A total of 536,658 consumers switched energy suppliers in March.
This figure, released by Energy UK today, brings electricity switching levels for the first quarter of 2017 above 1.3 million.
This is an increase of 13% on the same period last year.
Around 35% of these changes, totalling 145,000 customers, were people moving from larger suppliers to small and mid-tier offerings.
Lawrence Slade, Chief Executive of Energy UK said: “1.3m consumers switching already this year is further demonstration of competition in action in the retail market.
“Competition is driving up standards, innovation and investment as suppliers compete to keep and attract new customers.”
Millions of householders shopped around for a better energy deal last year, reaching a six-year high.
Big Six supplier EDF Energy is increasing its electricity prices for the second time this year.