Consumers will be feeling unsettled as the reliability of electricity supply is tested. 

A cold snap and low wind generation meant the country faced a potential supply shortfall, and Transpower asked people to reduce electricity use between 7 and 9am. 

Consumer Advocacy Council chair Deborah Hart says this kind of situation is not new, but the market model is obviously not working. 

She said that we need to turn our attention from only building infrastructure to delivering energy efficiency and innovation. 

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