Publications and resources

This report describes Transpower's financial and operational performance for the financial year ending 30 June 2012.

Over time, transmission poles may require replacement due to normal age-related wear and tear or to ensure safe ground clearances are maintained.

Helicopters are a vital part of inspecting and maintaining our 11,800 km of transmission lines  throughout the country.

We routinely check and assess the condition of that equipment to ensure the National Grid continues to provide a safe and secure power supply for the country.

Tower painting is part of our routine maintenance activities to ensure they continue to provide a reliable service over their expected lifetimes.

Tower foundation refurbishment involves reinforcing transmission tower foundations, to ensure they continue to accommodate the existing and future loadings expected in their lifetimes.

Transmission line hardware is a general term describing the fittings on a structure (tower or pole) including those items attached to the conductor (wire). ...

Insulators insulate the line so that the electricity being transported stays on the line and does not become earthed through the supporting structure.

Injurious affect occurs when an upgrade to the transmission line results in a permanent and non-negligible loss of value to your land.

Access tracks are our means to access many of our towers and poles located on private land. They might also include bridges or culverts built to enable our access.