Hello,
It seems that your default activity unit for Power is KWH and you have posted a confirmation in a different unit & there are no conversations maintained.
In this case please maintain a conversion factor in the material master and re try, Go to MM02 -> Additional Data -> Units Of Measure and maintain conversion factor for the base unit of measure and alternate unit of measure. Here in your case maintain it between KWH and HR.
Below link might be helpful,
Check if this solves the problem and get back.
Best Regards,
Ameya Beri.