ADC Energy, an Aberdeen-based offshore rig inspection firm, has announced the completion of a trial with 'a major rig owner' that found that an upgrade to Dynamically Positioned (DP) rigs power systems can reduce carbon emissions by nearly 5,000 tonnes per year.'Typical DP drilling units operate in HV split-bus, or open-bus, configuration with the power management switchboards operating in silos, using an independent island philosophy…