# Is Air-Breathing Electric Propulsion the Key to Unlocking Very Low Earth Orbit?

Spanish startup Kreios Space is preparing to fly the world's first satellite powered by air-breathing [electric propulsion](https://orbital-intel.com/glossary/electric-propulsion) (ABEP) — a thruster that scoops residual atmospheric molecules, ionizes them, and expels them to generate thrust without carrying any conventional propellant. The company announced on August 4, 2026 that it has selected Lithuanian satellite manufacturer Kongsberg NanoAvionics to supply the [satellite bus](https://orbital-intel.com/glossary/bus) — specifically the MP42 platform — for the demonstration mission. Kreios Space's own website lists 2027 as a notional target for its first flight, though the company stopped short of committing to a firm launch date in its announcement.

The target operating regime is very low Earth orbit (VLEO), defined by the source as roughly 100 to 400 kilometers altitude — below the band where most commercial [LEO](https://orbital-intel.com/glossary/leo) constellations park their satellites. At those altitudes, atmospheric drag is continuous and severe enough that a satellite without persistent propulsion will deorbit in days or weeks. ABEP addresses that problem directly: instead of fighting drag with a finite propellant supply, the thruster harvests the very atmosphere causing the drag to generate counteracting thrust.

If the demonstration succeeds, it would validate a propulsion architecture that has been theorized for decades but never flown.

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## What ABEP Actually Does — and Why VLEO Is Attractive

The physics of ABEP are straightforward in concept and notoriously difficult in execution. Atmospheric molecules at VLEO altitudes — predominantly atomic oxygen — are ingested through an intake, heated, ionized into a plasma, and accelerated electrostatically or electromagnetically out the nozzle to generate thrust. The propellant mass flow is effectively zero from the spacecraft's perspective; the "fuel" is the ambient environment.

This matters because the alternative — carrying enough conventional propellant to overcome continuous drag at sub-250 km altitudes — is mass-prohibitive for most mission architectures. Satellites in standard LEO, operating between roughly 160 and 2,000 km, experience drag that is manageable with periodic boost burns. VLEO is a different regime entirely: propulsion must run continuously or near-continuously, which drains any onboard propellant supply rapidly.

The payoff is significant. Earth observation satellites operating closer to the surface produce sharper imagery due to the shorter slant range. Communications satellites at lower altitudes deliver reduced signal latency. And as Kreios Space CEO Adrián Senar noted in the August 4 statement, VLEO offers a substantially less congested operating environment than LEO, where [SpaceX](https://orbital-intel.com/companies/spacex)'s Starlink [megaconstellation](https://orbital-intel.com/glossary/megaconstellation) and other operators have placed thousands of spacecraft.

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## The MP42 Bus and What Kongsberg NanoAvionics Brings

Kongsberg NanoAvionics, headquartered in Lithuania, is providing its MP42 satellite bus — a medium-class nanosatellite platform — configured specifically to host Kreios Space's ABEP hardware. Kongsberg NanoAvionics CEO Atle Wøllo described the mission as joining "a very short list of European VLEO initiatives," which is an accurate characterization: operational VLEO missions remain essentially nonexistent, and European-led efforts in this altitude band are sparse.

The engineering challenge here extends beyond the propulsion system itself. The satellite bus must tolerate the atomic oxygen environment at VLEO altitudes, which is highly corrosive to standard spacecraft materials and solar cell surfaces. Thermal management is also complicated by the denser atmospheric interaction. The fact that Kongsberg NanoAvionics worked closely with Kreios to configure the MP42 for these specific constraints suggests meaningful co-engineering rather than a simple off-the-shelf integration — though neither company has published detailed technical specifications in this announcement.

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## Skeptical Assessment: What the Announcement Doesn't Tell Us

Several critical data points are absent from Kreios Space's announcement, and that absence warrants attention before drawing conclusions about commercial viability.

**Thrust levels and Isp are unspecified.** ABEP systems face a fundamental challenge: the atmospheric density at VLEO varies by more than an order of magnitude depending on solar activity and precise altitude. Generating net positive thrust — where propulsive force exceeds the drag load — across that range is the central engineering problem. No thrust figures or specific impulse values were disclosed.

**No firm launch date.** The company's language — launching "at a time when interest in and development of VLEO technologies has accelerated" — is hedged enough to be meaningless as a timeline commitment. The 2027 target on the company website is described as "notional."

**No funding figures disclosed.** The announcement names a hardware partner but does not indicate the capital structure behind this mission or whether Kreios Space has secured launch contracts.

**Single-orbit demonstration versus sustained operations.** Demonstrating that ABEP generates any thrust in VLEO is a lower bar than demonstrating it can sustain a satellite at constant altitude through a solar maximum, when atmospheric density at these altitudes increases substantially due to heating from elevated solar activity.

These gaps are normal for a pre-flight technology demonstration announcement. But buyers evaluating VLEO Earth observation contracts or defense imagery applications should treat this as a technology readiness level (TRL) advancement story, not a near-term commercial service announcement.

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## Broader Industry Implications

VLEO has attracted attention from multiple directions simultaneously. Earth observation companies — including players like [Albedo](https://orbital-intel.com/companies/albedo), which targets very low altitudes specifically for higher-resolution optical imagery — are probing the commercial case for sub-300 km operations. Defense customers have long recognized that closer-to-Earth satellites provide tactical imagery advantages. And the congestion dynamic in standard LEO is a genuine pressure pushing operators to consider alternative altitude bands.

ABEP is not the only approach under development for VLEO drag compensation. Resistojet and gridded ion thruster designs using stored xenon or iodine propellant have been proposed and partially demonstrated. The ABEP advantage — eliminating propellant mass entirely — would be decisive for long-duration missions if the technology reaches operational Isp and thrust levels sufficient for sustained station-keeping. A successful Kreios Space demonstration would meaningfully advance the TRL for ABEP globally, since no ABEP system has flown in orbit anywhere.

For the European space industry specifically, a successful VLEO demonstration would establish Kreios Space and Kongsberg NanoAvionics as early movers in a niche that larger primes have largely ignored. Whether that translates to commercial contracts depends entirely on what the flight data shows.

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## Key Takeaways

- **Kreios Space** (Spain) has contracted **Kongsberg NanoAvionics** (Lithuania) to supply the **MP42 satellite bus** for the world's first orbital test of air-breathing electric propulsion (ABEP).
- ABEP ingests, ionizes, and expels atmospheric molecules as propellant, eliminating the need for onboard propellant in the VLEO altitude band (roughly 100–400 km).
- The company's website targets **2027** for its first space mission, but no firm launch date was announced on August 4.
- VLEO offers lower congestion than standard LEO and sharper Earth observation imagery, but continuous drag compensation is required — the core problem ABEP is designed to solve.
- No thrust figures, Isp values, or funding details were disclosed; this remains a pre-flight technology demonstration with significant engineering milestones still ahead.
- A successful flight would mark the **first orbital validation of ABEP anywhere in the world** and position European startups as early leaders in a nascent altitude band.

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## Frequently Asked Questions

**What is air-breathing electric propulsion (ABEP)?**
ABEP is a propulsion technology that collects residual atmospheric molecules at very low Earth orbit altitudes, ionizes them into a plasma, and accelerates them electrostatically or electromagnetically to generate thrust — effectively using the surrounding atmosphere as propellant rather than carrying fuel onboard.

**What altitude is very low Earth orbit (VLEO)?**
According to Kreios Space's announcement, VLEO spans roughly 100 to 400 kilometers above Earth's surface. This is below the operational altitude of most commercial satellite constellations and low enough that continuous atmospheric drag requires persistent propulsion to maintain orbit.

**Who is building the Kreios Space ABEP demonstration satellite?**
Kreios Space is developing the ABEP propulsion system. Lithuanian company Kongsberg NanoAvionics is supplying the MP42 satellite bus that will host the ABEP hardware for the orbital demonstration.

**When will the Kreios Space ABEP satellite launch?**
No firm launch date has been announced. The company's website lists 2027 as a notional target for its first space mission.

**Why does VLEO matter for Earth observation?**
Satellites operating at lower altitudes have a shorter slant range to the surface, which enables higher-resolution imagery for the same sensor aperture. VLEO also remains far less congested than standard LEO, where thousands of satellites — the majority from SpaceX's Starlink constellation — are currently operating.

**Has ABEP ever been tested in orbit before?**
No. If Kreios Space's mission flies as planned, it would be the world's first orbital demonstration of air-breathing electric propulsion, according to the company's August 4, 2026 announcement.