Electricity grid congestion, what does that tell you ?
Large electric power grids are large and complex structures whose role is to carry electricity, often over long distances. These networks are subject to very strict operating rules, which oblige the operators of the control centers to operate the network within its safety limits. These limits depend on the thermal resistance of the structures, but also on the voltage withstand limits and the network stability limits.
It is said that there is congestion on an electrical network when the physical transit capacities on certain lines are reached. It is therefore no longer possible to increase the flows.
Congestion problems create anomalies in wholesale electricity markets, as some “physical” deliveries may become impossible.
In order to maintain the balance of the electrical network, the network manager will be able in the event of congestion to limit transit either through power clipping at the source, or through the reconversion of surplus energy through storage means available locally.