Washington University’s annual Green Cup competition is only halfway over, but the organizers are already seeing a noticeable difference in students’ energy consumption on campus. The competition, which has two categories—residential life and Greek life—already has frontrunners.

The Green Cup, a student-organized sustainability competition, will pit Residential Colleges against one another in an effort to reduce electrical energy usage. The contest will take place simultaneously among fraternity houses. Students will be able to track their progress in real time through the competition’s website, greencup.wustl.edu, which goes live Monday.