Strategic
Distributed sensing and AI inference are moving power demand to the tactical edge. Forces that can operate longer without resupply retain initiative; passive generation reduces exposure of fuel convoys and generator maintenance teams.
UTS IP · research translation
Turn the cold sky into silent, fuel‑independent electricity at the edge.
Noctis Power is developing solid‑state power generation that couples thermoelectric modules to a radiative cold side: heat is rejected upward through the atmospheric infrared window to deep space, establishing a usable ΔT without combustion (Raman et al., 2014; Zhao et al., 2019). The strategic bet is simple — the world is adding sensors, radios, and AI at the network edge faster than we can sustain them with diesel runs and battery swaps. A passive harvester that works while the sky is clear addresses a growing logistics and signature problem, not a niche curiosity.
This is not a replacement for every generator; it is a new layer in the power stack for missions where silence, endurance, and supply‑chain independence matter — exactly where peer‑reviewed radiative‑cooling science has advanced fastest over the last decade (Ishii et al., 2020).
- Fuel independence
- Passive thermal path to electricity — fewer convoys, fewer tank fills, fewer moving parts.
- Signature & survivability
- No engine noise or exhaust plume; reduced thermal and acoustic contrast versus gensets.
- Science + IP
- Grounded in published radiative‑cooling physics; R&D and IP with University of Technology Sydney.
Illustrative
Off‑grid
Unattended
Edge systems
Quantitative performance (power density, ΔT, TRL) on this site are placeholders pending peer‑reviewed validation of the specific hardware under stated environmental conditions.
Perspective
Why this direction — and why now
Every major power transition of the last century added a new primary energy source alongside the old one. The edge of the network — defence outposts, unattended sensors, disaster zones, and remote industrial nodes — is still dominated by batteries plus occasional diesel. That model is reaching its logistical ceiling: fuel price volatility, contested supply lines, and the sheer count of devices to be sustained all push toward diversified, distributed harvesters that do not depend on a fuel truck schedule (see macro context in IEA, 2023).
Radiative sky cooling is not speculative fiction: peer‑reviewed work has demonstrated sub‑ambient passive cooling under sunlight (Raman et al., 2014), surveyed the materials landscape (Zhao et al., 2019), and shown continuous thermoelectric voltage when a selective emitter maintains a cold junction (Ishii et al., 2020). The open engineering questions — packaging, ΔT under real weather, power density per kilogram — are exactly the problems a focused defence‑oriented programme is positioned to solve with partners.
The pitch: secure a stake in the next layer of distributed edge power by pairing defensible university IP with integrators whose missions require silent, persistent electricity and measurable logistics savings. The offer is operational resilience — articulated in ΔT, output power, and availability under stated conditions, not in generic sustainability narratives alone.
Technical
The thermodynamic resource — a cold sky — is available globally; the engineering task is to convert that gradient into reliable electrical output in deployable form factors, with honest accounting for weather, emissivity, and thermal resistance.
Commercial
Dual‑use markets (remote infrastructure, environmental monitoring, emergency comms) can parallel defence trials, de‑risking manufacturing scale while mission users supply the toughest performance requirements.
01 · Core
How the technology works
Radiative sky cooling uses the atmospheric infrared window (roughly 8–13 µm) to reject heat to the cold upper atmosphere and deep space, enabling net cooling of a surface relative to ambient under suitable conditions (Raman et al., 2014). Zhao et al. (2019) provide the canonical review of materials, systems, and application classes.
In our architecture, a thermoelectric generator sits between a controlled hot side and a radiatively cooled cold side. When that ΔT is stable, the module delivers usable electricity — work in Ishii et al. (2020) demonstrates the day/night continuity principle using wavelength‑selective emission. What remains for productisation is mission‑specific packaging, thermal‑hydraulic design, and validation under your environmental envelope — not hand‑waving about “free energy,” but disciplined engineering against measured ΔT and load curves.
Signature advantage
Eliminating combustion removes a dominant acoustic source and the hot exhaust plume that advertises a site to IR sensors. Trade‑offs are managed through aperture, insulation, and thermal mass — standard systems engineering, applied to a novel cold source.
Persistence path
Where solar is intermittent and batteries cycle, a passive thermal gradient can, in principle, contribute baseline watts across diurnal cycles when sky conditions permit — complementary to storage, not a wholesale substitute for every mission profile.
Integration
Modules can be staged as tiles for scaling power and redundancy; interfaces target standard DC buses for radios, sensors, and compute — meeting integrators where their architectures already live.
Visual overview
System infographic
Diagram of the passive thermal stack, sky coupling, and electrical output. Opens in Google Gemini (new tab; sign‑in may be required).
Open infographic
Tip: export the image from Gemini as PNG and we can embed it directly on this page for viewers without a Google login.
We sell evidence, not hype
Roadmaps lead with instrumented prototypes, documented sky and weather conditions, and partner‑witnessed test campaigns. Numbers on this site are placeholders until they carry a test report behind them — that is how you win serious programmes.
02 · Missions
Where silent watts win programmes
Defence and national‑security buyers do not purchase “cool technology” — they purchase persistent effects per kilogram of logistics. The application set below is illustrative: each implies long dwell times, low acoustic and thermal signature, and a strong preference to avoid generator noise and fuel handling near the sensor head. Final requirements, interfaces, and qualification paths are established with your programme office — this is a conversation starter, not a datasheet.
ISR & perimeter sensing
- Long‑endurance electro‑optical / IR towers and unattended ground sensors
- Coastal and border monitoring where battery swaps are costly or politically visible
- Instrumentation ranges where power noise corrupts measurements
Comms, gateways, edge compute
- Forward relays and mesh backhaul nodes that must stay up between logistics rotations
- Temporary command posts where generator signature is unacceptable
- Low‑power edge AI preprocessing for tipping and cueing — every watt budget matters
Power / ΔT
To be reported from calibrated tests (W, W/m², junction ΔT).
Mass / volume
To be reported against stated packaging and integration assumptions.
Environment
Ambient range, sky view factor, wind, and cloud statistics to be documented.
03 · Ecosystem
Partnering
Translation from laboratory physics to fielded hardware requires rigour + route to market. Research and development is conducted with the University of Technology Sydney (UTS), which holds the underlying intellectual property. We are in active discussion with global primes and integrators to co‑define trials, interface standards, and scaling pathways — the organisations listed under “target integrators” are outreach targets, not implied contractual relationships.
Research partner
Research & development · IP owner
Target integrators (in discussion)
BAE Systems
Outreach
Thales
Outreach
Lockheed Martin
Outreach
Other primes & integrators
Outreach
Architecture fit
Joint definition of electrical, mechanical, and thermal interfaces so the power module drops into your sensor and comms line replaceables rather than inventing a new ecosystem.
Trials & evidence
Structured field evaluations with agreed metrics — output power, availability window, logistics burden — feeding both internal design locks and external programme milestones.
Industrial scale
Pathways from prototype batches to qualified suppliers, aligned with defence‑grade quality systems and export considerations for your markets.
04 · Literature
Selected references
The following peer‑reviewed articles and institutional report establish the physical basis for radiative sky cooling, review the field, and report experimental work on radiative cooling coupled to thermoelectric devices. Inclusion here does not imply endorsement of this product by the authors or publishers.
- Raman, A. P., Anoma, M. A., Zhu, L., Rephaeli, E., & Fan, S. (2014). Passive radiative cooling below ambient air temperature under direct sunlight. Nature, 515(7528), 540–544. https://doi.org/10.1038/nature13883
- Zhao, D., Aili, A., Zhai, Y., Xu, S., Tan, G., Yin, X., & Yang, R. (2019). Radiative sky cooling: Fundamental principles, materials, and applications. Applied Physics Reviews, 6(2), 021306. https://doi.org/10.1063/1.5087281
- Ishii, S., Dao, T. D., & Nagao, T. (2020). Radiative cooling for continuous thermoelectric power generation in day and night. Applied Physics Letters, 117(1), 013901. https://doi.org/10.1063/5.0010190
- International Energy Agency. (2023). World Energy Outlook 2023. IEA Publications. Context on fuel supply uncertainty and long‑term energy‑system transitions relevant to logistics‑intensive applications. https://www.iea.org/reports/world-energy-outlook-2023
UTS retains intellectual property for the underlying technology; this page summarises public literature for scientific context only. Performance claims require data sheets and test protocols specific to the hardware under offer.
05 · Contact
Start the conversation
If you are responsible for power architecture, trials, or portfolio investment, send a short brief: required electrical load, duty cycle, deployment geography, and signature constraints. We reply with a proposed technical engagement — measurement plan, milestones, and clarity on what is proven in literature versus what remains to be demonstrated on hardware.
Scholarly integrity
Public literature citations on this site support physical principles only. Programme‑specific performance
and UTS disclosures are shared under appropriate agreements.