The process of becoming a Rio Tinto Mining Category 3 vendor is not an easy one, but is something that Celtic Power has accomplished. The strict set of guidelines needed to ensure the safety of employees and high level of management involvement is something that sets Celtic Power apart from all other transmission powerline companies. For Celtic Power, having the Rio Tinto Mining Category 3 vendor status means that they are at the top of their game and that they are eligible for many contracts that other companies would not qualify for.