Mayor Greg Fischer unveiled two green projects on Monday built with federal stimulus funds, continuing toward his goal of making Louisville a leader in energy efficient business.The first project was an energy efficient green roof for the Romano L. Mazzoli Federal Building. The $1 million dollar project is the largest green roof in Kentucky, covering 24,000 square feet, said Fischer. It features a process that collects rainwater and repurposes the runoff to water plant beds below.“It was beautiful to see the effectiveness of the roof. These are wonderful ways to demonstrate how dollars can be used smartly,” said Fischer.Later on Monday, Fischer was joined by Congressman John Yarmuth, D-3, in announcing a new $4.5 million energy efficient TARC facility. The facility is used for maintenance and training and uses solar and natural lighting to power buses instead of having them idle, using fuel and costing money. Fischer said these projects are an investment.“Sometimes in the private sector people say the payback’s not there--they’re looking at a short period of time, three years or five years,” he said.But it will take more time to see the effects, said Fischer.Yarmuth touts the project as a good response to some of the problems in Congress.“As you’ve no doubt heard there’s been a lot of talk about cutting spending, reducing waste and most importantly creating jobs. Given the dysfunction in Washington right now those might seem like tough goals to achieve. But the truth is right here we’ve done each of these things and more,” he said.The new TARC facility is expected to save around 30 percent of its energy cost, said Yarmuth. TARC also announced a new route its buses will take out of the terminal. The route will save time, create less traffic, and save around $100,000 in fuel costs.