Energy? It is done by hand by a single guy for decades.
And I think you’re seriously overestimating the amount of water required to clean a couple hundred dollars in coins every week.
Uh. The St. Francis isn’t the Ritz Carlton. For SF, the rooms are pretty affordable.
And they use the change in the hotel bar.
Plus it isn’t just coins. St. Francis also gives brand new crisp bills for change that they order from Wells Fargo.