Close to 4000 people in Wairarapa have switched power companies in the last 13 months, Mercury Energy making the most gains.
Figures released by the Electricity Authority show 4062 customers in the region changed power providers from May 2014 to May 2015.
The authority is urging locals to check all their options rather than settle for their current deal.
Authority acting chief executive John Rampton encouraged more householders to investigate their options.
"There have recently been some new retail brands start up which means customers have more options than ever before. Different retail brands and offers suit different people, so it's important to think about your circumstances. We would encourage Wairarapa customers to shop around as there are definitely good savings around at the moment."