Aerial photo taken on June 14, 2020 shows workers examining the photovoltaic power generation facilities at a modern fishery farm in Fengnan District of Tangshan, north China's Hebei Province. The modern fishery farm is designed to raise fish and at the same time, to generate electricity after photovoltaic panels were installed on its surface. (Xinhua/Mu Yu)

Aerial photo taken on June 14, 2020 shows the first phase project of a modern fishery farm in Fengnan District of Tangshan, north China's Hebei Province. The modern fishery farm is designed to raise fish and at the same time, to generate electricity after photovoltaic panels were installed on its surface. (Xinhua/Mu Yu)

Aerial photo taken on June 14, 2020 shows the first phase project of a modern fishery farm in Fengnan District of Tangshan, north China's Hebei Province. The modern fishery farm is designed to raise fish and at the same time, to generate electricity after photovoltaic panels were installed on its surface. (Xinhua/Mu Yu)

Workers examine the photovoltaic power generation facilities at a modern fishery farm in Fengnan District of Tangshan, north China's Hebei Province, June 14, 2020. The modern fishery farm is designed to raise fish and at the same time, to generate electricity after photovoltaic panels were installed on its surface. (Xinhua/Mu Yu)