I was worried about the power usage when I first started using my old gaming CPU for a home server (i7-4770k). I bought a kill-a-watt, ran it plugged into that for a month, saw that it was using pennies worth of energy per month and never worried about it again.

Unless you’re pegging the CPU at 100%, it’s not going to be pulling the full 65W. As far as maintenance fees go, the cost of replacing a single hard drive will likely overshadow your energy costs.

Pro tip: keep an eye out for hard drive deals on black fri. And I recommend doing a burn-in run on any new drives when you get them to push them past the initial failure window of the bathtub curve (I used badblocks. Took nearly a week for the initial run, but I found one bad drive and was able to RMA it immediately instead of finding out the hard way).