FERC’s landmark transmission planning order – Order No. 1920 – will require changes to how America builds up its transmission system, the backbone of our electric grid. Fundamental to this new process will be a formalized role for states in deciding how transmission lines are planned and paid for. The ruling has the potential to transform our system by encouraging cooperation and prioritizing system reliability and affordability. Getting it right will require a new approach by many stakeholders, and will especially require robust state engagement.