HARVARD – A transformer was the likely cause of a power outage Wednesday that knocked out power at Harvard High School, as well as phone and Internet service districtwide.

The school lost power about 11:30 a.m. But because District 50 already planned to release students for a teacher institute day at 12:30 p.m., students were kept in their classrooms. The teachers who had training sessions at the high school were moved to other schools in the district.

“We got lucky on that aspect,” District 50 spokesman Bill Clow said.