I want to know how much energy it takes The Netherlands each year to
pump the water out of Holland, from the polders, into the canals and
finally into the sea. probably the unit is KilowattHours.

Basically it should be the sum of all water pumps operating day and
night in Holland.

If you can relate the number to total energy use or to other energy
consumers (such as heating buildings or driving), or provide more
interesting related info, I will tip.