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. Power Market Survey - Colorado River Storage Project persons -- a slightly larger percentage (36 percent) of the population than in 1950. The agricultural, mining, and manufacturing segments of the region I s 1950 labor force accounted for 27 percent of the total. Although there is expected to be three times as many persons in the manufacturing labor force, losses in the agricultural segment and slow growth in mining results in a decrease from 1950 in the percentage of persons in these three components, to 22 percent of the total. . The 73 percent of the 1950 labor force in the "All Other" category; about 983,000 workers, was divided approximately as follows: 27 percent to wholesale and retail trade; 13 percent to professional and related services; 12 percent to transportation, communications, and public utilities; 11 percent to construction; and the balance to numerous categories, including government and personal services, each amounting to less than 10 percent of "All Other." It is estimated that the 1980 "All Other" will be distributed aJl10ng its n:wnerous categories in about the s~e percentages as in 1950. The region in 1950 had a population of 3,808,259 persons and it was growing rapidly. From 1940 to 1950 the population increased 28 per- cent, almost double the increase experienced in the nation, and it is estimated that between 1950 and 1955 an increase of almost 20 percent took place. However, the region is not densely populated, having in 1950 approximately 7.5 persons per square mile, as compared to 51 per- sons for the United States. By 1980 it is estimated that the population will be 8,209,000, or over twice that of 1950. Most of the region's inhabitants in 1980 will,. be concentrated in towns and cities, while but 4.7 percent will be on ran::hes and fanns. Past Power Requirements The electric utility loads of the region have increased rapidly in the past. During the decade 1945 to 1955 the average annual increase was 11.4 percent indicating a doubling in the requirements about every 6.5 years. During this period the average growth by areas ranged froJll 9.8 percent per year in Area III, Utah, to 15.1 percent in Area I, Southern Nevaqa. The region's electric utility energy requirements in 1955 amounted to 13.5 billion kilowatt-hours and, in addition, industrial- owned generating plants supplied for their own use 2.6 billion kilowatt- hours. . For the region as a whole the electric utility sales in the indus- trial classification in 1955 were higher than in any other class -- 30.9. percent -- closely followed by nonfann residential and cOlllll1ercial. The industrial classification has however decreased in relative importance during the past -- 51 percent in 1940, 43.3 percent in 1945, and 30.9 percent in 1955. In the nation as a whole the percentage has been in the general range of 50 percent throughout the 1940 to 1955 period. . - v -