Standing charge and unit rate explained for UK businesses

Every UK business electricity and gas bill is built from two main numbers: the standing charge and the unit rate. Together they determine what you pay each month or quarter, yet many owners and finance teams focus on only one of them when comparing quotes. Understanding both is essential if you want a fair energy bill explained in plain terms and a realistic way to choose energy tariff options for your premises.

This guide breaks down what each charge means, how meter types affect the unit rate you see, why commercial contracts differ from domestic deals, and how to compare tariffs without being misled by headline rates alone.

What is a unit rate?

The unit rate is the price you pay for each unit of energy you actually use. For electricity it is quoted in pence per kilowatt hour (p/kWh). For gas it is usually p/kWh as well, though some older bills still show therms.

Your meter type affects how many unit rates appear on your bill:

Single-rate meters

Most small business sites have a single-rate electricity meter. You pay one unit rate regardless of when you use power. This is the simplest structure and the easiest to compare across suppliers.

Day and night (multi-rate) meters

Some premises have day/night or Economy 7-style meters. You pay a higher rate during the day and a lower rate overnight. That can suit businesses with night-time processes, storage heating or EV charging, but only if enough consumption shifts into the cheaper period.

Half-hourly (HH) meters

Larger sites often have half-hourly meters. Usage is recorded in 30-minute blocks, and tariffs may include time-of-use bands or pass-through elements. HH contracts are more complex; compare the full contract summary, not a single average p/kWh.

Commercial vs domestic unit rates

Business energy charges are negotiated in the open market. Unit rates for commercial contracts are not set by the domestic price cap and vary by consumption, credit status and contract length. Domestic bills use simpler tariff labels; business quotes should show standing charge and unit rate separately [Source 2].

What is a standing charge?

The standing charge is a fixed daily fee for keeping your premises connected to the network and covering supplier costs such as metering, billing and industry levies. You pay it whether you use any energy that day or not.

On a typical bill you will see:

• a daily standing charge (for example 45p per day), multiplied by the number of days in the billing period, or
• a monthly standing charge shown as a single line item.

Standing charges exist on both gas and electricity. What they cover can include network access, meter maintenance and policy costs passed through to customers [Source 4][Source 5]. The standing charge does not replace the unit rate; you pay both.

Some marketing tariffs advertise a very low or zero standing charge. That often means a higher unit rate, so the total bill may still be expensive for sites that use energy regularly. Treat unit rate vs standing charge as a pair, not a competition.

Regulation: Ofgem and the price cap

A common misunderstanding is that Ofgem caps all energy prices. In fact, the Ofgem price cap applies to domestic default tariffs in England, Wales and Scotland (and core domestic rules in Northern Ireland are handled separately). It limits the level of standing charges and unit rates suppliers can charge on those protected domestic deals [Source 1].

Business energy contracts are not covered by the domestic price cap. Commercial gas and electricity are bought on the wholesale market and sold through bespoke or published business tariffs. Ofgem regulates the market and licenses suppliers, but your price is set by contract, not by the household cap.

For the latest cap levels and how they are calculated, refer to Ofgem directly [Source 1]. If you also supply a linked domestic property, keep business and domestic contracts separate in your records.

Worked example: lower unit rate vs lower standing charge

Imagine a small office using 25,000 kWh of electricity per year (roughly 68 kWh per day). You receive two one-year fixed quotes:

| Tariff | Standing charge | Unit rate |

|--------|-----------------|-----------|

| Tariff A | 55p/day | 24.5p/kWh |

| Tariff B | 30p/day | 26.0p/kWh |

Tariff A looks more expensive on the standing charge but cheaper on usage.

Annual standing charge:

• Tariff A: 0.55 × 365 = £200.75
• Tariff B: 0.30 × 365 = £109.50

Annual unit cost:

• Tariff A: 25,000 × 0.245 = £6,125.00
• Tariff B: 25,000 × 0.260 = £6,500.00

Estimated annual total (excluding VAT and other levies):

• Tariff A: £6,325.75
• Tariff B: £6,609.50

At this consumption level, Tariff A saves about £284 a year despite the higher standing charge. The break-even point between these two quotes is around 17,400 kWh per year. Below that, Tariff B's lower standing charge wins; above it, Tariff A's lower unit rate wins.

That is why a headline "cheap rate" can mislead: the right tariff depends on your actual annual consumption and operating pattern. Use our [free business energy calculator](https://businessenergycalculator.co.uk/) to plug in your own standing charge, unit rate and kWh figures instead of guessing.

Practical checklist for bills and comparing quotes

When you review a bill or a renewal quote, work through this list:

1. Find both numbers — standing charge (per day) and unit rate (p/kWh) for electricity and gas separately.

2. Check the billing period — multiply daily standing charge by days on the bill; confirm it matches the line item.

3. Note meter type — single-rate, day/night or half-hourly; multi-rate meters need all bands compared.

4. Use annual kWh — from the last 12 months of bills or meter reads, not a single winter quarter.

5. Include contract length and exit fees — a cheap unit rate on a long fixed deal may cost more to leave early.

6. Ask about pass-through costs — larger HH contracts may add capacity charges, DUoS/TUoS or other non-commodity lines [Source 3].

7. Confirm VAT treatment — most business energy is charged at 20% VAT, but exemptions and reduced rates exist for some charities and domestic-linked supplies. Check your invoices or speak to your accountant rather than assuming.

8. Compare total annual cost — not just p/kWh in isolation.

If terms are unclear, our [FAQ page](https://businessenergycalculator.co.uk/faq) covers common questions about estimates, VAT and how calculators use your inputs.

How to reduce costs and choose between tariffs

Once you understand standing charge and unit rate, you can make sharper decisions:

• High consumption sites usually benefit more from a lower unit rate, even with a higher standing charge.
• Low consumption sites may do better with a lower standing charge if annual kWh is modest.
• Efficiency first — the cheapest kWh is the one you do not use.
• Time your renewal — compare the market before your contract end date.
• Test scenarios — run low- and high-usage figures through the same quotes.

There is no universal "best" tariff. The right choice is the lowest total cost for your meter type, consumption and risk appetite (fixed vs flexible), with clear contract terms.

Conclusion

Your business energy bill is driven by two levers: a fixed standing charge for staying connected and a variable unit rate for every kWh you consume. Domestic Ofgem caps do not set commercial prices, so UK businesses must compare both numbers on every quote. Work out your annual usage, run the maths on total cost, and use tools rather than headlines to decide.

Model your own figures with our [UK business energy calculator](https://businessenergycalculator.co.uk/) before you sign your next contract.

FAQs

Q: What is the difference between a standing charge and a unit rate?

A: The standing charge is a fixed daily fee for connection and related costs, paid every day regardless of usage. The unit rate is the price per kWh for the energy you actually consume. Your bill is the sum of standing charges for the period plus (usage × unit rate), plus VAT and any other applicable charges [Source 2][Source 5].

Q: Does the Ofgem energy price cap apply to my business?

A: No. The Ofgem price cap applies to domestic default tariffs, not standard business energy contracts. Commercial prices are set by the market and your supply agreement. Check Ofgem for current cap rules and levels on household supplies only [Source 1].

Q: Should I choose a lower unit rate or a lower standing charge?

A: It depends on annual consumption. Higher-use sites generally save more from a lower unit rate; low-use sites may benefit from a lower standing charge. Calculate total annual cost for each quote using your real kWh figures rather than choosing on one number alone [Source 4].

Q: Can businesses get tariffs with no standing charge?

A: Some suppliers offer tariffs with a zero or very low standing charge, often with a higher unit rate. They can suit very low consumption but are rarely the cheapest option for typical trading premises. Always compare the full annual bill [Source 4][Source 5].

Sources

1. [How does the energy price cap work? — Ofgem](https://www.ofgem.gov.uk/information-consumers/energy-advice-households/how-does-energy-price-cap-work)

2. [Your energy bill explained — Citizens Advice](https://www.citizensadvice.org.uk/consumer/energy/energy-supply/get-a-better-energy-deal/your-energy-bill-explained/)

3. [Energy prices and bills — House of Commons Library](https://commonslibrary.parliament.uk/research-briefings/cbp-9713/)

4. [What is a standing charge? — MoneySavingExpert](https://www.moneysavingexpert.com/utilities/what-is-a-standing-charge/)

5. [Understanding your bill — ScottishPower](https://www.scottishpower.co.uk/help-support/meters-readings/understanding-your-bill)