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Transmission & Distribution

The Marsh Road Station Building adopts a green building concept

The Marsh Road Station Building adopts a green building concept

HK Electric’s cable tunnel

HK Electric's cable tunnel

The process of transmitting electricity from the power station to the load centres is termed 'Transmission', while the process for distributing electricity from the load centres to customer buildings is termed 'Distribution'.

HK Electric supplies electricity to Hong Kong and Lamma islands. Electricity is generated at Lamma Power Station and transmitted at very high voltage to various load centres via the transmission system. The network mainly comprises underground and submarine cables. At present, there are only a few overhead lines remaining in the system. In the major load centres where the transmission circuit ends, large capacity transformers are used to step down the voltage before distribution to customer substations.

Electricity is distributed at distribution substations on Hong Kong and Lamma islands. Distribution substations are equipped with remote control and monitoring facilities so that operation of switchgear and auxiliary equipment can be activated remotely from the System Control Centre. The use of underground cables in the transmission system ensures supply reliability even in inclement weather such as typhoon and is ideal for a densely loaded area like Hong Kong. In addition to burying the cables directly underground, cable tunnels have been built to accommodate the fluid-filled cable circuits, protecting our underground cables from adverse weather which in turn enhances our supply reliability.

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