Wouldn't MWh/h be the same as MW???
MW is a unit of power. MWh is a unit of energy.
MWh/h is a unit of AVERAGE power during a certain period, so it is used to show ENERGY consumption.
For example, I as a consumer can be buying power from the utility with a 1 MW power (that is, I pay to have a MAXIMUM DEMAND of 1 MW) but I only consume 12 MWh of energy per day, so I have an ENERGY consumption equivalent to 0.5 MW - flat.
To distinguish between one and the other, the first is referred to with MW, while the second one might be referred to as MWh/h.
agreed, it is power companies trying to keep their end simple consistent.
As people are generally billed in kWh or (MWh for big business?) it is simpler to indicate the a unit of power per time period.
* kWh and MWh are alternatives to joules for representing an amount of energy, * kWh/h and MWh/h are alternatives to kW and MW for representing power (or energy production/consumption).
As appliances as generally rated in W (or kW) telling people they have been charged for 100MJ of electricity might be confusing to the end user, so instead they have opted for kWh as the unit for energy. The kWh/h and MWh/h is just an extension of that, to provide end users with units that have meaning to them.
For example Fingrid is now generating enough power to supply a 1,000,000 fridges (assuming 1kW fridge). So it does make sense, in weird non scientific kind of way
It clearly makes sense. Consider it as Joules rather than kWh:
kW = J/s Instantaneous energy consumtion. A graph would often look like white noise.
kWh/h = J/h Energy consuption per hour, you will see the morning, dinner and night in a graph.
kWh/month = J/month Energy used per month. In a graph you see summer and winter.
kWh/y = Joule per year Energy per year. In a graph you will see "hot" and "cold" years and climate change.
For the total world consumption:
16 kWy/y ca 400 EJ/y = ExaJoules per year. To write 16 kW here would express worlds instant energy consumption or Joules per second, not very informativ.
All are energy per unit time, but by changing the actual time periode one can address different aspects of energy consumtion.
Most people are using this kind of unit all the time. How much electric energy does your house consume per year? Let’s say 20000 kWh. How would you write this in short hand? 20000 kWh/yr.
Makes sense, doesn’t it? Would it be as clear if I wrote: 20000/(355*24) = 2.28 kW? How much electric energy do you pay for with a larger house, 3.1 kW? But energy is measured and priced in kWh, not in kW which is energy per second, i.e. power, not energy.
The unit kWh/h expresses that you use x kWh energy each hour while kW tells what you are using per second.