CEM - Companhia de Electricidade de Macau

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Transmission & Distribution

CEM’s transmission system operates at 220kV, 110kV and 66kV, while distribution is mainly at 11kV and 400/230 volts. The supply is 50 hertz alternating current, at 230 volts single-phase or 400 volts three-phase.

Substations

CEM has now in operation 23 primary substations and 7 customer high-voltage switching stations with a total installed capacity of 1,800 MVA in 220/110kV, 1,750 MVA in 110/66kV, 120 MVA in 110/22kV, 100 MVA in 110/11kV and 1,792 MVA in 66/11kV, and also operates 1,480 customer substations (11/0.4kV).

Cotai Substation

Ilha Verde Substation

Lines and Cables

Power network is made up of underground cables. The main high voltage network operates at 66kV, although some circuits operate at 110kV and 220kV. For distribution purpose, high voltage is initially converted to medium voltage (11kV), and further reduced to 400/230 volts for customer use.
CEM’s network comprises 299 km high-voltage (220, 110 and 66kV), 718 km 11kV medium-voltage and 854 km low-voltage cables.

High voltage cable installation

Interconnections with Guangdong Province

The first 220kV interconnection with Guangdong Power Grid (GPG) has been commissioned since June 2008, consisting of 3 circuits connected at a 220/110kV substation “Canal dos Patos,” with importation capacity 1,050 MVA. With the second 220kV interconnection with GPG completed in June 2012, consisting of 2 circuits connected with another 220/110kV substation “Lotus,” the importation capacity has increased to 1,750 MVA.