The digital twin of the Waikato will never do justice to the beauty of New Zealand’s longest river, but it’s almost as powerful, providing real-time simulation and decision support across a complex system that includes 8 historic power stations and multiple traditional communities. It’s just one way the latest digital technologies are being deployed by Mercury NZ, which generates and sells energy to more Kiwi homes than any other provider. We talk to Mercury about decision-making that harnesses both data and generations of operational expertise, across a portfolio of hydroelectric, geothermal and wind power stations.