Aaccording to Treadmills USA the average treadmill uses around 1500 watts — the equivalent of 15 of those old-fashioned light bulbs we’ve all chucked this week. So, over 30 minutes, you use .75 kilowatt-hours (logic= 1.5 kw x 0.5 hours) — the same amount you’d use to light up your Christmas tree for six hours. (To check out the amount of electricity you use for appliances, check here.)
avoid using that.
– from http://thestar.blogs.com/thegreenlife/2008/01/treadmill-thoug.html