BulgariaSat-1 is based on an intermediate-power variant of the SSL 1300 satellite bus with a 15+ year design life.[2] Coupled with the boost provided by its Falcon 9 launch vehicle, it carries enough fuel for more than 18 years of service.[2] Power is supplied by two three-panel solar arrays delivering 10 kilowatts, while propulsion is provided by an R-4D-11 hypergolic rocket engine supplemented by an array of attitude control thrusters.[2] The spacecraft is equipped with 30 Ku-band broadcasting-satellite service (BSS) transponders and 3 Ku-band fixed-satellite service (FSS) transponders.[3] It will be parked in geostationary orbit at 1.9° East.[3]