Norwegian transmission system operator Statnett is working on a programme to build power lines in a safer, faster and cheaper way to enable easier integration of renewables from remote locations into the European grid.

As part of the ‘Lean Line’ programme, Statnett has chosen quality assurance and risk management company DNV GL to provide electrical design services for the development of a new composite high-voltage transmission tower. DNV GL to help Stanett design transmission tower of the future

This will make Statnett one of the first companies in the world to develop composite towers for 420kV high-voltage overhead lines. Traditionally, composite towers have been utilized for systems between 110 and 150 kV systems.

DNV GL will help Statnett in developing a new electrical design, adhering to specific Norwegian requirements and aspects.

Oddgeir Kaspersen, Program Manager of Innovative Technology at Statnett, said the company’s over-arching main goal is to improve energy security by 20 per cent, while cutting both costs and construction time by 20 per cent.

“To do so, you need technical expertise, as the devil can be in the detail. DNV GL’s experience in innovative tower design, specifically electrical design, enables us to create a safe and reliable concept for our composite high-voltage tower.” 

Prajeev Rasiah, Executive Vice President for Northern Europe, Middle East and Africa at DNV GL–Energy, said: “To realise the full potential of the power generation from renewable sources, optimisation of grid infrastructures is vital. Having worked in electrical design for high-voltage transmission towers for more than 50 years, we are looking forward to supporting Statnett with our knowledge and expertise in this field, to enable the connection and integration of renewable energy into the grid.”

DNV GL’s grid experts will focus on the safety and reliability aspects of the transmission tower by developing insulation coordination, earthing/grounding, electrical stress testing and safety design. The new electrical design will be finalized by the end of this year, with validation tests scheduled for 2020.

The construction and operation of the pilot phase is scheduled for 2021.