The Giant Sun Mirrors of Rjukan

Rjukan is a small industrial town in the municipality of Telemark, in Norway, that lies at the bottom of a deep valley at the foot of the mighty Gaustatoppen mountain. The steep slopes of the surrounding mountains completely block out the sun for half the year, leaving this thriving community of 3,400 in permanent shadow from September to March. But since 2013, the town’s residents has been basking under a tiny patch of sunlight that falls right over the market square. This light is reflected from three large heliostatic mirrors called “Solspeil” installed on the mountainside about 450 meters above the town’s square. The mirrors capture the sunlight and direct it into the market square where it illuminates an area of about 600 square meters. Controlled by computers, the mirrors follow the sun’s movement across the sky, moving every 10 seconds so that Rjukan’s square remains sun drenched for the entire length of the day. Photo credit The plan to illuminate Rjukan was first drawn up 100 years ago by the town’s founder and industrialist Sam Eyde, who started a fertilizer factory there. Rjukan was chosen because it was near a 104-meter waterfall, which provided easy means of generating large quantities of electricity. It is estimated that Eyde spend about two times the national budget of Norway to build Rjukan and his factory. But Eyde couldn’t implement his idea for the technology wasn’t there. Instead, his company paid for the construction of a gondola in 1928, which the townsfolk could use, for a small fee, to ride nearly 500 meters up the mountain and into the sunlight. This gondola is called Krossobanen and it remains functional still today transporting thousands of people to the mountains every year. Photo credit The idea to light up Rjukan was revived in 2005 by Martin Andersen, an artist and resident of the town.