2007 SCE Business Briefing Challenges Integrating Electric - PowerPoint PPT Presentation

2007 SCE Business Briefing Challenges Integrating Electric Generation and Potable Aquifer Usage/Restoration: The Water- Electricity Nexus September 2008 David Asti, CPG 9044 Manager, Corporate Environmental Policy Southern California Edison

2007 SCE Business Briefing Outline • Context: Energy Needs vs. Water Supply • Overview of Steam Generator Needs • Mountainview Power Plant (MPP) as a case study • Waste Disposal Issues • Project Benefits 2

2007 SCE Business Briefing California ’ s Electricity Issues • Barely adequate supply (45,000+ MW needed for hottest summer days) • Conservation techniques help, but... • Transmission & Distribution infrastructure needs to be upgraded (not just a CA issue) • Availability of imported power declining • Existing base load plants aging and inefficient • Increasing demands – Population increase of 12 million by 2020 – Most growth in hotter inland areas 3

2007 SCE Business Briefing Typical “ Cooler ” Summer Day Load Forecast Today's Outlook 4

2007 SCE Business Briefing So Cal Water Resource Limitations • Climate is predominantly semi-arid to arid • State water policy – strongly discourages use of fresh water for power plant cooling – promotes water conservation • Federal and state limits on wastewater discharge 5

2007 SCE Business Briefing Typical Power Plant Water Challenges • Gas-fired steam power plants require ~4-6,000 acre-ft/year per 1000 MW for wet cooling (MPP ~6,000 gpm at full load) • High ambient temperatures during peak demand • Alternatives? – Dry cooling technologies inefficient during high temperatures – Once-Through Cooling volumes unavailable in inland areas (§316(b) of CWA) 6

2007 SCE Business Briefing Generalized Combined Cycle Power Plant 7

2007 SCE Business Briefing Mountainview Power Plant 8

2007 SCE Business Briefing Mountainview Power Plant 9

2007 SCE Business Briefing Mountainview Power Plant • New base load power plant • Water supply: – 50% groundwater (Located in Bunker Hill Basin) – 50% Title 22 reclaimed wastewater • Wastewater treatment – Two-pass reverse osmosis – Precipitation • Wastewater disposal – Industrial brine line – Landfill of water treatment filtercake 10

2007 SCE Business Briefing Where is this place? 11

2007 SCE Business Briefing The Bunker Hill Basin 12

2007 SCE Business Briefing Bunker Hill Basin Info • Sub-basin of the Upper Santa Ana Valley • Surface Area of 89,600 acres (120 mi 2 ) • Holocene & Pleistocene alluvial deposits • Largely sand, gravel, & boulders; some silt • 3 aquifers (lower, middle, upper) • Well yields up to 5,000 gpm (1,245 avg.) • About 24,000 AF natural recharge + 15,800 AF of artificial recharge

2007 SCE Business Briefing Waste Management—Two Streams • Wastewater (300 gpm) discharged to industrial brine line that drains the Inland Empire • Water Treatment filtercake – Landfilled – Class II designated waste – SCE/City of Redlands cooperative project to double-line landfill 14

2007 SCE Business Briefing Filtercake Disposal Evaluation • Risk management • Long-term availability • Costs • Political/regulatory feasibility – ClO 4 Contamination Protection Act of 2003 • Proximity to MPP • Implementation schedule 15

2007 SCE Business Briefing Hauling and Disposal Estimates Disposal Facility Mileage Costs/Year Disposal R/T Approval Costs/30 yr. Lifetime Buttonwillow, CA 370 $948,000 Yes (Hazardous) $28.44M Buttonwillow, CA 370 $880,000 Yes (non Hazardous) $26.40M Beatty, NV 550 $921,000 Yes $27.63M San Diego, CA 210 $595,000 No, but may be possible w/ $17.85M negotiation Irvine, CA 98 $455,000 No, but may be possible w/ $13.65M negotiation Redlands Landfill (new 4 Yes, after long facility dedicated to MPP) negotiation 16

2007 SCE Business Briefing Perspective--MPP to Landfill 17

2007 SCE Business Briefing Project Benefits • Efficiently provide power to Californians – Efficient use of fuel – limits greenhouse gases – Efficient use of water • Expedite remediation of aquifer – Removing perchlorate • Protection of aquifer – Use of reclaimed wastewater – Double-lined landfill 18

2007 SCE Business Briefing Thanks for your attention; any questions? 19