Well consumption was pretty clear, considering having a 800W power supply on the desktop  if it Runs high on 500w  for 6h you used up 3kwh for sure. I made a measurement just for the time working with superfly in total it was in the afternoon a little more then 4h then continued from 1 am to 4 am another 3h most of the time it was rendering for testing the setups 3 Kwh puff and 5 test renders that could be half way usable. so in total it was a little longer then 7h computer just for superfly. when using the computer with a little firefly and other works through 24H I usually get a max of 1 kwh consumption ! 

But it is up to any individual to decide weather it is worth or not, free for anyone how he is using the tools. Gaming can also cause peaks so not problem with that. For me it is sure not worth it as I got a cheaper alternative with firefly.