National Grid has legally separated out electricity system operation. In the press, this is hailed as the opportunity to make generation zero carbon – surely the separation was unnecessary for that. What is needed is the harder task of efficiency in the trade-off of investment in network against cost of congestion management. There was talk of Competitively Appointed Transmission Owners (CATOs), but several questions about this need to be explored. This viewpoint asks the questions: are there real benefits for the consumer from a more complex regulatory structure for transmission ownership and operation and how can these benefits be realised? READ ECA VIEWPOINT HERE