In the rare event of a lightning strike or fault on the transmission line, towers or poles may transfer high voltage and dangerous currents into the ground for a very short instant. This is known as ‘Earth Potential Rise’ (EPR). This information sheet provides information on minimising the risk from EPR.
A best practice guide on the management of trees around transmission lines.
From time to time we use helicopters to inspect or undertake maintenance work on our high voltage network at low levels. While we notify landowners beneath our lines and advertise the work in local newspapers we are aware that neighbouring properties (near but not under the lines), may wish to receive notice of helicopter work too. This may be particularly important for sensitive land uses like breeding or raising horses.
This information sheet provides important information on Mycoplasma bovis and best practice measures in its containment.
We use service providers (contractors) to carry out maintenance work on our network. The maps below show the name and contact details of the service provider working in your area. Alternatively, please call us on 0508 LANDOWNER (0508 526 369).
This information sheet details Transpower's measures around biosecurity.
This factsheet provides information on the issues surrounding the growing and harvesting of forestry near transmission lines.
The Electricity Code of Practice provides minimum approach distances in and around transmission structures and conductors. These diagrams provide quick guidance and reference on minimum approach distances for 220 kV and 110 kV structures.
This guide provides information on the types of issues that development near National Grid lines can have on the lines and, conversely, the issues National Grid lines can have on development. It works through the different types of development and suggests ways of addressing the issues identified and provides some ideas on how land can be used and developed in ways that are safe and compatible with the existing National Grid lines.
This information sheet details keeping safe during recreational activities near transmission lines.