A geostationary satellite completes on round in?

The useful lifetime of a geostationary satellite is determined by the maximum acceptable deviation in inclination and orbital location together with reliability of the satellite's critical subsystems. A satellite is maintained in its orbital location by firing thrusters regularly, using stored fuel. Hence it is possible to increase the operational lifetime of a satellite by the following means.

a - Increasing the fuel capacity.
b - Saving fuel by accepting orbital deviation to the maximum extent possible.

Both these techniques are used when applicable. A more efficient alternative is to improve the efficiency of the fuel used for propulsion useful satellite lifetimes have increased from 7-10 years 1980s to 12-15 years 1990s as a direct result of improved fuel efficiency as well as improvement in reliability of critical hardware such as the high power amplifier. The life of the satellite also depends on the quality of batteries used on board the satellite and the amount of power drain.