5月13日，工人在张家口市怀来县土木镇一处光伏大棚发电场维护并网线路（无人机拍摄）。近年来，作为国家可再生能源示范区的河北省张家口市，依托京津冀协同发展和2022年北京联合张家口举办冬奥会的契机，加快风电、光伏、光热和生物质发电基地建设。据国网张家口供电公司介绍，截至目前，该地区风电、光伏、光热和生物质等新能源总装机并网容量达1234.7万千瓦，占统调装机容量的72.32%。[新华社 杨世尧 摄]

Aerial photo taken on May 13, 2019 shows workers inspecting a photovoltaic power plant built on barren mountains at Tumu Town of Huailai County in Zhangjiakou City, north China's Hebei Province. In recent years, Zhangjiakou city has vigorously developed and utilized new energy, with installed new-energy capacity surpassing 12 million kilowatts. (Xinhua/Yang Shiyao)