The document discusses the role of electricity grids in enabling the energy transition to renewable energy sources like wind power. It notes that grids provide physical access to electricity markets, allowing for larger market areas and more competition. However, grids can also become bottlenecks if not upgraded. The document outlines plans for upgrades to Nordic electricity grids to handle increasing wind power, including replacing cross-border connections from Finland. It envisions electricity systems becoming part of integrated energy systems and notes that significant grid upgrades are still required for both physical infrastructure and market operations software to achieve this vision.