What is kVA? The hidden capacity charge on your business energy bill

Nobody likes paying for something they don't need.

If your business energy kVA is set too high, you could be doing exactly that.

Running a business means keeping a close eye on costs, whether that’s across offices, production facilities, warehouses or retail sites.

Energy isn’t just another bill; it’s often one of the largest ongoing expenses. You may know your unit rates and standing charges.

However, hidden within those bills is something many businesses overlook: the kVA limit.

Setting the right kVA limit is crucial: get it wrong and you could be paying thousands of pounds more than you should each year.

In this article:

• Learn what kVA means for UK businesses.

• Understand how it directly impacts your business.

• Discover your options if you're paying for more than you need.

What is kVA?

kVA, or kilovolt-amperes, is a limit you’ve agreed with your electricity network operator to set a maximum amount of energy you can use at one time.

You pay a fixed cost for the kVA limit, whether you use it or not.

If you underuse your allowance you're paying for something you don't use. If you exceed your limit, you will be subjected to financial penalties.

Assigning limits to businesses means grid operators can make sure there is enough electricity to go around all domestic and business consumers at any given time.

Think of kVA like data on a phone contract. You pay for 10GB of data per month. There are two key dangers:

• If you only use 5GB of data, you are paying for capacity you don't need.

• If you frequently use 11GB per month, you are forced to pay for data outside of your allowance at much higher rates.
  

This is how kVA limits work.

For businesses with multiple sites or meters, keeping track of kVA can be complicated. One meter may be comfortably within its limit, while another is creeping close to the edge. Without visibility, it’s easy to assume everything is fine while quietly overspending.

How to check your kVA

On each electricity bill, there’s usually a section labelled Maximum Demand. This shows the highest level of demand your site has reached in the billing period.

Compare your maximum demand to your agreed kVA limit (or capacity charge) on your bill:

• If your maximum demand is consistently far below your limit: You may be paying for capacity you don’t need.

• If your demand is close to the limit: Check if one-off events are pushing it up or if your day-to-day load is too high.

Many businesses rarely have one neat electricity supply to manage due to multiple sites and bespoke seasonal demands.

This complexity makes it difficult to keep a clear view across your operations. An overall review will make the picture clearer.

Practical tips for businesses

If you’re unsure about whether your kVA is too high or too tight, here are some steps you can take:

1. Check each meter individually: Don’t rely on one site’s data to represent them all. Look at maximum demand across all supplies.
2. Review seasonal peaks: Equipment such as air conditioning, refrigeration or production lines can cause sharp spikes. Make sure your agreed limit covers these but doesn’t sit far above them for the rest of the year.
3. Search for previous penalties: If you’ve ever been charged excess capacity fees, it’s a sign your kVA may be too tight.
4. Compare your kVA against actual usage: If your maximum demand is consistently half of your limit, it may be time to reduce the agreed level.
5. Seek an independent review: A fresh set of eyes can reveal mismatches that aren’t obvious from bills alone.

How we can help

We recently reviewed the energy setup of a business whose kVA limit had been set far higher than they needed. By analysing their maximum demand across meters and realigning their limits, they were able to reduce costs by £25,476 a year.

Business energy is confusing. You know you need to stay on top of such a major cost, but that can be difficult while focusing on running your business and serving your customers.

We get it. We can support you.

Troo exists to help businesses like yours make sense of their energy needs, simplify complex information and make smart decisions that lead to real change and reduced costs.

We are not here to sell you a quick fix. We're here to understand what matters to you, offer clear advice, and take ownership of the hard parts, so energy becomes one less thing to worry about.

Book a free energy health check today for practical guidance on your business electricity, gas or water bills.