How we can make solar power at night (or, how we can use solar heated molten salt as a giant battery at night) | DW
How we can make solar power at night (or, how we can use solar heated molten salt as a giant battery at night) | DW
How do you use solar radiation when you don't receive solar radiation?
Obviously, the answer is you don't.
But I imagine they're doing something funny and like oh we use the radiation to heat molten salt, and when we don't have new solar radiation we use the heat from the salt to generate power... Effectively just a battery system attached to a solar system for a funny headline
Yeah, having just watched the video, that's exactly what they are doing. It's great to be excited, but there's no reason to lie in the title. This is not solar power at night. This is thermal batteries!
I agree, they definitely chose a click-baity title. I'll edit it here to reflect what it really is.
They built a couple of this near Las Vegas in Nevada, USA. The cost of construction was very high as was the cost of maintenance. They were only used while the research was ongoing as the power was never economical to produce. In fact, it would would have been the single most expensive source in the state.
Solar PV and wind on the other hand are some of the cheapest sources. With today's tech, grid connected batteries make even more sense than concentrated solar thermal and molten salt.
According to the video, concentrated solar's costs have come down since those plants near Las Vegas were built, but it's still about 2x more than photovoltaic.
According to that wikipedia article, the Las Vegas plants require substantial amounts of natural gas heat to keep the salt temps up so it'll function into the next day, which the video didn't mention, so now I'm wondering if that requirement has been eliminated from other designs?
I think ultimately you're right in that batteries will serve the need better, especially once cheap sodium batteries become mass-produced for those purposes.
There is also one in Spain, near Sevilla - https://en.wikipedia.org/wiki/Gemasolar_Thermosolar_Plant