Group 1 - The State Intellectual Property Office of China shows that China Electric Power Construction Group Central South Survey and Design Institute Co., Ltd. and China Electric Power Construction Environmental Protection Technology Co., Ltd. have applied for a patent titled "12665. An Energy-saving System and Operating Method for Sewage Blowers," with publication number CN119797573A and application date of January 2025 [1] - The patent describes an energy-saving system for sewage blowers that includes a biochemical pool and a blower, which connects the blower's outlet to the bottom of the biochemical pool, along with a gas storage water pool equipped with aeration devices [1] - The invention utilizes the residual airflow from the blower to prepare oxygen-rich aqueous solutions stored in the gas storage water pool, which are later introduced into the biochemical pool for oxygen supply, effectively reducing the total air supply demand of the blower and thus lowering energy consumption [1] Group 2 - China Electric Power Construction Group Central South Survey and Design Institute Co., Ltd. was established in 1994, located in Changsha, with a registered capital of 135 million RMB, and has invested in 88 companies and participated in 5,000 bidding projects [2] - China Electric Power Construction Environmental Protection Technology Co., Ltd. was established in 2014, also located in Changsha, with a registered capital of 10 million RMB, having invested in 1 company and participated in 404 bidding projects [2] - The Central South Survey and Design Institute holds 1,932 patent records and 53 trademark records, while the Environmental Protection Technology Company has 118 patent records and 1 trademark record [2]