Operation

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 30 primary substations with a total installed capacity of 1,600 MVA in 220/110kV, 2,320 MVA in 110/66kV, and 2,062 MVA in 66/11kV, and also operates 1,385 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.
As of December 2015, CEM’s network comprises 291 km high-voltage (220, 110 and 66kV), 681 km 11kV medium-voltage and 814 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.

Map of the transmission and interconnection network

MACAU NORTE-B SS
MACAU NORTE-A SS
ILHA VERDE SS
AREIA PRETA SS
DONA MARIA SS
SAO PAULO SS
PORTO EXTERIOR SS
LISBOA SS
NAPE SS
PENHA SS
TAIPA SS
CIRS INCINERATION PLANT SS
NOVA TAIPA SS
CITY OF DREAMS SWS & SS
VENETIAN SS
SHERATION SWS & SS
COTAI SS
COLOANE SS
KAO-HOU SS
CONCORDIA SS
CANAL DOS PATOS SS
NOVA TAIPA SS
COTAI SS
LOTUS SS
COLOANE-B SS
NOVA TAIPA SS
GALAXY SWS & SS
PARISIAN SWS & SS
STUDIO CITY SWS & SS
LOTUS SS
UNIVERSITY OF MACAU SS
WYNN COTAI SWS & SS
DEPOT SS
CANAL DOS PATOS SS
LOTUS SS
MACAU NORTE-B SS
MACAU NORTE-A SS
ILHA VERDE SS
AREIA PRETA SS
DONA MARIA SS
SAO PAULO SS
PORTO EXTERIOR SS
LISBOA SS
NAPE SS
PENHA SS
TAIPA SS
CIRS INCINERATION PLANT SS
NOVA TAIPA SS
CITY OF DREAMS SWS & SS
VENETIAN SS
SHERATION SWS & SS
COLOANE SS
KAO-HOU SS
CONCORDIA SS
WYNN COTAI SWS & SS
DEPOT SS
COTAI SS
COLOANE-B SS
GALAXY SWS & SS
PARISIAN SWS & SS
STUDIO CITY SWS & SS
LOTUS SS
UNIVERSITY OF MACAU SS
CANAL DOS PATOS SS
COLOANE POWER PLANT B
COLOANE POWER PLANT A