An example of a rack that holds photo voltaic panels. Similar racks are planned to go in the parking lots of Hosmer and Cunniff schools in an effort to generate electricity. Architects designing Watertown’s new elementary schools are searching for enough space to place solar panels to make them net zero energy schools, however the biggest challenge to meeting the energy efficiency mark could be the project budget. Scott Dunlap, project architect for the three elementary school projects, showed the School Building Committee plans for Hosmer to place enough photo voltaic panels to cover the school’s energy use, while at Cunniff architects still need to find space for more panels. Lowell School will be renovated, so designers are not seeking to make the school net zero.