COST OF HYDRO-ELECTRIC POWER PLANTS 735 



ESTIMATE OF ANNUAL COST 

 For 300,000 Electrical Horse-power Continuous Development 



Based upon similar assumptions to those for the 200,000 E.H.P. development. 

 Annual replacement fund, for fifty-year life portion, $13,200,000 



at per cent $88,000.00 



For fifteen-year life portion, $6,500,000 . 00, at 5 per cent . 325,000 . 00 



Annual interest, $19,700,000.00, at 4 per cent 788,000.00 



Annual maintenance and repairs 90,000 . 00 



Attendance and administration 119,000 . 00 



Total annual cost $1,410,000.00 



Annual cost per E.H.P. of base load $4.70 



Additional 25 per cent 1 . 20 



Annual cost if only 80 per cent of the power is used. . $5.90 



ESTIMATED COST OF PROPOSED COLUMBIA RIVER PROJECT 

 Capacity : 



480,000 horse-power 12 months per year 



600,000 horse-power 11 months per year 



700,000 horse-power 10 months per year 



800,000 horse-power 8 months per year 



The following cost estimate on this proposed extensive devel- 

 opment is taken from an article by Mr. L. F. Harza in the Journal 

 for Electricity, Power and Gas, for March 18, 1916, and the readers 

 interested in this unusual development are referred to the long 

 series of articles appearing in said journal during 1915 and 

 1916. 



Contingent Margin. The total cost of each item as given in 

 the estimates which follow all include a margin of 25 per cent to 

 cover engineering, administration during construction, and con- 

 tingencies in addition to the amounts obtained by applying the 

 foregoing unit prices, except in the case of the generating machin- 

 ery; in this case only 15 per cent was allowed, as these estimates 

 are based upon the higher of two or more actual quotations in 

 nearly all cases, and the manufacturer himself would furnish the 

 engineering talent except for erection, which item has been in- 

 cluded in the estimate. 



