Story · Milam County

The Rockdale Story: How a Dying Aluminum Town Became the Bitcoin Mining Capital of North America

For 56 years, Rockdale turned cheap power into aluminum. Then the smelter went quiet — and a decade later, the same wires started turning cheap power into the hardest money ever made.

By TexasBitcoin · Published July 22, 2026 · Updated July 22, 2026

The short answer

Rockdale, Texas became the Bitcoin mining capital of North America because its shuttered Alcoa aluminum smelter left behind the high-voltage power infrastructure industrial mining needs. Bitmain arrived on the old Alcoa land in 2018, Whinstone built the giant next door, and Riot acquired Whinstone in May 2021 for roughly $651 million. Riot's Rockdale facility now has 700 MW of developed capacity — the largest single Bitcoin mine in North America.

Key facts

Alcoa opened its aluminum works near Rockdale, Texas in 1952, and at its zenith the plant employed roughly 1,500 people.^[7]
On September 30, 2008, Alcoa curtailed the Rockdale smelter's remaining ~150,000 metric tons of annual production, citing uncompetitive power supply — laying off about 660 employees on top of roughly 160 cut earlier that year.^[1]
Bitmain launched a 50 MW Bitcoin mining facility on the former Alcoa property on October 21, 2019, with plans to expand beyond 300 MW.^[6]
Riot completed its acquisition of Whinstone US on May 26, 2021, in a deal of $80 million cash plus 11.8 million Riot shares — an implied value of roughly $651 million.^[3]^[4]
Riot's Rockdale facility has 700 MW of developed capacity — the largest single Bitcoin mining facility in North America.^[5]
On October 29, 2021, Alcoa sold the 31,000-acre former Rockdale site for $240 million to a Texas-based real estate group.^[2]

The Rockdale arc: seven decades on one patch of Milam County — aluminum, silence, then hashrate. Timeline is narrative, not to scale; every milestone is sourced in the article below.

Every chapter of the history of Bitcoin in Texas runs through one small town in Milam County. Rockdale is where the industrial era of American Bitcoin mining began — not because anyone planned it that way, but because a dying aluminum town was sitting on the one thing the new industry could not build fast: wires. This is the story of that transfer, era by era, from crucible to hashboard.

What did Alcoa build in Rockdale?

Alcoa — the Aluminum Company of America — opened an aluminum processing plant and its own power generating plant near Rockdale in 1952, and for over half a century the operation was the economic spine of Milam County.^[7] At its zenith, the plant employed roughly 1,500 people, offering some of the best-paying industrial work in central Texas.^[7]

The detail that matters for everything that follows is what an aluminum smelter actually is: a machine for turning enormous amounts of cheap electricity into value. Smelting aluminum is so power-hungry that the metal is sometimes called “congealed electricity,” and Alcoa built Rockdale around that equation — dedicated generation, heavy substations, and high-voltage transmission feeding a single industrial customer. Decades later, a different industry would arrive with exactly the same equation and find the hard part already built.

Why did the Alcoa smelter close in 2008?

Alcoa curtailed the last of Rockdale's smelting on September 30, 2008, citing uncompetitive power supply and collapsing market conditions.^[1] The end came in two blows in a single year: in June 2008 the company idled three of the plant's six potlines — about 120,000 metric tons of annual production — over local power-supply problems, and the September announcement curtailed the remaining ~150,000 metric tons.^[1] About 660 employees were laid off in the final round, on top of roughly 160 impacted earlier in the year.^[1] The plant never restarted; Alcoa permanently closed the site in 2017.^[2]

For Rockdale, the numbers were existential. The closure ultimately erased an estimated 1,700 jobs tied to the Alcoa complex and roughly 30% of Milam County's tax revenue.^[11] Abi Vasquez, who later joined Whinstone as a project administrator, put the decade after plainly: “It was becoming a ghost town.”^[11] What remained on the land was silence — and an industrial-scale electrical system with nothing left to feed.

Why did Bitmain pick Rockdale in 2018?

Bitmain, then the world's dominant maker of Bitcoin mining hardware, chose Rockdale because the smelter's death left behind exactly what industrial mining needs: big substations and high-voltage lines already permitted, built, and idle. In 2018 the Beijing-based company inked a deal with local officials to mine Bitcoin on the vacant Alcoa property, pledging an investment of $500 million.^[8]^[10]

Then came the stumble — and it belongs in the record. When Bitcoin fell roughly 75% from its 2018 highs, Bitmain shelved the Rockdale project in early 2019, and a town that had already been promised one revival watched it stall.^[8] The recovery was as fast as the retreat: once the price turned, Bitmain raced to finish, and on October 21, 2019 it launched a 50 MW mining farm on the former smelter land, with plans to expand past 300 MW.^[6] “Once the price turned around, we ramped up,” said Clint Brown, Bitmain's project manager on the site. “And it was like, ‘hurry up, we need to get this done.’”^[8] At the ribbon-cutting, Rockdale Mayor John King made the town's bet explicit: “There's going to be jobs, there's going to be revenue. We're going to see great things coming in the future.”^[8]

How did Whinstone build North America's largest Bitcoin mine?

Whinstone US built the largest Bitcoin mine in North America by out-building everyone on the same former Alcoa land — a 100-acre campus of warehouse-scale buildings begun while most of the industry was still recovering from the 2018 winter.^[9] The company's co-founder Chad Harris, a Louisiana entrepreneur with no mining background, was blunt about the site selection: “What drove us to Texas was two things. One, A; we needed power.”^[11] By spring 2021 the Whinstone facility had 300 MW of developed capacity, with infrastructure in place to rapidly add 450 MW more.^[3]

That build is what turned Rockdale from an experiment into a capital. Bitmain proved the site could host industrial mining; Whinstone proved it could host the biggest mine on the continent — three buildings, each longer than three football fields, filled with machines doing one job: converting the smelter's old power capacity into hashrate.^[11]

What did Riot pay for Rockdale — and how big is it now?

Riot agreed to acquire Whinstone US on April 8, 2021, for $80 million in cash plus 11.8 million shares of Riot stock — an implied transaction value of approximately $651 million — and closed the deal on May 26, 2021.^[3]^[4] Riot CEO Jason Les called it “the most significant milestone in Riot's history.”^[4] The company then executed the expansion Whinstone had designed, taking the site to 700 MW of developed capacity — the largest single Bitcoin mining facility in North America.^[5]

And Riot is not alone on the old smelter land. Next door sits Bitdeer — the mining company spun off from Bitmain in 2021 — operating the campus where Bitmain first broke ground, at roughly 170 MW.^[10]^[12] One former aluminum site in Milam County now hosts two of the largest Bitcoin mines on the continent; you can see both, alongside every other major Texas site, on the Texas Bitcoin mining map. The site even inherited the smelter's old relationship with the grid, inverted: in August 2023, ERCOT paid Riot $31.7 million in power credits to curtail Rockdale during the Texas heat wave — the mine acting as the grid's shock absorber rather than its burden.^[13]

What does Bitcoin mean for Milam County today?

Bitcoin gave Rockdale its second industrial life. As of November 2021, Whinstone employed about 150 people with more than 200 construction workers on the expansion, and the county's economic development office was fielding two to three calls a week from miners looking for a way in.^[11] The land itself repriced: on October 29, 2021, Alcoa sold the 31,000-acre former Rockdale site — mostly idle since 2008 — for $240 million to a Texas real estate group planning broader redevelopment.^[2] Mayor John King, who had bet on the miners at that 2019 ribbon-cutting, described the change in the town's own terms: “There is a heartbeat.”^[11]

The same wires, the same substations, the same deal with cheap Texas power — first aluminum, now Bitcoin. Rockdale never changed its business model. It changed its product.

The honest counterweight: megawatts aren't headcount

A Bitcoin mine will never employ a town the way a smelter did, and Rockdale knows it. Alcoa's plant employed roughly 1,500 people at its peak; Whinstone employed about 150 in late 2021 while building the largest Bitcoin mine on the continent.^[7]^[11] Data centers are capital-intensive, not labor-intensive — that is the honest trade at the heart of this story, and locals said so from the start. “People are a little skeptical, because nobody really understands how it works,” said Royce Hudson, a 73-year-old former Alcoa worker, at Bitmain's 2019 opening.^[8]

The bullish case doesn't require pretending otherwise. What the mines restored is not the smelter's payroll but its gravity: a tax base, construction waves, an anchor tenant that makes the county legible to every industry that needs power. The frontier question for Milam County's next decade is what compounds around 870-plus megawatts of developed mining capacity — and Rockdale, twice now, has been the town that finds out first.

Frequently asked questions

Why is Rockdale, Texas the Bitcoin mining capital of North America?

Because Alcoa's shuttered aluminum smelter left Rockdale with massive high-voltage power infrastructure and nothing to feed it. Bitmain broke ground on the vacant Alcoa land in 2018, Whinstone built the giant next door, and Riot's 700 MW Rockdale facility is now the largest single Bitcoin mine in North America.

What happened to the Alcoa plant in Rockdale?

Alcoa opened its Rockdale aluminum works in 1952 and curtailed the smelter's last production on September 30, 2008, citing uncompetitive power supply and market conditions. The plant was permanently closed in 2017, and in October 2021 Alcoa sold the 31,000-acre site for $240 million.

Who owns the biggest Bitcoin mine in Rockdale?

Riot Platforms. Riot completed its acquisition of Whinstone US on May 26, 2021, in a deal valued at roughly $651 million — $80 million in cash plus 11.8 million Riot shares — and expanded the site to 700 MW of developed capacity, the largest single Bitcoin mining facility in North America.

Is Bitmain still mining Bitcoin in Rockdale?

The site Bitmain launched in October 2019 is now operated by Bitdeer, the mining company spun off from Bitmain in 2021. Bitdeer's Rockdale campus, roughly 170 MW, runs on the same former Alcoa land — directly beside Riot's 700 MW flagship in Milam County.

How many jobs has Bitcoin mining created in Rockdale?

As of November 2021, Whinstone employed about 150 people at the Rockdale site, with more than 200 construction workers on the expansion. That is real payroll but well below the roughly 1,500 Alcoa employed at its peak — the honest trade of a capital-intensive industry replacing a labor-intensive one.

Sources

Every datable claim above is sourced below. This is a research and reference article, not financial or legal advice.