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 says we're never close to the edge, as the country has a robust power system... and recent events show it responds well.

He says sometimes unusual things happen... but Transpower is a prudent operator, and will ask for a bit more generation when needed.

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