NASA’s Lithium Plasma Thruster Reaches 120 kW, a Step Toward Human Mars Flights

*TL;DR NASA’s lithium plasma thruster hit a record 120 kW, proving the high‑power electric propulsion needed for future crewed trips to Mars.*

Context On Feb. 24, 2026, engineers at NASA’s Jet Propulsion Laboratory (JPL) fired a lithium‑fed magnetoplasmadynamic (MPD) thruster inside a water‑cooled vacuum chamber. The test aimed to push electric propulsion beyond the limits of current spacecraft, which rely on lower‑power ion engines.

Key Facts - The thruster operated at 120 kW, more than 25 times the power of the electric thrusters on NASA’s Psyche mission. - During five ignition cycles the central tungsten electrode glowed white, reaching temperatures above 5,000 °F (2,800 °C). - NASA Administrator Jared Isaacman called the test “real progress toward sending an American astronaut to set foot on the Red Planet” and noted it is the first U.S. electric propulsion system to reach this power level. - Senior JPL scientist James Polk said the test hit target power and demonstrated a reliable testbed for scaling the technology.

What It Means Electric propulsion uses electrical energy to ionize a propellant—in this case lithium metal vapor—and then accelerates the resulting plasma with strong magnetic fields. Compared with chemical rockets, it consumes up to 90 % less propellant, but delivers thrust continuously rather than in short bursts. The record 120 kW shows the MPD design can generate far more thrust than existing solar‑electric engines, a prerequisite for moving large payloads on interplanetary trajectories.

For a crewed Mars mission, NASA estimates a total power budget of 2–4 MW, likely spread across multiple thrusters operating for more than 23,000 hours. The next development step is to raise individual thruster output to 500 kW–1 MW and prove long‑duration reliability under extreme heat. Success would enable faster transit times, reduced launch mass, and greater mission flexibility for both crewed and robotic explorers.

Looking Ahead Future tests will focus on scaling power, extending burn time, and integrating the thrusters with spacecraft power systems. Monitoring those milestones will indicate how soon NASA can move from laboratory proof‑of‑concept to a flight‑ready propulsion module for a Mars crew launch.