Contact Energy says potential electricity shortages shouldn't worry people.

It follows concerns being averted both last night and last week, after warnings there were risks of insufficient power generation and reserve to meet demand.

Chief Executive Mike Fuge told Mike Hosking we're never close to the edge, as the country has a robust power system and recent events show it responds well.

“Sometimes unusual things happen, Transpower as a prudent operator steps in and says we need a bit of generation, we need a bit of demand response.”

It's unclear if overnight outages in Wellington's Miramar and Seatoun were related to the Transpower warnings.

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