Use the public gym. . . outdoors!

I don't have any stats on the typical electrical bill of a gym, although there are those gyms that are doing their part to offset like the one in Seattle, but if you think of the treadmills, ellipticals, showers, hair-dryers, fans and sound systems that is a lot of juice!
Now that the snow has left and weather is nice most everywhere consider moving your workout outside. Run, walk, or bike to and from work, go hiking or climbing on the weekends, and enjoy exercise without the guilt.