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EnerVenue opens a 250 MWh-a-year line for nickel-hydrogen cells rated at 30,000 cycles
EnerVenue has started volume production of its water-based nickel-hydrogen cell, rated for 30,000 cycles, on a line sized for 250 MWh a year. Buyers can now inspect a factory, but they still need a price and warranty terms to weigh it against lithium-ion.
The Product Desk · Product desk
What happened
- California-based EnerVenue has started production at what it calls the world's first high-volume manufacturing line for its water-based Aqueous Metal Cell.
- The first conforming cell came off the new line at the end of September, which the company says was on schedule.
- Phase 1 is rated at 250 MWh of cells a year, and EnerVenue is targeting 1 GWh in 2027 and multi-gigawatt-hour output by 2028.
- The nickel-hydrogen cell is designed for 30,000 charge cycles over thirty years with no scheduled augmentation.
- EnerVenue sells the cell against pumped hydro, flow batteries and compressed air, making its case on the cost of owning the asset over 30 years.
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Why it matters
- constraint Phase 1 output works out to roughly 1,667 of EnerVenue's 150 kWh racks a year, so early buyers share a small allocation until the planned 2027 expansion.
- decision Procurement teams cannot set a lifetime cost beside a lithium-ion bid until EnerVenue publishes pricing, so for now the evaluation covers the factory and the design rating.
- exposure A developer who drops the augmentation reserve on the strength of a design rating carries the fade risk unless the warranty writes that rating in.
A developer modelling a 30-year lithium-ion storage project has to carry a recurring line for new cells. EnerVenue's own comparison says lithium-ion is replaced or augmented every seven to ten years, after 8,000 to 10,000 cycles [14]. Over 30 years that means two rounds of new cells, at years 10 and 20, or four, at years 7, 14, 21 and 28 [6].
EnerVenue's pitch is that its cell takes that line out of the model. The cell uses nickel-hydrogen chemistry, the same chemistry that powered the Hubble Space Telescope and the International Space Station, re-engineered with low-cost materials [4]. "This is the only facility in the world making this high performing water-based nickel-based battery; it's the first battery of its kind that acts like infrastructure rather than a degrading asset," said Henning Rath, EnerVenue's chief executive [3].
What has actually happened so far is a production start. At full automation the line is designed to make about 300 fourth-generation cells a day [2]. The 1 GWh target for 2027 is four times the Phase 1 rating [5]. Every machine on the line was validated first on the company's R&D line six kilometres away [10]. Capacity is added by copying standardised stations, and the 20,000-square-metre building has room set aside for a second phase of the same size [11].
Each cell passes 41 checks at 11 test stations before it ships, covering weld integrity, leak tightness and performance [8]. Racks of 150 kWh are commissioned and tested on site [9]. "Anyone can make one good vessel. The job is making the ten-thousandth one exactly the same," said TJ Hua, EnerVenue's head of production [12].
The two halves of the cycle rating do not quite agree. Spread over 30 years, 30,000 cycles averages about 2.7 a day [1]. The company also describes the life as up to three cycles a day for thirty years [5]. At a steady three a day, the cycles run out after about 27.4 years [2]. Even so, the rating is three to 3.75 times the cycle count EnerVenue gives for lithium-ion [3].
EnerVenue argues on lifetime cost [13], and testing that argument takes a price and a warranty. The release does not include either.
I'd sort candidate projects on two axes. One is project life, measured against the seven-to-ten-year lithium-ion interval [14]. The other is daily cycling, measured against the 2.7-a-day average inside the rating [1]. Skipping augmentation is worth the most on long projects that cycle lightly. On long projects that cycle three times a day, the cell still delivers roughly three times lithium-ion's cycles but reaches its rating a few years before year 30 [2][3]. Short projects are different. A project shorter than seven years, cycled up to three times a day, logs at most about 7,665 cycles, under lithium-ion's 8,000-cycle low end and inside its seven-year interval [7][14]. For that buyer the comparison comes down to upfront price, and EnerVenue has said it does not sell against lithium-ion on the price of a kilowatt hour [13].
What to watch
- A published EnerVenue price per kilowatt hour, or a warranty that commits to 30,000 cycles with no scheduled augmentation.
- Whether the line reaches full automation at about 300 cells a day and the 1 GWh annual rate EnerVenue targets for 2027.
- Named customer projects that model 30 years on these cells with no augmentation reserve.