An increase in Transpower's transmission charges looks to be on the cards. 

The state-owned enterprise has submitted its proposed spending to the Commerce Commission for the five years starting April 2025. 

The charges would rise from 8% to 10% of the average household electricity bill, or about $7 a month. 

Chief Executive Alison Andrew told Mike Hosking that it would help pay for the near $5 billion costs ahead for the national power grid. 

She says it will pay for upgrades to ageing assets nearing the end of their life, which would ensure the safe and reliable performance of the grid. 

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