wireless electricity

you mean energy transfer using air as a medium?

Yes,

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1. Wireless energy transfer - Wikipedia, the free encyclopediaOn the other hand, Tesla's concept of a combined global wireless electrical power transmission grid and telecommunications network based upon energy ...
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2. Electric power transmission - Wikipedia, the free encyclopediaIn the United States and parts of Canada, electrical transmission companies operate .... Another form of wireless power transmission has been studied for ...
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3. TED Blog: Wireless electricity demo: Eric Giler on TED.comAug 25, 2009 ... Wireless electricity demo: Eric Giler on TED.com. Eric Giler wants to untangle our wired lives with cable-free electric power. ...
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4. Video: Wireless Electricity Transmission Via Tesla Coil » The ...Apr 29, 2009 ... Video: Wireless Electricity Transmission Via Tesla Coil on The UberReview.
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5. Is wireless electricity transmission possible? - Yahoo! AnswersAs per the great inventor Nikola Tesla, wireless transmission electrical ... Of course it is. It is done all the time at Iofe Institute in St. Petersburg Russia ...
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6. Wireless transmission of electricity16 posts - 8 authorsWireless transmission of electricity Electrical Engineering.
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7. Directory:Wireless Transmission of Electricity - PESWikiWireless transmission of electricity, Tesla style, would have circumvented the metering of energy, abundantly available. That is why J.P. Morgan took the ...
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8. The Wireless Transmission of Electrical EnergyA FEEDLINE newsletter article about Nikola Tesla's wireless system and the possibility of its use to transmit electrical power in industrial quantities.
   

To transmit or send useable electrical power from one point to another in air or space without conductors is not practical and is very inefficient.

If I want to send say,50 watts of electrical power from my house to my garden to light up a bulb without wires;for the energy to leave/radiate from my house I will have to convert the 50W to ultra high frequency electro-magnetic wave or short wave length lightwave or lasser beam or electro static charges (like lightning) and focus it to a receiving arrangement (forget about the safety aspect) and convert it back to useable electrical power,50W for the bulb.In this process I will have to waste more than hundreds of KW to make it happen.So, it is definitely not a vaible obtion now.

Converting coal's thermal energy to steam energy with a simple steam boiler, the efficiency is about 12%.From steam to turbine and alternator and transmission (6% for voltage step up and down plus line losses) there are more losses( I do not know the typical efficiecies such mechines).From sun light to electricity is about 16-17%.It is at such great expence for us to receive every watt of electrical energy that we should not spend it wastefully.

However I think it is somewhat practical to have a small area such as a table/work bench or factory floor embedded with induction coils that transfer electrical energy through small air gaps to induction coils under your laptop computers,handphones,LED table lights,radio and other small power devices.How about induction coils in the mattress to charge up the batteries of heart pacemaker inside the patiens?Take it further and apply it on Erectile dyfunction cases ( 50 Hz is definitely too fast!).

Have fun and regards,

Khor.