OSLO (Reuters) - One of the Nordic region's biggest power stations shut Friday to let an expert tune a grand piano for a concert undisturbed by the hum of huge hydroelectric generators.

"When you put a big piano in there, you also need to tune it, and that is very difficult if the machines are running," said Tron Engebrethsen, senior vice president at Norwegian power company Statkraft.

The generators will be switched back on after Friday evening's concert which is being staged in an enormous underground hall at the 1,120-megawatt Sima power plant.

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Having been to Norway this eerily makes sense to me :)