Lost in transmission.
Power plants are often far away from residential homes, and between 7.2% and 7.4% of power on average is lost during the journey. In other words, 1 out of 14 units of power is a cost of convenience.
This is true if you live on the grid, anyway.
Transmission and distribution losses in the USA were estimated at 7.2% in 1995, and in the UK at 7.4% in 1998.
Electrical power is invariably partially lost during transmission. This applies to short distances such as between components on a printed circuit board as well as to cross country high voltage lines. Loss power is proportional to the resistance of the wire and the square of the current.
Thank you to Wikipedia for some interesting transmission data.
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