475 CHAPTER IV, SECTION 3 SECTION 3 ELECTRIC POWER GENERATION AND DISTRIBUTION DISTRIBUTION. On completion of the roll-up after CASTLE, all power plants at the Proving Ground had been deactivated except the plant at Elmer. This plant supplied all power demands for both Elmer and Fred until 18 October 1955, at which time increased power demands necessitated the reactivation of the Fred power plant. Power demands increased progressively at these two sites and it became necessary to acquire two 600 KW portable units to augment the generating capacity. One of these units was installed adjacent to Building 301 on Elmer and was placed on the line on 5 March 1956. The other unit was installed adjacent to Building 650 on Fred and was placed in service on 21 March 1956. Because of the critical power situation on Fred, three self-contained 150 KW units were installed as stand-by generators for vital circuits in case the shutdown of a main power plant became necessary. As temporary camps were established, power requirements were met by using portable generators until the existing power plants could be activated or plants built. The existing plants were located at sites Yvonne, Ursula, and Nan in earth-covered, reinforced-concrete structures that were partially subsurface and designed to withstand anticipated blast pressures. The power plants for Gene, Fox, and Tare were set up in expendable structures that served to house both power-generating and water distillation units. Figure 4-17. Submarine Power Cable Terminal - Elmer The Ursula power plant was reactivated on 19 September 1955. This plant was used for both camp andscientific requirements. To meet power demands, it was necessary to install two additional units of 150 KW, which increased the plant capacity to 600 KW. The Yvonneplant consisted of four 150 KW units in Building 75, which could be connected in parallel with two other 150 KW units lo- cated in the vicinity of Station 1524. These units combined provided 900 KW, which was used for both camp andscientific purposes. As a result of damage incurred during CASTLE, the prime mover of unit No. 2 in the NA 500 plant, Nan, had to be surveyed. The remaining two units were overhauled and were placed on the line on 9 March 1955. On 5 April, a 135 KW unit was added to this plant. Power demands increased and a 122 KW unit was removed from the Fred power plant and installed in the Nan plant in August 1955. Three other 150 KW generating units were installed adjacent to the plant. Through switch gear, the camp and scientific load could be carried by one set of machines or, the loads could be di- vided for close voltage regulation on scientific circuits. Generating capacities at each campsite are summarized below. At all other sites generators for meeting scientific requirements were pro- vided in numbers and capacities as shown in Tables 4-9, 4-10 and 4-11. Page 4-31