The White House announced Tuesday it is inviting contract proposals from green energy firms to boost the Army’s use of renewable energy.

The administration is making $7 billion available for the U.S. Army Corps of Engineers to spend on locally-generated biomass, geothermal, solar or wind energy for up to 30 years.

The move is part of a broader White House-led push to green the armed forces, over GOP opposition, which claims the efforts are a waste of taxpayer dollars.

The Defense Department has set ambitious targets, aiming for renewable sources to account for 25 percent of its energy by 2025, with the Army working toward getting 1 gigawatt of power from green sources by that year.