The Hidden Drivers Behind Electricity Price Changes This April

The Hidden Drivers Behind Electricity Price Changes This April

 As businesses review their energy costs for the new financial year, April 2026 brings a dual challenge. While wholesale markets are in short-term turmoil due to current events in the Middle East, including disruptions to LNG and oil flows through the Strait of Hormuz, this may be a short-to-medium-term impact. However, underlying shifts in 2026, such as evolving network charges, environmental policies, and system costs, will have a lasting impact on what businesses ultimately pay. 

Today, the wholesale price accounts for around 38% of the total electricity bill, with the rest made up of network charges, environmental policies and system costs that keep the electricity grid running reliably.

This means changes to these regulated charges can have a significant impact on what businesses ultimately pay.

A Sharp Rise in Transmission Costs

The most significant change this year comes from Transmission Network Use of System (TNUoS) charges, the costs associated with transporting electricity across the national transmission grid.

From April 2026, transmission charges are expected to increase by around 60% compared to 2025/26 levels.

This increase marks the start of a new regulatory investment period known as RIIO-T3, which will fund large upgrades to the UK's electricity infrastructure as the system adapts to more renewable generation and increased electrification.

For many businesses, this will represent the largest shift in regulated electricity costs this year.

Local Network Costs Continue to Climb

Electricity must also travel through regional distribution networks before reaching businesses. These networks are maintained by Distribution Network Operators and funded through Distribution Use of System (DUoS) charges.

These costs have gradually increased in recent years as more investment is required to strengthen local networks.

Average DUoS costs illustrate this trend:

These increases reflect growing demand on local networks as electricity use expands across sectors such as transport, heating and data infrastructure.

The Cost of Balancing the Grid

Behind the scenes, the electricity system must constantly balance supply and demand. The cost of maintaining that balance is recovered through Balancing Services Use of System (BSUoS) charges.

These costs have also risen steadily in recent years:

For the coming year (April 2026 – March 2027), final balancing tariffs have been set at:

• £13.74/MWh in summer
• £12.49/MWh in winter
• Major transmission infrastructure investment
• Rising distribution network costs
• Higher system balancing costs
• Continued growth in renewable support schemes
• New nuclear investment charges

The rise reflects the growing complexity of managing an electricity system with increasing levels of renewable generation.

Environmental Schemes Supporting Clean Energy

Electricity bills also include a number of policy costs designed to support the transition to cleaner energy.

Some of the largest schemes include:

Contracts for Difference costs in particular are expected to grow as more renewable projects are connected to the grid, following recent auction rounds that secured 14.7GW of new low-carbon generation capacity.

A New Cost: Nuclear Investment

A newer component appearing on electricity bills is the Nuclear Regulated Asset Base (RAB) charge, which helps finance new nuclear projects such as Sizewell C.

The latest published interim levy rate for 2026 is:

£4.683/MWh

This charge supports the financing of construction costs during the development phase of the project.

Why Prices May Feel Like They’re Moving Faster

When viewed together, these changes help explain why electricity bills may feel more volatile this year. Several cost drivers are shifting at the same time:

Combined, these factors mean non-commodity costs are becoming an increasingly important part of electricity pricing.

Looking Ahead

The evolving structure of electricity pricing reflects a broader transformation of the UK energy system. Investment in infrastructure, renewable generation and system resilience will continue to shape electricity costs over the coming years.

For businesses, understanding these underlying drivers is becoming just as important as tracking wholesale energy prices when planning energy strategies and managing long-term costs.