Business Energy Renewal: How to Run Yours Without Overpaying
Most businesses lose money at renewal not because they negotiate badly, but because they start too late. Here is the timeline that actually works.
Business energy renewal – There is a version of renewal where a letter arrives, someone in finance glances at it, and the business signs whatever is in front of them because the alternative is a phone call nobody has time for.
That version costs money. Usually a lot, and quietly.
Start earlier than feels sensible
The single biggest determinant of what you pay is when you start.
Most suppliers will price a renewal up to 12 months ahead of your contract end date, and some go further. That is not a gimmick. It gives you a window rather than a moment, and a window means you can buy when the market is favourable instead of when your contract happens to expire.
Businesses that begin three weeks out have no window. They have whatever the market is doing on the day, plus the weak negotiating position of an obvious deadline.
Our rule of thumb: begin reviewing at least six months before the contract end date, and be in a position to transact from around nine months out if the market moves your way. For larger or multi-site portfolios, start earlier still.
Understand what happens if you do nothing
Doing nothing is a decision, and it is an expensive one.
Let a contract lapse and you land on out of contract or deemed rates, which are set by the supplier and are typically well above anything you would agree in a negotiated deal. On some supplies the uplift is dramatic.
Rollover contracts are the other trap. Historically some suppliers would automatically roll a business onto a new fixed term if no action was taken. Protections have tightened, particularly for micro businesses, but the practical lesson holds: know exactly what your contract says happens at the end date, and diarise it.
The termination notice question
Many business energy contracts require formal notice of termination before you can move supplier. The window is often defined as a period before the contract end date, and missing it can leave you unable to switch.
Two things to get right.
First, find the actual clause. Do not rely on what the sales call said or what the previous contract required. Terms vary between suppliers and between contract generations from the same supplier.
Second, serve the notice in the required form and keep proof. Verbal notice, or an email to the wrong address, has left plenty of businesses stuck for another year.
A good broker handles this as a matter of routine, but the liability sits with the contract holder, so make sure someone owns it.
Why the incumbent’s offer is high
Renewal offers from the existing supplier arrive at a premium. That is not cynicism, it is commercial logic: retention pricing assumes a proportion of customers will accept without testing the market, and pricing for that group subsidises the competitive quotes offered elsewhere.
We routinely see a meaningful gap between a first renewal offer and the best available price for the same supply, same term, same start date. The gap tends to be widest for smaller consumers who are least likely to run a tender.
That does not mean your incumbent is the wrong answer. Once they know they are in a competitive process, incumbents often sharpen up considerably, and there are real advantages to staying put: no objection risk, no billing transition, existing meter arrangements intact. It just means the first number is not the number.
Get the tender right
A renewal that works is really a small procurement exercise.
Data first. Suppliers price what they can see. Twelve months of accurate consumption, half-hourly data where it exists, correct MPANs and MPRNs, current capacity levels. Bad data produces defensive pricing with risk premium baked in.
Letter of Authority. Suppliers will not release pricing or data to a third party without one. Get it signed early, because chasing it mid-tender wastes days you may not have.
Compare like for like. A fixed all-inclusive price and a pass-through price are not directly comparable, and neither is a 12 month against a 36 month at different start dates. Non-commodity costs are the usual source of confusion, and if you are not clear on those, our non-commodity costs guide is the place to start.
Take prices on the same day. Wholesale markets move. Quotes from Tuesday and Thursday are not a fair comparison, and a supplier who looks expensive may simply have priced on a worse day.
Ofgem’s guidance on setting a business energy contract covers your rights through this process.
Term length and the case for flexibility
The default question is one, two or three years. It deserves more thought than it usually gets.
A longer term buys certainty and removes the annual scramble. It also locks you in if prices fall, and three years is a long time in a market that has moved as violently as this one has since 2021.
Shorter terms keep options open but expose you to whatever the market does next.
Above a certain size the fixed-term question stops being the right one altogether. Flexible purchasing, where volume is bought in tranches across a period rather than in a single decision, removes the all-or-nothing timing risk. It requires more management and a higher tolerance for variability, and it is not right for everyone, but for larger consumers it is usually the better structure.
Do not forget what happens after signature
Renewal does not end when the contract is signed. Check the first invoice under the new contract against the agreed rates, line by line. Contract loading errors are common and they do not correct themselves.
That is the point where invoice validation earns its keep, and it is the step most businesses skip.
Contract coming up for renewal? Get in touch early and we will run the market properly for you.
Chris Hurcombe is Managing Director of Catalyst Commercial Services, an independent business energy consultancy based in Birmingham. He works with UK businesses on energy procurement, contract management, and carbon strategy, and writes on energy markets, compliance, and the commercial implications of the UK's net zero transition.
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