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How much would additional power cost on a 4U Colocation plan?
It depends of the power supply unit (PSU) of you server.
For 4U server that has 1400W a PSUs, you have to purchase/reserve 5 Amps of additional power. They cost €100/month.
Having reserved 6 Amps (1 Amp + 5 Ams add-on), you should be OK and would not have any additional costs for electricity. If your power usages is less than 6 Amps, we will add credit for unused power to your account. You can use the credit to reduce any of your next bills.