EnerVenue starts production at its Changzhou plant

EnerVenue starts mass production in Changzhou on Thursday. The company is American. The research sits in Fremont, California. The first factory that can actually ship cells is in Jiangsu. Chief executive Henning Rath told Reuters the date lining up with the Trump–Xi meeting in Washington is a coincidence. The choice of country is not.

In 2023 EnerVenue said its first plant would be in Kentucky. First phase: $264 million, 450 jobs. A year later it dropped the site. Rath, who joined in April, has said the attempt was a useful lesson and that the technology was not ready. He also made a China factory a condition of taking the job. The battery and the line were both redesigned after Kentucky.

What is turning on this week is not a gigafactory. Rath would not give Reuters an exact build cost. He put it between $20 million and $50 million. The hall is about 95 percent automated. Headcount by the end of the year is about 400. Annual capacity aimed at for this year is 250 megawatt-hours, which the company equates to about 300 cells a day. The step after that is 1 gigawatt-hour by the third quarter of 2027. Government help, he said, was permitting, certification and help finding the site. Not a cheque.

$20–50m

Changzhou plant, Rath’s range

$264m

Kentucky first phase, abandoned

250 MWh

Capacity aimed at this year

1 GWh

Target by the third quarter of 2027

Not a lithium cell

The product is a nickel-hydrogen battery, the aqueous metal-cell line EnerVenue has been developing from chemistry NASA flew on Hubble and the space station. Founder Yi Cui is a Stanford materials professor. This is stationary storage, not a car pack. The cell is a tall metal cylinder, not a pouch. Energy density is not the selling point. Cycle life and the ability to site the thing without a lithium fire case are.

That matters if you specify storage. A 250 megawatt-hour year is a line that has left the lab. It is not a volume you can put under a utility contract and forget. One gigawatt-hour in late 2027 is still a small plant beside a lithium factory measured in tens of gigawatt-hours. Anyone writing EnerVenue into a supply plan this winter is writing a process qualification, not a second source at scale.

Why the first article was proved in Jiangsu

Rath’s reason is the district, not the tariff argument. Changzhou already has the hydraulics, the pneumatics and the automation shops within reach of the dock, and engineers who can change a first-of-kind line without waiting on a purchase order from another continent. He told Reuters that without building in China it would have been very difficult, on the capital the company has, to prove the process at commercial scale. He called China the factory of factories, and a stepping stone.

A floor manager at the plant described the same thing from the buying side. Local suppliers will often build a piece of equipment and wait to be paid until the design is taken. Vendors further away tend to want the money first. Graduate engineers on the site earn about 12,000 yuan a month, about $1,800, which is not a US salary. None of that is a secret. It is why a $264 million Kentucky plan became a $20–50 million line that is already full of tools.

The money behind the line is a private round, not a US grant. In March EnerVenue raised more than $300 million, led by Full Vision Capital, the family office of Hong Kong property heir Peter Lee Ka-kit. Saudi Aramco and SLB are in the round. Rath said the wider group includes Towngas, which is also a customer. The investors and the factory are in the same part of the world.

What a buyer can actually place

The company wants plants of the same type in North America, the Middle East and Europe from 2028. Sites are to be chosen next year. Rath’s line on the United States was direct: EnerVenue wants to sell there, and it depends on the rules. He also said the company is American, with a Chinese footprint.

That footprint is the purchasing question. The 2025 US tax law kept a credit for battery storage and tightened the rules on Chinese content and Chinese ownership. Reuters noted that it is not clear whether a cell made in Changzhou qualifies. A buyer who needs the credit cannot treat “American company” as the answer on the form. The form asks where the cell was made, and who owns the plant. Until a North American line exists, the cell that exists is the Chinese one.

Kentucky is not a fallback. There is no Kentucky factory to switch on if the credit ruling goes the wrong way. The 450 jobs and the $264 million were a plan from 2023, dropped because the product was not ready, and not replaced with a smaller American line. The smaller line was built where the suppliers already were.

The scale is the part a project sheet will get wrong. Two hundred and fifty megawatt-hours is the whole of this year’s aim. A single four-hour system at 100 megawatts is 400 megawatt-hours. The factory’s first year does not cover one project of that size. Three hundred cells a day is a number you can walk. It is not a number you can put in front of a procurement board as firm volume for 2027 and expect the plant to have spare capacity when someone else has already qualified.

There is also no proven sister line to copy from. Kentucky was dropped because the battery was not ready, and the factory was redesigned with the cell. Changzhou is the first article. Yield, scrap, and how long a cylinder actually holds its rating are still this plant’s numbers, not a transferred process. A qualification started this autumn is a qualification of a line in its first weeks, not of a design that has already run a year in another country.

For a specifier the useful split is this. The chemistry is in production from Thursday, at a few hundred cells a day, from a plant that cost a fraction of the American plan and employs about as many people. The next factory, if it is in North America or Europe, is a site decision next year and a start in 2028, and Rath has said the American sale depends on the rules. Until that building exists, the cell you can take is the one from Changzhou. The credit form will ask where it was made. Kentucky will not be the answer, because Kentucky was not built.