Business energy contract types (UK): a practical guide for small firms
Understand fixed, variable and flexible contracts, what they mean for your cashflow and risk, and how to choose based on your meter, usage and trading setup.
- Clear definitions: fixed vs variable vs flexible (and what “deemed” really means)
- UK-specific caveats: microbusiness protections, meter types, credit checks, direct debit vs invoice
- Decision tools: comparison table, checklist and worked examples with estimated numbers
Information is UK-focused and for guidance only. Prices and terms vary by supplier, meter type, credit status and payment method.
Fast answer: the main business energy contract types (UK)
Most UK small firms choose a fixed-rate contract (usually 1–3 years) for predictable unit rates. If you don’t actively agree a contract, you can end up on a deemed contract with higher rates and tighter terms. Variable and flexible contracts can suit certain trading patterns, higher usage or businesses comfortable with market risk.
If you want predictable bills
Start with fixed-rate quotes. Check contract length, standing charges, and exit fees.
If your usage swings a lot
Consider flexible options only if you understand volume tolerance, pass-through charges and risk.
If you’re moving premises
Plan early: you may be on deemed at the new site until you agree a contract in your business name.
Key takeaway: “Cheapest” isn’t just the unit rate. For small firms, the best-fit contract is usually the one that matches your meter type, payment method, credit situation, and your ability to tolerate price changes (or exit fees).
Business energy contract types explained (with UK details)
Below are the contract types you’ll most commonly see for UK business electricity and gas. Terminology can vary by supplier, so always check the contract summary and the full terms before you agree.
1) Fixed-rate (most common for SMEs)
Your unit rate (p/kWh) is fixed for the contract term. Standing charges may also be fixed, or could change depending on terms.
- Typical term
- 1–5 years (1–3 years is common for small firms)
- Best for
- Budgeting, stable usage, businesses that want price certainty
- Watch for
- Exit fees, renewal windows, pass-through charges, payment method rules (e.g., Direct Debit)
2) Variable (out-of-contract / rolling)
Rates can move up or down. In business energy, “variable” is often what you’re on between contracts, or if you choose a rolling tariff.
- Best for
- Short-term flexibility, bridging while you arrange a fixed deal
- Watch for
- Higher rates vs fixed offers; less certainty for cashflow
3) Deemed contract (when you haven’t agreed terms)
A deemed contract can apply when you take responsibility for a premise’ supply without explicitly agreeing a new contract—common after moving in, taking over a unit, or if your contract ends and you haven’t renewed.
Important: Deemed rates are often higher, and terms differ by supplier. If you’ve just moved in, identify the current supplier and agree a contract (or switch) as soon as practical to avoid paying more than necessary.
4) Flexible / index / bespoke (more complex)
These contracts can track wholesale markets or allow you to buy energy in chunks. They’re more common for higher-usage sites, multi-sites, or firms with energy management support.
- Best for
- Larger SMEs, multi-site portfolios, teams that understand market timing
- Watch for
- Complex billing, volume tolerance penalties, exposure to market spikes, admin time
5) Green / renewable business tariffs (a contract feature, not a separate contract type)
You may be offered renewable electricity backed by certificates (such as REGO-backed supply). The contract can still be fixed, variable, or flexible—so compare structure and total cost, not only the “green” label.
Microbusiness protections (worth checking)
Some UK businesses qualify as a microbusiness (for energy regulation purposes). If you qualify, you may have extra protections around contracts and sales practices. Eligibility can depend on employee count and consumption thresholds.
If you’re unsure, we recommend checking Ofgem’s guidance and asking suppliers to confirm how they treat your account.
Compare business energy deals (whole of market)
Tell us a few details and we’ll match you with suitable contract types and suppliers for your meter and payment preferences. No obligation.
Tip: If you have it, keep your latest bill handy (MPAN/MPRN, annual kWh, current end date). If you don’t, we can still help, but quotes may be less precise until your usage is confirmed.
What we’ll typically check for you
- Contract end date and renewal window (to avoid rollover / deemed periods)
- Meter type: standard, smart, multi-rate (e.g., Economy 7), half-hourly (HH) where applicable
- Payment method suitability: Direct Debit vs invoice, deposit requests and credit checks
- Whether a fixed, variable or flexible structure fits your risk and admin tolerance
Two realistic scenarios (with estimated numbers)
Scenario A: small café on a 12‑month fixed contract
Assumptions (illustrative): 18,000 kWh/year electricity; standing charge 60p/day; unit rate 28p/kWh; single-rate meter; paid by Direct Debit.
Estimated annual energy cost:
- Unit cost: 18,000 × £0.28 = £5,040
- Standing charge: 365 × £0.60 = £219
- Total (excl. VAT): £5,259/year
Why fixed could suit: stable opening hours and predictable cashflow. Check: exit fees if you relocate or close early.
Scenario B: small workshop that drifts onto a deemed contract
Assumptions (illustrative): 12,000 kWh/year electricity; deemed unit rate 40p/kWh; standing charge 80p/day for 8 weeks before switching; then moves to a 24‑month fixed at 30p/kWh and 60p/day.
Estimated extra cost of 8 weeks on deemed:
- Usage over 8 weeks: 12,000/52×8 ≈ 1,846 kWh
- Unit cost difference: (40p − 30p) × 1,846 ≈ £185
- Standing charge difference: (80p − 60p) × 56 ≈ £11
- Estimated avoidable cost: ~£196 (excl. VAT)
What to do: identify the current supplier immediately after moving in, confirm responsibility date, and agree a contract/switch promptly. Rates and terms vary by supplier.
These examples are simplified to show the impact of unit rates and standing charges. Your bill can include additional pass-through charges and taxes depending on supply, meter, and supplier terms.
Compare contract types: which one fits a small UK business?
Use this as a practical guide. Your exact options depend on your meter type (e.g., smart, multi-rate, HH), consumption, credit status and whether you need electricity, gas or both.
| Contract type | Price certainty | Flexibility | Typical risks / trade-offs | Often suits |
|---|---|---|---|---|
| Fixed-rate | High (unit rate fixed) | Medium (term commitment) | Exit fees; renewal timing; may miss future price drops | Most SMEs, single-site firms |
| Variable | Low | High (often short notice) | Can rise quickly; harder budgeting | Short-term needs, stopgap |
| Deemed | Low | Medium (you can usually switch/agree a contract) | Often higher rates; varying terms; can be triggered by moves/takeovers | Businesses that haven’t arranged supply yet |
| Flexible / index | Variable (market-linked) | Medium–High (structure dependent) | Complexity; exposure to spikes; volume tolerance | Larger SMEs, multi-site, energy-managed businesses |
Decision checklist (quick)
- Contract end date: when does your current deal end, and what’s the renewal window?
- Meter type: standard, smart, multi-rate, or half-hourly? (This affects available tariffs.)
- Payment method: can you do Direct Debit, or do you require invoice / BACS?
- Credit/deposit: would a deposit or prepayment requirement cause issues for cashflow?
- Risk tolerance: can you absorb price swings, or do you need fixed budgeting?
- Usage pattern: seasonal peaks, long opening hours, machinery load, electric heating?
Who each option is (and isn’t) for
Fixed: suits most small firms.
Not ideal if you expect to leave the premises soon (exit fees risk).
Variable: suits short-term bridging.
Not ideal if you need cost certainty month-to-month.
Deemed: usually accidental.
Good only as a temporary default while you sort a contract.
Flexible/index: suits active management.
Not ideal if you can’t monitor risk or need simple billing.
Costs, exclusions and common pitfalls (UK small business energy)
A business energy quote is more than a unit rate. These are the items that most often surprise small firms when switching, renewing or moving premises.
Exit fees (early termination)
Fixed contracts commonly include exit fees. If you close, relocate, or change legal entity mid-term, fees may apply. Always ask for the exact exit-fee wording.
Standing charges and pass-throughs
Some costs are fixed daily charges; others can be pass-through network and policy charges. Ask whether quotes are fully fixed or include pass-through elements.
Payment method rules
Some suppliers price more keenly for Direct Debit. Invoice/BACS may be available but can affect pricing, deposits, or credit terms.
Moving in? Avoid “deemed by default”
- Take meter readings on day one (photo evidence helps).
- Find the current supplier and notify them of occupancy/responsibility date.
- Arrange a contract in your business name (or start a switch) promptly.
- Confirm billing address and contact details to avoid missed notices.
Common quote exclusions (ask upfront)
- VAT treatment: most business energy is charged at 20% VAT unless you qualify for reduced rates.
- Capacity / maximum demand charges: may apply for some supplies and profiles.
- Half-hourly settlement / data charges: relevant for HH meters or certain sites.
- Metering work: upgrades/changes are separate from supply in many cases.
Reality check: Business energy contracts and protections are not identical to domestic energy. Always read the contract summary, confirm renewal dates in writing, and keep a copy of agreed rates and standing charges.
FAQs: business energy contract types for UK small firms
1) What is a deemed business energy contract?
A deemed contract can apply when your business is responsible for a supply but hasn’t agreed a specific contract (often after moving into new premises or when a contract ends). Rates and terms vary by supplier and are often higher than negotiated fixed deals.
2) Can a small business switch energy supplier at any time?
You can usually switch when you are out of contract or within any permitted renewal window. If you are in a fixed-term contract, switching early may trigger exit fees. If you’ve moved in and are on deemed, you can typically agree a contract or switch—confirm timelines with the current supplier.
3) What’s the difference between fixed and variable business energy?
Fixed means your unit rate is agreed for the term (helpful for budgeting). Variable means rates can change. For many SMEs, variable is best treated as a short-term stopgap unless you’re comfortable with price changes.
4) Do microbusinesses get extra protections?
Some businesses qualify as a microbusiness and may have additional protections around contract terms and sales practices. Eligibility depends on factors such as staff numbers and energy usage. Check Ofgem guidance and ask the supplier to confirm how they classify your account.
5) How long are business energy contracts in the UK?
Common terms are 12, 24 or 36 months, but you may see shorter or longer deals depending on supplier, meter type and credit checks. Longer terms can increase price certainty but may raise the risk of exit fees if your circumstances change.
6) What information do I need to get an accurate quote?
Ideally: your business postcode, latest bill, current supplier, contract end date, and identifiers (MPAN for electricity, MPRN for gas), plus annual kWh consumption. If you don’t have this, you can still start with the basics and confirm details later.
7) Does having a smart meter change my contract options?
It can. Smart and half-hourly capable meters may open up different pricing structures, especially for businesses with distinct peak/off-peak usage patterns. However, availability varies by supplier and the way your site is settled/billed.
8) Can I get one contract for gas and electricity (dual fuel) for my business?
Some suppliers offer both fuels, but business “dual fuel” isn’t always priced the same way as domestic bundles. It can simplify admin, but it’s still worth comparing each fuel on total cost and terms.
Trust, methodology and sources
Editorial ownership
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- June 2026
How we assess contract types (our approach)
This guide is designed to help UK small firms choose between common business energy contract structures. We prioritise what most affects outcomes in real life:
- Total cost drivers (unit rate + standing charge + likely pass-throughs)
- Risk (price volatility, exit fees, renewal/rollover risk)
- Operational fit (meter type, payment method, admin complexity)
- Eligibility constraints (microbusiness status, credit checks, deposits)
Limitations: We don’t publish live prices on this page because business rates change frequently and can vary by region, meter, consumption and supplier appetite. The scenarios above are simplified and exclude certain charges that may apply to your site.
Sources and further reading (UK)
- Ofgem — regulator guidance on business energy and microbusiness protections
- Citizens Advice: energy supply — practical advice on bills, problems and switching
- GOV.UK — government guidance on business costs, VAT and compliance topics
Ready to choose the right contract type for your business?
Get quote options matched to your meter, payment preferences and timings. We’ll explain the trade-offs clearly before you decide.
Back to Business Energy