Business electricity rates explained: what you're really paying for
The four components of a UK business electricity rate
Every business electricity rate you're quoted is built from the same four ingredients: wholesale energy, network use, environmental & policy costs, and supplier margin. Understanding the mix helps you judge whether a quoted rate is fair for your business size and usage pattern.
1. Wholesale electricity — the biggest variable
Wholesale power typically accounts for 40-50% of your unit rate. Suppliers buy in bulk on the day-ahead and forward markets and pass movements on to your tariff. This is why locking a fixed rate when wholesale prices are low can produce savings that compound for years — and why waiting through a price spike to 'see what happens' is rarely a good bet.
2. Network charges — regional and unavoidable
The cost of moving electricity from generators to your meter — through the transmission grid and your regional distribution network — is passed straight through by suppliers. These charges vary by region: a Glasgow meter and a Southampton meter on identical usage will have different network cost lines. There's no way to negotiate them, but knowing they exist explains why quotes differ by region even from the same supplier.
3. Environmental & policy costs
The Contracts for Difference scheme, Renewables Obligation, Feed-in Tariff, Capacity Market and Climate Change Levy together add up to a meaningful slice of your bill. These are set by government policy and passed through by suppliers. Some renewable tariffs partially offset the CCL if you qualify.
4. Supplier operating cost and margin
This is the only part suppliers directly control — the cost of billing, hedging, credit management and their own profit. It's typically 5-10% of the total rate. Suppliers with lower operating costs (or hungrier growth targets) can price sharper here, which is why panel comparisons matter.
How your business size affects your rate
Larger users get lower unit rates because they represent higher-margin business for the supplier. The steepest step-up is usually between the small-business band (< 25,000 kWh/year) and the medium band. If your usage is close to the top of a band, it's worth checking whether small operational changes could push you into the next tier's pricing.
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