Sunday night's powerful winter storm left about 20 Chicago Public Schools, but some parents said they were never notified of the problem. Debbie Knight, a parent at Wildwood Elementary School, said she brought her two children to school not knowing the power was out. Wildwood was one of the 20 CPS schools that lost power at some point because of the weather. North Grand High School on the West Side was another school that lost power, and used a generator for partial power.