Satellites Powered by Water? The Revolutionary Propellant Changing Spaceflight
Momentus Space’s Vigoride-5 raised its orbit by 3 km in January 2023 using a microwave electrothermal thruster powered by water. HawkEye 360 and Capella Space began commercial use of water thrusters in 2018, with BlackSky Gen-2 joining by 2024. ArianeGroup plans a dual-mode water engine demo in 2026. Pale Blue’s water ion thrusters launched in 2024, with further tests set for 2025.