Building complete, including excavation, filling of lot, bulkhead wall, concrete foundations for building and machinery, intake and discharge tunnels, power-house of brick, office buildings complete with interior fittings and plumbing, and one masonry chimney, all of sufficient size to contain equipment of 3 000 kilowatts... Land and Building... Complete equipment for 2 000 kilowatts, including boiler plant, turbo-generators, oil switches, cranes, coal storage and handling machinery, and all accessories inside of the building...... Ccal and Ash Handling and Storage Plant outside of building Central Station complete, with building for 3 000 kilowatts and equipment for 2 000 kilowatts.... $55 000 150 000 $205,000 190 000 18 000 $413 000 The lot included in the above estimate is sufficiently large for a plant of 12 000 kilowatts capacity. If the building is constructed for only 2 000 kilowatts instead of 3 000, as included in the estimate above, $40 000 should be deducted from the cost; on this basis, the total cost of building and equipment alone will be $318 000, equal to $159 per kilowatt. The annual output of the station will be This is on the assumption of an efficiency of 80 percent; the energy delivered to the lamp terminals is 3 840 000 kilowatt-hours for arc service, and 200 000 kilowatt-hours for incandescent service. The energy required for incandescent service is calculated on the basis of each lamp connected burning 200 hours per year. This is an average determined from the wattmeter readings, given on the City bills for 1905, for Richmond. TABLE 3. TOTAL COST OF ELECTRIC ENERGY DELIVERED TO LAMPS. Total cost at power-house, 5 050 000 kilowatt-hours Maintenance, Repairs and Inspection of Distribution Total Cost per kilowatt-hour delivered to lamps.... (4 040 000 kilowatt-hours delivered.) $45 500 40 000 15 000 $100 500 2.49 cents TABLE 4. ANNUAL COST TO SUPPLY ONE ARC LAMP. Electric energy, 1920 kilowatt-hours at 2.49 cents.. Maintenance Depreciation Total TABLE 5. $47.80 8.00 21.10 14.90 $91.80 COST PER KILOWATT-HOUR FOR ELECTRIC ENERGY DELIVERED TO INCANDESCENT LAMPS. Energy Maintenance Depreciation Interest Total TABLE 6. TOTAL OPERATING AND FIXED CHARGES. 2000 arc lights at $91.80.... 200 000 kilowatt-hours at 16.40 cents. Total In the above tables, depreciation is taken at six percent on the total of all the items of Table 1, with the exception of real estate, engineering and contingencies and interest during construction. Interest is taken at 3.5 percent on the total cost. To compare the cost of lighting the Borough of Richmond from the proposed City plant with the cost of lighting this Borough under the law in ef fect July 1, 1905, the number of lamps burning on December 31, 1905, is taken as a basis of comparison; the number of lamps connected on this date is less than the round figures used in the above estimate (in these figures are included 7 500 equivalent incandescents for buildings in course of erection, and 1 600 equivalent incandescents for power). On December 31, 1905, the following lamps were connected: The cost of lighting these lamps under the new rates would be $154 000. This is on the basis that all street lamps burn 4 000 hours a year and building lights 200 hours per year. The City plant would give equivalent lighting from 1826 arc lamps and 9673 incandescent lamps. The cost would be: 1826 arc lamps at $91.80.... 96 730 kilowatt-hours at 16.40 cents. Total $167 500 15 900 $183 400 The annual cost of supplying equivalent service from the proposed plant would therefore be $29 400 in excess of the cost under the law in effect July 1, 1905. This is on the basis of the main feeders being placed underground; if these should be placed overhead, as are all power circuits in Richmond at present, there would result a reduction of about 15 percent in the first cost of the plant and the excess annual cost would be reduced to only $12 500. We would also call attention to the fact that the lighting supplied by the City plant would in reality be superior to that now furnished the City, since the estimates herein are for arc lamps of 2 000 candle-power, whereas the present arc lamps in Richmond are 1200 candle-power or less; further, gas and kerosene lighting would be entirely eliminated. Respectfully, CARY T. HUTCHINSON, Chairman. NELSON P. LEWIS, Secretary. GEORGE F. SEVER, |