Staff members of the State Grid in Yuanshi County patrol the rooftop photovoltaic devices at a technology company in Yuanshi County, north China's Hebei Province, May 14, 2025. In recent years, Yuanshi County has encouraged local companies to set up photovoltaic power generation devices on their roofs, aiming to promote the development of green economy and to reduce their management cost. These rooftop devices now boast a combined power generating capacity of 29.49 megawatt connected to the power grid. (Xinhua/Mu Yu)