There's more power pain to come next year - as Kiwi households can expect a slight increase to their bills come April.

The Commerce Commission has warned the average power bill will go up by $10, and there's room for additional increases to come.

Commissioner Vhari McWha says additional funding is needed to create a safe and reliable power network.

"For Transpower in particular, some of their assets are quite old and they need to be replaced - and some of them are less old and they'll be maintaining those."

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