Electricity cost for R710 servers with dual PSU's

I had a question about power usage on R710 rack servers.  I'm running two R710's each with dual power supply units: 870w x 2 and 870w x 2

It's come to my attention this might be costing more than I anticipated each month.  I setup Grafana to monitor one of them and grabbed a power dashboard that someone else created.  I entered my electricity cost into the dashboard and come up with the following numbers.  Does this seem accurate to you all?

I was thinking about only running one PSU in each rig but I am not sure that will actually save any money?  Also, I have a few other servers I would like to spin up but I want to keep an eye on the electricity costs.  If anyone has any input on this I would love to hear from you.  Thanks!