China's Shenzhou-21 astronauts have steadily carried out a series of tasks aboard the Tiangong space station over the past week, including in-orbit experiments, equipment maintenance and health monitoring, the China Manned Space Agency (CMSA) said on Sunday.
The crew, comprised of mission commander Zhang Lu and astronauts Wu Fei and Zhang Hongzhang, have spent more than four months in orbit and remain in good health, according to the CMSA.
Inside the station's core module, cherry tomatoes cultivated using a water aeroponic device are thriving. The astronauts documented the plants with photos, harvested ripe fruit and sealed both plants and produce separately for preservation.
Building on the success of the cherry tomato cultivation, the team will conduct aeroponic experiments with wheat, carrots, and both medicinal and edible plants as planned. These trials aim to validate key technologies and expand the range of crops and technical capabilities for space cultivation.
In the field of space materials science, the crew completed several tasks, including cleaning the experimental chamber in the unpressurized compartment, replacing experimental samples, maintaining the electrodes of the central mechanism, and cleaning the window cover of the central mechanism.
They also completed related microgravity combustion science experiments, which included replacing the burner and sampling cover inside the experiment cabinet, as well as vacuumization and exhaust gas discharge.
Additional work included maintenance of the regenerative life support system equipment, microorganism monitoring and assessment and medical training, which helps familiarize the astronauts with the rescue operation methods and force application characteristics in a microgravity environment.
The Shenzhou-21 crewed spacecraft blasted off from the Jiuquan Satellite Launch Center in northwest China on Oct 31, 2025, sending the three astronauts to the orbiting space station on a six-month mission.
Shenzhou-21 crew advances space experiments, equipment maintenance on Tiangong
Shenzhou-21 crew advances space experiments, equipment maintenance on Tiangong
Shenzhou-21 crew advances space experiments, equipment maintenance on Tiangong
China's first 500-kV cross-border alternating-current power interconnection project entered service Monday, creating the highest voltage grid tie between the two countries and advancing Belt and Road energy cooperation.
The project raises two-way power transfer capacity between the two countries from 50,000 kW to 1.5 million kW, enabling the annual transmission of about 3 billion kWh of clean electricity, roughly 30 times the capacity of previous lines, according to China Southern Power Grid.
As the largest cross-border grid project and the highest-voltage power link between China and Laos, it connects southwest China's Yunnan Province with Oudomxay and Luang Namtha provinces in northern Laos.
Cross-border electricity trading began as the project entered operation. About 4.81 million kWh of power from clean energy bases in northern Laos was transmitted to Yunnan through the new line, marking a more regular and institutionalized phase of power connectivity between the two countries.
It is also the first time an overseas new energy project has participated in China's electricity market, the company said. The power involved in the transaction came from a large mountain photovoltaic project in Laos, one of the core supporting power sources for the interconnection line.
"This project is the cross-border power grid project with the highest voltage level between China and Laos. Leveraging the China-Laos power grid interconnection and the power markets in southern China, surplus hydropower from Laos can be transmitted to China during the rainy season, while China can supply supplemental power to northern Laos during the dry season. This project represents yet another landmark achievement between China and Laos in deepening power cooperation and jointly advancing the high-quality development of the Belt and Road Initiative," said Li Jingru, general manager of Electricite du Laos Transmission Company Limited (EDL-T), a joint venture of China Southern Power Grid and Lao state-run Electricite du Laos.
The solar project has an average annual power generation capacity of about 1.65 billion kWh. In 2026, it is expected to transmit about 1.1 billion kWh of solar power across the border, supporting energy complementarity between the two countries.
"In the future, efforts will be made to further promote normalized cross-border electricity trading, meet the trading needs such as electricity transmission from Laos to China's Yunnan, from China's Yunnan to Laos, and from Laos to China's Guangdong, and facilitate the optimal allocation of energy resources in the Lancang-Mekong region," said Li Minhong, marketing director of China Southern Power Grid.
Construction of the interconnection project began in late February last year. Spanning a total length of 177.5 km, the transmission line includes a 145-km Chinese section and a 32.5-km Lao section.
New China-Laos power link expands transfer capacity 30-fold, boosts electricity trading
