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SmartestEnergy out-of-contract rates, October 2026

SmartFlex tariff: what SmartestEnergy charges a business after its fixed contract ends

SmartestEnergy Limited

SmartestEnergy out-of-contract rates 2026

SmartestEnergy business out-of-contract electricity is 44p per kWh with a 450p daily standing charge, and gas is 8.5p per kWh on 500p a day. This is SmartestEnergy's SmartFlex tariff, which applies when a fixed contract ends and nothing new is signed, from 1 October 2026. We checked them against SmartestEnergy's own schedule on 3 November 2026.

Latest published rates

Effective 1 October 2026
SmartestEnergy out-of-contract rates for business electricity and gas, by published schedule
ScheduleElectricityGas
SmartFlex tariffFixed contract endedShown above44 p/kWh450 p/day standing chargeFrom 1 October 20268.5 p/kWh500 p/day standing chargeFrom 1 October 2026
Deemed tariffMoved into a site SmartestEnergy already supplies, or Direct Debit cancelled64 p/kWh500 p/day standing chargeFrom 1 October 202620 p/kWh600 p/day standing chargeFrom 1 October 2026
SmartFlex tariff, electricity: SmartFlex tariff, non-half-hourly, Profile Class 1-4, effective 1 October 2026. Profile Class 5-8 carries the same 44 p/kWh on 450 p/day. Half-hourly SmartFlex on Low Voltage Band 1 is 41 p/kWh with a regional standing charge from 695.69 to 1,352.68 p/day. Prices exclude Climate Change Levy and VAT. Source
SmartFlex tariff, gas: SmartFlex tariff, all meters, effective 1 October 2026. One rate for all gas meters. Prices exclude Climate Change Levy and VAT. Source
Deemed tariff, electricity: Deemed (Standard) tariff, non-half-hourly, Profile Class 1-4, effective 1 October 2026. Profile Class 5-8 and half-hourly whole-current meters carry the same 64 p/kWh on 500 p/day. Half-hourly deemed is 68 p/kWh in every voltage band, with a regional standing charge from 695.69 to 1,352.68 p/day on Low Voltage Band 1. Source
Deemed tariff, gas: Deemed (Standard) tariff, all meters, effective 1 October 2026. Source
Schedule effective
1 October 2026
We last checked
3 November 2026
Where these come from
Supplier's own published rate schedule

SmartestEnergy runs two variable schemes. A fixed contract that ends without new prices rolls onto SmartFlex, shown here. Its Deemed tariff, for businesses that move into a site it already supplies or cancel their Direct Debit, is much higher. Prices exclude Climate Change Levy and VAT.

SmartestEnergy deemed rates pageSmartestEnergy business website

That is the 8th lowest headline electricity rate of the 16 suppliers we track. Compare all 16 suppliers' out-of-contract rates.

Out-of-contract electricity averages 44.75p/kWh across the 16 suppliers we track. We compare 19 suppliers for you.

Get a fixed price before your next bill

Last reviewed 3 November 2026. Always verify rates with the supplier before relying on them.

What SmartestEnergy calls it, and when it applies

SmartestEnergy calls these rates SmartFlex tariff. It applies when a fixed contract ends and nothing new is signed. SmartestEnergy also publishes Deemed tariff (moved into a site SmartestEnergy already supplies, or Direct Debit cancelled), shown as a second row in the table.

SmartestEnergy says: “If you reach the end of your fixed contract with SmartestEnergy Business and have not agreed new contract prices, you will automatically roll onto our SmartFlex product.” Source

Moved into a premises and never agreed a contract? That is the deemed case: deemed contracts explained.

Your SmartestEnergy contract is ending: what to do

The date that matters most is your notice date, not your end date, because missing it can roll you onto a new term or onto the rates above. Find it on your contract or bill, then get prices well before it. Our guide covers what to do when your business energy contract ends, whether you have six months left or it ended last week.

Not sure who supplies you? Use our business supplier finder.

Frequently asked

SmartestEnergy: questions answered

What are SmartestEnergy business out-of-contract rates?

SmartestEnergy business out-of-contract electricity is 44p per kWh with a 450p daily standing charge, and gas is 8.5p per kWh on 500p a day. This is SmartestEnergy's SmartFlex tariff, which applies when a fixed contract ends and nothing new is signed, from 1 October 2026. We checked them against SmartestEnergy's own schedule on 3 November 2026. Rates can vary by region and meter type, so check the row for your site on SmartestEnergy's own schedule before relying on them.

Is SmartestEnergy's deemed rate the same as its out-of-contract rate?

No. SmartestEnergy publishes its SmartFlex tariff, which applies when a fixed contract ends and nothing new is signed, and a separate Deemed tariff list (moved into a site SmartestEnergy already supplies, or Direct Debit cancelled). The Deemed tariff is electricity at 64p per kWh on 500p a day and gas at 20p per kWh on 600p a day, from 1 October 2026.

How do I get off SmartestEnergy out-of-contract rates?

Sign a new fixed contract, with SmartestEnergy or another supplier. On a variable or out-of-contract rate you can usually switch at any time, although a supplier can object if you owe it money. Our guide to what to do when your business energy contract ends covers each step.

Who owns SmartestEnergy?

SMARTESTENERGY LIMITED (Companies House number 03994598) is part of JPN, incorporated on 16 May 2000.

What is SmartestEnergy's credit rating and financial position?

Based on the latest filed accounts at Companies House, SMARTESTENERGY LIMITED has a credit score of 62/100, a derived risk band of Stable, a recommended credit limit of £20m, turnover of £761m (FY25). Full figures and source filings are in the business profile section above.

What is SmartestEnergy's registered office and how do I contact them?

SMARTESTENERGY LIMITED's registered office is The Columbus Building, 7 Westferry Circus, London, E14 4HD. Public contact details: telephone +448003163105, email customer-services@smartestenergy.com. For broker enquiries via Purely Energy, see the contact panel above.

What are SmartestEnergy's turnover and financial accounts?

SMARTESTENERGY LIMITED's most recently filed accounts (year ending 2025) show turnover of £761m, operating profit of £174m, total assets of £1.8bn, 755 employees. Annual accounts are filed at Companies House and refreshed in our profile monthly.

Is SmartestEnergy safe for business customers?

SMARTESTENERGY LIMITED holds a valid Ofgem electricity and gas supply licence, files audited accounts at Companies House, with latest turnover of £761m. We do not give financial advice; verify the latest filings and any recent enforcement actions before signing a long-term contract.

Can I get a fixed business gas or electricity quote from SmartestEnergy via Purely Energy?

Yes. As an independent broker we tender against SmartestEnergy alongside our panel of 19 UK suppliers. Each quote breaks the unit price into wholesale energy, non-commodity costs, supplier margin, and our broker margin so you see exactly what you are paying. Request a comparison via the buttons above.

At a glance

SMARTESTENERGY LIMITED (Companies House 03994598) is the licensed UK retail entity owned by JPN. Registered office: The Columbus Building, 7 Westferry Circus, London, E14 4HD. Latest filed turnover £761m (year ending 2025) with 755 employees.

Last verified 7 May 2026 · Sources: Companies House (03994598), Citizens Advice non-domestic league table, Ofgem licence register.

SmartestEnergy business contact

Direct lines for business customers

Phone
01903 703400
Email
quote.business@smartestenergy.com; meterreadings.business@smartestenergy.com
Contact page
Open on SmartestEnergy

Sourced from SmartestEnergy's official contact page. Verify before relying on these details for billing or contract-end disputes.

SmartestEnergy is one of the UK's larger C&I-focused suppliers, founded in 2001 and wholly owned by Japanese trading house Marubeni Corporation. The business specialises in renewable PPAs, REGO trading and providing independent generators with a route to market.

Parent
Marubeni Corporation (Japan)
Founded
2001
Headquarters
London
Latest revenue
Not published

SmartestEnergy business profile

Independent company data for the licensed retail entity, drawn from the latest filed accounts and statutory registers. Refreshed monthly. Not a credit recommendation.

Last refreshed 7 May 2026

Risk band
Stable
Score 62/100
Healthy, broadly stable profile with no immediate concerns.
Recommended credit limit
£20m
Provider's guidance, not a Purely Energy recommendation.
Turnover (latest filed)
£761m
Year ending 31 March 2025
Total assets
£1.8bn
Creditor days 39
Headcount (filed)
755
As of 31 March 2025
Next accounts due
31 December 2026
Parent company
JPN

5-year financial trend

Turnover CAGR +32.3% over 4 years

Year endingTurnoverYoY
31 March 2025£761m+52.2%
31 March 2024£500m-26.3%
31 March 2023£679m+168.3%
31 March 2022£253m+2.0%
31 March 2021£248m-

Sourced from filed accounts at Companies House. YoY = year-on-year turnover change. CAGR = compound annual growth rate across the window shown.

Latest filed profit and loss

Year ending 31 March 2025

Turnover
£761m
Gross profit
£334m
Operating profit
£174m
Pre-tax profit
£161m
EBITDA
£180m
Dividends
£142m

Registered office

The Columbus Building, 7 Westferry Circus, London, E14 4HD

London · Tower Hamlets

Auditor

Ernst & Young LLP

Active officers· 57 on the public register

  • MR MASAO IMAZATO· D· COMPANY DIRECTOR· since 2019LinkedIn ↗
  • MR YOSHIHIRO MEGATA· D· DIRECTOR· since 2003LinkedIn ↗
  • MR NOBUHIRO YABE· D· COMPANY DIRECTOR· since 2020LinkedIn ↗
  • MARK LIDDELL HALLIDAY· D· since 2000LinkedIn ↗
  • MR MUTSUMI ISHIZUKI· D· COMPANY DIRECTOR· since 2019LinkedIn ↗
  • KENJI NATORI· D· GENERAL MANAGER· since 2001LinkedIn ↗
  • MR TOMOKI NISHINO· D· COMPANY DIRECTOR· since 2020LinkedIn ↗
  • TATSUYA OZONO· D· DIRECTOR· since 2005LinkedIn ↗
  • MR TATSUYA OZONO· D· COMPANY DIRECTOR· since 2019LinkedIn ↗
  • HIROSHI TOYOSHIMA· D· DIRECTOR· since 2004LinkedIn ↗

Plus 47 more on the public register.

Industry (SIC07)

  • 35230: Trade of gas through mains · ELECTRICITY, GAS, STEAM AND AIR CONDITIONING SUPPLY
  • 35230: Trade of gas through mains · ELECTRICITY, GAS, STEAM AND AIR CONDITIONING SUPPLY
  • 35140: Trade of electricity · ELECTRICITY, GAS, STEAM AND AIR CONDITIONING SUPPLY
  • 35140: Trade of electricity · ELECTRICITY, GAS, STEAM AND AIR CONDITIONING SUPPLY
  • 35200: Manufacture of gas; distribution of gaseous fuels through mains
  • 35130: Distribution of electricity · ELECTRICITY, GAS, STEAM AND AIR CONDITIONING SUPPLY

Trading history and former names

  • FIRESCAPE LIMITED, 2000 to 2000

Outstanding charges

3 on the public register

  • NORD POOL AS · 1 July 2019
  • NASDAQ OMX STOCKHOLM AB · 15 September 2010
  • BRITISH OVERSEAS BANK NOMINEES LIMITED AND WGTG NOMINEES LIMITED · 7 June 2005

Public contact details

Telephone
+448003163105
Email
customer-services@smartestenergy.com

VAT number GB773846584

Sources and references

We are an independent UK B2B energy broker. Profile data is sourced from the public registers above and refreshed monthly. Not a credit recommendation. Verify recent filings before relying on any figure.

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We run your consumption against the UK market and come back with the best fit, with wholesale price, non-commodity costs, supplier margin and our margin shown separately on every quote.

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