Abstract :
The first part of the paper outlines the functions of the steam plant furnishing relay and supplemental power for the system whose normal source of power is water, and illustrates graphically and otherwise the relative importance of the various functions and characteristics of the supplemental plant. It further illustrates by diagrams in a hypothetical case the division of load between the hydraulic and supplemental sources of power. The second part of the paper discusses some general data obtained from a number of New England waterpower systems, indicating the extent to which the water power is supplemented by steam and the methods of utilizing supplemental capacity.
