D—4
Generator-running times were :
Mangahao.—The rainfall for tlie year at No. 1 dam was 126-54 in. compared with 123-77 in. and 110-26 in. for the previous two years. At No. 2 dam it was 11948 in., at No. 3 dam 96-52 in., and at the power-station 54-19 in. Water spilled to waste over No. 2 dam during twenty-three weeks of the year. The annual load factor was 61 per cent, on a maximum load of 21,400 kW. Generator-running times were :
Early in February, 1950, the wooden sheathing to No. 2 gate at No. 2 dam was badly holed (7 ft. by 3 ft.) by a log in a heavy flood, and was temporarily repaired by a steel-plate patch. The same rain produced a record day's rainfall of 4-65 in. at the powerstation, which so filled the tail-race that load had to be reduced. Protective groynes in the tail-race were dangerously undermined and have been repaired. While each half of the station was shut down in turn, the main turbine valves were overhauled, this being their first overhaul since their installation. Serious damage by explosion and fire was suffered by one of the Horowhenua regulators on 22nd May, 1949, resulting in its tap-changing on load gear being out of service. New ventilation facilities were provided for the control-room. The power-station completed twenty-five years of service opt 3rd November, 1949. This was marked by a celebration at the station on 24th September.
16
Generator No. Time on Load. Time Idle. Time Under Repair. Percentage Availability for Service. i Hours. Percentage. Hours. Percentage. Not in Demand (Hours). j In Demand (Hours). Tuai 1 I 5,041 57 • 55 723 8-25 2,996 65-80 2 7,084 80-87 895 10-22 775 6 91-09 3,'./ !! !! ! 7,592 86-67 992 11-32 176 97-99 i - .. Piripaua 4 " .. I 7,997 1 91-29 418 | 4-77 | 338 7 96-06 5| ! 7,072 80-73 ! 271 I 3-09 I 1,417 83-82 Kaitawa 6 6,111 69-76 1,713 19-55 935 1 1 89-31 7 6,356 72-56 1,876 21-42 527 1 93-98
Generator No. Time on Load. Time Idle. Time under Repair. Percentage Availability for Service. Hours. Percentage. Hours. Percentage. Not in Demand (Hours). * In Demand (Hours). 1 8,500 97 03 98 1-12 162 1 98-15 2 8,496 96-99 78 0-89 186 97-88 3 8,538 97-47 59 0-67 163 98-14 4 8,365 95-49 73 0-83 322 96-32 5 8,380 95-66 87 0-99 293 96-65