What is the power output of JWST's solar panels in kilowatts?

What is the power output of JWST’s solar panels in kilowatts? The answer is 2 kilowatts. That electrical power runs the telescope’s computers, instruments, communications equipment, heaters, and control systems.

Unlike a telescope in low Earth orbit, JWST operates near the Sun–Earth L2 point, about 1.5 million kilometres from Earth. Its solar array remains on the warm, Sun-facing side of the spacecraft, where it can receive continuous sunlight while the telescope and instruments stay behind the giant five-layer sunshield.

Webb’s solar array is a single deployable wing divided into five panels. It unfolded shortly after launch on December 25, 2021, during the observatory’s complicated deployment sequence. Rechargeable batteries provide energy when needed, while the electrical power system regulates and distributes the array’s output.

The 2-kilowatt figure is the telescope’s listed power capability, not the amount used by a household-style appliance or the energy produced by a vast field of panels. Webb’s instruments are carefully designed for low-power operation because every watt contributes to the mission’s ability to observe faint infrared light while maintaining a stable, extremely cold environment.