A positive financial result has gentailer Meridian thinking about infrastructure upgrades. 

It recorded a half year profit after tax of $227 million.

Chief executive Mike Roan says they're considering increasing capacity at the Pukaki dam in the Mackenzie basin. 

He says it's still early days though. 

"The question that I've asked the team is - is it economic to do it? Does it actually make financial sense to expand the amount of hydro storage that we've got?"

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