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Today’s Agenda Recap of Chariton Valley Biomass Project (Iowa) Structure Challenges Lessons learned How to Achieve Similar Success in Wisconsin Biomass supply Bio refinery Bio-power plant Alliant Energy’s Renewable Energy Portfolio Chariton Valley Biomass Project Chariton Valley Resource Conservation and Development received Dept. of Energy grant in 1994 Approached Alliant Energy-Interstate Power and Light Co. about burning switch grass with pulverized coal in 1995 Other partners include: USDA, National Renewable Energy Laboratory, Prairie Lands Bio-Products, Iowa Department of Natural Resources, Iowa State University, Iowa Farm Bureau Federation, Iowa Energy Center Alliant Energy’s Role Designate Ottumwa Generating Station as project test site Provide environmental management/support Over 5,000 labor hours from IPL employees Provide technical support to: Develop processing facility design Design/execute necessary modifications Conduct test burns and compile data Challenges for Alliant Energy OGS is base load plant Boiler not designed to burn switch grass; could affect reliability Co-fired fly ash might not meet Iowa DNR standards for road construction The Role of Prairie Lands Biomass, LLC Identify and develop switch grass products and markets Produce, harvest and deliver switch grass to satisfy demand Evaluate environmental benefits of producing and using switch grass Inform and educate the public about switch grass’ potential First Test Burn November 30, 2000 – January 25, 2001 Burned 1,269 tons of switch grass (at rates up to 16.8 tons per hour) Primary goals: Identify effects of co-firing on boiler performance Measure changes in emissions during co-firing Gather information to improve the design of switch grasshandling equipment Second Test Burn December 2003 (2 weeks) Burned 781 tons of switch grass (at rates up to 8.9 tons per hour) Improved switch grass-handling system was used Primary goals: Verify air emissions Obtain large samples of co-fired fly ash for testing Further analyze the technological feasibility of switch grass cofiring Third Test Burn February – May 2006 (1,700 hours) Burned more than 15,000 tons of switch grass Primary goals: Refine switch grass processing system Secure certification of renewable energy credits through Environmental Resources Trust Finalize steps necessary for commercialization Switch Grass Processing Facility Construction of facility and technical refinement of processing system essential to achieve commercialization How Does the Process Begin? Removing Twine Prior to Processing Preparing Switch Grass for the Boiler How Switch Grass Enters the Boiler Maintaining Co-Fired Fly Ash Certification Recognized national leader in coal-combustion product re-use Annual sales: $3 million Where is Chariton Valley Biomass Project Today? Moving toward commercialization of the process Analysis of final test burn expected in May 2007 Initiate contracts for switch grass supply Achieving Similar Success in Wisconsin What will it take? Formation of a growers’ association Change in CRP rules Establish new policies Guidance, financial incentives from USDA, others Achieving Similar Success in Wisconsin It will require: 1. Biomass materials supply 2. Bio-fuel refinery 3. Bio-power plant To deliver these functions: 1. Biomass to bio-fuel refinery 2. Biomass to bio-fuels 3. Bio-fuels to electricity Alliant Energy is committed to developing bio-power at Nelson Dewey Bio-Based Materials Under Consideration WPL initial conceptual design “Woody” biomass Switch grass WPL currently investigating potential use of these materials: Other “grasses” Hay Straw Corn stover Wood forest residues Other wood varieties (Poplar, Willow, Bark) Co-Firing Switch Grass at Nelson Dewey How many tons of switch grass would be needed to supply Unit 3? Manufacturer design for 10% biomass 100,000 tons per year Unit 3 bio-power target at 20% or more >200,000 tons per year Potential Switch Grass Production How many acres of switch grass will be needed? Manufacturer design for 10% biomass 33,000 acres per year @ 3 ton per acre yield 25,000 acres per year @ 4 ton per acre yield Unit 3 bio-power target at 20% or more >66,000 acres per year @ 3 ton per acre yield >50,000 acres per year @ 4 ton per acre yield Nelson Dewey Generating Station Cassville, Wis. Today Unit # 1 100 MW Built in 1959 Unit # 2 100 MW Built in 1962 Nelson Dewey Generating Station Cassville, Wis. Tomorrow Unit # 1 100 MW Built in 1959 Unit # 2 100 MW Built in 1962 Unit # 3 300 MW in 2012 Bio-power capable Bio-fuel permitted Hurdles to Overcome: Bio-Based Fuel Supplies Biomass Materials SUPPLY Functions Growing Harvesting Storage Biomass material quality control Transportation to processor Hurdles to Overcome: Bio-Based Fuel Supplies Biomass Fuel REFINERY Functions Aggregation Processing into fuels Bio-fuel quality control Biomass fuel storage Delivery Developing Bio-Power at Nelson Dewey Unit 3 bio-power design requirements based on: Identification of regional biomass material types Specific biomass material characteristics Heat content Moisture level Ash content Specific biomass material chemistry Alkali levels Chloride levels Developing Bio-Power at Nelson Dewey Biomass fuel USE design issues to resolve: Reduced to power output levels Reduced combustion efficiency Alkali and chloride impacts Increased boiler fouling Increased boiler tube corrosion Reduced availability Developing Bio-Power at Nelson Dewey Alliant Energy targets for Unit 3: Expand manufacturer designs for up to 20% or more biomass Expand bio-fuels beyond wood and switch grass Increase bio-fuels types and percent in air permit 2007, if possible In the future, if architect and boiler manufacturer require time Design of bio-fuel systems with architect and manufacturer Developing Bio-Power at Nelson Dewey For newer and larger 300 MW circulating fluidized bed units: Manufacturer designs are for up to 10% biomass capability Unit 3 air permit applications now include: 10% Woody biomass 10% Switch grass Unit 3 design includes area designated for bio-fuel handling Equipment design will occur after selection of: Architect / Engineer Boiler manufacturer Achieving Similar Success in Wisconsin It will require: 1. Bio-power plant 2. Bio-fuel refinery 3. Biomass materials supply Bio-power success requires local leadership to supply biomass materials and bio-fuel refining Existing Bio-Fuels Advantages Water quality Soil quality Habitat improvement Local economic opportunities Additional Air Quality Benefits of Co-Firing Switch Grass Lower fuel sulfur levels Equal or lower fuel nitrogen levels Equal or lower fuel ash levels Reduced carbon footprint Nelson Dewey Air Permit Co-Firing 10 % Switch Grass or Wood Nelson Dewey 3 Air Permit Application Specifying 10% biomass identified as: Switch grass or Wood For More Information… www.cvrcd.org www.alliantenergy.com Kim Zuhlke, Vice President-New Energy Resources email@example.com or 608.458.5747 Kirby Letheby, Team Lead-New Generation firstname.lastname@example.org or 608.458.3276 QUESTIONS ?
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