Aye, I agree. A 15kW generator is pretty big, and if you end up running that thing at even 75%, you're going to be toying with a LOT of electricity. 12,500 watts is no joke, and can lead to serious injuries/death for someone who doesn't know much about "electrical stuff."

On top of that, a 15kW diesel generator running at 75% capacity will burn fuel at a rate of about 1.3 gallons per hour. Obviously this will be more if it's at full-load. Price per gallon of diesel is currently hovering around $4.15-$4.50 a gallon in the U.S. (Not sure what it is in Canada.) We'll round down to 1gal/hour and say $4.50 per hour x 12 hours per day = roughly $54 per day. At 18 hours it would be $81 per day. You can see how expensive this would become after continuously being used, plus remember, we rounded down and only estimated usage at 75%!

If you've got that kind of money to spend, maybe you should think about hiring a contractor to do the electrical work for you. Just a thought.