The University lost more than 100 trees during Superstorm Sandy, including the one ­pictured at right near Alexander Hall, but only minor structural damage was reported. The storm arrived Oct. 29 during fall break, when about 1,200 undergraduates were on campus; most lost electricity for only a few minutes as the University switched to power produced by its cogeneration plant. University buildings that depend on electricity from the public grid lost power for several days, however, including ­graduate-student housing at the Stanworth and Butler apartments. Students organized relief efforts, including a drive to gather food, clothing, and toiletries for storm victims.