How to benchmark your business energy costs
A method for testing whether your business energy costs are competitive, and why comparing unit rates alone will mislead you.
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Benchmarking answers one question: is what you pay for energy explained by the market, or by your position in it? Most businesses cannot answer this, not because they lack ability, but because the reference points needed to answer it are not on the bill. The market is designed so that buyers cannot easily tell a fair price from a poor one, and overpayment persists precisely because it is invisible.
A real benchmark is not a comparison of quotes. It is a decomposition. Every business energy bill bundles a commodity cost, network charges, policy levies, supplier margin and, frequently, an embedded broker commission. Only the commodity element can be meaningfully compared with the wholesale market, and only once you know when and how your contract was priced.
Step one: separate the components
Start by breaking the delivered price into its parts: wholesale energy, distribution and transmission charges, balancing costs, levies, metering, supplier margin and any third-party commission. Some contracts state these separately; many blend them into a single rate. Until the components are separated, any comparison is arithmetic on the wrong numbers.
On the bill itself, the line items rarely map cleanly onto these components. A single “unit rate” commonly bundles the wholesale commodity cost with network charges, policy levies and supplier margin into one number, which is precisely what makes it unreadable. A standing charge may recover genuinely fixed costs, or it may be where a supplier parks charges it would rather not itemise. A “green” or environmental line can duplicate a levy that is already embedded in the unit rate elsewhere on the same bill, charging for the same policy cost twice under different names. Where a broker has arranged the contract, its commission is almost always folded into the unit rate rather than shown separately, which means the one component a buyer most wants to see, how much of the rate is energy and how much is intermediation, is usually the one component no bill will show voluntarily. Separating the components means treating the bill layout as a starting point, not an answer.
Step two: compare the commodity against the market
The commodity element should track the wholesale market for the period when the contract was agreed. Published day-ahead and forward market data give you the reference curve. The question is not whether your rate is higher than today’s market, which proves nothing, but whether the margin between your rate and the market at the point of pricing was reasonable and disclosed.
Vester benchmarks the commodity element against day-ahead and forward wholesale market data for Great Britain, the same reference prices suppliers themselves buy against, rather than against other suppliers’ quotes. The comparison has to be built around a window, not a single date. A fixed-price contract signed in one month reflects the forward curve as it stood around that signing period, not the market on the day the bill arrives or the benchmark is run. Comparing today’s wholesale price against a contract priced eighteen months ago produces a number that looks dramatic and means very little. The correct comparison lines up the contract’s pricing window against the forward price for the same delivery period at that time, then adds back the known non-commodity components to reconstruct what a fair, fully-loaded rate should have looked like. What is left over after that reconstruction is the part that needs explaining.
Step three: test the structure, not just the price
A competitive rate on the wrong tariff structure still overpays. Your half-hourly consumption data shows whether your load profile fits the structure you are on: flat rate, time-of-use, or pass-through. Benchmarking the structure regularly surfaces more value than benchmarking the rate, and it is the part no quote comparison will ever do.
What to do with the result
If the benchmark shows an unexplained gap, you have grounds to act: renegotiate, restructure, or change the way the contract is procured. If it shows you are paying fairly, you have something almost as valuable, which is confidence and a baseline for the next decision. Either way you are no longer taking the market’s word for it.
Request a benchmark of your current position at /benchmark, or book a review at /book.
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Frequently asked questions
How do I know if my business is overpaying for energy?
You cannot know from the bill alone, because the bill gives you no reference point. You need to separate the commodity cost from the non-commodity components, then compare the commodity element against the wholesale market for the period when your contract was priced. If the gap between what you pay and what the market cost is unexplained, that gap is your answer.
Why can't I just compare my unit rate with another business's unit rate?
Because two unit rates can bundle different things. One may include network charges and levies, another may pass them through separately. They may have been priced at different points in a moving wholesale market, on different contract lengths, with different consumption profiles behind them. A raw unit-rate comparison ignores all of that and will regularly point you in the wrong direction.
Do brokers benchmark my rates for me?
A broker comparison typically shows you the quotes the broker gathered, not your position against the wholesale market. Where the broker’s commission is embedded in the unit rate, the comparison cannot show you the one number that matters most: how much of your rate is energy and how much is intermediation. An independent benchmark separates those components.