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<br />Q <br />("-) <br />..... <br />..... <br />t.I,~ <br />1M- <br /> <br />Power plant installation and transmission costs are estimated to <br />increase from about 800 million dollars in the 1966-1980 period. to <br />17,000 million dollars in the 2001-2020 period; while annual opera- <br />tion, maintenance, and replacement costs are est:lmated to increase <br />from about 6 million dollars in 1980 to 660 million dollars in <br />2020.' These costs are based on 1965 price levels. Present (1971) <br />price levels are substantially higher than those prevailing in <br />1965. <br /> <br />Future thermal power plants and transmission systems in the <br />Lower Colorado Region would be planned, designed, and constructed so <br />that any adverse effects on the environment will be minimized. <br />Thermal power plants would include cooling towers as well as equip- <br />ment for reducing particulate matter and other air pollutant stack <br />emissions. It is expected that these measures to protect the <br />enviro\'llllent will be costly, and will be reflected in increased costs <br />of electrical energy to the consumer. <br /> <br />This appendix includes an addendum showing a staging of power <br />development based on the Economics Work Group's much lower estimate <br />of future Lower Colorado 'Region electric power requirements. <br /> <br />iii <br /> <br />