D—4

Generation details by Government plants plus units purchased for resale (compared with 1945-46) are as follows: —

Auxiliary and standby stations — Evans Bay .. .. 86,618,160 47,338,100 Hawke'sßay .. .. 1,262,189 1,004,814 Kourarau ' .. .. 2,973,397 2,846,829 New Plymouth .. .. 16,156,070 15,674,460 Onehunga .. .. 2,941,330 441,568 Opunake .. .. .. 1,633,59.9 1,648,838 Palmerston North .. .. 5,407,422 2,510,965 Poverty Bay .. .. 1,796,220 787,950 South Taranaki .. .. 1,112,024 230,816 Taumarunui .. .. 3,230,100 3,473,330 Tauranga .. .. 7,244,415 8,839,844 Wilson's .. .. .. 2,926,200 2,824,200 Other miscellaneous purchases 4,767,658 3,265,621 Total units generated and 1,656,314,025 1,576,005,851 purchased' 2. Reliability of Supply There were 261 faults, 20 of which caused no interruption to supply. Several faults were cumulative, affecting more than one district. Some of these were due to the system being overloaded. Lightning was responsible for 49 troubles, 11 of which occurred within three days. A detailed analysis of interruptions is shown on the following table. These do not include pre-arranged shutdowns due to load rationing :

7

Year ended 31st March, 1947. Year ended 31st March, 1946. Station. Maximum Kilowatts. Units generated. Annual Load Factor. Maximum Kilowatts. Units generated. Annual Load Factor. Arapuni Horahora King's Wharf Mangahao Penrose Piripaua .. .. Tuai .. 150,000 12,500 33,009 21,000 44j 000 63,900 786,185,000 88,235,950 47,582,495 113,582,000 9,089,920 182,872,510 290,697,366 Per Cent. 59-8 80-6 16-4 61-7 47-4 51-9 130,000 12,300 28.899 20.900 62,700 897,224,300 94,847,530 47,023,796 124,823,000 2,775,150 126,295,040 192,129,700 Per Cent. 78-7 88-0 18-5 68-1 32-7 34-9 1,518,245,241 1,485,118,516

Description. Year ended 31st March, 1946: Number. Year ended 31st March, 1947. Distributing Authorities affected. 3 13 10 6 2 3 25 2 2 9 14 • 5 12 9 14 30 25 Number. Duration. 1. 110 kV. lines : Defects 2. 110 kV. lines : External causes 3. 33 kV„ 50 kV., or 66 kV. lines : Defects 4. 33 kV., 50 kV., or 66 kV. lines : External causes 5. 6*6 kV. or 11 kV. lines : Defects 6. 6-6 kY. or 11 kV. lines : External causes 7. Lightning 8. Storms : Nature of trouble not found .. 9. 110 kV. apparatus 10. 33 kV., 50 kY., or 66 kY. apparatus 11. 5 kV., 6-6 kV., 11 kY, or 22 kV. apparatus 12. Generators or synchronous condensers .. 13. Relays 14. Control circuits and batteries 15. Operation: Mistakes 16. Operation: Accidents 17. Faults and overloads on consumers' system 18. Other causes 19. Cause unknown Totals 1 2 9 9 5 4 30 5 ii 9 1 4 5 7 7 38 11 6 6 11 13 3 2 49 2 2 9 30 1 5 10 6 7 *82 17 h. m. 0 39 1 27 14 18 3 47 52 48 1 34 34 32 0 07 2 28 1 49 27 52 0 34 4 56 0 51 2 34 7 46 3 57 158 261 161 59 184