When Hydrosat raised its Series A in 2023, it presented itself as a climate company. Co-founder and CEO Pieter Fossel said at the time that “climate change is humanity’s most pressing issue,” and the pitch was about water stress and crop yields.
Three years later, the same company is building a European program called Nyktòs to supply NATO and allied governments with high-resolution thermal imagery for tactical intelligence, surveillance and reconnaissance, taskable by day or night.
The program, announced on November 2, comes with new facilities in Europe and a regional supply chain built around sovereign defense customers.
Hydrosat still sells to farmers and water managers, but what has grown is the range of customers paying for data its sensors were already capable of collecting; a satellite that can read the temperature of a field can also read the temperature of a parked truck.
As European governments have increased spending on their own space intelligence, that overlap has become a growing part of the business.
Other European thermal imaging startups have followed a similar arc. Their experience is useful for any deep tech founder whose technology could serve more than one market.
Same heat signature, different customer
Thermal imaging was always technically dual-use—even when the marketing wasn’t. Defense customers have used Hydrosat’s existing satellites for night-time surveillance; thermal sensors work just as well in the dark, so they can pick up troop movements and power use.
The data that tells a farmer when to irrigate can also tell an analyst when a facility has started operating. The skill lies in knowing where to look, and how closely. “Finding and understanding activity on the ground requires both monitoring of wider areas and the ability to examine specific locations in detail,” said Scott Soenen, Hydrosat’s CTO.
Hydrosat has kept a sizable commercial base alongside its defense work. Fossel told Payload that about 40% of the company’s revenue is purely commercial, and that he expects the mix to change.
That commercial base gives a company steady customers while it works through defense procurement cycles, which can take years, and it can also show government buyers that the product already works outside a lab.
Munich-based constellr followed a similar path. It didn’t start in defense tech, but its co-founder told Resilience Media that its pipeline “has exploded” since it began targeting the military.
For founders in climate, agriculture or infrastructure monitoring, these cases raise a practical question about which public agencies might pay for the same data, and what those agencies would need before signing a contract.
Products that create demand for each other
The most interesting part of the Nyktòs announcement is how the products fit together. Hydrosat’s upcoming Osiris constellation is designed to monitor very large areas, with 25-meter thermal imagery across a swath of 160 to 340 kilometers. Nyktòs adds the opposite capability, which is high-resolution imaging of specific sites on request. The broad system flags something unusual, and the detailed system is pointed at it.
“Broad-area thermal monitoring provides the context to identify changes, while high-resolution MWIR allows us to investigate those changes more closely,” Soenen added.
This structure applies well outside the space industry. A low-cost, always-on product that watches everything produces questions, and a premium product answers them; every alert from the first product is a possible sale for the second.
Software companies use the same logic when free monitoring dashboards lead customers into paid investigation tools, for example. Designing a product line this way means each tier creates demand for the next, instead of competing with it for the same budget.
Where you build becomes part of what you sell
For defense buyers, particularly in Europe, the location of a supplier’s engineers, factories and data processing increasingly affects which contracts it can compete for.
Hydrosat is headquartered in Washington and Luxembourg. The company says its new European facilities and supply chain will support technology development, spacecraft integration, mission operations, data processing and analytics in the region. It also says governments want control over tasking, protection for sensitive data and access that holds up during a crisis.
“Europe’s investment in space is an investment in its ability to protect its interests and make independent decisions. We are committed to helping turn that ambition into capability,” Fossel said.
“By expanding our presence and investing in technology development here in Europe, we are strengthening the industrial foundation for sovereign space missions, and for Europe to act with confidence alongside its allies.”
EU governments have committed to a joint space defense project with indicative spending of €24 billion by 2034. Meanwhile, venture investors are following the money. Dealroom forecasts that European defense startups will raise a record $10.5 billion this year, about four times the 2025 total.
U.S. investors now supply 47% of European defense tech funding, leaving founders in this market potentially raising from American funds while selling to European buyers who prioritize sovereignty.
The tradeoffs that come with government customers
Selling to defense changes a company in ways that are easy to underestimate. TechRound noted that British thermal imaging company SatVu does not disclose its buyers or contract values, for one, which is common in military markets where government customers prefer discretion.
That affects how a startup tells its story to investors, how it recruits engineers who joined for a climate mission, and how it responds to public questions about surveillance.
Hydrosat’s sovereign mission model separates the two customer groups at the design level: a government can run a dedicated mission with its own rules for tasking, control, security and data access, and draw on the commercial fleet for extra coverage when needed.
For founders considering a similar move, the policy decisions behind that kind of separation usually take longer than the engineering. They include which customer sees which data, who can request imagery, and what the commercial side is told about the defense side.
A dual-use startup can build its sensors, satellites and software once and sell them to very different buyers, but trust has to be earned separately with each one. A defense ministry buying sovereign intelligence and a farmer buying irrigation data are both paying, in part, for certainty about who else can see what they see.
Founders who set those rules early, before the first defense contract forces the question, give themselves a far stronger hand when that contract arrives.
Featured image: Allison Saeng via Unsplash+
