Can you please tell me how much kWh the Xbox one and Xbox one consumes. And how much KWh in Lower Saxony?
And how much KW / h in Lower Saxony * cost *? That depends on the electricity provider. You can google the power consumption, that's not so hard, that should be done.
112W. Rest can you think yourself
KWh is not a power unit but an amount of energy, so it is not consumed.
I do not know exactly how much the Xbox consumes would tap on about 150W. A kWh costs, depending on the provider, usually around 30Ct.
Not unimportant is the panel that you use to gamble. A 24 "monitor usually consumes no more than 30W, a 55" TV likes 100W, a beamer often over 250W.