Analysis

The corridor's EV question is a cell question, not an assembly question

TXMX Automotive · 2026·6 min read

Whether this corridor wins EV assembly will not be settled by the size of an incentive package. It will be settled by whether there is a cell supply answer within trucking distance. Across North America, there still is not enough of one.

What the share shift actually says

Between 2012 and 2022 the corridor went from 6.2% of North American light-vehicle assembly to 10.2% — the largest gain on the continent. Where that share came from changes the story. Canada nearly halved over the same decade, from 15.9% to 8.4%. The Midwest slipped only modestly, from 39.3% to 36.4%.

The corridor did not displace aging Midwestern capacity. It displaced higher-cost northern capacity — and it did so while the U.S. South was also growing, from 23.0% to 26.4%. The corridor's competitor is the South, not the Midwest. Both are running the same argument: lower operating cost, aggressive state competition, thin union density.

That matters because the nature of the contested projects is changing. The last decade was won on assembly cost. The next one turns on where the cells come from.

The cell arithmetic

North American cell capacity stood at about 55 GWh a year in 2021. Add up everything announced for 2030 and the total reaches roughly 1,000 GWh — an eighteen-fold increase. That is a great deal of construction, and it is happening.

The problem is what comes after. If EVs exceed 80% of light-vehicle sales by 2040, the cells required come to about 1,653 GWh a year. Build everything announced and the shortfall is still roughly 653 GWh — a gap twelve times larger than all of North American capacity in 2021.

There is range in this. A lower EV share shrinks the gap; smaller average packs shrink it further. If demand simply undershoots, the gap can close on its own. But that scenario also shrinks the assembly projects themselves, so it is not the good news it first appears to be.

Cell plants are not sited on incentives. They are sited on power, water and a single parcel measured in hundreds of acres.

Why cells decide assembly

A finished pack is heavy, bulky, regulated as dangerous goods and expensive to move. The pressure to co-locate cell production with assembly is therefore strong — and the sequence runs one way. The cell plant is decided first and assembly follows it. Not the reverse.

A corridor pitch for EV assembly does not close if there is no cell answer inside the radius. Land one cell plant, on the other hand, and a meaningful share of the assembly work follows almost mechanically. Recruitment priority should be decided on that single fact.

This is where the corridor is exposed. One cell plant runs $2–7 billion and 2,000–2,500 jobs. It is decided on firm power, industrial water at volume, and a prepared parcel in the hundreds of acres. Those are precisely the three things the corridor is currently weakest on.

What the corridor is actually short of

The corridor's strengths are not in dispute: logistics, ports, the crossings, renewable generation, a young working-age population. The weaknesses are equally clear and discussed far less: grid firmness, prepared large sites, and high-skilled labour.

On labour the numbers are unambiguous. The high-skilled share of Texas motor-vehicle employment fell from 13.1% in 2012 to 10.7% in 2022 — over a decade when output rose. The jobs added were mostly not high-skilled ones. Science and engineering graduates run at 12 per 1,000 people aged 18–24 in Texas, against a national average of 18.

Against that, programmer employment inside the sector more than doubled, from 4,000 to 9,800. The direction is right. The additional demand implied by 2040 is around 40,000 — four times today's base. That is not a recruiting problem. It is a supply-of-graduates problem, and it has a fifteen-year lead time.

What follows, depending on where you sit

If you are a supplier: committing EV-specific capital before the cell decision in your radius is almost always early. Committing after one has been announced is usually late. The first thing to establish is which cell supply your customer is actually tied to.

If you are an investor: the assumption in a corridor EV case that most deserves testing is the cell supply assumption. It matters more than assembly capacity, labour cost or incentives — and in most decks it is the least examined line in the model.

If you are a public agency: a cell plant is won on prerequisites, not on pitch material. Recruiting for one before power, water and a prepared site have answers is poor value for money. Headquarters and software centres, by contrast, run $20–100 million and $30–80 million respectively, depend least on physical infrastructure, and bring exactly the high-skilled employment the corridor is shortest of. The sequencing argument favours those first.

On the figures: statistics in this piece are drawn from "Texas Mexico Automotive Supercluster: Progress, Prospects and Policies for Future Success", prepared by Macro Foresight for Bexar County, March 2024, and checked against that document rather than secondary coverage. The figures are public record; the analysis, interpretation and recommendations are TXMX Automotive's own. We are not affiliated with Bexar County or the TMASC initiative.