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3 . . P.L. 84-485, we have adjusted the repayment study to the original method. This reversion to the pre-1973 method of handling revenues from the participating projects has reduced the proposed power rate adjustment by 7.3 percent. C. Unidentified Future Transmission Investments The repayment study in the April 1979 brochure included an estimated unidentified future transmission investment of about $71 million in the 1981-84 period. P.L. 84-485 authorized specific storage units, specific participating projects, and transmission facilities related to the foregoing, but did not specify any particular transmis- sion facilities. In the 1958 repayment study and in all repayment studies since then, an amount has been included for unidentified transmission facilities. While the customers' interpretation of P.L. 84-485 may have some merit, there is nothing unreasonable about the inter- pretation of the Secretary of the Interior which was made contemporaneously with the enactment of P.L. 84-485. It appears very clear that the Congress intended a certain repayment policy and that the Secretary of the Interior's contemporaneous interpretation of congressional intent in the first repayment study should carry great weight. Further, it would appear that the historic policy, followed by Western in this rate adjustment is the most reasonable interpretation of the law. Western has restudied the matter and has decided that the $71 million of unidentified transmission facilities should be deferred from the 1981-84 period to the 1990-2020 period, with approximately one-seventh of the cost being placed in service every 5 years. The effect of this change is to reduce the proposed power adjustment by about 3.4 percent. D. Summary Following is a summary of the changes made in the new study as compared to the April 1979 study: