interest rates, construction costs, and macroeconomic variables such as GNP and California per capita income.” Id Both models project future prices of electricity in different sectors, and reach different results. Both attempt to predict the price of fuels such as natural gas that, in some uses, may substitute for electricity. Both attempt to assess the degree to which conservation will curtail demand. Should the Commission attempt to widen its examination to encompass ever larger areas, it could not rely on existing studies of smaller regions; piecing together studies limited to smaller regions would ignore the interconnections and synergistic effects a study of the larger area would show. Cf. Kleppe v. Sierra Club, 427 U.S. 390, 409-10, 96 S.Ct. 2718, 2729-30, 49 L.Ed.2d 576 (1976) (<HOLDING>). The Commission’s task, if it were to embark
holding that prejudice may result from the cumulative impact of multiple deficiencies holding improperly admitted evidence may be harmless if cumulative recognizing impact of child support guidelines recognizing that segmentation of an environmental investigation may slight cumulative or synergistic environmental impact holding that the exclusion of cumulative evidence did not materially impact defendants right to present a defense