D—4

NORTH ISLAND SYSTEM A. SYSTEM OPERATION AND LOAD DESPATCH 1. Load The maximum half-hourly load on the system was 404,900 kW. carried between 1700 and 1730 hours on Monday, 20th June, 1949. Last year the half-hourly peak, which was also carried under normal frequency conditions, was 396,200 kW. between 1700 and 1730 hours on Tuesday, 20th July, 1948. The highest Saturday peak was 344,500 kW. between 1730 and 1800 hours on the 6th August, 1949. Last year the peak was 334,200 kW. between 1730 and 1800 hours on 17th July, 1948. The highest Sunday peak was 314,800 kW. between 1730 and 1800 hours on the 7th August, 1949, compared with 324,200 kW. between 1130 and 1200 hours on the 22nd August, 1948. The greatest weekly generation was 43,464,000 units for the week ended Sunday, 14th August, 1949, an increase of 1-9 per cent, on last year's figure of 42,648,800 units! The maximum generation on any one day was 6,588,100 units on Tuesday, 9th August, 1949 (last year 6,430,100 units), an increase of 2-5 per cent. The highest Saturday generation was 5,850,300 units on 6th August, 1949 (last year 5,715,000 units), an increase of 2-4 per cent. The highest Sunday generation was 5,399,100 units on 7th August, 1949 (last year 5,431,500 units), a decrease of 0-6 per cent. The total generation by all plants in the North Island system for the financial year ended 31st March, 1950, based on provisional returns, was 2,036,000,000, compared with 1,936,000,000 units for the previous year, an increase of 5-2 per cent. The system units generated by Government-owned plants only, plus units purchased from Supply Authorities, were 1,971,000,000 for the year ended . 31st March, 1950, compared with 1,868,000,000 units for the previous year, an increase of 5-4 per cent.

Generation details by Government plants plus units purchased for resale (compared with 1948-49) are as follows :—-

Auxiliary and standby stations— Evans .. .. 69,229,000 68,250 000 Kaouarau .. .. .. 2,872,000 3,371'000 New Plymouth .. .. 14,465,000 15'619'000 Opunake .. .. 1,925,000 M66'000 South laranaki .. .. 1,030,000 1,185,000 Taumarunui .. .. 3,572,000 3' 567" 000 Tauranga .. .. .. 7,230,000 7'339'000 Wilson's 2,726,000 865' 000 Other miscellaneous .. .. 1,983,000 7,648 000 Total units generated and 1,970,647,000 1,868,495 000 purchased * Kaitawa not in full service until October.

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Year Ended 31st March, 1950. Year Ended 31st March, 1949. Station. Maximum Kilowatts. Units Generated. Annual Load Factor. Maximum Kilowatts. Units Generated. Annual Load Factor. Arapuni Karapiro King's Wharf Mangahao Penrose Piripaua .. .. "1 Tuai .. .. L Kaitawa .. .. J 161,500 99,600 21,200 21,400 134,400 788,277,000 502,657,000 47,678,000 114,779,000 152,000 f 133,853,000 <j' 212,416,000 t 65,803,000 Per Cent. 55-7 57-6 25-7 61-1 j- 35-0 151,000 96,200 27,600 21,900118,900 742,468,000 488,667,000 40,147,000 114,109,000 2,011,000 f 131,133,000 <; 198,627,000 {_ ■ 40,623,000 Per Cent. 56-2 58-0 16-6 59-5 1 35-7* J 1,865,615,000 1/757,785,000