ENG-1987 — Page 232

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LAND, PUBLIC WORKS AND UTILITIES

provide 22 kilometres of cable circuits linking the major sub-stations at Tsz Wan Shan, Tai Wan and Lai Chi Kok.

HEC's generation system comprises the Ap Lei Chau Power Station and Lamma Power Station. The former, with an installed capacity of 761 MW, is made up of six 125 MW oil-fired generating units together with one gas turbine of 11 MW. The Lamma Power Station, at the present stage, consists of 3 x 250 MW and 1 × 350 MW dual fuel (coal or oil-fired) units together with one gas turbine of 54 MW. Another 350 MW unit will be commissioned in early 1988. The combined installed capacity of the two stations will be 2 265 MW. This will meet rising demand up to the early 1990s.

In HEC's system, transmission of electricity is carried out at 275 kV, 132 kV and 66 kV and distribution is effected mainly at 11 kV and 346 volts. With the exception of a small proportion of 132 kV overhead transmission lines, all transmission and distribution are carried out underground or by submarine cables. The supply is 50 hertz, 200 volts single phase and 346 volts three phase. Supplies at high voltage are also made available to

consumers.

The transmission systems of CLP and HEC are inter-connected by a cross-harbour link, thereby achieving cost savings to consumers through economic energy transfers between the two systems and a reduction in spinning reserve requirements. The inter-connector, which was commissioned in 1981, now has a capacity of 480 MVA. Upon full completion, the total capacity will rise to 720 MVA.

CLP's system is also inter-connected with that of Guangdong General Power Company of China and about four million units of electricity are transmitted to Guangdong Province each day. This inter-connection results in better utilisation of the company's generating plant during off-peak demand periods. On the other hand, CLP also has signed a contract with the China Merchants Steam Navigation Company to supply power to the industrial zone of Shekou. This arrangement, which affords Shekou a reliable electricity supply without subsidy from Hong Kong consumers, is another example of the close co-operation on energy matters which has developed on the two sides of the border.

On January 18, 1985, the Hong Kong Nuclear Investment Company (a wholly-owned subsidiary of CLP) and the Guangdong Nuclear Investment Company (wholly owned by the Chinese Ministry of Nuclear Industry) signed the Joint Venture Contract for the formation of the Guangdong Nuclear Power Joint Venture Company, to construct and operate a nuclear power station at Daya Bay in Guangdong Province.

The Daya Bay Nuclear Power Station will comprise two 900 MW pressurised water reactors which are scheduled for commissioning in 1992 and 1993. About 70 per cent of the power from the station will be supplied to Hong Kong to meet part of the territory's rising demand for electricity in the 1990s.

Main electricity statistics and sales figures are at Appendix 35.

Gas

Gas for domestic, commercial and industrial use in Hong Kong is supplied either as manufactured towngas and substitute natural gas (SNG) by the Hong Kong and China Gas Company Limited (HKCG) or in the form of liquefied petroleum gas (LPG) by most of the major oil companies in Hong Kong. Manufactured towngas and SNG accounted for about 56.1 per cent of the total gas sold and LPG for 43.9 per cent in 1987.

About 30 per cent of the total LPG local sales is distributed through a dealer network in portable cylinders and about 70 per cent in the form of a piped gas supply from bulk LPG storage and vaporiser installations located on or adjacent to the developments being served.