There are examples of wireless recharging [1], and UAVs perching on power lines for recharging [2]. Apologies for the self-indulgent links -- I wrote the articles, so they were easy for me to locate. ;-)

[1] http://www.hizook.com/blog/2012/04/17/wireless-power-transfe...

[2] http://www.hizook.com/blog/2010/07/20/gliding-uav-perches-po...