The University of Iowa campus has a steam system under the campus, installed in the last century. Nowadays the steam is recovered waste from the electric plant. But it's still in use!
If you want to find good candidates for saving the campus tons of money, go to the roof of one of the tallest buildings on a cold day and look for the buildings that are venting lots of steam. They likely have a failed steam trap somewhere in the building. It's not uncommon for failed steam traps to save thousands of dollars a year apiece when fixed.
