Households in the United Kingdom could face an increase of approximately £100 per year on their energy bills by the end of the decade due to delays in upgrading the country's power network, according to a recent report by the National Audit Office (NAO). The report highlights that outdated infrastructure is forcing operators to curtail wind power generation and rely instead on gas-fired plants to maintain electricity supply, a shift that carries significant extra costs.

The NAO's analysis points to delays in a £70 billion infrastructure program aimed at delivering new power lines critical to meeting the government’s 2030 clean energy targets. Of the 56 projects identified as essential for achieving this goal, 50 are expected to be late, with delays ranging from one to nearly seven years. Seven power lines are considered particularly vital; failure to complete these by 2030 could result in an additional £6.7 billion in wasted wind power payments.

The Network Energy System Operator (Neso), the government-owned body responsible for balancing electricity supply, currently pays wind farms located in remote areas to reduce or stop generating power when the network cannot transmit electricity safely to urban demand centers. This curtailment leads to costs known as "wasted wind" payments. Meanwhile, Neso must compensate gas-fired power plants closer to cities to ramp up electricity generation to fill the gap.

Currently, households collectively pay around £1.9 billion annually to cover these wasted wind payments, but the NAO projects this figure could increase fourfold within four years, effectively adding roughly £75 to each household’s bill. When combined with other rising network costs, the total extra expense is estimated at £100 per household yearly.

This outlook contrasts with the government’s pledge under Prime Minister Keir Starmer’s administration to reduce household energy bills by £300 annually by 2030. Energy market data indicates that the costs associated with balancing wind and gas generation are already escalating. For example, on one recent day, Neso recorded a peak expenditure of £29 million on managing wasted wind power, with payments split between compensating curtailed wind turbines and increased gas plant output.

The NAO report also notes that while ongoing upgrades to power lines are intended to ease transmission bottlenecks and improve system capacity, these works will temporarily exacerbate the problem, contributing an additional estimated £60 to annual household bills.

These findings underscore the challenges Britain faces in modernizing its power infrastructure to accommodate growing renewable energy capacity while keeping consumer costs under control.