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~ ~, ~ I II . t r ~,. .. ~i.. oJ I.J OPERATION AND MAINTENANCE 15 to repay the actual costs as defined in the Boulder Canyon Project Adjustment Act of 1940, including interest, amortization, replace- ments, operation, and maintenance. In accordance with the regu- lations governing the generation and sale of power at Boulder Dam, the rates for falling water are adjusted as of June 1 of each year, to make proper corrections for variations between previ- ously estimated costs and actual costs of operation and mainte- nance of that part of the Boulder power project operated directly by the United States. Adjustments are also to be made as of June I, 1947, and thereafter at intervals of ~"e years, to reflect correc- tions in other elements entering into the rates. The rates for fall- ing water for firm and secondary energy, including the contract year June 1, 1944 t.o May 31, 194R. have been as follows: CONTIlACT YEAR HATES IN MILLS PER KWIlH FIn~l ~EC:OND:\R' 1937.38.. . 1938.39... 1939.40.__ 19~0.41 __ 1941.42____. 1942-43... 1943.44... 1944-15__. .1.163 ..___....1.163 ...1.163 1.163 __.__U60 .U72 __...___ __1.190 . __1.254 0.340 0.340 0.340 0.340 O"Jlll 0.3~6 0.357 0.398 The j'ear-by-year increase in t.he rates for falling wat.er since 1942 is a matter of considerable concern t.o all the allottees of Boulder energJ'. A committ.ee of allottees considered in detail the cost.s entering into the falling water charges and lodged with t.he Secretary of the Interior and with Congress prot.est.s against. the inclusion in the costs of Boulder City certain items not considered to be proper charges against t.he power project. The propriety of the claims of t.he allottees was recognized by Congress, which directed the Secret.ary of the Interior to investigate the charges in question and make appropriate corrections in future rate ad- j ustments. Two 82,500-kw generators, known as units N-5 and N-6, were installed originally in Boulder power plant at the request of the District and are a>;signed to its use. The generating charges, in- cluding the amortization, replacement., operation, and maintenance costs of these units are to be paid entireiy by the District unless the use of the units is shared by others, in which ca~e the charges are to be divided between the joint users in accordance with the general regulations. The generating charges pel' kilowatthour