Power price rises continue to outstrip inflation due to large increases in monopoly transmission and lines charges.

The Electricity Authority has released its latest annual report.

It shows the lines component of household power bills increased by 6.7% in the three months to June.

That's while retail charges fell by 0.7%.

Monopoly charges are regulated by the Commerce Commission.

But line companies around New Zealand reported before-tax profits of more than $800m for the year ending March.