Around 100 call centre staff have been hired by a Swansea firm in the last three weeks.
The Save Britain Money group, based at Matrix Park in the Enterprise Park, now employs more than 500 staff at its Swansea site with the majority working on its Nationwide Energy Services arm.
Save Britain Money has also acquired energy switching brokerage and consultancy Billscutter and relocated its Welsh administration office from Porth to its Swansea headquarters.
CEO Neville Wilshire said: "The continued growth at Save Britain Money is testament not only to our business strategy but to the quality of the staff we have been able to recruit from the Swansea area."
Billscutter employs around 40 staff.