"Australia should be an energy superpower," National Australia Bank's CEO has told an inquiry. Photo: Lukas Coch/AAP PHOTOS

Australians could have some of the cheapest power bills in the world if the nation's energy resources are better used, a big bank boss says.

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NAB chief executive Andrew Irvine labelled the nation's energy mix "sad" and said achieving net-zero emissions by 2050 was possible if renewables were harnessed.

"Australia should be an energy superpower," Mr Irvine told a parliamentary inquiry into the big four banks on Wednesday.

"We are blessed with incredible amounts

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