Just been searching the net to see what type of data center calculators are out there - and there seems to be a fair few, such as this one ActivePower.
How realistic is it? I bet APC and tohers have a similar one proving that ActivePower is not that efficient. But the numbers at the bottom can be helpful. Budgetholders often do not know what the kW or kWh numbers mean. If you express it in homes powered, EUR/USD, or the percentage that they are closer to their emission targets, it starts to make more sense.