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r f , ,. ,." .l....~~.' CONSTRUCTION UTILITIES I3I power was indicated by these studies and, assuming a 5%-year de- mand period, the energy required was estimated at 235,000,000 kw- hI' with a possible maximum of 270,000,000 kw-hr. The various al- ternatives considered as sources of power supply for aqueduct con- struction included the following: (1) Existing utilities, with de- li,'err to District transmission lines at one or several points; (2) a District steam-electric plant on the Pacific Coast with a transmis- sion system to and along the aqueduct; (3) a Diesel-electric plant near Colton with transmission system along the aqueduct; (4) six Diesel-electric plants, located at approximately equal distances along the aqueduct; (5) Diesel-electric units and direct Diesel drive, where possible, at each load center. Using published rates as a basis, without any allowance for the possibility of special municipal rates, power purchased from ex- isting utilities was found to be lowest in cost delivered at the load points followed by the other methods in the order listed in the pre- ceding paragraph. Furthermore, purchased power could be deliver- ed immediately upon completion of the transmission system, where- as to acquire equipment and build a steam-electric plant would have required upwards of 18 months, and to deliver and install large Diesel units from 6 to 12 months. A very important advantage of a purchased power supply lay in the fact that such a power supply could be instantly increased up to the limit of the transformer ca- pacity and, in the event further expansion should be necessary, addi- tional transformers could be obtained in less time than would be required for the purchase and installation of additional Diesel or steam units. On June 4, 1932 a notice was issued inviting bids for supplying electric power for the construction of the aqueduct, under three alternative items providing for delivery at one or several points in the vicinity of or along the aqueduct route. A joint bid from the Southern California Edison Company, Ltd., Southern Sierras Power Company, and Los Angeles Gas and Electric Corporation was made under one item only of the notice, namely, for delivery at Colton of 23,000 kilowatts (30,800 horsepower) at 66,000 volts, and an additional 4,000 kw upon request of the District made at any time during the life of the contract. The rate bid was $1,500 per month for 66 months after beginning power delivery, plus 95 cents per month per kilowatt of maximum demand, plus 5 mills per kilowatt hour, with a minimum charge of $3,000 per month.