Core Viewpoint - The successful commissioning of the Hainan Tara 255 MW × 4 hours energy storage project marks a significant milestone for the National Energy Group, enhancing the region's power system flexibility and supporting clean energy development in Qinghai Province [1][3]. Project Overview - The project has a total installed capacity of 255 MW × 4 hours, making it the largest electrochemical energy storage station built and operated by the National Energy Group [3]. - Located in the photovoltaic industrial park of Hainan Tibetan Autonomous Prefecture, the project consists of various storage forms, including string-type, high-voltage direct connection, and centralized storage [3]. - It includes 56 storage units and 2 sets of high-voltage cascading grid-type storage subsystems [3]. Environmental Impact - The project is expected to generate an annual charging capacity of 285,600 MWh and reduce carbon dioxide emissions by approximately 378.14 tons per year [3]. - It will significantly enhance the peak-shaving capability of the regional power system and improve the flexibility of coordinated dispatching among power sources, networks, loads, and storage [3]. Procurement and Bidding - The project includes centralized storage of 205 MW/820 MWh, string-type storage of 25 MW/100 MWh, and high-voltage direct connection storage of 25 MW/100 MWh, connecting to the 35 kV bus of the He Le 1 330 kV gathering station [3]. - The procurement for the centralized storage equipment was completed in 2023, with winning bids from companies such as Sungrow Power Supply, Beijing Haibo Technology, and Shanghai Electric Guoxuan [3][4]. - The procurement for the high-voltage direct connection storage project was awarded to Nanjing Nari Technology, while the string-type storage system procurement is scheduled for 2024 [3][4].