Where works are necessary on the electricity transmission network we will always explore options to obtain more capacity from the existing system, before looking to expand it.
For example, by installing new plant in our electricity substations and developing new conductor systems for use on our existing overhead lines, we can often cater for increasing demands upon our network without the need for major new developments.
Planning requirements for electricity equipment and related works
When National Grid needs to build new electricity lines or substations, a number of consents or approvals may be required from different permitting bodies. For example:
- A new high voltage overhead line in England and Wales, other than on land that we occupy or control, requires the consent of the Secretary of State for Trade and Industry (the Secretary of State) under Section 37 of the Electricity Act 1989. When granting Section 37 consent the Secretary of State also grants deemed planning permission for the line. We always produce a formal environmental statement for all major projects.
- New substations or major extensions to existing substations may require planning permission from local planning authorities. However, the Town & Country Planning (General Permitted Development) Order 1995, does allow certain development to take place within our existing substations and on operational land without the need to apply for planning permission.
- Installation of underground cables is permitted development and does not require either a Section 37 consent or planning permission. However, associated structure above ground such as sealing end compounds (at the point of transition between overhead lines and underground cables) may require planning permission from the local planning authority.
- Temporary construction accesses onto classified roads may also require planning permission from local planning authorities.
- Temporary or permanent culverts, outfalls and other drainage works may require planning permission and formal consents from the Environment Agency. Such approvals may relate to river crossings and other works affecting watercourses. Under local bye laws, there could also be approvals required from local drainage boards.
Please see major electricity projects for further information