Well in winter turn the heating off and use them so it'll work out as cost efficient!
Don't think folding uses more than a few mbs. Certainly doesn't take up much space on my ssd and doesn't interact with my hdds.
im also on a key meter, i have just got a power meter from local market will see the power usage its pulling
im with scottish power btw.
That's your problem. Think of the transport costs!
You must have calculated something wrong. Any other thirsty appliances?