Energy conservation was drilled into Habitat High students Thursday during the first class of the initial Green Technologies Training Program. The students are part of a Habitat for Humanity of Hall County program that gives those who have excelled in construction class the opportunity to work on-site building a house during the school year. Students in construction classes from county high schools, including Johnson, West Hall, Flowery Branch and Chestatee, also will attend the daylong training over the next two months.