The White Mountain School in Bethlehem beat almost three dozen other boarding schools in the Northeast in a recent competition to reduce electrical use.
The schools were competing in the national 2012 Green Cup Challenge, in which 116 schools in 22 states competed.
Students at The White Mountain School relied on conservation tactics ranging from unplugging chargers to turning off lights, said Elizabeth Aldrich, the chair of sustainability studies at the school.
Over four weeks the school reduced its use of electricity by 15.8 percent, based on a reading of electric meters.
The top-rated school nationally was St. Andrew’s School, Florida, which reduced its use of electricity by 32 percent.