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o c-; c-~ \'."'l ~ <:.Q -14- In order to firm the output of the pr 1ject power plants to 720.000.000 kilowatt-hours per annum at the plants. or 648.000.000 kilo- watt-hours at the market. it is estimated that for such a pariod as 1902 to 1941 it would be neoessary to purohase an average of 15.300.000 kilo- watt-hours of off peak steam energy per annum. These purohases would be made in only 14 years of the 40 year period. but the purchases in those years would be in such amounts as to make the average for the entire 40 years 15.300.000 kilowatt-houra. It is not known how much this off-peak stelUIl energy wou ld cost tre United States. Essentially it is only fue 1 replacement energy. the cost of which in this region. including overhead. is about 2 mills per kilowatt-hour. However. for the purpose of this report a price of 5 mills per kilowatt-hour at the market was assumed. The average annual ooat of the purchased steam energy therefore was as- surned to be %9,000 The total annual estimated oost of generating and delivering the project energy is $2.528.000. It is estimated that for such a period as 1902 to 1941 an average total of 890,300.000 kilowatt-hours of energy would be available per ann1.\Ill. from the project. 648.000.000 kilowatt-hours of which would be firm emrgy and 154.700.000 kilo......tt- hours of whi ch would be secondary energy at the market. transmission losses being estimated at 87.600.000 kilowatt-hours. The estimated annu- al revenue from the sale of secondary energy at 1.8 mi lIs is $279.000 leaving the sum of $2.249.000 as the cost of generating and delivering the firm energy. whioh is at the rate of 3.47 mills per kilowatt-hour. The assumed market is wholesale and not retai 1.