506 REPORT—1905. 
As regards the ‘ diversity factor’ the term is used to denote the ratio of the 
maximum load to be supplied by the central power plant to the sum of the 
individual consumer’s maxima. Its value depends, of course, upon the extent to 
which the various consumers’ deman{s overlap one another. 
On the Rand the load factor of the plant at many of the individual mines is as 
high as 05 or 06. It may therefore be assumed, in order to be on the safe side, 
that the average of the consumers’ load factors would be about 40 per cent. 
On the basis of a consumption of 800,000,000 units per annum and a 
40 per cent. load factor, the sum of the consumers’ maximum demands would 
be 82,200 kwts. 
On the assumption of a diversity factor of 60 per cent. and a 20 per cent. loss 
in distribution and transformation, a plant capacity at the generating works of 
60,000 kwts. would be required. 
Capital Outlay. 
At the generating works provision should be made for seven generating sets, 
each of a capacity of 10,000 kilowatts. The cost of the power house and gene- 
rating plant, electric lines, transformers, sub-stations, storage tank, land and road- 
making, contingencies, engineering and supervision fees, &c., is estimated at 
1,850,0007., and the working capital at 150,000/., making a total of 2,000,000/. 
Costs of Working. 
These are compiled on the basis of an output of 375,000,000 units, and may be 
estimated as follows :— 
£ 
Coal on the basis of 4 lbs. per unit and 10s. 6d. per ton (of 2,000 lbs.) 393,750 
Water (to make up for condensing and for boiler feed), 1} gallon 
per unit at 3s. 6d. per 1,000 gallons. : - 82,031 
Oil, waste, and stores : 5 = - : : c 5 é 3,125 
Wages. : : : < : : : - : i . 62,000 
Management, rent, rates, insurance, &c. . : > ; 5 . 12,000 
Repairs and maintenance, 3 per cent, on capital 
outlay, viz. . 5 : 4 4 ; . £2,000,000 
Less working capita ; é : ; 5 . 150,000 
£1,850,000 9,250 
552,156 
Add 5 per cent. for contingencies . : : { . ° - 27,607 
579,763 
Capital charges— 
5 per cent. on 660,000 debentures and 10 per cent. on 1,340,000 
ordinary capital . ; : : - : : i 5 . 167,000 
Reserve fund— 
For depreciation and antiquation fund and 2 per cent. on capital 
outlay on plant . r : A F : : . 37,000 
Total 3 . 783,763 
Margin to the good 3 : ° . : - é : - 91,237 
£875,000 
Revenue. 
300,000,000 units delivered to consumers at 0:7. per unit . , £875,000 
Financial Results. 
On the above basis it will be seen that a sufficient profit would be available to 
provide 5 per cent. on the debenture capital and 10 per cent. on the ordinary 
capital after setting aside 37,0007. per annum to reserve fund to cover deprecia- 
tion and antiquation of the plant. 
