And there's no mention of the cost of the trash cans themselves. I've found that governments are fond of flouting operating cost savings while incurring massive capital costs.

For instance, my local transit agency purchased several hybrid-electric buses that cost $200,000 more each than a regular bus, but only improve fuel usage by 0.6 miles per gallon, saving at most a few thousand dollars per year. The agency of course pulled a full court press on how much fuel was being saved but wouldn't discuss the additional cost of the bus itself that made the purchase a complete waste of money.