The Rjukanfossen has lost its power since the water is diverted in pipelines to the Vemork power station. The waterfall can only be experienced on the last weekend in July on the occasion of the "Marispelet".
From the valley below, you can marvel at the mighty waterfall, which, not surprisingly, serves the region's electricity generation at the Kvitåi hydroelectric power plant. Definitely worth a look, even …
If you're heading north, the descent to Rjukan offers nice views. You'll encounter tunnels and also pass by significant historical sites related to Rjukan's industrial past and its famous World War II "heavy water" history.