In the frame of an ESA contract, Alcatel ETCA has developed a new generation EPC for TWTA. The major design drivers of this development were low cost, low mass, small size, and high efficiency. The EPC is able to supply TWT's from different manufacturers in the power range 15 to 170 W RF and its performances are particularly optimised for the power range 90 to 140 W RF . The design and characteristics of the EPC will be described in this paper. Five EPC qualification models were manufactured and extensively tested. Three of them were integrated with different types of TWT's. The EPC's qualification is now completed. The performances measured on these models will be presented. In particular the mass below 1.35 kg for a fully potted version able to operate at critical pressure and the efficiency exceeding 93% for the 50V regulated bus version make the EPC very competitive for the commercial telecommunication satellites market.