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2007 SCE Business Briefing
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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
2007 SCE Business Briefing Challenges Integrating Electric - - PowerPoint PPT Presentation
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
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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
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2007 SCE Business Briefing
Typical “Cooler” Summer Day Load Forecast
Today's Outlook
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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
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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)
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Generalized Combined Cycle Power Plant
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Mountainview Power Plant
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Mountainview Power Plant
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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
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Where is this place?
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The Bunker Hill Basin
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Bunker Hill Basin Info
- Sub-basin of the Upper Santa Ana Valley
- Surface Area of 89,600 acres (120 mi2)
- 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
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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
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2007 SCE Business Briefing
Filtercake Disposal Evaluation
- Risk management
- Long-term availability
- Costs
- Political/regulatory feasibility
– ClO4 Contamination Protection Act of 2003
- Proximity to MPP
- Implementation schedule
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Hauling and Disposal Estimates
Disposal Facility Mileage R/T Costs/Year Costs/30 yr. Lifetime Disposal Approval
Buttonwillow, CA (Hazardous) 370 $948,000 $28.44M Yes Buttonwillow, CA (non Hazardous) 370 $880,000 $26.40M Yes Beatty, NV 550 $921,000 $27.63M Yes San Diego, CA 210 $595,000 $17.85M No, but may be possible w/ negotiation Irvine, CA 98 $455,000 $13.65M No, but may be possible w/ negotiation Redlands Landfill (new facility dedicated to MPP) 4 Yes, after long negotiation
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2007 SCE Business Briefing
Perspective--MPP to Landfill
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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
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2007 SCE Business Briefing