Hainan Island – China Mainland Line is a 500kV underground line from Hainan Island, Hainan, China, to China Mainland, China.

The project, which is currently under construction, is expected to be commissioned in 2021.


Hainan Island – China Mainland Line is an underground line that will be operated by State Grid Corporation of China. The line will carry alternating current (AC) through single circuit cable.

Approximately $140m was financed by the authorities to undertake the construction works of the project.

The development of the Hainan Island – China Mainland Line project has been approved by the The State Electricity Regulatory Commission.

Hainan Island – China Mainland Line project development status

The construction works on the Hainan Island – China Mainland Line project were commenced in 2019 and commissioning is expected in 2021.

About State Grid Corporation of China

State Grid Corporation of China (SGCC) is a state-owned electric utility. The utility builds and operates power grids, and distributes and transmits electricity. The utility offers energy efficient home appliances air conditioner, fan, TV set, washing machine, microwave oven, refrigerator, electric water heater and computer to save energy. It provides energy conservation, energy audits, energy management, energy saving tips and energy consultation services. SGCC’s projects include Jindongnan Nanyang-Jingmen UHV AC Pilot Project, Xiangjiaba-Shanghai UHV DC Transmission Pilot Project, Qinghai-Tibet Grid Interconnection Project, and others.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.