MINNEAPOLIS — Natural grass won't be the only green part of Target Field, the new home of the Minnesota Twins. The ballpark has been awarded silver-level certification in Leadership in Energy and Environmental Design by the U.S. Green Building Council.

The Twins announced Thursday that their LEED score of 36 points is the highest for an outdoor baseball facility in the United States.

Nationals Park in Washington, D.C., which opened two years ago, scored 34 points.

High-efficiency lighting, a special rainwater filter system and recycled construction materials are some of the highlights of the Target Field project.

The LEED rating system was designed to emphasize projects that have less of an impact on the environment, are healthier for those who use the building and are more profitable.