The units mw and mW are the same. They mean milliwatts. The terms Mw and MW, however, means megawats, which is a billion (1x109) times greater than a mw or a mW.

Another Answer

The correct symbol for a watt is an upper-case 'W'. So the correct symbol for a milliwatt is 'mW' (not 'mw'), and the correct symbol for a megawatt is 'MW' (not 'Mw').

These are the results for 2015:

1. China: 43,530 MW (22.0%)
2. Germany: 39,700 MW (20.0%)
3. Japan: 34,410 MW (17.4%)
4. United States: 25,620 MW (12.9%)
5. Italy: 18,920 MW (9.6%)
6. India: 10,000 MW (5.1%)
7. United Kingdom: 8,780 MW (4.4%)
8. France: 6,580 MW (3.3%)
9. Spain: 5,400 MW (2.7%)
10. Australia: 5,070 MW (2.6%)