Wikipedia
Powershop is an online electricity retailer, originally founded in New Zealand and available in Australia as well. Powershop is a 51% New Zealand state-owned enterprise and claims to be the first electricity company in the world where consumers can choose between different brands of electrical power listed on the website and switch between them with the click of a button. Different brands of power may offer lower prices, sponsorships or environmental benefits. Users can either let the system automatically buy power from the cheapest supplier, or log in regularly to take advantage of specials. Powershop initially claimed it would always be the cheapest company for the "typical" consumer in New Zealand. This claim was later dropped.
Powershop was found to be the cheapest electricity retailer for the typical consumer in the main centers by the Ministry of Economic Development. It was the best company in Consumers' Institute of New Zealand's 2011 survey of electricity companies. 96% of Powershop customers found it 'good' or 'very good'. Powershop was rated 96% again in 2012.