Note difference to installed capacity

rdmolony · rdmolony · commit 2f558d7c345e · 2021-08-30T10:20:10.000+01:00
As surprsingly the parts do not sum to the whole...
diff --git a/_posts/2021-04-07-electricity-capacity-map.md b/_posts/2021-04-07-electricity-capacity-map.md
@@ -12,6 +12,10 @@ read_time: false
 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](https://www.esbnetworks.ie/new-connections/generator-connections-group/availability-capacity-map) or [here](https://www.esbnetworks.ie/network-capacity-map)
 
-> **Caveat:** the ESB substation capacities **do not include** contracted or bid capacity and so underestimate availability. If included, all zones other than Dun Laoghaire Rathdown would likely be close to zero.
+> **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.
+
+**Notes**:
+- `SLR` stands for [Special Load Reading](https://www.esbnetworks.ie/publications) 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.
 
 {% include 2021-04-07-electricity-capacity-map.html %}
