The VVER, or WWER, (Vodo-Vodyanoi Energetichesky Reactor; Water-Water Energetic Reactor) is a series of pressurised water reactor designs originally developed in the Soviet Union, and now Russia, by OKB Gidropress. Power output ranges from 440 MWe to 1200 MWe with the latest Russian development of the design. VVER power stations are used by
1. Armenia
2. Bulgaria
3. China
4. Czech Republic
5. Finland
6. Hungary
7. India
8. Iran
9. Slovakia
10. Ukraine and the Russian Federation.