ACDC 2012 is the tenth in a prestigious series of IET conferences providing a dual stream two day conference and additional workshop day demonstrating the latest work on AC and DC power transmission.This event is an ideal forum for system owners and operators, regulators, consultants, academics and equipment suppliers to meet and review the state of play in the power transmission business. New challenges are arising from environmental, regulatory, political and social factors, which impact on the development of transmission schemes. The conference addresses these key issues.