Construction started in 2005 and the plant was supposed to be online in 2010. Eleven years later it’s still not operational.
Original budget was 3 billion euros. Current estimate is over 11 billion.
Humans are optimistic. If we knew in the beginning how long something will actually take we never would start many things.
https://en.wikipedia.org/wiki/Hiding_hand_principle
I highly recommend anyone interested in "megaprojects" to listen to this EconTalk podcast episode with Bent Flyvbjerg:
https://www.econtalk.org/bent-flyvbjerg-on-megaprojects/
Very insightful conversation.