Right now, due to contractual agreements, I have 8 servers with accompanying RAID arrays (this is new), two main PC's, two Macs, two laptops, three UPS (2 are new) and my electricity bill has gone up - the heat in my computer room alone has also gone up - during the Summer nonetheless.

It's not a massive amount adding to my bill - about 40-45 extra due to cooling costs too - but for a year, that's over 500.00 a year extra at this current rate. Perhaps Winter will require less heat though but right now we're looking at record temps here soon.

Keeping my machines on 24/7 - two main PC's and two Macs - really were offset the moment I rewired the majority of the house and used more "green" methods for external lighting and internal lighting - all florescent now - and my bill last year was 20-40 less a month. Once I get my solar panels up and fully running, and my windmill (yet to purchase), I anticipate another lowering of my bills perhaps.