By Abdullahi Lukman
The United Kingdom is set to invest more than £150 billion in expanding and modernising its electricity transmission network as rising power demand and rapid growth in renewable energy increase pressure on the existing grid.
The National Energy System Operator (NESO) estimates that about £64 billion will be required for transmission projects by 2030, with a further £89 billion needed beyond that period.
The investment will fund new pylons, high-voltage cables, subsea links and converter stations needed to connect large volumes of wind and solar power to homes and businesses across the country.
The planned overhaul is expected to involve building about five times more electricity infrastructure by the end of the decade than was constructed during the previous 30 years.
The expansion has become a key part of the UK’s effort to meet its Clean Power 2030 target, which aims to increase clean electricity generation from about 60 per cent to 100 per cent by 2030.
Keith Bell, a professor of electronic and electrical engineering at the University of Strathclyde, said insufficient transmission capacity could prevent the country from fully using its renewable energy resources and leave it more exposed to fossil-fuel price shocks and higher carbon emissions.
An analysis by The Guardian estimated that more than 4,000 miles of new power lines could be required by 2041, alongside upgrades to existing infrastructure.
The expanded network would link renewable energy projects in northern Scotland and other remote areas with major centres of demand in England.
Around £22 billion is expected to be spent over the next five years on upgrading the electricity network across the Highlands, islands and north-east Scotland. The work is expected to include more than 1,100 pylons and about 460 kilometres of high-voltage transmission lines.
A further £4 billion project will develop a subsea cable stretching about 315 miles between Peterhead in Aberdeenshire and Drax in North Yorkshire to transport renewable electricity.
The scale of the programme has generated opposition in some rural communities where new transmission lines are planned. Consumers are also expected to face higher energy costs in the short term as the infrastructure is funded, although regulators expect the investment to reduce costs over time by cutting reliance on expensive gas-fired generation.
The UK’s existing grid was largely designed around coal and gas power stations located close to major cities. The shift towards renewable energy has changed that pattern, with many new wind and solar facilities located far from population centres.
Gareth Davies, head of the National Audit Office, said the scale and speed of the planned upgrades would put significant pressure on existing systems and stressed that successful delivery would be essential to achieving value for money.
Ofgem estimates that households could eventually save about £30 a year if the grid upgrades proceed at the required pace, partly because improved transmission capacity would reduce the amount of renewable electricity that has to be curtailed.
However, some projects are expected to extend beyond 2030, potentially delaying connections for some renewable energy developments and increasing project and network constraint costs.
The government’s grid expansion programme is therefore expected to play a central role in determining how quickly the UK can connect new renewable generation and move towards a lower-carbon electricity system.
