This is actually one of the 4 small generators in this 3rd power plant. There are two larger ones in this building, too.
Note the 600,000 kw? That's six million 100 watt bulbs from this one generator. This one powerhouse can develop over 4.2Gw (call it 2 nuclear power plants).
The whole damn dam can currently produce over 7 gigawatts. And they are planning to install bigger, more efficient dynamos.