"As dairy farming is energy intensive we certainly recommend that farmers check they are getting the best deal possible," Mr Hansen said.
"The more electricity customers who actively shop around, the stronger the competition is among retailers."
In 2012 the authority developed a business tool designed to connect power users and suppliers.
"Businesses submit their details then after a few days they'll receive offers from various suppliers, and then they can decide what option is best for them."
Federated Farmers provincial president Rick Powdrell said many farmers sourced their power through agriculture companies like PGG Wrightsons.
"Many farmers are in bulk buying schemes with other bodies to get power savings. It's no different to anyone saying I want 200 kilograms of potting mix and going down to Bunnings and negotiating a price for 10 tonne because you have got all your neighbours together.
He also questioned whether the Electricity Authority's website was farmer user friendly. "You need to be able to log in and put in multiple power accounts with differing power supply plans. A household will get one power bill, some farmers get three to four power bills and the big dairy farmers could get 10 or 12."
The Electricity Authority said its website did not have the ability to upload multiple power accounts and said there was no plans to upgrade the site.
Continuing hike in power bills were also causing concern and prices spiked.
Labour's energy spokesperson David Shearer said electricity predictions that prices are estimated to rise by just 2.6 per cent over the next few months was laughable.
"Households around the country have received electricity bills with increases of much more than 2.6 per cent in just the last week," Mr Shearer said.