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ex:> In (;) ~ c c. Power Hoover Powerplant Operations. Stor- age at Lake Mead has been relatively low in recent years because of water withheld to fill the Colorado River Storage Project reser- voirs. Releases at the Hoover Powerplant were made only in the amounts required to meet downstream water requirements. Hoover release during the year ending May 31, 1969, was 8,014,000 acre-feet, and total en- ergy delivery to the Hoover power allottees was 3,638 million kilowatt-hours. Of this to- tal, Hoover generation plus Parker-Davis In- terchange was 2,944 million kilowatt-hours, and replacement energy amounted to 697 million kilowatt-hours. The replacement en- ergy was delivered by the United States to compensate the Hoover power allottees for deficiency in firm energy generation at Hoover Powerplant caused by the initial fill- ing of Colorado River Storage Project reser- voirs. Releases from Hoover Dam and delivery of energy to Hoover power allottees for the past 7 years are shown in Table 6. The annual Power Integration meeting was held on June 13, 1969, to discuss water releases and power generation for the ensu- ing year. The Bureau of Reclamation es- timated the 1969-70 Hoover release at 8,040, 000 acre-feet. Delivery of energy to Hoover power allottees was estimated to be 3,585 mil- lion kilowatt-hours or 88.5 percent of defined firm energy. Tobie 6 RElEASES FROM HOOVER DAM AND ENERGY DELIVERED TO HOOVER POWER ALLOTTEES Operating Year June I-May Jl 1962-63 ..... 1963-64 ................ 1964-65 ................ 1965-66 ................ 1966-67 ................ 1967-68 . 1968-69 ................ Actual Power Energy Releases from Generation at Delivered Hoover Dam Hoover Dam to A/Jottees" (Acre.Feet! (Mil. of KWH) (Mil. of KWH) 8,752,000 3,638 3,654 8,548,000 3,167 3,649 7.782.000 2.584 3.721 7,658.000 2.708 3,661 8,152,000 2,963 3,670 7,828.000 2,802 3,617 8,014,000 2,944 3,638 . Includes Hoover generation, Parker-Davis Interchange of energy with Hoover, and replacement energy for deficiency due ro filling of CRSP reservoirs. Lake Mead and Colorado River Storage Project Reservoirs. Lake Mead remained above rated power head level and the Colora- do River Storage Project reservoirs remained above minimum power operating levels throughout the 1968-69 water year. Lake Po- well first attained rated power head level on May 29, 1969, and remained above this level for the rest of 1969. Operating levels at Lake Mead and the major Upper Basin reservoirs at the beginning and end of the water year are shown in Table 7. Table 7 WATER SURFACE ELEVATIONS OF MAJOR COlORADO RIVER 8ASIN RESERVOIRS Lake Mead ........ Lake Powell...... Flaming Gorge Blue Mesa.......... Fontenelle ........ Elevation Elevation 9/10/68 9/10/69 (Feet above sea level) 1136.4 1146.9 3545.4 3573.3 5992.8 5981.8 7499.6 7507.0 6500.7 6498.4 Net Change During Year +10.5 +27.9 -11.0 +7.4 -2.3 Designated Minimum Power Operating Level 1083 3490 5871 7393 6475 Storage Above Minimum Operating Level 9/10/69 (1,000 AF) 6,107 5,582 1.593 639 145 Designated Rated Head Elevation 1.123 3,570 5.946 7.438 6.491 Storage Above Rated Head 9/10/69 (1,000 AF) 2,498 280 764 471 52 35 lill ~