Even if you have power a long distance away from the pond, and can trench in a buried air line you can get air to the pond. You can push air a long distance for far less $$ spent than it costs to bury electric.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).