Electricity sector in Hong Kong ranges from generation, transmission, distribution and sales of electricity covering Hong Kong. There are two main providers of electricity in Hong Kong.
Companies
Power generation in Hong Kong is managed by two major companies under a Scheme of Control arrangement with the Hong Kong Government. These companies effectively operate in a regulated market.
In 2012, Hong Kong relied on coal, nuclear, natural gas and a very small amount of renewable energy for its electricity generation. As coal-firing generation units start to retire in 2017, the Government plans to raise the share of natural gas to 50% in 2020 while maintaining the share of nuclear power at present levels.
Power stations in Hong Kong
Hong Kong has currently 5 power stations, supplying 77% of its electricity needs in 2012. ;Black Point Power Station Commissioned in 1996, the Black Point Power Station is a gas-fired power station located in Yung Long, Tuen Mun in the New Territories. It is the largest gas-fired power station in Hong Kong with an installed generation capacity of 2,500MW. ;Castle Peak Power Station Commissioned in 1982, the Castle Peak Power Station is a coal-fired power station located Tap Shek Kok, Tuen Mun in the New Territories. It is the largest power station in Hong Kong with an installed generation capacity of 4,108MW. ;Lamma Power Station Commissioned in 1982, the Lamma Power Station is a coal-fired power station located on Po Lo Tsui, Lamma Island in Islands District. It is the second largest power station in Hong Kong at an installed generation capacity of 3,237 MW. ;Lamma Winds Power Station Commissioned in 2006, the Lamma Winds Power Station is a wind turbine located on Lamma Island in Islands District. It is the only industrial-sized wind turbine in Hong Kong with an installed generation capacity of 800kW. ;Penny's Bay Power Station Commissioned in 1992, the Penny's Bay Power Station is a diesel-fired gas turbine power station located at Penny's Bay on Lantau Island. It is peaking power station with an installed generation capacity of 300MW.
Interconnection with China
Hong Kong electrical grid is interconnected with the China Southern Power Grid of Mainland China. Hong Kong imports 23% of its total electricity needs from generating facilities with CLP's equity situated in the mainland. These include a contractual agreement of 70% electricity output from the 2 x 944 MW Daya Bay Nuclear Power Plant and some peaking power/pumping load from Guangzhou Pumped Storage Power Station in Conghua. Recently, CLP said that it would buy 10% more nuclear power from Daya Bay Plant, increasing the share to 80% of the plant's output capacity. But with the increasing electricity demand in southern China, it will be difficult for CLP to acquire 100% of the plant's output capacity.
Transmission
HEC transmits electricity on Hong Kong Island at 275 kV and 132 kV voltage level to various load centres, in which the network consists mainly of underground and submarine cable. The network is owned and operated by HEC. There are only few remaining 132 kV overhead lines in the system. The use of underground cable was chosen because it is ideal for a densely populated area like Hong Kong, and to ensure supply reliability even in bad weather, such as during typhoon. There are also six dedicated cable tunnels to accommodate some of the 275 kV fluid-filled cable circuits in Hong Kong Island and Lamma Island. In most of the load centres, the voltage is being stepped down to 22 kV or 11 kV for distribution purpose. CLP transmits electricity in Kowloon and New Territories at 400 kV and 132 kV voltage level. These transmission networks consist mainly of overhead lines. The network is owned and operated by CLP Power. In most of the load centres, the voltage is stepped down to 11 kV for distribution. Transmission networks of CLP Power and HEC are interconnected by three 132 kV submarine circuits from Hung Hom to North Point for emergency support but no economy power interchange is normally scheduled. CLP's 400 kV transmission network is also interconnected with the 500 kV China Southern Power Grid in Guangdong Province.
Distribution
Electricity is distributed at 22 kV and 11 kV voltage level to over 3,800 distribution substations on HEC side. CLP distributes power mainly at 11 kV level. Voltage is further stepped down to 380 V three-phase or 220 Vsingle-phase and supplied through low voltage cables to customers.
Control center
The system control centre located at Ap Lei Chau monitors and controls all of the switching in HEC's distribution substations remotely. CLP has its system control centre in Tai Po district.
Consumption
In 2013, 153362TJ of electricity was consumed, accounting for 54% of total energy consumption in Hong Kong. Electricity usage based on industry in Hong Kong are 66%, 26%, 6% and 2%.
