I moved into a new apartment last year, served by a district energy utility. My winter electric heating bill went from $180/month to $40/month. And now I get

I moved into a new apartment last year, served by a district energy utility. My winter electric heating bill went from $180/month to $40/month. And now I get AC too. At a similar cost. Now, the new apartment has half the window area and is a bit closer to the ground. But still that is a huge saving. The utility's infrastructure serves about 25 blocks in a rapidly developing area. They use the "geothermal" constant ground temperature and natural gas heating. They've been doing this for about 6 years.