Transmission scarcity is the situation where the demand for transmission of electricity exceeds the available transmission capacity of the grid. So there is a shortage of transmission capacity on the electricity grid.

Transmission capacity is the available capacity expressed in
capacity to move electricity or gas through the electricity grid or gas grid at one moment in time, for example from a production site such as a wind farm to a business park. Electricity is transported through cables and natural gas through pipes. This transport is provided by grid operators. If the transport demand for electricity and/or gas is greater than the capacity of the grid can handle, we speak of transport scarcity. Transport scarcity is also called congestion.

If this is structural, the grid operator will increase the capacity of the electricity grid or expand the grid. This process takes several years.