The author outlines the more important considerations leading to the design of the 100,000-kw unit at Essex and the four-unit Sewaren Generating Station. Outstanding features are semioutdoor boilers at latitude 41°; 1050 F steam temperature; a simplified plant layout, including the unit system; central control; shaft-end house generators; and all-electric auxiliary drive. The improvements in calculated plant heat rates are shown for the progressive steps of the program. Some of the more important electrical and architectural features are described.

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