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Supplier profile

SmartestEnergy Business

SmartestEnergy Business is the group’s SME-focused supplier, acquired in 2019 and operated separately from its I&C proposition.

Last reviewed 25 September 2026

Electricity & gasSmall and medium-sized businesses
Legal supplierSmartestEnergy Business LimitedCompany no. 06468946
OwnershipPublic parentPart of SmartestEnergy, wholly owned by Marubeni Corporation.
FoundedLegal entity incorporated 2008; acquired by SmartestEnergy in 2019Worthing, West Sussex
Supply focusElectricity & gasSmall and medium-sized businesses
Energy account manager meeting a retail business owner, relevant to smartestenergy business
Supplier suitability depends on the premises, consumption and service required.

Company and ownership

Who owns SmartestEnergy Business?

Part of SmartestEnergy, wholly owned by Marubeni Corporation.

Ownership structurePublic parent
Marubeni Corporation — TSE: 8002

A quoted parent’s share price changes throughout the trading day. The link above goes to the parent company’s investor information rather than displaying a price that could quickly become stale.

Group relationships

Affiliations and related businesses

SmartestEnergyMarubeni Corporation

Related companies can share a parent or brand while remaining separate legal entities. Check the company named in the principal terms, on the bill and in the complaints procedure before relying on a group relationship.

Operations team reviewing business energy service and renewal records, relevant to smartestenergy business
Reliable account records make supplier reviews and renewals easier.

Commercial fit

What the supplier offers

  • SME electricity and gas
  • Fixed-price contracts
  • Online account and smart-meter support

Renewable position: Renewable electricity options are available through the wider SmartestEnergy proposition; check the specific SME product evidence.

Citizens Advice non-domestic performanceRank 12
879.5weighted points per 10,000 customersApr–Jun 2026

This is an independent complaints indicator, not a customer-satisfaction score. Lower is better. It reflects cases reaching Citizens Advice, its Extra Help Unit and the Energy Ombudsman, weighted by severity and divided by customer numbers.

Before signing

Points to check

  • Do not assume I&C SmartestEnergy products apply to this legal entity.
  • Check renewal, deemed-rate and third-party commission terms.
  • Recalculate the quote with your own annual consumption, contract dates and every known fee.
  • Confirm broker remuneration, renewal terms, payment method and the complaint escalation route in writing.
Business energy customer-service adviser helping a company owner, relevant to smartestenergy business
Service access and account support matter after a business energy contract begins.

Sources

Ownership, company and product information checked against:

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