Europe

1519 readers

404 users here now

News and information from Europe 🇪🇺

(Current banner: La Mancha, Spain. Feel free to post submissions for banner images.)

Rules (2024-08-30)

This is an English-language community. Comments should be in English. Posts can link to non-English news sources when providing a full-text translation in the post description. Automated translations are fine, as long as they don't overly distort the content.
No links to misinformation or commercial advertising. When you post outdated/historic articles, add the year of publication to the post title. Infographics must include a source and a year of creation; if possible, also provide a link to the source.
Be kind to each other, and argue in good faith. Don't post direct insults nor disrespectful and condescending comments. Don't troll nor incite hatred. Don't look for novel argumentation strategies at Wikipedia's List of fallacies.
No bigotry, sexism, racism, antisemitism, dehumanization of minorities, or glorification of National Socialism.
Be the signal, not the noise: Strive to post insightful comments. Add "/s" when you're being sarcastic (and don't use it to break rule no. 3).
If you link to paywalled information, please provide also a link to a freely available archived version. Alternatively, try to find a different source.
Light-hearted content, memes, and posts about your European everyday belong in [email protected]. (They're cool, you should subscribe there too!)
Don't evade bans. If we notice ban evasion, that will result in a permanent ban for all the accounts we can associate with you.
No posts linking to speculative reporting about ongoing events with unclear backgrounds. Please wait at least 12 hours. (E.g., do not post breathless reporting on an ongoing terror attack.)

(This list may get expanded when necessary.)

We will use some leeway to decide whether to remove a comment.

If need be, there are also bans: 3 days for lighter offenses, 14 days for bigger offenses, and permanent bans for people who don't show any willingness to participate productively. If we think the ban reason is obvious, we may not specifically write to you.

If you want to protest a removal or ban, feel free to write privately to the mods: @[email protected], @[email protected], or @[email protected].

founded 4 months ago

MODERATORS

[email protected]

Iceland Could Become First Nation To Get Solar Power From Space In 2030 (www.iflscience.com)

submitted 2 weeks ago by [email protected] to c/[email protected]

20 comments fedilink hide all child comments

UK-based company Space Solar is partnering with Reykjavik Energy and Icelandic sustainability initiative Transition Labs to develop a space-based solar power plant that can deliver about 30 megawatts of electricity – potentially enough to power between 1,500 and 3,000 homes – from 2030. The system will collect sunlight in space through solar panels and then transmit it as radio waves at a specific frequency to a ground station, where it will be converted to electricity for the grid.

The satellite is expected to be scalable and quite big. Even if a full version of their CASSIOPeiA power array is not built, we are talking about the heaviest single object in space that is not a space station, and when all the arrays are splayed out, much larger than the International Space Station.

The company aims to have a scaled-up version of the system in space by 2036, which would supply gigawatts of electricity.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 4 points 2 weeks ago

Also, can someone please explain how the fuck we wirelessly transmit electricity

It's not electricity per se which is transmitted, i.e., electrons which pass through some material (like in cables, or through air when a lightning strikes and the air becomes a plasma through the electric ionization process).

It is radio waves. Electromagnetic waves of a specific spectrum. Like light, WiFi, TV signals (via antenna), Lasers, etc..
It is a form of energy transmission.

There is a whole field about wireless power transfer. One of them some use everyday: wireless inductive chargers for some smartphones or electric toothbrushes. Those rely on the Lorentz force: if you create a varying magnetic field on the one side and have a coil on the other, you can transfer energy. Read up on Lorentz forces and magnetic induction if you want to learn more. Faraday's law of induction would be another good read.

Regarding the spacey stuff, that's trickier. Applying Lorentz principles here on such a scale would be extremely inefficient and probably dangerous as you would need to create an enormous magnetic field. So using focused beams of radio waves has much less losses. Depending on the type of radiation, or wavelength to be more precise, microwaves or even lasers are used for the transmission, whereas microwaves are preferred due to less atmospheric scatterings. They are not allowed be too strong as that would pose several hazards. Instead it has signal strenghts which are safe. To maximize throughput multiple beams could be used.
Important: this is now electromagnetic stuff, not purely magnetic stuff as with the inductive chargers.

So how does this work from source to receiver?

Source: Sun, emits a shitload of light, other radiation and therby energy.
Sunwaves hit photovoltaic panels on the satellite.
Panels generate direct currents by this.
Direct current gets converted into alternating current (we need this to create electromagnetic beams)
AC gets formed into beams (electromagnetic waves such as microwaves) and emitted at a specific location on earth.
On earth some form of antenna receives these beams. Due to the way these antennas work, an electric alternating current is generated. (See dipole antenna for a simple example.)
This AC needs to go through some transformations to meet some electric specifications to be directly feeded into the elctric grid.
Alternatively can be transformed into DC again and directly be used, stored in batteries or, depending on the grid, be feeded into that.

Done.

Question, if electricity can be transmitted as a radio signal, why could we generate power here on earth in areas where renewables are super abundant (turbines in the ocean, giant waterfalls, deserts for solar, et cetera) and transmit that around the earth to areas where it's needed? Why does it have to be in space for this to work?

In theory, we absolutely could do that. This has some practical limitations though which makes it more complicated and less efficient.

Transferring energy on a more "horziontal" way on earth would need to overcome a plethora of obstacles like buildings or mountains. Furthermore such long range transmissions would suffer from a lot more atmospheric scattering, be sensitive to moisture and weather conditions etc. Also, we would need to have large antennas and tightly focused beams which is a big technical challenge and would further loose efficiency, especially over long dictances.
We would also need to guarantee much more "safe corridors" to efficiently transmit without causing harm. And over long distances within the atmosphere the beams must be much stronger to effectively carry enough energy, as much is lost due to scattering, absorption etc.. From space a lot of these difficulties don't exist or don't have such a large impact. On very short distances should be less of a problem.

I can imagine, however, transferring energy into space to a satellite, which then forwards it to another receiver at a very different place on earth. Such relay satellite concepts are also not new as I've seen. They've just not been made yet. But that's surely just a question of time. They face further challenges, since at each intermediate power station you have energy losses, but they could provide much more flexibility. I don't see this as an issue which can't be overcome.

Sry if this answer isn't really polished. I tried to convey the most important aspects and am too tired for anything more. Hope this helps.