A map of Medium Voltage (MV) substation clusters. It was created by grouping similarly located MV substations using data from the ESB Substation Capacity map here or here

Caveat: the ESB substation capacities do not include contracted or bid capacity and so overestimate availability. If included, all zones other than Dun Laoghaire Rathdown would likely be close to zero.


  • SLR stands for Special Load Reading which are a coincident set of measurements of simultaneous load for all distribution substations taken each year on a single day by the ESB in both summer and winter.
  • In most zones Demand Available + SLR Load is not equal to Installed Capacity, on average this sum is around 60% of installed capacity for each substation.