We use RoyalTS and I've been very happy with it. I've used mRemoteNG and Mobaxterm in the past, and there really isn't much that would have me switch back. Plus, it supports plenty of other protocols besides SSH, so more of our teams can leverage it.
Between 3 switches, 4 servers, and my desktop also using one of my UPS units, I average about 850w, with peaks up to 1.1kw when my desktop is running. Luckily, electricity where I live is only 13cents/kwh.