[sdab]

The article refers to 1180 MW of _power_. MW is joules/s and the unit of power is the watt (j/s). Your math talks about MegaWatt-Hours.

These are often confused in articles, do you happen to know if that was the case in this article? Did they mean 1180 MWH or 1180 MW as stated? Otherwise your yearly production calculation is very off. 1180 MW (j/s) would produce 10^7 MHW per hour.

[Monkeyget]

It's megawatt hour.