. Electric railway review . se switchboard. These curves are about the best obtain-able from any power houses of 5,000 to 10,000 horsepowercapacity with coal from $ to $ per ton. In Figure 2 the same costs are shown, but plotted interms of load-factor and price per kilowatt-hour. Particular no-tice should be given to the wide variation in cost per kilo-watt-hour, it ranging in the steam plant from 9 cents at aload-factor of 4 per cent to about three-quarters of a cent at100 per cent load-factor. The hydro-electric plant varies underthe same range of load-factors, from 10 cents to less
. Electric railway review . se switchboard. These curves are about the best obtain-able from any power houses of 5,000 to 10,000 horsepowercapacity with coal from $ to $ per ton. In Figure 2 the same costs are shown, but plotted interms of load-factor and price per kilowatt-hour. Particular no-tice should be given to the wide variation in cost per kilo-watt-hour, it ranging in the steam plant from 9 cents at aload-factor of 4 per cent to about three-quarters of a cent at100 per cent load-factor. The hydro-electric plant varies underthe same range of load-factors, from 10 cents to less than halfa cent per kilowatt-hour. In Figure 3 is given a very convenient and easy methodof changing cost per horsepower per year at various load-fac-tors to equivalent cost per kilowatt-hour oi- vice-versa. Themethod to be followed in making the change Is self evident,so no explanation of it is needed. If we now take up the case of a hydro-electric plant andtransmission system with a wholesale cost of $30 per horse- f S::.. Figure 2.—Showing IVlethod of Plotting Costs Per Horsepower PerYear in Terms of Load-Factor and Price Per power per year, and attempt to make a flat rate to all con-sumers, we quickly find there is little demand for power, asnearly every consumer has an intermittent load, or. in otherwords, a low load-factor, and cannot afford to pay or willnot pay the price it is necessary to ask for flat-rate24-hour power. It then becomes incumbent on the powercompany to devise a system of charging that will not only July, 1906. ELECTRIC RAILWAY REVIEW -10!) enable it to market its output but to do so at inices Uuu willsecure a net revenue for the power equal to |30 jer liorse-power-year, besides an additional amount sufflcient to coverthe cost of retaining or distributing it. but to further enable itto sell at rates low enough to be attractive to consumers. Itis believed that the method described hereinafter offers asolution that is equitable to both po
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