The system links Mozambique's Songo converter station to the Apollo inverter station near Johannesburg, South Africa, by a 1414-km (879-mile), 530-kV HVDC overhead transmission line. This system experienced a long-term service interruption from 1985 to 1997 because of the Mozambican Civil War.
Interfacing with the Apollo inverter station — Located just outside of Johannesburg, the Apollo inverter station underwent an upgrade from 2006 to 2009. Therefore, the new equipment at the Songo converter station will have to interface with this equipment, which is now already 11 years old.
The Songo converter station project is an ideal case study for the refurbishment of existing HVDC systems to enable the transmission of renewable energy resources. One of the largest issues with accessing renewable energy is the transmission system and distribution network upgrades required. Hatch HVDC Centre of Excellence.
Malaysia has made considerable progress in its 5G network rollout, with Digital Nasional Berhad (DNB) successfully completing 7,114 5G sites across the country, covering 81.7% of populated areas.
However, expansion into other areas, including rural regions, has begun and will continue periodically. “In Kuala Lumpur, 5G coverage in populated areas is at 97.7%, Putrajaya at 97.3%, Selangor at 96.1%, Johor at 83.1%, Melaka at 88.6%, Negeri Sembilan at 77.5%, Penang at 91.1%, and Perak at 79.8%,” she said during Question Time.
The path forward for Malaysia's 5G deployment hinges on critical policy decisions. These include determining whether to maintain a government golden share in DNB, conducting open tenders for remaining coverage areas and indoor solutions, and exploring financing models for rural deployment.
Digital Nasional chief executive officer, Augustus Ralph Marshall, said that the country's first 5G base station installation at Bukit Tunku has been powered on which aims to deliver 500 5G-enabled sites in Kuala Lumpur, Cyberjaya and Putrajaya upon rollout.
2027 master plan – a second 'Set Sail' 5G expansion plan aims for 85% 5G penetration and 75% of network traffic on 5G. The total number of 5G base stations in China reached 4.486 million as of the end of May (2025), according to data released by the country's Ministry of Industry and Information Technology (MIIT).
Mobile operators in China are ramping up 5G and 5G-A rollouts, with the former now at 4.5 million cell sites and the latter in 300 cities; a new 2027 roadmap will see 75% of mobile data in the country on 5G networks. 5G on 5M sites – China has over 4.486 million 5G sites; 5G now comprises more than 35% of total mobile base stations.
China Mobile, the world's largest mobile carrier in terms of subscribers, had previously outlined plans to deploy 340,000 additional 5G base stations in 2025. With these new 5G deployments, China Mobile's total 5G base stations will reach nearly 2.8 million by the end of 2025.
Mobile operators in China are ramping up 5G and 5G-A rollouts, with the former now at 4.5 million cell sites and the latter in 300 cities.
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