By Anmar Frangoul, CNBC News.

The clean energy industry in the U.S. employs over 2.5 million people, according to new analysis released by Environmental Entrepreneurs (E2), a nonpartisan business group.

The findings in a report, "Clean Jobs America", show that the energy efficiency sector employs 1.9 million Americans, with other sectors such as solar and wind accounting for 299,000 and 77,000 workers respectively.

"In a short amount of time, clean energy has become a huge part of our workforce and our economy," Bob Keefe, executive director of E2, said in a statement.