Business energy is one of the few costs where when you buy matters almost as much as who you buy from. Get the timing right and you can lock in a fair rate for years. Get it wrong and you drift onto some of the most expensive tariffs on the market.
The most expensive place to be: out of contract
When a fixed contract ends and you haven’t arranged a new one, suppliers move you onto “deemed” or “out-of-contract” rates. These are set by the supplier, not competed for, and they are typically far higher than anything you’d agree in a negotiated contract.
If you’re out of contract right now, that’s the single biggest thing to fix. You can usually move to a fixed rate quickly and start saving immediately.
When to renew: earlier than you’d think
Unlike home energy, business energy contracts can usually be secured well in advance — often up to 12 months before your current one ends. That’s a real advantage: it lets you lock in a good rate during a favourable market rather than being forced to accept whatever’s available on the day your contract expires.
A sensible rhythm:
- 12–6 months out: start watching the market and get indicative quotes.
- 6–3 months out: if rates look good, secure a new contract to start when the old one ends.
- Inside your renewal window: don’t let it lapse into deemed rates — that’s the trap.
Fixed vs flexible
- Fixed contracts lock your unit rate for the term. Best for budgeting certainty, which most small and medium businesses value.
- Flexible contracts let you buy energy in blocks and can suit larger users who can watch the market — but they carry more risk.
For most businesses, a fixed contract secured at the right time is the sensible choice.
What to check before you sign
- The unit rate (p/kWh) and the standing charge
- Contract length and exact end date
- Whether it’s a single-site or multi-site agreement
- The renewal/notice terms so you don’t roll onto deemed rates next time
Where HappyBiz fits
Send us a recent bill and we’ll compare fixed and flexible options across our UK supplier panel, factor in your usage and meter type, and — importantly — track your renewal date so you never slip onto deemed rates again. The comparison is free and the switch is handled for you.
