What is the power consumption of Hubble in watts?

Hubble’s listed power consumption is approximately 2,800 watts. That electricity runs its scientific instruments, computers, heaters, transmitters, guidance systems, and other spacecraft equipment.

Hubble generates power with two solar arrays made from gallium-arsenide cells. The arrays produce roughly 5,000 watts under suitable conditions, with excess energy stored in six nickel-hydrogen batteries. When Hubble passes through Earth’s shadow, the batteries supply electricity until sunlight returns. NASA describes the spacecraft’s typical modern operating demand as about 2,100 watts, so the 2,800-watt figure is best understood as the commonly listed spacecraft power requirement or design figure rather than a constant reading in every operating state.

This distinction explains why different references may show slightly different numbers. Power use varies with the instruments operating, spacecraft mode, battery charging, and mission configuration. The 2,800-watt answer remains the standard single-value specification used in Hubble reference data.