One of Australia’s biggest coal-fired power plants plans to close six years earlier than previously announced. The Gladstone Power Station will potentially retire when existing supplies and operational arrangements expire in March 2029, “although no final decision has been made,” majority shareholder Rio Tinto Plc said in a statement on Wednesday. The facility, operated by Houston-based NRG Energy Inc., had been slated to close in 2035. Most Read from Bloomberg Gladstone started operating in 1976 and i ...