Fuel-Cycle Energy and Emissions Impacts of Fuel Ethanol

Table of contents

Fuel-Cycle Energy and Emissions Impacts of Fuel Ethanol

Total energy cycle includes fuel cycle and vehicle cycle

Slide 3

The Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREET) model

Key parameters that determine fuel-cycle energy use and GHG emissions of corn ethanol

Historical corn production per pound of fertilizer used (3-yr moving average, based on USDA data)

Technology is improving energy use intensity of ethanol plants

Up-stream energy and emissions allocated to co-products varies by allocation method

Key parameters that determine fuel-cycle energy use and GHG emissions of cellulosic ethanol

Base values of key parameters for biomass farming: per dry ton of biomass

Parametric assumptions for current, near-future, and future cases

Ethanol energy balance: Btu in a gal of ethanol minus Btu required to produce it

Effects of ethanol blends: per-mile petroleum use changes (% relative to gasoline)

Effects of ethanol blends: per-mile fossil energy changes (% relative to gasoline)

Effects of ethanol blends: per-mile greenhouse gas emissions changes (% relative to gasoline)

Per-gallon ethanol effects: greenhouse gas emissions changes (% relative to gasoline)

Per-mile changes in greenhouse gas emissions: near-term cars (relative to Tier 1 GVs)

Per-mile changes in greenhouse gas emissions: long-term cars (relative to Tier 2 GVs)

Summary

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