He succeeds former managing director Andy Pilley, who has now taken up the role of chairman.
Dilworth has a successful background in financial services. He held a number of roles, including in mergers and acquisitions, before becoming the managing director of a venture capitalist backed business. He first joined BES’s senior management team in April 2016.
Commenting on his appointment, he said: “BES has successfully developed a proposition within the change of tenancy market for small and medium-sized enterprises.
“Combining the current solid market position with the significant investment planned for the business, this will provide an exciting platform for BES to develop further as a challenger brand, which I very much look forward to being a part of.
“Our planned investment in the business will enable us to offer a wider choice of tariffs along with an enhanced customer experience.”
Pilley added: “BES is already a well-established supplier of electricity, gas and telecoms to businesses nationwide, and our focus for the coming years is to continue growing the company in a controlled and compliant way.
“Nick has been working with us since the start of this year and it is clear that he is absolutely the right person to help us oversee the next stage of BES’s journey.”