DuPont Biofuels: Building a Sustainable Future September 27, 2007

DuPont Biorefinery Value Chain Carbohydrates to Chemicals and Biofuels Plant Feedstocks Biofuels Biochemicals Fermentation Processes Agricultural Inputs Conversion to Sugars Seed Crop Protection CO 2 Sugar Starch Ethanol Biochemicals Biobutanol Bio-PDOTM Cellulose Differentiated Products Biofuels Leveraging Relationships and Expertise Along the Value Chain September 27, 2007

Biofuels Global Market Perspective Current Biofuel Challenges: PIPELINE COMPATIBILITY BIOFUEL PRODUCTION PRODUCTION COST FEEDSTOCK AVAILABILITY REFINERY BLEND FLEXIBILITY TERMINAL FUEL STABILITY RETAIL / AUTO INDUSTRY / CONSUMER FUEL EFFICIENCY – MPG VEHICLE MODIFICATIONS INFRASTRUCTURE MODIFICATIONS September 27, 2007

Biofuels Sustainability: DuPont’s 3 Targeted Solutions Improving corn bushels per acre and ethanol gallons per bushel Seed/Crop Protection Solutions Supplementing ethanol by developing and supplying next generation biofuels with improved performance Advanced Biofuels with Improved Performance Developing and supplying new technologies to allow conversion of cellulose to biofuels Cellulosic Ethanol Production September 27, 2007

Advanced Biofuels – Preferred Attributes Infrastructure Challenges and Opportunities Uses existing biofuels value chain Is easily added to gasoline used in existing vehicles Is added to the fungible fuel pool using existing infrastructure to enhance sustainable growth Is used in reasonable blend concentrations and requires no compromise in fuel specifications Offers good value to consumers without performance compromise Enhances the use of incumbent biofuels September 27, 2007

Biobutanol: Next Generation Biofuel RENEWABLE FEEDSTOCKS WORLDWIDE FUEL MARKETS DuPont & BP Powerful partnership Shared commitment Global reach Complementary capabilities September 27, 2007

RETAIL / AUTO INDUSTRY / CONSUMER Biobutanol: Provides Greater Options for Sustainable Renewable Fuels PIPELINE BIOFUEL VALUE CHAIN REFINERY TERMINAL SAME AGRICULTURAL FEEDSTOCKS UTILIZE ETHANOL PRODUCTION ASSETS LIMITED WATER ABSORPTION FUNGIBLE BLENDING COMPONENT LOWER VAPOR PRESSURE AIDS REFINERS LESS CORROSIVE UTILIZE EXISTING INFRASTRUCTURE RETAIL / AUTO INDUSTRY / CONSUMER BETTER FUEL CONSUMPTION POTENTIAL FOR HIGHER BLEND LEVELS WITHOUT VEHICLE MODIFICATION LOW VAPOR PRESSURE ALLOWS FOR POTENTIAL INCREASE IN ETHANOL BLENDING PROMOTES USE OF EXISITING RETAIL PUMPS AND STORAGE September 27, 2007

Cellulosic Ethanol Production 40 Gal/Acre 391 Gal/Acre at 50% removal rate 155 Gal/Acre 310 Gal/Acre Images: www.ca.uky.edu & www.nativeaccess.com0 September 27, 2007

Cellulosic Ethanol Infrastructure Issues Conversion Pretreatment Enzyme Saccharification Cob Handling, Storage, Drying, & Transport Fermentation Production & Separation Feedstock ‘One Pass’ Harvest Cellulosic biomass to the plant gate : On-farm collection systems Moisture issues Storage Transportation Increasing yields / efficiencies Downstream Markets Same as ethanol Feedstock Production Government Support National Energy Agenda Incentives & Funding September 27, 2007

Corn Cob Collection / Processing Build on existing grain harvest system Why Cobs? 12-25% of the above ground stover 2 times the bulk density of stover 16% more carbohydrate than stover alone Collection options – one pass Separate or Grain/cob co-mingled “CCM” Separation options On farm processing Off-site processing Transportation and Storage options Future Visions September 27, 2007

DuPont Biofuels - Development Milestones 2007 2012 Seed & Crop Protection Solutions Best Corn Hybrids – Ethanol Yield (now) Direct processor – farmer connection (now) Increased Ethanol – other options (in development) Biobutanol Biobutanol market development launch in UK (2007) UK Development Plant (2009) Biobutanol Sales (2010+) Cellulosic Fuels Demonstration Plant (2008) Commercial Plant startup (by 2012) September 27, 2007

The Biotechnology Opportunity Meeting Food, Feed, Fuel, Materials Needs in a Safe, Sustainable Manner Thank you September 27, 2007