Emerging Alternative Fuels
Several emerging alternative fuels are under development or already developed and may be available in the United States. These fuels may increase energy security, reduce emissions, improve vehicle performance, and stimulate the U.S. economy.
- Drop-In Biofuels
- P-Series Fuels
- Renewable Natural Gas (Biogas)
- xTL Fuels (Fischer-Tropsch)
Additional fuels used in limited quantities may meet the criteria for alternative fuels, including but not limited to ammonia, diethylene glycol dimethlyl ether (diglyme), and dimethyl ether (DME). More research is needed to characterize the impacts of these fuels, such as necessary vehicle modifications, required fueling infrastructure, human health impacts, greenhouse gas emissions, and tailpipe emissions.