For a pond across the road you can check with the local utility and they will often put a wire drop and meter for low cost. An elecrician (or friend electrician) can wire up a pole and plug at the meter base. IMO Electrical aeration in a 0.25 ac pond is cheaper (esp DIY), more dependable, and in the long run more efficient than a windmill. For a windimill plan on $1500.00 with regular maintenance of changing the diaphragm every 1-3 yrs 12-20 ft in the air. Also plan on replacing bearings which are a real pain every 10-15 yrs. A windmill without lots of wind from at least 3 directions is IMO pretty much a waste of money. A windmill not turning frequently in Jul-Aug (calm dog days) is not much pond aeration when the pond usu needs the most aeration.
I have seen Good electric aerators ($450-1000 - rotary vane) in operation for 20 yrs and only maintenance has been occassional change of air filter and checking & cleaning of the diffuser which should be done with windmill or electric. These pumps are getting due for a vane change rebuild which can be done quickly and simply on the work bench. Your small pond should not need constant 24/7 aeration - IMO 4-6 hrs /day (Apr-Oct) will keep it well circulated as evidenced by numerous aerators in small ponds in my NW OH region.
The pond will not need aeration but it will stay in better overall "condition" with fewer problems and age slower if it is aerated. Aeration will also improve the fishes but exactly how much improvement is still not a definate number.
http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Number=202413#Post202413There are numerous OH pondowners here, several of them in SW OH area. They can lend opinionated support to your project.
PS - Welcome to this The Pond Boss Forum. How did you find us?