Sprint is thinking outside of the box when it comes to backup power for it’s cell towers. Starting in 2005 Sprint has used Hydrogen fuel cells to backup their towers in areas that are prone to power outages. Currently, there are 250 Sprint towers that have been experimenting the fuel cells with more about to roll out.
Sprint claims that the fuel cells give them around 15 hours backup, with a recent grant from the government they will be pushing for 72 hours. In comparison a tradition diesel generator generally will run up to 8 hours. By 2017 Sprint would like to get 10% of it’s energy from renewable sources.