Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, how many kilometres of transmission network were added to the electricity grid in the period (a) between 1994 and 1999, (b) between 2000 and 2009, (c) between 2010 and 2019 and (d) since 2019.

The Department does not hold historic data of annual transmission network build. As stated in the Electricity Networks Strategic Framework, in 2021 there were approximately 20,000km of onshore high voltage transmission cables in the UK.