Well if I only had a few miners, some friends, exercise bikes, an alternator and a few batteries I could use it as a temporary power source to save some electricity.

Power the batteries to full charge, mine with it, exercise a bit to get some more hours, switch back to paid electricity, repeat.

It's something at least haha.

I may just try this for fun.
 Maybe get 4 or 5 100 amp hour car batteries for 4000-5000 kwh.

Just take a few regular bikes and take the wheels off, have the front sprocket about 10 times less teeth then the rear sprocket for speed.
Have that spin a homemade generator (basically magnets moving across some wire coils) and power the batteries.

Hook it up to an ant s3 for a while and see if I can get it to work.