4. Assumptions
• GREET1_2013
» 2020 model year sedan
» Regulated mixes of fuel/feedstocks
» California mix of electricity in all pathways
• California mix of hydrogen
» 67% from natural gas (centralized and distributed)
» 33% from renewables
» 70MPa compression
9. Water life cycle assessment
• Blue water: fresh surface and groundwater
• Green water: part of rainfall on land
• Gray water: recycled
• Water withdrawal: amount of fresh water uptake from surface or
groundwater
• Water consumption: equals fresh water withdrawal minus fresh
water returned to the same withdrawal source
• Water LCA: accounts for fresh water consumption along the
pathway of producing the fuel from its feedstock source