this power back to the local grid for the most efficient use system wide. In late 2011, Carleton installed a second wind turbine that provides power directly to the campus, providing more than 25 percent of the college's electrical energy use.
Three different geothermal bore fields are on campus, underneath two of the main green spaces and Bell Field.
== Athletics ==
The Carleton athletic teams are called the Knights. The college is a member of the NCAA Division III ranks, primarily competing in the Minnesota Intercollegiate Athletic Conference (MIAC) since the 1983–84 academic year; which they were a member on a previous stint from 1920–21 to 1924–25. The Knights previously competed in the Midwest Conference (MWC) from 1925–26 to 1982–83; although Carleton had dual conference membership with the MWC and the MIAC between 1921–22 and 1924–25.
All students must participate in physical education or athletic activities to fulfill graduation requirements.
=== Rivalries ===
Carleton's biggest athletic rival is …
