The original generating plant at Ultimo consisted of four reciprocating steam engines supplied by E.P. Allis & Co of Milwaukee, Wisconsin, each rated at 1250 horsepower (hp) and running at 100 revolutions per minute(rpm).
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A 25-50 Hz frequency changer was installed at White Bay in 1939, allowing power generated at the two railway power stations to be fed into the Sydney County Council's 50 Hz grid as required.
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Each dynamo (generator) was rated at 849.75 kilowatts (kW) at 550 volts direct current (1545 amperes) and could be overloaded by up to 50 percent to satisfy peak demand.
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Ultimo Power Station boasted a mixture of equipment, initially consisting of American-made steam engines coupled to dynamoelectric machines (direct current generators).
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