N = \frac{2, 25 \times 10^{17} J}{31536000 s} = 7, 14 G W h

${N = \frac{2,25 \times 10^{17} \, \mathrm{J}}{31536000\, \mathrm{s}} = 7,14 \, \mathrm{GWh}}$

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