Fidelity Energy has secured over £50m worth of energy supplies under its management just three years after launch.
The Newbury-based business enables resellers to add energy to their portfolios and build on established customer relationships.
MD John Haw said: "This is a significant achievement for the business and testament to the work the team and our partners have put in.
"The portal, a set of exclusive renewable energy offers and marketing support are giving our partners an edge in the market.
"Couple that with their strong customer relationships and it's a winning formula."