The power company expects to award two framework agreements that will carry a maximum of four firms on each.

Its Electricity Transmission Overhead Line Alliance Framework Agreement is being thrown open to firms in consortia or bidding as prime contractor with nominated supply chains.

But delivery of a high level asset management strategy, forecasting, design audit and governance will most likely be carried out by a National Grid team who will work as integrated partners with the successful firms.

Currently there are over 4,375 miles of overhead electricity line supported by 22,000 pylons, some up to 170 feet high.

National Grid has set out a £22b investment programme over coming years to meet the anticipated surge in demand for new overhead and underground power lines as new generators are attached to the network.

Firms have until 27 April to prequalify with further details available by calling Sarah Crowe on 01926 656606 or emailing: [email protected]