One of our largest power companies sees the great potential in the Government's push for geothermal energy. 

The Resources Minister Shane Jones' draft strategy lays out a goal of doubling its production by 2040. 

Mercury Energy Chief Executive Stewart Hamilton says 20% of New Zealand's power already comes from geothermal. 

He told Ryan Bridge it has great opportunities to decarbonise and grow the economy. 

Hamilton says they're currently doing a $300 million extension on one of their geothermal sites, which will produce enough power for the entire city of Wellington. 

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