6 shafts are drilled close to the center of the earth.
In each of those locations a massive power generation station is built.
From there trough the shafts that have been drilled that offer access to the station, the power is taken to the surface trough a superconductor system of wires.
At the surface the power is passed to a massive tower that emits a huge WiFi power radious
Each of the 6 towers takes care of the power generation for a part of the world
In areas with difficult geography that can affect the WiFi power field the power can be bounced of satellites in earths orbit to assure power distribution to difficult locations.
Buildings and other things like cars, phones and other objects are equipped with WiFi power receivers and converters that ensure that they are constantly powered, eliminating the need for power plugs, or the worry of forgetting to charge your phone.