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Should space-based solar power be part of our clean-energy future? Emergency Portable Power

Beaming solar power from space used to be considered science fiction. But in recent years, space agencies from all over the world have launched studies looking at the feasibility of constructing orbiting power plants for real. 

Such projects would be challenging to pull off, the stakeholders agree, but as the world's attempts to curb climate change continue to fail, such moonshot endeavors may become necessary. 

According to the United Nations' Panel on Climate Change (opens in new tab) , the world is currently on track to warm by 4.5 degrees Fahrenheit (2.5 degrees Celsius) by the end of the century. That is 1.8 degrees F (1 degree C) above the threshold considered safe by the international climate science community to avoid disastrous climate change consequences. 

In fact, to limit the warming to anywhere near that threshold, the world's economies would have to cut down their greenhouse gas emissions by 45% by 2030. That would mean phasing out a lot of fossil-fuel-guzzling technology in a very short period of time.

For example, the United Kingdom would need at least 30 to 40 gigawatts of new on-demand sustainable power generation to get rid of all fossil fuel power generation (according to a 2019 statement (opens in new tab) ). That's the equivalent of building over 30 new nuclear power plant blocks. 

Solar power plants in space, exposed to constant sunshine with no clouds or air limiting the efficiency of their photovoltaic arrays, could have a place in this future emissions-free infrastructure. But these structures, beaming energy to Earth in the form of microwaves, would be quite difficult to build and maintain. 

Here are the main pros and cons of this technology. 

Related: A solar power plant in space? The UK wants to build one by 2035.

Ian Cash is a British engineer, whose CASSIOPeiA Solar Power Satellite concept has been adopted by a U.K. government-backed space energy initiative as a starting point for a potential future space-based solar power plant demonstrator. A staunch advocate of the technology, Cash thinks that developing and building a solar farm in space presents fewer challenges than cracking nuclear fusion. 

When it comes to space-based solar power, "there is no science to solve," Cash told Space.com. "We have it all worked out pretty much since the 1970s, when NASA with the U.S. Department of Energy conducted a very large-scale study. We've proven the physics behind this ever since we first launched a communication satellite into geostationary orbit. You've got solar wings, which face the sun. And you have the body of the satellite, either with a parabolic dish or a phased array antenna, which faces the Earth. All the principles are the same; you're converting solar energy to electricity, converting it to microwaves and beaming it to Earth. The only thing that's different is the scale of the apertures."

Andrew Wilson, a researcher at the Advanced Space Concepts Lab at the University of Strathclyde in Scotland, who led a study looking into the feasibility of space-based solar power, agrees: "I don't think there's technology that needs to be developed as opposed to just advancing through the technology readiness levels," Wilson told Space.com. "There's nothing really that needs to be invented."

However, as detailed later in this piece, the required "technology advancing" is rather considerable.

Building solar power plants in space certainly isn't an easy task, but it seems to have advantages — at least for some countries. The technology's proponents claim that a solar-power plant in Earth's orbit would produce 13 times more power than an equivalent installation located in the notoriously cloudy U.K. 

Space-based solar power plants would easily produce gigawatts of power, matching the electricity output of nuclear power plants. In contrast, the U.K.'s largest solar power plant, Shotwick Solar Park (opens in new tab) in northern Wales, produces a meager 72.2 megawatts during peak insolation times. Only the world's largest solar plants, sprawling installations in some of the sunniest countries, reach the gigawatt mark. For example, the Bhadla solar farm in India generates up to 2.7 gigawatts and covers 52 square miles (160 square kilometers) of land, which is more than double the size of Manhattan, according to the Ecoexperts.

Building a solar power plant in space would come with an enormous price tag. Once built, however, the plant would pay for itself much faster than any Earth-based renewable power generating technology, according to Wilson. 

Ian Cash is a British electronics engineer and director of International Electric Company. His concept of an orbiting solar power plant called CASSIOPeiA (Constant Aperture, Solid-State, Integrated, Orbital Phased Array) has been adopted by the U.K. Space Energy Initiative as a starting point for a possible future space-based solar power plant demonstration. The initiative believes such a demonstrator could be in orbit by the mid-2030s. 

Space-based solar power doesn't suffer from the main drawback plaguing most main renewable energy generation technologies. In space, the sun always shines. No clouds ever block the sun's rays from reaching photovoltaic arrays. And if you choose the orbit wisely, you can even avoid the night. A solar power plant in space, unlike its equivalent on Earth, or an off-shore wind farm, would provide a constant amount of power 24/7 year-round. This power would feed Earth-based power grids at a steady rate without having operators worry about pesky blackouts or sudden overloads.

Space-based solar power proponents, however, don't expect the heavenly electricity to push out more humble ground-based renewables. They think space-based solar power should replace power plants that are currently being used to cover energy needs when the sun doesn't shine and the wind doesn't blow. In the U.K., this so-called dispatchable power comes mostly from oil and gas-fired power plants, the type of carbon-producing facilities that are adding to the world's growing climate-change problem.. 

"The thing with space based solar power is that very high levels of power can be delivered, similar to nuclear power plants," Wilson said. "Most other renewable energy options can't provide such quantities at once. Without space-based solar power, we would probably be looking to build many more nuclear power stations, for sure."

Of course, renewable power could be fed into giant batteries in times of surplus generation to be used at times of need. But energy storage technology of this scale is only slightly more solved then nuclear fusion. 

Space-based solar power doesn't suffer from the main drawback plaguing most main renewable energy generation technologies. In space, the sun always shines. No clouds ever block the sun's rays from reaching photovoltaic arrays. And if you choose the orbit wisely, you can even avoid the night. A solar power plant in space, unlike its equivalent on Earth, or an off-shore wind farm, would provide a constant amount of power 24/7 year-round. This power would feed Earth-based power grids at a steady rate without having operators worry about pesky blackouts or sudden overloads.

Space-based solar power proponents, however, don't expect the heavenly electricity to push out more humble ground-based renewables. They think space-based solar power should replace power plants that are currently being used to cover energy needs when the sun doesn't shine and the wind doesn't blow. In the U.K., this so-called dispatchable power comes mostly from oil and gas-fired power plants, the type of carbon-producing facilities that are adding to the world's growing climate-change problem.. 

"The thing with space based solar power is that very high levels of power can be delivered, similar to nuclear power plants," Wilson said. "Most other renewable energy options can't provide such quantities at once. Without space-based solar power, we would probably be looking to build many more nuclear power stations, for sure."

Of course, renewable power could be fed into giant batteries in times of surplus generation to be used at times of need. But energy storage technology of this scale is only slightly more solved then nuclear fusion. 

The apparent sabotage of the Nord Stream gas pipelines in the Baltic Sea that shocked the world in September 2022 showed that, in the politically unstable world that we live in, relying on energy from abroad is rather unsafe. 

Space-based solar power, proponents say, is more secure from international conflict than gas supplies from Russia — and more secure than traditional solar plants here on Earth as well.

"Some people say that if you strategically place solar panels in certain unpopulated regions in, for example, the Sahara desert, you could power all humanity's energy needs," said Wilson. "But the same thing that we have seen happen with Russia could then happen to our energy security if a war erupted in the Sahara region."

Some opponents argue that a space-based solar power plant could be easily attacked by anti-satellite missiles. Cash, however, disagrees. Shooting down a platform in geostationary orbit, he says, is outside of the current capabilities of most states. On top of that, while disrupting undersea pipelines in a stealth way using submarines allows for plausible deniability, an adversary launching a missile to destroy a space-based solar plant of a rival would be easily identified.

"There certainly is a risk, but it's no greater than hostile players wanting to attack nuclear power stations, gas pipelines or high voltage power line cables running between continents," Cash said. "Many of these things can be attacked covertly, and the attacking nation can easily deny responsibility. But in space, any attack involves a launch that will surely be detected."

Wilson added that, as any space-based solar power plant project will most likely be an international endeavor, the international nature provides an extra layer of protection against political upheavals. 

Photovoltaic plants on the ground devour huge areas of land to harvest any reasonable amount of power. Wind farms in the landscape, too, are unmissable. The rectifying antennas (or rectennas) needed to receive microwave beams carrying solar power generated in space would too require a huge footprint. These rectennas will, however be far less obtrusive, claimed Cash, and allow for other uses of the land or sea on which they will be built. 

"The rectennas will be a thin mesh construction; they'll let sunlight through and will be almost invisible when viewed from a distance," Cash said. "We envisage a future where we could have a rectenna raised up a few meters above ground via poles, and repurpose the land underneath for, say, robotic farming or even human farming, as the land will be underneath a microwave shield, so there will be no exposure to microwave radiation."

Andrew Wilson is a research associate at the Advanced Space Concepts Lab at the University of Strathclyde, Scotland. His main research interest is in life cycle assessment, carbon accounting, cost analysis and energy systems, with particular focus on the space sector. 

In Airbus' idea of the future, solar power produced in space could contribute to cleaning up the hard-to-deal-with carbon footprint of aviation. Not that it would wean aircraft off fossil fuels entirely, but it could make a little dent in the amount of greenhouse gas the world's aircraft discharge into Earth's atmosphere.

"In the future, as we move toward hydrogen and battery-powered aircraft, we could use space-based solar power to extend the range of aircraft," Coste said. "We could use it in takeoff assist, because the takeoff is the moment where you use most of the fuel. You could have a beam that provides energy during takeoff and later to also recharge the aircraft as they fly."

The orbiting solar power plant will have to be enormous, and not just to collect enough sunlight to make itself worthwhile. The main driver for the enormous size is not the amount of power but the need to focus the microwaves that will carry the energy through Earth's atmosphere into a reasonably sized beam that could be received on the ground by a reasonably sized rectenna. These focusing antennas, Cash said, would have to be 1 mile (1.6 kilometers) or more wide, simply because of the "physics you are dealing with."

Compare this with the International Space Station, at 357 feet (108 meters) long the largest space structure constructed in orbit to date. Space based solar power proponents all agree that how exactly such plants could be put together is still a question. 

Cash says that his CASSIOPeiA concept would work also with multiple smaller plants in some types of lower Earth orbits. Having a plant closer to Earth would allow for the antenna to have a smaller size, possibly reducing the scale to one-tenth of what would be needed in geostationary orbit. On the other hand, a plant closer to Earth would be an easier target for anti-satellite missiles and might also annoy astronomers, as it would be too visible from the ground. 

In every case, building a space-based solar power plant would require hundreds of rocket launches (which would pollute the atmosphere depending on what type of rocket would be used), and advanced robotics systems capable of putting all the constituent modules together in space. 

This robotic construction is probably the biggest stumbling block to making this science fiction vision a reality, Cash said.

"If we can demonstrate that we can assemble smaller CASSIOPeiA satellites, 12 meters [40 feet] in diameter, using robots, then we can gradually expand to 100-meter [330 feet], 1 kilometer [0.6 miles] or 2 kilometer [1.2 miles] scales," Cash said. "We would just need to apply more robots working in parallel. But certainly, it's one of the key challenges."

Airbus, which recently conducted a small-scale demonstration converting electricity generated by photovoltaic panels into microwaves and beaming it wirelessly to a receiving station across a 118-foot (36 m) distance, says that one of the biggest obstacles for feasible space-based solar power is the efficiency of the conversion process. 

Microwaves slide through Earth's atmosphere almost undisturbed, losing barely 5% of their energy during their journey from geostationary orbit, according to Airbus' calculations. Huge amounts of energy, however, are lost already at the plant and then at the rectenna when the electricity produced by the photovoltaic panels is turned into microwaves and then back to electricity. 

"The system we used in our demonstration had end-to-end efficiency of about 5%," said Coste. "That's not something that would be operationally viable, even though the sunlight is free. For a space-based solar plant to make sense, the efficiency would have to be around at least 20%."

Jean-Dominique Coste is a senior manager at Airbus Blue Sky, a department of the European aerospace company that researches innovative concepts. Airbus Blue SKy focuses on breakthrough technologies with the potential to push boundaries and wide societal impact. 

Some worry that microwave beams in space could be turned into weapons of mass destruction and used by evil actors to fry humans on the ground with invisible radiation. 

Coste admitted that if someone wanted to develop such a weapon, they possibly could. The microwave beams carrying space-based solar power, however, would be engineered from the onset to be safe. 

How dangerous the beam is to human health, he said, depends on the density of the power it carries, and that could be limited by design.

"You could design the beam to be so safe that you could take a nap in it with your child and not be affected," said Coste. "That would be at a power density level of about 10 watts per square meter. But that will require an extremely large area to collect [the energy], so we would want to have a narrower beam with higher density and some safety system around it."

The company, he says, is looking into methods of "traffic management around the beam," using radars and lasers to look for objects in the beam's vicinity to stop the energy flow in case of a safety risk. 

"We can engineer a system that is designed to only be pointed at a receiver and would not ever work if it pointed anywhere else," said Coste. "We work on this concept with some big energy companies in Europe, and they don't see it as too much of an issue, as they are used to dealing with safety problems around high-voltage power lines or gas pipelines."

The vast orbiting structure of flat interweaving photovoltaic panels would be constantly battered by micrometeorites, running a risk of not only sustaining substantial damage during operations, but also of generating huge amounts of space debris in the process. 

The James Webb Space Telescope, with its 21.6-foot-wide (6.5 m) mirror, received quite a few significant hits early in its operations, prompting its ground control team to adjust observing plans to avoid gazing in the direction where most of the rocks come from. 

The engineers designing a possible future space-based solar power plant would certainly have to build their structure with this constant micrometeoroid influx in mind. 

"For the lifecycle of the station, you have to design it in a way that it can be maintained and repaired continuously," said Coste. "Because it's such a large structure, you will have some defects in some panels. The ideal design of the antenna will be modular so that you could replace tiles and panels."

Cash added that, by making the panels from the thinnest possible material, engineers can almost eliminate the generation of debris from the stricken panels. 

"If we make it from some type of polymer materials, then things like micrometeorites would just punch a hole straight through," Cash said. "We would hope that we can reduce the risk of generating debris but also the effects on the plant. If we build each of the modules to be independent of other modules, then all that happens is that a strike takes out a few elements."

But what about the end of life? What would happen with faulty modules that had to be replaced? And what about the whole thing once it reaches the end of its life, perhaps after a few decades of power generation? Will an object 1 mile (1.6 km) across be left in geostationary orbit to slowly decay? 

Wilson envisions a more sophisticated disposal procedure, which assumes that, by the time we may have space-based solar power plants, we are most likely going to see quite a bit of permanent infrastructure on the moon. Space tugs that don't exist yet could then move the aged plant to the moon, where its materials could be recycled and repurposed for another use. 

"One of the ideas for the future utilization of the moon is to use it for space launches into deeper space," said Wilson. "We could also have some kind of recycling center there to process some of the material."

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Some astronomers are concerned about the impact of such giant orbiting structures on the night sky. SpaceX's Starlink constellation has been provoking backlash from the astronomy community ever since the company's first satellite batches spread across the sky in the form of luminous trains. 

The International Astronomical Union decried Starlink as a worse threat to astronomy than urban light pollution, with large-scale survey telescopes scanning vast swaths of the sky especially affected. 

But Coste thinks that a plant in geostationary orbit, 22,000 miles away from Earth, would be barely noticable.

"From Earth, you would perceive it like a single star," he said. "The only part of the plant that will be facing Earth is the antenna, and that doesn't need to be light-reflecting. We could probably do something to the system to reduce the amount of light that is coming [to Earth]. I don't think it is as big a problem as the megaconstellations."

Cash agrees: "The whole concept [of a space-based solar power plant] is to gather and absorb as much sunlight as possible. We maintain this constant attitude, always sun-facing. And any parts which aren't absorbing that sunlight, we can arrange them in principle to deflect the sunlight away from Earth."

So what do you think? Should space-based solar power become a thing? Airbus appears serious about its plans, expecting to launch a small-scale demonstrator with an aerial platform in the next two years. A small-scale energy-beaming satellite might be in orbit by the end of this decade. 

"We see no showstopper," concluded Coste. 

Follow Tereza Pultarova on Twitter @TerezaPultarova. Follow us on Twitter @Spacedotcom and on Facebook. 

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: community@space.com.

Solar Panel Inverter Tereza is a London-based science and technology journalist, aspiring fiction writer and amateur gymnast. Originally from Prague, the Czech Republic, she spent the first seven years of her career working as a reporter, script-writer and presenter for various TV programmes of the Czech Public Service Television. She later took a career break to pursue further education and added a Master's in Science from the International Space University, France, to her Bachelor's in Journalism and Master's in Cultural Anthropology from Prague's Charles University. She worked as a reporter at the Engineering and Technology magazine, freelanced for a range of publications including Live Science, Space.com, Professional Engineering, Via Satellite and Space News and served as a maternity cover science editor at the European Space Agency.<\/p>"}; /*! 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