Solar lights work by storing the power of the sun during the day for use at night. Because these systems are small, they don’t require much energy to work and are usually pretty cost-effective.

In Thong Nguyen commune, Tuyen Quang province, two kindergartens in Lang Cang and Lung Ly villages, despite being built in 2018 and 2020, have never been connected to the national power grid. The ...