Domestic panels are what we call embedded generation - they are connected to the distribution networks, not the main transmission network. The System Operator (NGESO) doesn’t have real-time insight into the distribution networks themselves - they are just visible as a net demand on the system. Embedded generation serves to reduce this demand by feeding power locally to the distribution network.

We can forecast the embedded generation in real-time, but it’s only post event once the meter data has been accounted for that we know what actually happened.