India's space scientists have developed electric propulsion technology that is expected to boost the life of geostationary satellites by up to five years. <br/><br/>ISRO chairman Madhavan Nair said that the system would be tested in GSAT-4 spacecraft slated to be launched on board GSLV later this year. Mr Nair said that so far, ISRO had been using chemical propulsion for station-keeping, altitude control, precision spacecraft control, stabilisation and orientation. He added, with the use of electric propulsion, the life of the spacecraft can be enhanced.