Itaipu - the world's biggest power station (12.600 mega watt)

It took nearly 10 years to finish it (1973 to 1983). workforce: 28,000 Itaipú is 7,7 km long and produces 12,600 mega watt. The main wall is 1,2 km long and nearly 100 m wide. The 18 turbines are the biggest ever designed. Every wheel has a diameter of almost 7 meters, and more than 300 tons.

From: http://www.paraguay-reisen.de/englisch/foziguazue.html