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The submarines are powered by a one shaft diesel-electric system. They are equipped with two Paxman Valenta 1600 RPS SZ diesel engines each driving a 1.4-megawatt (1,900 hp) GEC electric alternator with two 120-cell chloride batteries. [2] [4] The batteries have a 90-hour endurance at 3 knots (5.6 km/h; 3.5 mph). [4]