Watch this extended interview with Origin Energy's Grant King on the effects the carbon price and the Renewable Energy Target. 

Quote: Origin Energy's chief executive Grant King has told Inside Business a low carbon price would 

lead to future investment in coal rather than gas-powered plants.

"If the price was always going to be $6 you'd be building coal-fired power stations," he said.

"A carbon price of more like $40 is necessary to really swing the economics from building 

coal to gas.

"Insofar as we rely on the carbon price to cause different decisions to be made, we've been 

very clear through this debate that $20, let alone $6, will not change the decision to build coal 

instead of gas."