Powershop's closest rivals were Energy Online, Energy Direct NZ and Meridian Energy, one of the larger suppliers, which rated between 84 and 81 per cent.
Only 55 per cent were satisfied with bottom-ranked Empower. The Contact Energy-owned company suffered from complaints about high charges and poor service.
Of the large companies, Contact Energy itself was the lowest rated at 66 percent satisfaction. People found it inflexible and difficult to deal with over "issues'', the survey found.
The most common problems with an electricity supplier were poor communications and inaccurate estimates.
Consumer said that depending on where you live consumers should have a choice of between four and nine retailers and dissatisfied electricity customers could always change suppliers.
Overall, 15 per cent of survey respondents had changed electricity suppliers during the previous year.
Powershop chief executive Ari Sargent said the survey shows once again smaller electricity companies were driving higher competition and better service in the industry.
"The Government has run a highly publicised campaign about the benefits of switching. It's no surprise smaller companies like Powershop have been able to show New Zealanders that there are much better alternatives.''
- NZPA