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, and also operates 1,618 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 1,030 km high-voltage (220, 110 and 66kV), 2,503 km 11kV medium-voltage and 985 km low-voltage cables.
CEM’s network comprises 1,030 km high-voltage (220, 110 and 66kV), 2,503 km 11kV medium-voltage and 985 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.
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

SHERATON 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

OCEAN GARDEN SS

LISBOA PALACE SWS

BRIDGE LANDING POINT SS

HOSPITAL CONDE S. JANUÁRIO SS

THEME PARK SS