Why should businesses compare more than unit rates?
Because standing charges, fixed costs, usage patterns, contract length and billing structures can all affect the total amount paid.
Business energy guide
Compare full business energy costs, not just unit rates
A low unit rate does not automatically mean the lowest overall business energy cost. Standing charges, usage profile, contract length, fixed charges and billing structure can all affect the total amount your business pays.
Part of the CNG Switch Business Energy Guides library.
Quick answer
Businesses should compare the full cost of an energy contract, not just the unit rate. A lower unit rate may still produce a higher total cost if standing charges, fixed daily charges, usage profile, contract length or billing structure are less suitable for the business.
Why unit rates are only part of the picture
The unit rate is the price charged for each kilowatt hour of electricity or gas used. It is important, but it is only one part of a business energy invoice.
Commercial energy costs can also include:
- Electricity or gas unit rates
- Standing charges
- Fixed daily costs
- Meter-related charges
- Billing period differences
- Estimated or actual meter readings
- VAT calculations
- Supplier-specific billing structures
- Contract length and renewal terms
Related guide: business energy bill explained.
Why standing charges matter
Standing charges are fixed daily costs applied regardless of actual energy usage. They can become commercially significant across multiple sites, several meters, vacant premises or low-usage properties.
A contract with a slightly lower unit rate but a much higher standing charge may not be the better overall option.
Related guide: understanding business energy standing charges.
Total annual cost is more useful than headline rate
When reviewing options, businesses should look at the likely annualised cost rather than focusing only on the lowest pence-per-kWh figure.
A fuller comparison should consider:
- Expected annual usage
- Unit rates
- Standing charges
- Contract length
- Meter arrangements
- Any fixed charges
- Operational changes that may affect usage
This helps create a more realistic view of the contract rather than a narrow comparison based only on one rate.
Lowest unit rate does not always mean lowest cost
Businesses sometimes assume a lower electricity or gas unit rate automatically creates the best commercial outcome. In reality, the wider structure may still produce a higher total cost.
This can happen because of:
- Higher standing charges
- Different billing structures
- Different contract lengths
- Different day, night or evening rates
- Usage profiles that do not match the pricing structure
- Supplier terms that are not suitable for the business
Usage profile changes the value of a contract
Two businesses on similar unit rates may still receive very different invoice totals because their usage profiles are different.
Usage can be affected by:
- Longer operating hours
- Higher occupancy
- Seasonal trading patterns
- Machinery or equipment demand
- Heating, cooling or refrigeration requirements
- Vacant, low-usage or part-used premises
This is why contract suitability should be considered alongside real operating patterns.
Day, night and multi-rate meters
Some businesses have more than one unit rate. This may include day rates, night rates, evening rates, weekend rates or half-hourly arrangements.
In these cases, looking only at one headline unit rate can be misleading. The business needs to understand when energy is being used and which rate applies to that usage.
Different sectors experience energy costs differently
Operational demand varies significantly between sectors. A pricing structure that suits one business may not suit another.
- Hospitality businesses may experience refrigeration, kitchens, hot water, heating and seasonal occupancy demand.
- Manufacturing businesses often operate machinery-heavy environments with variable production demand.
- Care homes require stable continuous operational supply and consistent heating or hot water demand.
- Warehouses may depend heavily on lighting, heating, charging, refrigeration or large open spaces.
- Retail businesses may operate several stores with different demand profiles.
- Office-based businesses may experience occupancy-driven operational changes.
Why multi-site businesses need stronger visibility
Businesses operating several locations often manage different suppliers, standing charges, billing formats, contract dates, meter arrangements and operational demand profiles.
Without central oversight, it can be difficult to compare total energy costs accurately across sites.
Multi-site businesses should review:
- Site-level usage
- Meter-level standing charges
- Different unit rates by supply
- Contract end dates
- MPAN and MPRN records
- Whether any site is on rollover or out-of-contract terms
Related guide: how multi-site businesses manage energy contracts.
Why existing invoices matter before renewal
Existing invoices often reveal practical information that should be reviewed before any renewal decision.
- Current unit rates
- Standing charge exposure
- Actual or estimated meter readings
- Operational usage trends
- Supplier arrangements
- Potential rollover exposure
- Out-of-contract risk
Related guide: why businesses should review energy bills before renewing.
How businesses improve cost visibility
Businesses can improve cost visibility by keeping key billing and contract records together and reviewing them before deadlines become urgent.
- Historic invoice records
- Current contracts
- Renewal tracking systems
- Supplier communication logs
- Operational usage comparisons
- Site-level billing visibility
- MPAN and MPRN records
Why early reviews improve decision-making
Businesses often only compare pricing once supplier deadlines become urgent. Earlier reviews improve visibility over standing charges, usage trends, supplier arrangements, billing structures and renewal timelines.
Earlier visibility can reduce rushed decisions and make it easier to compare the full commercial position rather than focusing only on headline pricing.
Related guide: when should you renew a business energy contract?
FAQs
Does the lowest unit rate always mean the lowest cost?
No. A lower unit rate may still cost more overall if fixed charges, standing charges or contract terms are less suitable.
Why do standing charges matter?
Standing charges are fixed daily costs and can significantly affect annual cost across multiple sites or meters.
Can CNG Switch review full energy costs?
Yes. CNG Switch can review bills, standing charges, unit rates, usage profile and renewal timing.
Need better visibility over your full energy costs?
If you want clearer visibility over your current commercial energy setup before renewal deadlines approach, CNG Switch can help review your bill, rates, standing charges, usage profile and contract position.
No guaranteed savings. Available options depend on supplier criteria, usage profile, contract timing and business circumstances.
Read next