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 26 primary substations and 8 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 1,584 customer substations and 43 customer switching stations (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 1,010 km high-voltage (220, 110 and 66kV), 2,450 km 11kV medium-voltage and 977 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 with the 220/110kV “Canal dos Patos” substation, with 1,050 MVA importation capacity. With a second 220kV interconnection with GPG completed in June 2012, consisting of 2 circuits connected with the 220/110kV “Lotus” substation, the importation capacity was increased to 1,750 MVA. The 3rd interconnection circuit connected with “Lotus” substation was commissioned in August 2015, the importation capacity increased to 2,100 MVA.