The Institution of Engineering and Technology (IET) formed the Power Networks Joint Vision (PNJV) Expert Group from the leading electricity distribution and transmission companies, academia, government and energy consultancies. Their report "Electricity Networks: Handling a Shock to the System" sets out in detail the scale of the challenge, together with a series of proposed ways forward. Power Networks Joint Vision is gathering momentum, with industry and policy makers coming together to give their support and welcome the group's findings. For Britain's electricity industry, the PNJV work highlights the urgent need for whole-system thinking. In this presentation, the speaker discusses the challenges being faced in integrating low-carbon generation to the grid while decarbonising heat and transport and to debate the role of a system architect for the electricity system.