Each year, the Sierra Club's magazine, Sierra, analyzes and rates national universities based on particular sustainability categories like food, transportation, and curriculum. This year, Arizona State University ranks 55 out of 162 universities. ASU shines in the curriculum, purchasing, and transportation categories, beating University of Arizona and Northern Arizona University. To be part of the annual rankings, university administrators are responsible for submitting answers to the Sierra Club's questionnaire, sharing accomplishments and methods on sustainability practices. To date, ASU generates a total of 20.8 MW of solar energy on all campuses and is developing a zero waste program with Waste Management. University employees and students are always finding ways to purchase sustainable materials and reuse supplies.