Transmission capacity (or transportation capacity) is the available capacity expressed in capacity to move electricity or gas at a single point in time through the electricity grid or gas system, 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 transmission shortage or
congestion.