X-energy's fuel plant feeds 11 reactors. Its order book runs to 144.

A 50-year first, sold into a falling tape

TRISO-X topped out TX-1 on 24 September↗: vertical construction finished on the 214,000-square-foot fuel factory in Oak Ridge, Tennessee, the first commercial-scale advanced nuclear fuel plant raised in the United States in more than half a century ¹². The market shrugged. XE slid 3.6% to $15.78 that day ¹ and closed 25 September at $15.08, 59% below its 52-week high of $37.10 ³.

Eleven reactors of fuel, 144 reactors of promises

At full run, TX-1 is designed to press about 700,000 TRISO pebbles a year from roughly five tonnes of uranium↗, fuel for up to 11 Xe-100 reactors ²⁴. The commitments X-energy has filed with Dow, Amazon and Centrica↗ call for as many as 144 of them, an 11.5 GW pipeline ⁵⁶. One fuel line serves less than 8% of the order book built on top of it.

The second plant is land and a license, not a budget

The company's answer is TX-2, a larger second plant meant to significantly expand capacity ⁴. Its 40-year NRC license already covers both factories ⁴. TRISO-X bought 70 more acres in August, lifting the Oak Ridge campus from 125 to roughly 180 acres↗, and took an $11 million Tennessee grant toward the planned second facility ⁷⁸.

Neither a cost nor a completion date is attached; TX-2 exists today as acreage and a state award. The August Centrus agreement for enriched uranium likewise covers only a portion of the initial fuel needs of the 11.5 GW pipeline ⁶.

Washington is the paying customer so far

The Department of Energy has put more than $2 billion into the demonstration across two 50-50 cost-share tranches↗, and had reimbursed about $546 million by 30 June ⁵. The last public estimate for the whole effort, $4.75 billion to $5.75 billion, dates to early 2023 ⁵. Chief executive J. Clay Sell told investors on 13 August that if more dollars are required, "they will be provided by our partners at the Department of Energy and Commerce" ⁵.

The company's own cash engine is thin against that bill. Second-quarter revenue was $54.6 million, up 154% year over year, on a $0.15 per-share loss; cash on hand was $1.64 billion ³⁹.

Two camps on a $15 stock

Buyers keep showing up. State Street opened a 464,138-share stake worth about $8.5 million in the second quarter, and BlueCrest added $7.4 million ⁹. The bear case has a name and a number: Piper Sandler started XE at underweight on 9 September with a $9 target↗, against Guggenheim's $57 and a $34.25 average ⁹¹⁰. Its analyst Dimple Gosai argues X-energy's asset-light approach "leaves customers carrying more of the technology and project risk" ¹¹.

The builder leaves

Days after the plant topped out, the man who ran it announced his exit. Joel Duling, four decades in nuclear operations, retires as TRISO-X president on 20 November↗, staying on part-time as an advisor to the CEO while an interim chief takes his chair ¹². No permanent successor has been named ¹².

The test is TX-2's budget line

The reactor construction permit is expected in early 2027, TX-1 opens in the first half of 2028, and Dow's final investment decision lands in 2028 at the earliest ⁵; the UK design review for Centrica's 6 GW runs about three years↗ ¹³. The tell is TX-2: a budget line for the second fuel plant before Dow signs would mean the 144 are more than paper. A reactor order without fuel is a wish.