Billions of dollars are laid on the table in the latest bidding war to invest in renewable energy infrastructure. : As global leaders double down on their efforts to curb carbon emissions, investment in renewable technology is ramping up. It has been the subject of a bidding war ever since its majority shareholder, Infratil, batted off a $5.1 billion offer from Australian Super to buy it. Nothing became of that offer, but it did give Infratil the idea to see how attractive its 66 per cent stake in Tilt Renewables would be to the market.