What is the defernce between Mw.hr & Mw?
How could be convert to each other?

I am asuming that "Mw" means Megawatt, which is a unit of power (energy per unit time). But normally this is shown as "MW." Similarly, I am assuming that Mw.hr = Megawatt-hour, which is a unit of energy or work, and typically written as "MW-h".

Since these are two different kinds of measurements, you can't convert one directly to another. However, if you know what time is involved in producing or using power at a particular rate, you can calculate the total energy. For example, if a utility delivers 2 MW of power for a period of 3 hours, the total energy it produces in that time is is 6 MW-h.