in china Connected Feeding the grid is a giant battery complex with a capacity of 1 GW, 4 GWh, using lithium iron phosphate (LFP) cells and the grid to stabilize the inverters. Successfully connected to the power system for the first time. The world has never seen a storage facility of this scale, capable of creating reference frequencies and voltages that allow the station to act like a power bank for the grid, able to kick in even after an incident.
Image source: Dongsu
Dongsu Station is located near Mandu Latu, Sunitzuo Banner County, Inner Mongolia Autonomous Region. The first connection and synchronization of the power system took place on August 3, 2026.
The power station has a power capacity of 1 GW and an energy reserve of 4 GW hours, which means that when operating at rated power, the battery can theoretically provide energy for 4 hours. The investor is Wanbang Digital Energy: the cost of the project is estimated to be approximately 3 billion yuan, or approximately US$445 million. The complex covers an area of approximately 28 hectares. Around 1 TWh of electricity is expected to be released each year through the drive – which will charge during periods of excess renewable energy generation and release energy during periods of peak demand.
The main feature of the DongSu drive is not so much the battery size but the grid-forming technology. Traditional grid inverters operate based on the frequency and voltage already present in the power system. Grid-connected inverters are able to create their own voltage and frequency reference parameters and respond quickly to power imbalances. Thanks to this, batteries can participate in frequency and voltage regulation, improving the stability of power systems dominated by solar and wind power plants. In principle, such converters could also be used to start up the power system after a major fault without having to connect an external power supply.
Such opportunities are particularly important for the Inner Mongolia region because of the rapid construction of large-scale wind and solar power plants, whose power constantly changes with changing weather. The new storage facility will therefore be able to combine four-hour energy redistribution with rapid grid stabilization, partially replacing the stabilizing role of conventional synchronous generators.
The launch of the complex coincides with China’s new energy policy: the Renewable Energy Development Plan 2026-2030 provides for a wider introduction of such equipment, more accurate generation forecasts and the coordination of power plants and storage equipment. By the end of 2025, China has put into operation 136GW/351GWh of new energy storage devices, of which lithium-ion systems account for 96.1%.
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