The University of Notre Dame is ready for the end of an era — one year ahead of schedule.

The school has used coal as an energy source since it opened in 1842. Monday, the last 10 tons of coal the school intends to burn were dumped to feed the campus power plant.

The idea to switch away from coal was inspired in part by a letter written by Pope Francis about taking better care of the Earth. The school has made strides in changing their energy infrastructure in recent years, part of an effort to cut Notre Dame’s carbon footprint in half by 2030.

This final coal delivery should be used up by the end of next year, according to officials at the school. The new energy configuration is also saving Notre Dame an estimated 2 million dollars per year.