process 17

18 Example Draft Desalination Plant Rendering Thank You! 18