In the midst of rising energy prices, Congress sought to incentivize the development of alternative fuel systems. One major component of that incentive was the passage of the 2007 Energy Act. The 2007 Energy Act established the current Renewable Fuels Standard (known as RFS2) and categorized renewable fuels into four basic areas: conventional biofuels, cellulosic biofuels, biodiesel, and additional advanced biofuels.