130 



no 



100 



95 



90 



75 



70 



65 



< 



u. 

 O 



60 



55 



a so 



45 



40 



35 



30 



25 



20 



11* 



FIG.7- INSTALLED CAPACITY OF 

 ELECTRIC UTILITY GENERATING 

 PLANTS- UNITED STATES 

 1920-1954 



After J. A. Lane, October-1954 



105 



TOTAL 



W$\ 



STEAM AND 

 INTERNAL COMBUSTION 



HYDRO 



1920 



m 



'■ yyyy: &xi&, yyjy: 



%mm\ 



J 



100 



95 



90 



85 



SO 



75 



70 



60 



h 



< 



O 



-1 



55 fc 



so s 



45 



40 



35 



30 



25 



10 



1925 



1930 



1935 1940 



YEAR 



1950 



1955 



