Electric-power transmission is the bulk transfer of electrical energy, from generating power plants to electrical substations located near demand centers.
This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution.
Transmission lines, when interconnected with each other, become transmission networks.
Energy which is generated must be transported to the end user. This transportation takes place in power lines which will run over the landscape. Continued economic generation in the region and increased consumer demand for electricity will mean the construction of additional power lines across the landscape of the flyway. The total length of transmission and distribution lines worldwide is expected to rise from 70.5 million kilometres at the end of 2010 to 76.2 million kilometres by 2015. Across North Africa and the Middle East thousands of additional kilometres are expected.