Smartest Energy Supplier Information, Requirements & More

Dual Energy will officially rebrand to SmartestEnergy Business on Wednesday 2nd September 2020. Dual Energy’s official company name will become SmartestEnergy Business Limited. The move follows the acquisition of the business in December 2019 and will enable both companies to strengthen the vision of delivering leading, innovative products and service excellence to the UK energy market.

Through the SmartestEnergy brand, they can achieve a bigger and better future for all stakeholders including customers, TPIs, and employees. The focus is to build on their leading proposition that will reach out to a wider business community, driving a smarter transition to a net-zero carbon economy and best-in-class customer experience. 

SmartestEnergy US LLC is a subsidiary of the Marubeni Corporation of Japan, making them uniquely positioned to leverage global systems and strong financial support. SmartestEnergy is a next-generation energy company, supporting smart businesses through the transition to a decentralized energy system.

Marubeni Corporation



SmartFix – 1, 2, 3, 5 Years

  • Competitive electricity & gas prices including a 1, 2, 3 and 5 year fix (5 year available on electricity only)
  • Control cash flow with monthly Budget Plan payment (fixed Direct Debit)

SmartTracker – 3 years

  • lowest electricity or gas prices fixed for the first 12 months then reviewed year on year against market prices
  • Market review every 12 months ensures you continue to pay a good price for your electricity or gas-based on what the market has to offer.
  • Price Promise Guarantee during your annual market price review, if you find a cheaper price from another supplier, SnartEasy match it.

SmartPay – 1, 2, 3 years

  • Fix competitive prepay prices for up to 3 years, save up to 40% against competitor variable tariffs
  • Guaranteed acceptance, no security deposit – available to all businesses with no or low credit score, plus no security deposit is required
  • Control when you pay – ideal for hospitality businesses with unpredictable cash flow, top-up when it suits you best, credit alerts by SMS/email
  • Easy payment methods – top-up credit online via SmartWeb, by phone, or auto payment via Direct Debit

Office locations

SmartestEnergy Limited:

London office – Canary Wharf
Ipswich office

Terms & Conditions

Terms and Conditions

Deemed Rates

Customer Service and Online Information

SmartestEnergy (Dual Energy) Sales Support Team are always on hand to help with all your inquiries. Opening hours are unchanged; 8.30 am-5 pm Mon-Fri.


Customer Log In

Online Contact Form

Email Address

New Sales Support Email:

New Customer Services Email:

Phone Numbers

Contacting us by phone is easy – just select the relevant number below to reach our customer service team:

Industrial and Commercial electricity supply customer service enquiries: +44 1473 234150 or 01903 703411
Business electricity and gas supply customer services enquiries (formerly Dual Energy): +44 1903 703 400
Smart Generation customer service enquiries: +44 1473 234157

Social Media




Contract Acceptance Requirements

Important: Please note we will not be able to accept any customer contract completed using the Dual Energy verbal script or application form after the 5th of September 2020.