Group 1 - The core point of the article is the establishment of a joint venture by Shanxi Installation, Shanghai Jingyu, and Shanxi Infrastructure to invest in a BOO project focused on wastewater treatment and environmental upgrades in Shanxi [1] Group 2 - The joint venture agreement was signed on February 3, 2026, with Shanxi Installation contributing RMB 43.8962 million, Shanghai Jingyu contributing RMB 27.9339 million, and Shanxi Infrastructure contributing RMB 7.9811 million, representing 55%, 35%, and 10% of the registered capital respectively [1] - The total investment for the BOO project is estimated at RMB 266.7 million, with the majority of funding expected to come from external financing beyond the equity investments made by the joint venture partners [1] - The construction period for the BOO project is projected to be 15 months, followed by a 20-year operational service period, with terms for cooperation after this period to be renegotiated among the parties involved [1]