Page 8

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Page 8
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How Boulder Dam will refinance Colorado River Project : statement to Congressional Colorado River Commission regarding present and probable future power demands, power supply and cost per K.W.H. for Southern California
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http://digital.library.unlv.edu/u?/dig,8
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TABLE NO. 7 Cost of Boulder Canyon Power with Peak Steam Service and Standby _______________________________________________________________________________________________________________________________________________________ 35 Years Amortization All Inv. 41 Years Amortization Government Inv. 35 Years Amortization Other Inv. _________________________________________________________________________________ Cost of Power at Boulder 2.26 Mills Cost of Power at Boulder 2.14 Mills _________________________________________________________________________________ $1.25 Oil $1.00 Oil $1.25 Oil $1.00 Oil _______________________________________________________________________________________________________________________________________________________ Basis-Per Cent Peak at Boulder 90.5% 90.5% 90.5% 90.5% (1) Boulder Canyon Capacity-Peak Input to Lines K.W 675,000 675,000 675,000 675,000 Load Factor Per Cent 61% 61% 61% 61% (2) Transmission Circuits-Number 6 6 6 6 Size of Conductor-c.m. 600,000 600,000 600,000 600,000 Voltage 220,000 220,000 220,000 220,000 K.W. Per Circuit-Normal 112,500 112,500 112,500 112,500 (3) Output of Boulder Canyon K.W.H. Per Year 3,600,000,000 3,600,000,000 3,600,000,000 3,600,000,000 Delivery at Los Angeles K.W.H. Per Year (.88) 3,168,000,000 3,168,000,000 3,168,000,000 3,168,000,000 Delivery at Los Angeles K.W. 593,0000 593,000 593,000 593,000 (4) Transmission Line Investment $ 50,000,000 $ 50,000,000 $ 50,000,000 $ 50,000,000 (5) Auxiliary Steam Plant: (a) Peak-Plant Capacity K.W. 71,000 71,000 71,000 71,000 (b) Standby Plant Capacity K.W. 112,500 112,500 112,500 112,500 (c) Per Cent Overload Auxiliary Plant 5% 5% 5% 5% (d) Installed Capacity Auxiliary Plant K.W. 175,000 175,000 175,000 175,000 (e) Auxiliary Plant Capital @ $110 Per K.W. Capacity $ 19,250,000 $ 19,250,000 $ 19,250,000 $ 19,250,000 (f) Peak Plant Output K.W.H. Per Year 32,000,000 32,000,000 32,000,000 32,000,000 (g) (17 Hrs. Per Day K.W.)(Standby Cap. Floating) 75,000 75,000 75,000 75,000 (h) Standby Output 17 Hrs. Per Day K.W.H. Per Year 52,500,000 52,500,000 52,500,000 52,500,000 (i) Total Output Aux. Plant K.W.H. Per Year 84,500,000 84,500,000 84,500,000 84,500,000 (h) System Peak-Boulder Canyon and Aux. Steam K.W. 664,000 664,000 664,000 664,000 (7) Total Los Angeles Delivery K.W.H. Per Year 3,252,000,000 3,252,000,000 3,252,000,000 3,252,000,000 (8) Cost of Boulder Canyon Power at 55% Load Factor $ 8,136,000 $ 8,136,000 $ 7,704,000 $ 7,704,000 (9) Credit for Saving at Boulder Canyon $ 236,900 $ 236,900 225,900 225,900 _____________ _____________ _____________ _____________ (10) Cost of Power from Boulder Canyon $ 7,899,100 $ 7,899,100 $ 7,478,100 $ 7,478,100 (11) Transmission Costs @ 8.357% 4,178,500 $ 4,178,500 $ 4,178,500 $ 4,178,500 _____________ _____________ _____________ _____________ (12) Total Hydro and Transmission Costs $ 12,077,600 $ 12,077,600 $ 11,656,600 $ 11,656,600 (13) Auxiliary Steam Costs: Non-Variable Cost @ 10.157% + Standby Fuel $ 2,156,000 $ 2,116,000 $ 2,156,000 $ 2,116,000 Variable Cost-Power Produced @ 2.69 Mills 228,000 185,000 228,000 185,000 _____________ _____________ _____________ _____________ Total Auxilary $ 2,384,000 $ 2,301,000 $ 2,384,000 $ 2,301,000 (14) Total-Cost at Boulder + Transmission + Steam Auxiliary $ 14,461,600 $ 14,378,600 $ 14,040,000 $ 13,957,600 (15) Average Cost-Mills Per K.W.H.-B. C. With Steam 4.45 4.42 4.32 4.29 ======================================================================================================================================================= TABLE NO. 8 Explanation of Calculations for Items 9, 11 and 13 on Table 7-A ________________________________________________________________________________ ITEM 9: Credit for Saving at Boulder Canyon: Saving in investment by building a 675,000 Kw. power plant at Boulder Dam instead of a 746,000 Kw. power plant based on an interpolation of costs of various sizes of power plants given in the Report of F. E. Weymouth....$3,100,000 Fixed Charges: 35-Year Amortization 41-Year Amortization Interest.......................... 4.000% 4.000% Amortization...................... 1.358% 1.000% Depreciation...................... .750% .750% ________ ________ Total.......................... 6.108% 5.750% Annual fixed charges.....................$189,300 $178,300 Operation-based on $500,000 per year for a 1,000,000-hp. plant...............47,600 47,600 ________ ________ Total annual charges.....................$236,900 $225,900 ITEM II: Annual Transmission Costs: Interest.................................. 5.000% | Amortization (35 years).................. 1.107% | Depreciation.............................. 1.250% | Total......8.357% Operation................................. 1.000% | ITEM 13: Auxiliary Steam Costs-Annually: Investment-$110 per Kw. of capacity, or.........................$19,250,000 Non-variable charges | Interest...............5.000% | applied to invest- | Amortization...........1.107% | ment - 35 years' | Depreciation...........2.250% | Total.....10.157% amortization | Operation..............1.800% | Standby fuel 1.1 bbls. of oil per year per capacity floating on line (71,000 plus 75,000, or 146,000 Kw.). Variable Charges: Fuel: 1/500 bbl. of oil..............2.00 mills per Kw. Hr. for $1.00 oil per Kw. Hr.......................2.50 mills per Kw. Hr. for $1.25 oil Operation: .19 mills per Kw. Hr. Total fuel and operation...............2.19 mills per Kw. Hr. for $1.00 oil 2.69 mills per Kw. Hr. for $1.25 oil ================================================================================ TABLE NO. 9 Cost of Providing for 664,000 Kw. Demand From Steam Plant Substitute for Boulder Canyon Power Bureau of Power and Light, City of Los Angeles, California. October, 1928 _________________________________________________________________________ Capacity of Station-Kw............................................664,000 K.w.h. per year produced....................................3,252,000,000 Investment @ $110 per Kw. Capacity.............................73,040,000 YEARLY COSTS-35-YEAR AMORTIZATION Present Economy-$1.00 Oil | Interest.......5.000% | | Amortization...1.107% | Non-Varilable Charges | Depreciation...2.250% | ll.l57% $ 8,149,000 | Operation......1.800% | | Standby........1.000% | Fuel and Operation @ 2.19 mills per Kw-h.....................7,123,000 _____________ Total Yearly Cost........................................$ 15,272,000 Cost-mills per Kw-h......................................... 4.69 Future Economy-$1.25 Oil | Interest.......5.000% | | Amortization...1.107% | Non-Variable Charges | Depreciation...2.250% | ll.407% $ 8,331,000 | Operation......1.800% | | Standby........1.250% | Fuel and Operation @ 2.69 mills per Kw-h.....................8,749,000 _____________ Total Yearly Cost........................................$ 17,080,000 Cost-mills per Kw-h......................................... 4.90 Gross Cost-mills per Kw-h................................... 5.25 *Improvement in Economy in 10 years-mills per Kw-h......... .35 _____________ Cost-Mills per Kw-h......................................... 4.90 *IMPROVEMENT IN ECONOMY IN 10 YEARS Present Economy-450 Kw-h. per bbl. oil at $1.25 per bbl.........................................2.78 mills per Kw-h. Future Economy-10 years, 535 Kw-h. per bbl. oil @ $1.25......................................2.29 " " " | Boiler Room Losses...9% Turbine Economy 9650 B.T.U. per Kw-h. | Operating Losses.....4% | Auxiliary power......4% Decrease in fuel cost per Kw-h. in 10 years..... .44 mills per Kw-h. Increase in fixed charges @ 8.50% on increased investment of $5 per Kw. of installed capacity-55% load factor........... .09 mills per Kw-h. _____ Improvement In Economy in 10 yrs................ .35 mills per Kw-h. ========================================================================= Page 8

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