[woeh]

If it would be relevant for the models (e.g. to prepare for prolonged cloudy periods where the net has to step in more), I suppose you could account for rooftop generation in your models by comparing energy consumption from the net on both cloudy and sunny days.

[ggm]

Good point. Except, lack of sun probably changes use of both AC (ok its britain: they dont HAVE AC but they do have heat pumps) and hot water/heating systems, a bit. So it would be setting an error bar on it maybe