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. I I I I I I I I I I I I I I I I ,I I I I PROPOSED FEDERAL TRANSMISSION SYSTEM Three maps, attached as Exhibits 1, 2, and 3, indicate basic transmission requirements for the purpose of (1) carrying Colorado River Storage Project power to load centers where it can be taken by preference customers, (2) interconnecting the various proposed hydro- electric developments of the project to allow integration and maximum production of these resources and (31 interconnecting over Federal lines with adjoining Federal systems to achieve greatest latitude in interchange and standby. The three maps show transmission lines which are anticipated as being required not later than 1970, 1975 and 1980 respectively for the distribution of loads assumed. In order to meet generation programs, a major part of the lines shown in 1970 will actually be required by 1965 or earlier. Existing Federal transmission facilities are shown in heavy lines, existing private utility facilities in lighter lines and proposed Colorado River Storage Project facilities in lines of various colors de- pending upon transmission voltage. Obviously the indicated system will be subject to modification when final power allocations are made but such modifications are not anticipated to materially alter overall costs. The system is also well adapted to expansion to connect other potential but presently unauthorized hydroelectric developments in the project area, none of which have been assumed as potential resources in this report. As an example, if three 230 KV transmission lines are con- structed as shown to carry up to 525 megawatts to Arizona in 1970 and the permissible flow is reduced in succeeding years, one or two of these lines can be assigned to the Marble Canyon development. This development - 10 -