Managing business electricity costs requires understanding how your organisation’s site uses power and how your energy supplier charges you for it. One factor that often gets overlooked is kVA, which is the capacity your business is allowed to draw from the grid. If this capacity is set incorrectly, you can end up paying for more than you need or being charged penalties for exceeding it.
A kVA review helps you check whether your agreed supply capacity matches your actual demand, so you can avoid unnecessary charges, keep your energy contract aligned with your usage, and ensure you have accurate data before renewing or switching supplier
A review is especially important if your business uses a half-hourly meter, has recently changed equipment or processes, or has moved into a new premises where the existing capacity may not match your needs. Understanding your kVA position gives you a more accurate picture of your energy consumption, supports better contract decisions, and helps you control your long term electricity costs.
Find out if you can reduce standing charges with a quick kVA check.For Busy Readers
- kVA shows the electrical capacity your site is allowed to draw from the grid.
- If your kVA is set too high, you pay for unused capacity. If it is set too low, you risk excess capacity charges at a premium rate.
- A kVA review compares your agreed capacity against your peak demand from half hourly data.
- You may need a review if you have installed new equipment, changed operations, or moved premises.
- Reviewing capacity helps lower standing charges, prevent penalties, and improve energy efficiency.
- You can reduce or increase capacity through your Distribution Network Operator, but it must be based on accurate demand data.
- A kVA review can show whether you are overspending or at risk of costly overuse.
If you are unsure how your kVA affects your business electricity bills or contract, request a review before renewing or switching suppliers.
The Difference Between kW and kVA
Understanding the difference between kW (kilowatts) and kVA (kilo-volt-amperes) is essential for managing your electrical system efficiently. While both are units of measurement for electrical power, they serve different purposes. kW measures the actual power that is converted into useful work output, such as running machinery or lighting a building. On the other hand, kVA measures the apparent power, which includes both the actual power and the power lost due to inefficiencies in the system.
The key factor that differentiates kW from kVA is the power factor. The power factor is a measure of how effectively your electrical system converts electrical current into useful power. A higher power factor indicates a more efficient system. For instance, a power factor of 1 means that all the power is being effectively used, while a lower power factor indicates more losses.
Your electricity supplier or Distribution Network Operator assigns your business an agreed kVA capacity. This is essentially your reserved supply. You pay for this every month as part of your energy contract, regardless of how much energy you use.
If your agreed capacity is too high, you pay for unnecessary headroom. If it is too low, you risk excess capacity charges that can significantly increase the cost of your business electricity.
A kVA review helps you align your agreed capacity with your real operational needs. This ensures that you only pay for what your business genuinely requires.
Why kVA Reviews Are Becoming More Important
With energy prices increasing across the UK energy market and businesses working harder to manage costs and carbon footprint, being aware of your kVA level is essential. A review helps you understand:
- How much energy your site is capable of pulling from the grid.
- Whether your business electricity bills reflect your actual usage.
- If you are being charged excess capacity fees without realising.
- Whether your business energy contract is still suitable following operational changes.
Common Reasons You Might Need a kVA Review
Many businesses only think about kVA when they notice higher bills. However, you may benefit from a review if:
- You have installed new equipment that increases demand.
- Your operations have become more automated or energy efficient.
- You have moved into new premises where the existing capacity was set for a previous occupant.
- Your business energy supplier has notified you of exceeding capacity.
- You want to compare business electricity prices and secure a better business energy deal.
- You are planning to switch business energy providers and want accurate data before committing.
If any of these situations sound familiar, it is worth checking your kVA level.
What Happens If Your kVA Is Incorrect?
If Your kVA Is Too Low
When your usage exceeds your agreed capacity, your supplier may apply excess capacity charges. These are typically two to three times higher than the standard capacity rate.
You may also put unnecessary strain on your electrical infrastructure, which could shorten the lifespan of your equipment.
If Your kVA Is Too High
If your capacity is set above what you need, you are paying for unused supply. Reducing it to the right level can lower your fixed charges and create meaningful savings on your electricity costs.
Signs Your Business Needs a KVA Review
| Issue | What You Might Notice | Impact on Energy Bills |
|---|---|---|
| Exceeding agreed capacity | Warnings from supplier or unexplained increases | Excess capacity charges |
| Newly installed equipment | Demand spikes shown in half hourly data | Higher maximum demand |
| Using less equipment than before | Large gap between capacity and actual use | Paying for unused kVA |
| Moving premises | Previous occupant had different needs | Overcapacity or undercapacity |
| Planning to compare deals | You want accurate data before switching | Better business energy comparison outcomes |
How a kVA Review Works
A kVA review looks at your half hourly meter data, identifies your highest demand periods, and compares them with your agreed supply capacity. In most cases, businesses discover they can safely reduce capacity, lowering costs and making their business electricity tariffs more efficient.
If you are unsure how to access this data, or you need support interpreting it, speaking with a specialist is the easiest route.
If you want to lower your business electricity prices or simply understand whether you are paying too much, a kVA review is an important first step. If you are unsure where to begin, our experts can assess your usage and advise on capacity levels that support your operations while protecting your budget.
Get in touch today for your kVA review and take control of your business energy costs.
Get Your Free kVA Review Today
Claim Your Free kVA Review Today Optimising your kVA can lead to substantial cost savings. Contact us now for a free kVA review and ensure your business is on the right energy plan.
It is the maximum kVA your site can draw from the grid at any time. You pay for this as part of your standing charges.
Check the capacity section of your latest energy bill. If it is unclear, ask your energy supplier directly.
If you have a Half-Hourly meter or your usage has changed recently, it is strongly recommended.
Yes. Reducing overcapacity can lower standing charges, and correcting low capacity helps prevent excess charges.
Usually no. A specialist can manage the application process on your behalf.
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