Casa Grande elementary schools looked like energy gluttons compared to other U.S. schools in 2008. The average on the Energy Star rating scale, which runs from 1 to 100, was 50. Casa Grande Elementary District schools averaged 7.58. Cactus Middle School and Saguaro Elementary School each scored a 1. The more energy efficient the school, the higher the number .By Oct. 7 of this year, the average of the district's schools was slightly better than the national average at 50.42.