The Technology Experiment Satellite (TES), weighing 1108 kg, was launched on October 22, 2001. TES is an experimental satellite to demonstrate and validate the technologies like attitude and orbit control system, high-torque reaction wheels, new reaction control system, light-weight spacecraft structure, solid state recorder, X-band phased array antenna, improved satellite positioning system, miniaturised TTC and power systems and, two-mirror-on-axis camera optics.

TES also carried a panchromatic camera for remote sensing experiments.