Companhia de Electricidade de Macau - CEM, S.A. (CEM) is a public utility company with the sole concession to transmit, distribute and sell high, medium and low-voltage electricity in Macau. CEM also owns power generation facilities.
The Macau electricity transmission network is comprised of 26 primary substations, 8 high-voltage (HV) switching substations with a total length of 1,010 kilometers of high-voltage cables ranging from voltage levels of 66 kV, 110 kV and 220 kV. The Guangdong-Macau electricity network consists of two 110 kV interconnection channels and two 220 kV interconnection channels. The two 110 kV interconnection channels were connected to Gongbei Substation and Nanping Substation respectively while the two 220 kV interconnection channels were connected to Zhuhai Substation and Qinyun Substation.
The 11 kV medium-voltage (MV) electricity distribution network is comprised of 1,584 customer substations and 43 customer switching stations (11 kV/400 V) connected by MV cables with a total length of 2,450 kilometers. The low-voltage (LV) distribution network is made up of 977 kilometers of cable, while the street lighting network comprises 578 kilometers of cable and 15,910 streetlights. Almost entire CEM’s power network in both transmission and distribution is comprised of underground cables.