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Company Profile
Generation
The actual capacity of CEM’s generation consists of two power stations located on the Coloane Island namely Coloane Power Station A (CCA) and Coloane Power Station B (CCB), which are with 271.4 MW and 136.4 MW of installed capacity respectively.
The type of generation technology deployed are the low-speed diesel generator (CCA) and the combined cycle gas turbine (CCB). These two types of generating units make up of 66.6% and 33.4% of total capacity installed and accounted 16% and 84% of total electricity generation in 2023 respectively.
In 2023, Macau’s gross energy consumption was 5,935.5 GWh, of which 435.4 GWh was produced by CEM and 5,500.0 GWh was acquired from external suppliers. The energy breakdowns between CEM generation and energy acquisition were 7% and 93% respectively. The annual growth rate of energy consumption year-on-year was 9.1%, with the highest peak demand reached 1067.7 MW.
Coloane Power Station A
Generator Type | Commercial Operation | Installed Capacity | ||
|
| MW | MVA | |
Steam Turbine | G01 | 1978 | 20.0 | 25.0 |
| G02 | 1978 | 20.0 | 25.0 |
Diesel Fuel-oil | G03 | 1987 | 24.0 | 30.0 |
| G04 | 1988 | 24.0 | 30.0 |
| G05 | 1991 | 38.6 | 48.3 |
| G06 | 1992 | 38.6 | 48.3 |
| G07 | 1995 | 53.1 | 66.4 |
| G08 | 1996 | 53.1 | 66.4 |
| Total | 271.4 | 339.3 | ||
Coloane Power Station B
Generator Type | Commercial Operation | Installed Capacity | ||
MW | MVA | |||
Cycle Combined | GT1 | 2002 | 45.1 | 56.4 |
| GT2 | 2003 | 45.1 | 56.4 |
| ST1 | 2003 | 46.2 | 57.7 |
| Total | 136.4 | 170.5 | ||
New Combined Cycle Gas Turbine Generator
Lower Emissions
| Generator Type | NOx | SOx | CO | CO2 |
| Macau Power Station (CMC) | 13.32 | 5.10 | 0.79 | 809.15 |
| Coloane Power Station Units G03 / G08 | 2.33 | 1.29 | 0.42 | 319.36 |
| New Combined Cycle Gas Turbine (CCGT) | 0.29 | 0.01 | 0.00 | 42.54 |
| Reduction* | -97.8% | -99.8% | -100% | -94.7% |
Unit: g/kWh
*New CCGT vs former Macau Power Station
System Dispatch Center
The System Dispatch Center is located at Porto Exterior Substation, which is responsible for real-time monitoring of the entire power system. Through coordinating the network operations in generation, transmission and distribution by the System Dispatch Center, the optimal performance of the power system is achieved and ensure delivering the safe and reliable electricity supply to customers.
CEM installed the Remote Terminal Units (RTUs) and power communication network in all HV primary substations and MV customer substations. Large amount of real-time data including operational status, alarm and measurement from substations are transmitted to the centralized SCADA/EMS/DA system through the communication network. It is realized for the dispatchers to closely monitor and control the entire power system. When power outage occurs, the dispatchers can identify the fault situation based on the real-time alarms and issue the remote control to restore the power in fast response via the Supervisory Control and Data Acquisition (SCADA) system, thus it minimizes customers’ outage time. The Energy Management System (EMS) can provide the in-depth analysis of state-estimation, contingency analysis, power flow, etc., to assist System Dispatch Center on the right decision making of network operation, as well as the optimization of daily operation in the power system.
In order to continuously improve the stability and reliability of the MV distribution network, besides of the traditional Open Rings using Power Line Carrier (PLC) technology, CEM implemented the Closed Ring Distribution System in 2008 that can automatically determine and quickly isolate the fault location. Additionally, in order to fully realize the smart grid development, CEM continues to enhance the reliability of MV communication.
Considering the System Dispatch Center has been in operation for more than 20 years and its location, office space, auxiliary systems and equipment are no longer adequate to accommodate the current and future needs, CEM is planning to build the New Dispatch Center and the current control center at Porto Exterior Substation will upgrade as the future backup dispatch center. At the same time, SCADA/EMS/ADMS system will be upgraded adopting state of the art technologies to enhance the intelligence of dispatch management.
In order to achieve the corporate vision of “To be a leading energy services provider in Asia”, CEM will continue to strengthen the implementation of smart grid including various advanced technologies like smart metering, EV charging facilities, renewable energy, network automation, cyber security, asset management, smart street lighting, common services tunnel, etc. Also, CEM will proactively accelerate the digital transformation so as to optimize business processes and operational efficiency. It would further improve the reliability of power supply, provide customers with the best solutions and meet the energy demand of the future society.
Transmission & Distribution
CEM’s transmission system operates at 220kV, 110kV and 66kV, while distribution is mainly at 11kV and 400/230 volts. For customer power supply, frequency of 50 hertz and 230 volts single-phase or 400 volts three-phase is used.
Cotai Substation
Substations
CEM has now in operation 27 primary substations and 8 customer high-voltage switching stations, and also operates 1,732 customer substations and 45 customer switching stations.
High voltage cable installation
Lines and Cables
Power network is made up of underground cables. The high voltage network operates at 220kV, 110kV and 66kV. For distribution purpose, high voltage is initially converted to medium voltage (11kV), and further reduced to 400/230 volts low voltage for customer use.
CEM’s network comprises 1,078 km high-voltage (220kV, 110kV and 66kV), 2,729 km 11kV medium-voltage and 1,042 km low-voltage cables.
66kV (65MVA)
110kV (125MVA)
110kV (200MVA)
220kV (350MVA)
Power Station
Substation (SS)
Interconnections with Guangdong Province
The power interconnection between Guangdong and Macau started in 1984 with the transmission of electricity to Macau through 110 kV transmission lines. Since then, the power cooperation between the two places has become increasingly close, and the scale of interconnected electricity has been continuously increasing. The first, second and third interconnections were completed in 2008, 2012 and 2022 respectively, and the Canal dos Patos Substation, Lotus Substation and Pac On Substation were put into operation one after another. Currently, the Guangdong-Macau power grid is linked by eight circuits of 220kV main supply lines and four circuits of 110kV backup lines, forming a transmission network with three 220kV interconnections, namely the ‘North, Central and South’, with a transmission capacity of 1,700 MW to Macau.
Map of the transmission and interconnection network
66kV (65MVA)
110kV (125MVA)
110kV (200MVA)
220kV (350MVA)
Power Station
Substation (SS)