As temperatures begin to fall and attention turns towards winter energy bills, discussion inevitably focuses on forecast gas and electricity prices and what they mean for household and business costs. With the Autumn Budget approaching on 28 October, there is also growing speculation around what support the Government may provide to help reduce energy costs for homes and businesses.
However, while wholesale market prices often receive the most attention, they are only one component of an energy bill. Behind every gas and electricity bill sits a complex web of network charges, policy costs, taxes, market mechanisms and regulatory levies that can significantly influence what consumers ultimately pay.
For organisations involved in energy procurement, understanding these costs can be just as important as tracking wholesale market movements. In many cases, non-commodity costs can have a material impact on overall energy expenditure and, increasingly, influence procurement decisions, contract structures and long-term energy strategies.
Collectively known as non-commodity costs, these charges are among the most complex and rapidly evolving aspects of the GB energy market.
Energy bills involve much more than buying energy
Whether the customer is a domestic household, a small business or a major industrial site, the underlying components of an energy bill are broadly similar:
- Wholesale energy costs
- Network costs
- Policy and environmental scheme costs
- Taxes and levies
- Supplier operating costs and margins
While wholesale energy costs remain an important driver of bills, non-commodity costs account for a substantial proportion of overall energy costs and have become increasingly significant over the last decade.
This is particularly important for organisations managing business energy procurement, where understanding future network and policy costs can be just as valuable as assessing gas and electricity price forecasts. In some cases, changes to non-commodity costs can have a greater impact on overall energy bills than short-term movements in wholesale markets.
Why non-commodity costs are so complex
Unlike wholesale costs, which broadly reflect market prices for gas and electricity, non-commodity charges are derived from dozens of different schemes and charging methodologies.
There are more than two dozen separate non-commodity cost components applied across gas and electricity bills in Great Britain. These costs are not applied uniformly and often vary depending on factors including:
- Customer location
- Whether the customer consumes gas and/or electricity
- Connection voltage or pressure level
- Time of energy consumption
- Annual consumption volume
- Eligibility for exemptions or relief schemes
As a result, two customers with similar energy consumption can face materially different non-commodity costs.
Some charges are recovered through unit rates, others through standing charges. Some vary by season, day of the week or time of day. Others change annually in response to regulatory decisions, investment requirements or policy reforms.
For suppliers and consumers alike, understanding exactly which charges apply, how they are calculated and how they evolve can be a significant challenge.
Many organisations focus heavily on wholesale market pricing during energy procurement exercises, but non-commodity costs may be even harder to forecast. While commodity costs are driven largely by market fundamentals, non-commodity costs are affected by regulatory reform, government policy, infrastructure investment and changing charging methodologies.
Why these costs are becoming increasingly important
The importance of non-commodity costs continues to grow as the energy system evolves.
Network costs are increasing as substantial investment is being made to expand and modernise Britain’s electricity network infrastructure. New transmission and distribution assets are required to support growing electricity demand, connect renewable generation, facilitate electric vehicle uptake and accommodate major new sources of demand such as data centres.
A significant component of non-commodity costs is Transmission Network Use of System (TNUoS) charges, which help fund the operation, maintenance and expansion of Great Britain’s high-voltage electricity transmission network. Alongside distribution network charges, these costs are becoming an increasingly significant part of electricity bills. Over the coming years, combined electricity network charges could exceed wholesale electricity costs for some business sites, highlighting the growing importance of understanding and managing non-commodity costs.
Policy costs also remain significant. The Renewables Obligation (RO), introduced in 2002 to support renewable generation, remains a major component of electricity bills despite closing to new projects nearly a decade ago. While the scheme successfully helped establish a large renewable generation sector, legacy support payments continue and will remain on bills for years to come.
At the same time, new funding mechanisms continue to emerge. The Nuclear Regulated Asset Base (RAB) model, introduced to support the development of Sizewell C, was added to electricity bills last year. This means consumers are simultaneously funding both legacy and future infrastructure through a growing range of policy mechanisms.
For businesses seeking to understand future energy costs, looking solely at gas and electricity price forecasts no longer provides a complete picture of likely energy expenditure.
Government interventions add further complexity
Successive governments have sought to reduce the impact of energy costs on consumers through a variety of targeted interventions.
Examples include:
- Temporary VAT relief on domestic electricity bills until end of March 2027
- Exchequer funding of 75% of household Renewables Obligation costs until end of March 2029
- The British Industry Supercharger scheme for eligible energy-intensive industries
- The British Industrial Competitiveness Scheme for eligible manufacturing businesses
While such measures can provide welcome relief, they also increase the complexity of understanding energy bills. Suppliers and consumers must navigate a growing set of exemptions, rebates and cost recovery arrangements that affect different customer groups in different ways.
For organisations responsible for business energy procurement, understanding whether and how such schemes apply can materially affect costs, budgeting and procurement strategies.
The rise of time-of-use charging
The growing adoption of time-of-use tariffs and contracts highlights another layer of complexity.
Many electricity network charges vary depending on when power is consumed. Customers with flexibility, onsite generation, battery storage or sophisticated energy management systems may be able to reduce costs by shifting demand away from peak charging periods.
This is particularly relevant for businesses seeking to reduce exposure to network charges and understand how these charges are recovered, which can influence operational decisions, investment cases and procurement strategies.
However, understanding the underlying drivers of these tariffs requires an appreciation of how network and policy costs are recovered across the energy system. As these signals become increasingly important, a better understanding of non-commodity costs is becoming a commercial necessity rather than a specialist area of knowledge.
Why understanding non-commodity costs matters
The way non-commodity costs are recovered remains an active policy debate.
Industry stakeholders continue to assess whether current charging arrangements:
- Fairly allocate costs between consumers
- Provide efficient signals for investment and consumption
- Support electrification objectives
- Enable decarbonisation at lowest cost
- Maintain affordability for households and businesses
With regulatory reforms, network investment programmes and government interventions all shaping future bills, understanding non-commodity costs has never been more important.
Developing the knowledge to navigate an increasingly complex market
For suppliers, energy managers, procurement professionals, brokers and large energy users, keeping pace with non-commodity charging arrangements can be challenging.
Whether you are assessing gas and electricity prices forecasts, managing energy procurement activities, overseeing business energy procurement, or seeking to understand charges, a comprehensive understanding of non-commodity costs has become increasingly important.
Cornwall Insight’s Understanding Non-Commodity Costs on Energy Bills training course provides a practical guide to how these charges work in Great Britain’s gas and electricity markets. The course explains:
- The principles behind non-commodity cost recovery
- Key network, policy and market charges
- How different costs are allocated to different customer groups
- How charges are reflected in end-user bills
- Current reforms and future charging developments
- The outlook for non-commodity costs over the coming years
As energy markets become increasingly complex, developing a clear understanding of non-commodity costs is essential for anyone involved in managing, analysing or purchasing energy.
Our next online course is scheduled for 3–4 November, running from 10:00am to 12:00pm on each day.
Find out more about Cornwall Insight’s Understanding Non-Commodity Costs on Energy Bills course and gain a deeper understanding of the charges shaping energy bills across Great Britain.
