In a monumental leap for grid-scale energy storage, BYD has officially unveiled the HaoHan, a new energy storage system (ESS) that not only seizes the title of world’s largest single-unit battery pack from rival CATL but also effectively doubles the capacity of Tesla’s flagship Megapack. The breakthrough promises to dramatically reduce the cost and physical footprint of storing renewable energy, bringing unprecedented stability to power grids worldwide.
The core of the HaoHan’s achievement lies in its staggering capacity. A single BYD HaoHan unit boasts a massive 14.5 MWh of storage. Even more impressive is its density: a standard 20-foot container can house 10 MWh, a figure that surpasses CATL’s recently launched Tener system and is double the 5 MWh capacity of Tesla’s newest Megapack 3 within the same physical footprint.
This leap is fueled by a series of technological breakthroughs, culminating in a volumetric energy density of 233 kWh per cubic meter. This number is over 50% higher than the current industry average. The key ingredient is BYD’s new blade battery cell, which itself sets a record with a colossal capacity of 2,710 Ah, claiming the title of the world’s largest energy storage cell.
The Ripple Effect: Smaller Footprint, Monumental Savings
The implications of this density are profound for project developers. BYD states that a typical 1 GWh energy storage facility would require half as many HaoHan units compared to previous technologies. Furthermore, the system uses a staggering 76% fewer individual battery cells and needs a third less land to build out. This translates directly into a 22% reduction in overall leveled project costs.
But the most eye-catching figure is the lifetime cost. With a design lifespan exceeding 10,000 full charge-discharge cycles, the HaoHan system achieves a lifetime Levelized Cost of Storage (LCOS) of just $0.014 per kWh—effectively one cent. This is the lowest electricity storage cost ever announced, making grid-scale batteries an economically irresistible partner for solar and wind farms.
The company officially showcased the system's capabilities in a recent announcement, highlighting its potential to redefine infrastructure projects. As BYD Energy Storage shared on LinkedIn, the "new-generation energy storage system HaoHan" is set to become a global benchmark.
Beyond Size: Intelligent Power Management for a Greener Grid
The HaoHan’s value isn’t just in its size but in its intelligence. BYD achieved the low cost through an internally developed blade battery design that minimizes redundant components, improving the cell-to-system volumetric efficiency to a record 52%. Coupled with this hardware is sophisticated software; BYD’s converter can adjust power output on a millisecond level. This makes the HaoHan exceptionally suitable for the delicate task of grid-level renewable energy balancing, instantly absorbing excess power or injecting it back into the grid to smooth out the intermittency of solar and wind.
This capability is something the global energy industry is in dire need of, as utilities worldwide grapple with blackouts and instability caused by an inability to manage the variable output of clean energy sources.
The HaoHan isn’t just a prototype; it’s destined for immediate, large-scale deployment. BYD has confirmed that this very system will be used to construct the world’s largest grid-level energy storage project: a 12.5 GWh behemoth in Saudi Arabia. This project will serve as a real-world testament to the HaoHan’s promise of providing massive, cheap, and reliable clean energy storage, accelerating the global transition away from fossil fuels.
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