Three fossil fuels—petroleum, natural gas, and coal—have provided more than 80% of total U.S. energy consumption for more than 100 years. In 2015, fossil fuels made up 81.5% of total U.S. energy consumption, the lowest fossil fuel share in the past century. In EIA’sAnnual Energy Outlook 2016Reference case projections, whichreflect current laws and policies, that percentage declines to 76.6% by 2040. Policy changes or technology breakthroughs that go beyond the trend improvements included in the Reference case could significantly change that projection.
In 2015, the renewable share of energy consumption in the United States was its largest since the 1930s at nearly 10%. The greatest growth in renewables over the past decade has been insolar and wind electricity generation.Liquid biofuelshave also increased in recent years, contributing to the growing renewable share of total energy consumption.
The most significant decline in recent years has been coal: U.S. coal consumption fell 13% in 2015, the highest annual percentage decrease of any fossil fuel in the past 50 years. The only similar declines were in 2009 and 2012, when coal fell 12% below the level in the previous year.
Some electric fuels, such as nuclear and hydroelectric, remain relatively flat in the Reference case, with little change in capacity or generation through 2040. Biomass, which includes wood as well as liquid biofuels like ethanol and biodiesel, remain relatively flat, as wood use declines and biofuel use increases slightly. In contrast, wind and solar are among thefastest-growing energy sourcesin the projection, ultimately surpassing biomass and nuclear, and nearly exceeding coal consumption in the Reference case projection by 2040.