Telecom Plus PLC (LSE:TEP) shares jumped over 7% to 1,621.5p after posting results slightly ahead of expectations and giving guidance for "comfortable" double-digit percentage customer growth in the new year.
The Utility Warehouse operator predicts this will lead to a similar increase in adjusted profit before tax.
For the past year 31 March, adjusted PBT increased 55% to £96.2mln, ahead of its previous £95mln guidance, on revenues that more that doubled to £2.5bn on 22% customer growth.
"This has been an outstanding year for the company," said co-CEOs Andrew Lindsay and Stuart Burnett in the statement alongside the results, "the fundamental strengths of our business model have reasserted themselves and delivered a strong outcome for all our stakeholders".
Broker Peel Hunt said: "The noise around the drop in energy prices should now be in the rear-view mirror."
It said this noise was "not surprising, but this has deflected from the underlying strengths of the business as well as the consistency of the model".
Shares in the company in late November rose to an all-time high just above 2,500p before tumbling over 40% as UK energy prices fell.