[johnnyb9]

Wind power is generally higher at night.

[sparrish]

Can you provide a citation for that?

I can see hundreds of wind turbines from where I live (all the red lights flash in sync on the horizon, it's kinda creepy). There's definitely more wind during the day than at night here.

[Scoundreller]

And/or at least a higher proportion of energy use.

In reality, Apple is making the wrong calc: it should look at what the marginal electric generation carbon output is.