NESO TNUoS kVA Banding Charges: How Businesses Can Cut Electricity Standing Charges
If your latest electricity bill has landed with a higher-than-expected standing charge, you are not alone. The National Energy System Operator (NESO) has introduced changes to Transmission Network Use of System (TNUoS) charging, meaning businesses with oversized agreed capacity may now be paying more than necessary. If your Maximum Import Capacity sits just above a new kilo-volt-amperes (kVA) threshold, a capacity and banding review could help reduce your daily standing charge without reducing energy use.
For commercial sites, particularly half-hourly metered supplies, this can mean paying significantly more before a single unit of energy is used. However, these changes also create an important opportunity. By reviewing your agreed capacity against your actual demand, we can help identify whether your site is sitting in the wrong kVA band and whether savings may be available.
Understanding NESO’s New TNUoS kVA Bandings
Alongside the price increases, NESO has restructured how Maximum Import Capacity (kVA) is banded for half-hourly metered sites.
Your agreed capacity determines which pricing band your site falls into, and that band directly impacts your daily standing charge.
In simple terms, your agreed capacity now matters more than ever. Low Voltage sites are being assessed against new thresholds around 90 kVA, 150 kVA and 250 kVA, while High Voltage sites are seeing revised bands from 500 kVA upwards.
This means that if your agreed capacity sits just above a threshold, you may be paying more than you need to every day.
The Cost of Oversized Maximum Import Capacity
Many businesses are unknowingly paying for grid capacity they simply do not use. This often happens because agreed capacity was set years ago, based on older demand assumptions, planned site expansions or equipment that may no longer reflect how the business operates today.
For example, a site may have an agreed capacity of 550 kVA, but only ever reach a peak demand of around 450 kVA. Under the revised banding structure, that business could still be charged in a higher bracket because the agreed capacity, not the actual peak demand, is what determines the band.
Why Automatic DNO Capacity Adjustments Don’t Always Work
Some businesses assume their Distribution Network Operator (DNO) will automatically correct this, but that is not always the case. Agreed capacity is not routinely reviewed against current consumption, so outdated records and legacy agreements can remain in place for years.
As a result, a business can stay in the wrong kVA band unless the issue is actively identified, evidenced and challenged.
What TNUoS kVA Banding Changes Mean in Real Terms
The financial impact can be significant. If a site is placed in a higher kVA band than it needs, the additional standing charge is applied every day. For some businesses, moving down just one High Voltage band could reduce costs by £50 to £250 per day, with potential annual savings reaching tens of thousands of pounds per site.
How TCR Has Changed Standing Charges
These changes build on Ofgem’s Targeted Charging Review (TCR), which restructured how network costs are recovered. TCR moved more costs into fixed standing charges rather than unit rates, meaning businesses now pay a larger proportion of their bill based on agreed capacity and connection characteristics, rather than energy consumption.
How Stadia Utilities Helps Reduce Business Electricity Standing Charges
Most businesses do not have the time, data access or technical resource to manage kVA banding reviews, DNO processes and tariff impacts internally. This is where our team can support you.
We combine data analysis, supplier knowledge and direct industry engagement to help ensure your business is only paying for the capacity it actually needs.
We start by reviewing your 12-month peak demand profile to understand how much capacity your site actually uses. From there, we compare your agreed capacity against the updated NESO TNUoS banding structure to see whether your business may be sitting in a higher band than necessary.
Where a reduction is suitable, we support the process by reviewing the data, preparing the evidence and engaging with the relevant parties on your behalf. This helps ensure your agreed capacity is aligned with how your site actually operates, rather than leaving you exposed to unnecessary fixed charges.
FAQs:
What are TNUoS charges?
Charges for using the UK transmission network, typically included in your standing charge.
What is kVA banding?
Your agreed capacity (kVA) places you in a pricing band that sets your daily standing charge.
What is Maximum Import Capacity (MIC)?
The maximum power your site can draw from the grid, which determines your band and costs.
Why might we be overpaying?
If your capacity is set above actual usage or just over a threshold, you may be in a higher-cost band.
Will the DNO fix this automatically?
No – capacity is rarely reviewed unless you request it.
Could reducing capacity impact operations?
Not when based on real demand data – it should match how your site actually runs.
How much could we save?
Dropping a band can save £50-£250 per day, depending on a site size.
As TNUoS costs continue to place pressure on commercial energy bills, now is the time to check whether your current capacity still reflects your needs. If it does not, you may be paying for grid capacity your business no longer uses.
Book a Complimentary Capacity and Banding Audit
Before you accept higher standing charges as unavoidable, it is worth checking whether your agreed capacity still reflects how your site actually operates.
Our complimentary capacity and banding audit gives you a clear view of whether savings may be available, with no obligation to proceed.
