Territory Stories

Debates Day 3 - 09 December 1976



Debates Day 3 - 09 December 1976

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Parliamentary Record 16


Northern Territory. Department of the Legislative Assembly


Debates for 1st Assembly 1974 - 1977; Parliamentary Record; ParliamentNT; 1st Assembly 1974 - 1977




Made available by the Legislative Assembly of the Northern Territory





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pages 899 - 949

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Attribution International 4.0 (CC BY 4.0)

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Legislative Assembly of the Northern Territory



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DEBATES - Thursday 9 December 1976 a brief statement prepared by the Department of the Northern Territory and follow with information of my own. The department has supplied, to me a document which is a brief report on the condition of Darwin's electricity supply, what service constmJers can expect in the future and what action is being taken to correct the current problems. The Stokes Hi II Power Station has a nominal capacity of 94 megawatts with all sets functioning. The maximum demand on the system to date has been 53 megawatts, corrrpared with 47 megawatts before Cyclone Tracy. There is also a gas turbine which provides an addi-tional 8 megawatts in emergencies. On 26 November 1976, No. 5 unit, a 23.5 megawatt unit, suffered damage to the turbine blade system requiring its immediate withdrawal from service. No. 3 unit has been out of service since August 1976 for modifications to reduce air' heater corrosion and irrrprove flue gas emission quality. This modification has been outstanding since 1974 and was only commenced after No. 6 unit, commissioned 1:n March 1976, was operating satisfactorily. Without Nos. 3 and 5 units, the nominal capacity of Stokes Hi II Power Station is 54.5 megawatts. However, the actual output is less than 50 megawatts at the present, necgssi tating the l o unning of the gas turbine for several hours per day. until No. 1 unit can be taken out of service for about 8 hours for cleaning of condenser tubes, its output is almost 4 megawatts below its normal output. No. 3 unit has been on line this week but has not yet taken full load GS adjustments to the new burner system are still being made. No. 3 should be in normal service shortly and the immediate crisis will be over, allowing No. l's condenser tubes to be cleaned and some other maintenance to be caY'Y'ied out. Units Nos. 7 and 8 are due to be commissi oned in March 1978 and September 1978 respectively. It is proposed to install the turbine blade sys-tem for No. 7 unit in No. 5 unit and to have it in service by the end of February 1977. The blade system for No. 8 unit will then be installed 922 in No, 7 unit, allowing it to be commissioned as scheduled, in March 1978, with No. 8 unit following, as scheduled, in September 1978. Provided there is not another major breakdown, generating capacity will then be adequate until 1981-82. After this time, additional generating capacity will be required. The 66 kilovolt transmission system was put back into service after cyclone Tracy with damaged conductors, substandar>d sUPPOY'ts and inadequate switching facilities. In the past 12 months, 66 kilovolt lines have fallen to the ground on several occasions where damaged conductors have failed. This can ocCUr' again, particularly during storms. Even a moderate cyclone would destroy several sections of the 66 kilovolt line with substandar>d supports, particularly in t he Rapid Creek and McMi llan ' s Road areas. The McMinn's line and the Casuarina Zone Substation are connected to the same circuit from the Shell Street Zone Substation. As a consequence, line faults on the McMinn's line which are very common during the wet season, cause interruption to supp lies to the northern suburbs supplied from Casuarina Zone Substation. To l oelieve this situation, the construction of the 66 kilovolt line in Rothdale Road is proceeding as a matter of urgency. The construction of the Snell Street to McMinn's Zone Substation 66 kilovolt line is also a matter or urgency. This line was originally programmed for completion in 1976 but was deferred and is now scheduled for completion in 1977. The permanent rehabilitation of the distribution system is a major task which has not yet commenced. Reports to the DRC in 1975 were updated in August 1976 and November 1976. A decision is still to be taken whether the permanent distribution system would be underground or remain overhead in existing and new suburbs. The distribution system was patched up to restore it to service as quickly as possible to meet the demands of individual areas during 1975. As a result of this, we have many areas where low

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