Move the Power Station Into Orbit — Can It Cut Electricity Prices by an Order of Magnitude?
Space-based solar isn't science fiction: the same photovoltaic panel generates 8 to 13 times more power in orbit than on the ground. The real bottleneck isn't physics — it's regulation and public trust.
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The argument · tap a timestamp to hear it
Intermittency is the real culprit behind expensive electricity
The UK has moved most aggressively on wind, solar and batteries, and the result has been higher energy costs for households and businesses. Martin's mechanism: intermittent sources push up system costs — you have to use gas or coal as backup generation to balance, and you have to overbuild wind and solar. So ‘the sun is free, the wind is free’ doesn't hold at all at the system-cost level; it's actually very expensive. From this he draws the conclusion: what's needed is firm power — 24-hour, all-weather, dispatchable, reliable power, not just low-carbon power.
— Martin SoltauSpace solar's superpower is a beam you can switch
Martin breaks space solar's characteristics into several parts: low-carbon, 24-hour all-weather firm power, and dispatchable (able to modulate power and interoperate with other sources to balance the grid). The last one, he thinks, is the most underrated: energy is beamed from space to Earth, and the beam can be switched instantly to wherever power is needed. In other words, it is essentially an ‘extremely flexible global interconnector’ that could replace the fixed subsea interconnector cables between the continent and the UK — and those cables are already being targeted for attack.
— Martin SoltauCut ground solar's weight a hundredfold, then send it up
The same photovoltaic panel placed in space generates 8 to 13 times more power than in the sunniest place on the ground, because there's no night, no weather, no atmospheric attenuation, and utilisation is close to 100%. Space Solar's approach is to cut ground solar technology's weight by 100 times and then send it up, because even with falling launch costs, launch is still the bulk of capex. A by-product is not needing the critical minerals that batteries and motors require — wind turbines use large amounts of critical minerals, whose extraction and refining have a huge environmental impact. The whole satellite is assembled from hundreds of thousands of ‘Lego-brick’-style modules, with no single point of failure, and unit costs are driven down by mass production.
— Martin SoltauLaunch isn't the risk — the timetable is
Asked whether launch is the hardest part, Martin's answer is ‘the timing is right now’: large reusable launch systems like SpaceX Starship and Blue Origin New Glenn have entered advanced flight testing, and reusability plus rapid turnaround can cut launch costs by 100 times. He offers an analogy: if you threw away a commercial airliner after every flight, flying would be absurdly expensive. The key judgment is that these systems will be operational within two or three years, while Space Solar actually won't need them for six or seven years, so capacity and cost are ‘not a risk at all’. The real risk is that regulation is established too slowly — a timescale risk.
— Martin SoltauThe standards fight is the real geopolitical battlefield
Martin argues there is precedent for countries collaborating for mutual benefit: the semiconductor industry's steady performance gains, doubling every 18 months, didn't happen by accident — it came out of international committees sitting down to talk; USB storage is also an international standard. Space solar counts as critical national infrastructure, so it is highly strategic, and there will be a race ‘to be first and to set the standards’. Space Solar is currently working closely with the International Telecommunication Union on spectrum — power transmission requires spectrum. His judgment is that the main risk is nothing else but that this happens more slowly than hoped.
— Martin SoltauRobots crawl along the structure to clip modules together
In the Harwell lab, Space Solar is working on two key technology demonstrations that underpin every solar satellite design: lightweight, high-performance, high-efficiency power transmission, and in-orbit assembly. The modules are coffee-table sized, and after riding the rocket up they are clipped together by robots that live on the structure and crawl along it; the detailed design is already complete. Power transmission itself is not new: back in the 1970s NASA modified a Deep Space Network antenna and transmitted about 34 kilowatts at the required efficiency over a distance of about 1.6 kilometres. Martin says he can write the physics on a small whiteboard; the hard part is engineering and economics — cutting weight 100 times and maintaining transmission efficiency in a flexible structure in space.
— Martin SoltauA fusion expert jumped ship because fusion can't scale
Space Solar's CTO Dave Humphrey is a world-class fusion authority, and he moved from fusion to space solar because he couldn't see how fusion scales or how it gets the right unit economics — even if it overcomes all its physics and materials challenges. Martin uses this contrast to position the difficulty: space solar doesn't have those problems, the physics is known, and what remains is engineering, economics, weight reduction and in-orbit assembly. The timetable is a large low-Earth-orbit pilot power station within five years, then several more years to build and commission the first large-scale commercial systems.
— Martin SoltauThe tech can be demonstrated, but it won't happen if the public won't buy it
Martin himself singles out the word ‘trust’: no new technology is a done deal until it has been demonstrated and accepted by the public. He cites UK fracking as an example — the technology was mature, but public acceptance was an extremely important part. Space solar can demonstrate power transmission today and can make the economics add up, but if the public doesn't trust it, it won't happen. He acknowledges this will become more relevant once a test system actually goes up, because then people can see ‘this isn't science fiction anymore’. His safety argument: it uses low-intensity radio frequency in the same bands as Wi-Fi and microwave ovens, the intensity is measurable, and there are well-established safety guidelines.
— Martin SoltauIn their own words · checked verbatim
And that's because intermittency drives high system costs. You need to balance intermittent sources of supply with backup generation, be it gas or coal or other forms. You need to overbuild the wind and solar.
Martin Soltau4:10
if you put a solar panel into space, you can generate between eight and 13 times more energy than that same panel on the Earth, even in the sunniest place.
Martin Soltau7:20
if we threw away our commercial aircraft every time we flew, then flying would be insanely expensive.
Martin Soltau10:33
That wasn't just sort of didn't just happen by chance. That was international committees coming together and working out how that was going to happen.
Martin Soltau19:23
he left fusion to come to space-based solar power because he could never see really how fusion will, even if it overcomes all of the physics and materials challenges, it could never see how it could scale up or have the sort of right unit economics.
Martin Soltau25:31
With any new technology, it's not a given until it's demonstrated. And also, it has that public buy-in.
Martin Soltau26:37
We all use Wi-Fi and microwave ovens. This is exactly the same. You know, it's at that same frequency. It's low intensity radio frequency.
Martin Soltau29:41
Figures
| Power output multiple of a space solar panel versus the same panel on the ground | 8 to 13 times | 7:20 |
| Weight reduction factor needed to send ground solar technology to space | 100 times | 8:24 |
| Cost reduction from reusable launch | 100 times | 10:33 |
| Distance of NASA's power transmission experiment | about 1.6 kilometres | 24:29 |
| Semiconductor performance doubling period | every 18 months | 19:23 |
| Timetable for a large low-Earth-orbit pilot power station | within five years | 20:23 |
| Timetable for Space Solar's first large-scale commercial systems | a few years after the pilot | 25:31 |
Glossary
- firm power
- Electricity that is available 24 hours a day, all-weather, independent of weather, and can be output steadily.
- rectenna
- A sparse ground structure that receives space microwaves and converts them into electricity; it takes up a lot of land but has low impact.
- power beaming
- Wirelessly transmitting energy from orbit to a ground receiving station using microwaves.
- intermittency
- Wind and solar output fluctuates with the weather, requiring backup generation and overbuilding to balance.
How to listen
Founders and investors watching the energy transition, grid system costs and deep-tech investment — especially anyone trying to understand why wind and solar are cheap but electricity is expensive.
The first two minutes of host introduction and small talk can be skipped.