Deep Space Energy is a Latvian deep-tech startup founded in 2022 as a spin-off from the Institute of Physics at the University of Latvia. The company develops radioisotope power systems (RPS) that convert the heat of nuclear decay into electricity using its proprietary Radioisotope Thermo-Acoustic Linear Induction Generator (RTALIG), achieving approximately 25% efficiency — five times better fuel economy than legacy radioisotope thermoelectric generators (RTGs). Its modular 50 W design requires only ~2 kg of Americium-241 to match output that would require ~10 kg for a conventional RTG, and features a single-piston architecture that reduces mechanical failure points for decade-plus reliability.

The company's dual-use technology targets resilient backup power for high-value defense and reconnaissance satellites (protecting against eclipse, laser-induced power loss, and line-of-sight blackouts), as well as long-duration surface missions on the Moon and Mars where solar power is unavailable. Longer-term use cases include deep-space science probes, permanently shadowed lunar polar craters, subsea drones, and forward ISR posts. Deep Space Energy offers power under a "Power-as-a-Service" model, retaining and redeploying regulated radioisotope heat sources after mission completion.

The company operates two hubs — Deep Space Energy, SIA in Riga, Latvia, and Deep Space Energy Ltd. in Coventry, United Kingdom — combining Baltic hardware talent with UK electromagnetics research depth. It is backed by ESA technology development contracts, NATO DIANA (the first Latvian company selected), Latvian government grants, and private venture capital. The company completed TRL3 proof-of-concept validation of the RTALIG in 2025 and won the TechChill 2026 Founders Battle in Riga.