Wireless electricity - would have been free, but Nikola Teslas's sponsor withdrew financial support for the invention because
"where would we put the meter?".
Free electricity is not compatible with our present capitalist system (based on oil/gas)
Nikola Tesla - Wikipedia, the free encyclopedia
This video is long and very technical - the mention of free wireless electricity is at about 24 to 27 minutes in the video.
PS
http://en.wikipedia.org/wiki/Free_energy_suppression