Located in Huaneng Nantong Power Plant, Nantong, Jiangsu, this key environmental‑protection renovation project for thermal‑power ultra‑low‑emission consists of east and west coal yards adopting large‑span bolt‑ball arched space grid structure. The east coal yard measures 296 m × 96 m and the west coal yard 291 m × 100 m with maximum height of 45 m. Full‑enclosure of coal stockyard restrains coal dust pollution at source. Special anti‑wind and anti‑corrosion design is adopted for coastal strong‑wind and high‑humidity environment. We completed grid secondary‑detailing, fabrication, anti‑corrosion coating and on‑site erection for grid and enclosure systems to support green upgrading of power plant.