You could apply that to everything. If I turn on (or keep on) my light when usage isn't completely covered by renewables, should that be calculated as using al

You could apply that to everything. If I turn on (or keep on) my light when usage isn't completely covered by renewables, should that be calculated as using all fossil fuels? The logical extension is that everyone should calculate the carbon intensity as a binary choice which is obviously wrong. The only reasonable way to go is to look at the actual carbon intensity average.