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Transmission Rates F 1 rm Nonfl rm (f/KW-YR) (Mills/KWH) FY 1965 FY 1974 (Present Rates) FY 1983 (Proposed Rates)** $4.50 $6.60 $10.27 1 mill 1 mill 2 mills , Firm Power Rates Capaclty Charge Energy Charge (J/KW-MO) (Mills/KWH) FY 1962 'F'I 1974 FY 1977 FY 1981 (Present Rate)* FY 1983 (Proposed)** 1.275 1.320 1.340 1.655 2.150 3.0 3.0 3.4 4.0 5.0 FY 1962 FY 1974 FY 1977 FY 1981 (Present Rate)* FY 1983 (Proposed)** Composite Rate @ 58.2% Seasonal Load Factor Mi 11 s/KWH 6.00 6.11 6.55 7.89 10.06 FY 1976 FY 1977 & thereafter Rate for Unauthorized Overruns b tlmes the f1rm P.ower ~ate 10 times the Firm Power Rate *This rate was placed in effect in January 1981 on an interim basis, but was disapproved on October 12, 1982 by the FERC. Western has the opportunity to file a petition for rehearing, and must, under the procedures, file a substitute rate in 120 days. . **If feasibile, actual FY 1982 costs and rev~nues will be substituted for estimates in the FY 1981 stUdy. This may moqify the proposed rates slightly. A copy of any revisions in the FY 1981 studi$s will be supplied to interested parties as soon as they are available. The effective date for the proposed new rates is expected to be April 1, 1983. A comparison of the average annual costs in the studies that support the present rates (FY 1977 studies) and the proposed rates (FY 1981 studies) reveals the following: ' Average annual costs FY 1977 Studies (1978-2046 ) $48 Mill ion FY1981 Studies (1!978-2057) Difference $73 Million +$25 Million The $25 million increase in average annual costs is attributable to O&M (53%), power investments (16%), aid to participating projects (11%), interest (10%), replacements (8%), and other '(2%). The other costs consist primarily of energy purchases. 2