Switzerland bolted 5,000 solar panels onto a dam wall 8,000 feet up in the freezing Alps. The plant now makes three times more winter power than any farm down in the valleys

2026-07-06 12:59 UTC

Up on the dam, almost everything that looks like a problem becomes an advantage. The plant sits above the fog line, in thin, clear air that lets far more sunlight through. The higher you go, the stronger and cleaner the sunlight becomes. Cold actually helps, because solar panels work more efficiently when they are not baking in heat. And then there is the snow, which acts like a giant mirror, bouncing extra light up onto the panels from below. Scientists call it the albedo effect, and it can lift a mountain plant’s output well beyond anything possible in the valley. A test site at a similar height recorded yearly output far above a typical Swiss plant.

Replies (4)

@NaibofTabr@infosec.pub 2026-07-06 20:27

Maintenance access looks like a pain in the ass, and I would wonder about possible issues with snow/ice buildup and load limits, but otherw8se this is a nice use of the space.

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@jpreston2005@lemmy.world 2026-07-06 17:26

…the assumption was simple, that solar belongs low and warm, on sunny roofs and flat fields, not up in the freezing thin air of the mountains. Well that’s a stupid assumption. what other kind of electronic works better when it’s super hot?? The country makes plenty of power in summer, but runs short in winter, when demand climbs and it has to import electricity. That gap is set to grow as the nation closes its nuclear plants. Damn, two stupid ideas from the Swiss. At least the fabled “someone” put those solar panels up there. 🙄

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@A_Random_Idiot@lemmy.world 2026-07-06 19:59

I would think solar would be even more efficient high up in mountains. Colder temperatures mean they’d stay cooler, produce more power, and for longer… and they are higher up in the air, so amount of photons hitting the panels has to be higher than at sea level, too, further increasing power generation. At least thats what I’d assume, applying some common sense and a little educated guessing.

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@TheStaffmaster@lemmy.world 2026-07-06 21:02

I’ve thought for YEARS that we should to the same thing with the Hoover Dam. Should also mount wind turbines on the face of it to catch the updrafts out of the canyon. You all acting like green energy has to be mutually exclusive to one another. Wind turbine blades have a lot of surface area that could be covered in solar panels, which solves the issue of solar panels energy output decreasing with heat because then they’d always have built in cooling. No wind? There’s still light and some wattage is better than no wattage. Put the turbine blade head on a giant hinge and they can catch rising air from the grounds’ radiant heat at night. Free energy is everywhere if you just know where to look and how to take advantage of it.

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