The heavy-duty carrier version Ariane 5 ECA can bring a useful load of 9.6 tons in the geo-stationary transfer orbit (GTO), compared to a useful load capacity of 6.7 tons of the Ariane 5 Generic. A cryogen orbiter, driven by a HM7B power plant (which was already used for the third stage of the Ariane 4) was used. The French space agency CNES and EADS Astrium have developed the two-phase cooling circuit and the heat pipe, which are integrated into the cylindrical useful load. With the Ariane 5 ECA the company can now comply with higher performance, flexibility and competitiveness of the growing enquiry for initial services by the satellite telecommunication industry. EADS SPACE Transportation takes responsibility for the development, integration and start preparation of the complete Ariane 5 orbiter EPS (Etage Propergols Stockables) including the orbiter power plant Aestus in Ariane 5 programme. With up to ten tons of liquid propellant, EPS can be re-ignited in the flight after spotting a useful load in order to position further useful load at another location.
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