New federal buildings must be at least 15% self-sustaining by means of solar or wind energy. Made so by executive order. Examples could include: solar panels on the roof of new federal buildings, wind turbines, solar water heaters or a combination including energy efficient building techniques to reduce overall consumption like white roof materials or energy efficient lighting or natural light.
This like a federal contractor minimum wage raise will show that the government will lead by example, with or without congress. This will also be fiscally conservative because it will save taxpayers money on government utility usage and decrease pollution while encouraging job growth in the energy market.
This will bolster the economy, environment, and decrease government spending.