Elon Musk, Tesla, and the Bitcoin Energy Question

Did Tesla actually buy Bitcoin?

Yes. Tesla disclosed a $1.5 billion Bitcoin purchase in the annual report it filed on February 8, 2021, describing the buy as part of a new policy to hold “alternative reserve assets” and calling the position “highly liquid.”^[1] It was the largest, most visible corporate treasury move into Bitcoin since MicroStrategy started buying in 2020, and it pulled the idea of Bitcoin-as-reserve-asset out of the forums and onto the balance sheet of the world's most valuable carmaker. Six weeks later, on March 24, 2021, Tesla went further and began accepting Bitcoin for its cars in the U.S., with Musk promising the coins would be held as Bitcoin rather than swapped for dollars.^[2] For one spring, the most famous company in electric vehicles was also the most famous company in Bitcoin. The same instinct - hard money held as a reserve, not spent - would later be written into Texas law itself, in the state's Strategic Bitcoin Reserve.

Why did Elon Musk stop Tesla from accepting Bitcoin?

Musk suspended Bitcoin car payments on May 12, 2021, and the reason he gave was energy. In a statement posted to what was then Twitter, he wrote that Tesla was “concerned about rapidly increasing use of fossil fuels for Bitcoin mining and transactions, especially coal, which has the worst emissions of any fuel,” adding that crypto “cannot come at great cost to the environment.”^[4] The next day he pressed the point, sharing a chart from the Cambridge Bitcoin Electricity Consumption Index - the cbeci.org tracker run by the Cambridge Centre for Alternative Finance - with a blunt verdict: the energy “usage trend over past few months is insane.”^[13] Bitcoin fell about 12% on the reversal.

Musk left a door open. On June 13, 2021, he said Tesla would take Bitcoin again once there was “confirmation of reasonable (~50%) clean energy usage by miners with positive future trend.”^[5] Five years on, that door has never reopened - Tesla has not resumed Bitcoin payments. But the bar he set, roughly half of mining on clean power, became a number the industry would chase, and on some measures eventually clear.

Why did Tesla sell most of its Bitcoin?

Tesla sold in two stages, and both times it framed the move as cash management rather than a verdict on Bitcoin. The first sale came fast: in the first quarter of 2021 Tesla sold about 10% of its holdings for $272 million, booking a $128 million gain.^[2] Musk said the point was “essentially to prove liquidity of Bitcoin as an alternative to holding cash on balance sheet” - a demonstration, not an exit.^[3] The big one came in the second quarter of 2022, when Tesla converted roughly 75% of its Bitcoin to fiat for $936 million.^[6] On the earnings call, Musk tied it to China: with COVID lockdowns freezing its Shanghai factory, Tesla wanted to “maximize our cash position,” and he stressed the sale “should not be taken as some verdict on bitcoin.”^[9] Tellingly, Tesla sold Bitcoin but kept its Dogecoin. Musk's own crypto tastes run the same way: he has said he personally owns Bitcoin, Ether, and Dogecoin, and that SpaceX, like Tesla, holds Bitcoin too - a soft spot for Dogecoin he has never hidden.^[10]

What is left has barely moved since. As of its mid-2026 filings Tesla still holds 11,509 Bitcoin, bought for $386 million and untouched since 2022.^[7] What changed is only how the coins are counted: starting January 1, 2024 Tesla early-adopted a new fair-value accounting rule and now marks its Bitcoin to market each quarter, a switch that added $589 million to income in 2024 as Bitcoin climbed.^[8] The holding that began as a treasury experiment has settled into something quieter - a position the company neither defends nor sells, just carries.

Was Musk right about Bitcoin's energy use?

He was half right, and then the picture moved under him. In early 2021 a large share of Bitcoin mining did run on coal, much of it in China, and the network's energy use was climbing steeply - the trend Musk called “insane.”^[13] Then came the break he could not have scripted: in mid-2021 China banned Bitcoin mining outright, and more than half the network went looking for a new home. It found one on cheaper, cleaner, and more flexible power, a lot of it in Texas. By the time Cambridge published its 2025 mining study, it estimated that 52.4% of Bitcoin mining ran on sustainable energy - renewables plus nuclear - up from 37.6% in 2022, while coal's share fell from 36.6% to 8.9%.^[12] On Cambridge's numbers the whole network draws about 138 terawatt-hours a year, roughly 0.5% of global electricity.^[12] Musk's own ~50% clean-energy bar had, on that measure, been cleared.

That is the bullish read, and it deserves its skeptics. The energy figures are genuinely contested: independent analysts like Digiconomist's Alex de Vries put Bitcoin's carbon footprint far higher, near 98 million tonnes of CO2 a year, and flag the e-waste from discarded mining rigs.^[15] A 2023 study promoted by United Nations University added a water and land footprint most estimates ignore, on the order of 1.65 cubic kilometers of water across 2020 to 2021.^[16] And the absolute numbers still grew: a greener slice of a much bigger network can still burn more coal in total than a dirty slice of a small one. The honest summary is that Bitcoin's energy story got better on the metric Musk chose and stayed contested on the metrics he did not.

The industry also organized around exactly the argument Musk started. Days after the suspension, on May 24, 2021, Musk and MicroStrategy's Michael Saylor convened the major North American miners to launch the Bitcoin Mining Council, built to standardize energy reporting and press the sustainability case.^[14] Its self-reported numbers should be read as self-reported. The stronger evidence for the “grid asset” case is not a survey but a Texas power bill: in a single month in 2023, Riot's Rockdale mine earned $31.7 million from ERCOT for powering down during a heat wave, more than triple the value of the Bitcoin it mined that month, as told in the history of Bitcoin in Texas. Miners had become a load the grid could switch off - the exact flexibility the next chapter would demand.

The reversal: from critic to the grid's biggest draw

The man who called Bitcoin's energy use “insane” now runs some of the most power-hungry machines ever built. Since 2024 Musk's AI company, xAI, has raced to stand up Colossus, a Memphis supercomputer that scaled to roughly 200,000 GPUs and is backed by about 150 megawatts of Tesla Megapack batteries.^[20][21] Its successor, Colossus 2, is pitched as the first gigawatt-plus AI training cluster, with the campus reaching toward two gigawatts.^[21] Put that against Bitcoin: the entire global Bitcoin network draws on the order of 16 to 20 gigawatts of continuous power.^[11] A single two-gigawatt AI campus, run flat out, would consume around 17.5 terawatt-hours a year - roughly an eighth of what every Bitcoin miner on the planet uses combined, from one site.

This is not one man's quirk; it is the whole industry's turn. The International Energy Agency projects that global data-center electricity use will roughly double to about 950 terawatt-hours by 2030, near 3% of the world's power, with AI the main driver.^[18] In the U.S., the Department of Energy's national lab estimates data centers could reach 6.7% to 12% of national electricity by 2028.^[19] Bitcoin mining, by comparison, was about 0.6% to 2.3% of U.S. power in 2023.^[17] The energy question Musk raised about Bitcoin did not go away - it moved to a bigger machine.

And Colossus brought its own version of the fossil-fuel problem Musk once named. To power the Memphis site fast, xAI installed gas turbines on-site; in 2025 the Southern Environmental Law Center said aerial and thermal imaging showed dozens running - roughly 35 where only 15 were permitted - capable of some 420 megawatts and thousands of tons of smog-forming nitrogen oxides a year, beside the largely Black South Memphis neighborhood of Boxtown.^[23] In April 2026 the NAACP sued xAI under the Clean Air Act over turbines at a second site.^[22] The line Musk once aimed at Bitcoin - that this “cannot come at great cost to the environment” - had found its way to his own front door. There is even a loop in the hardware: the Tesla batteries that once stood for his clean-energy mission now buffer the load of his AI, holding the grid steady while the turbines run.

Where it lands: Texas, the grid, and the compute collision

The argument Musk started is being settled in Texas - and Musk himself is now a Texan. Tesla moved its headquarters to the Austin area in 2021 and, in 2024, shareholders voted to reincorporate the company in Texas outright.^[26][27] The state it moved to is the one place where Bitcoin mining and AI data centers are colliding hardest over the same wires. By late 2025, requests to plug large new loads into the ERCOT grid had swelled to about 226 gigawatts, up nearly fourfold in a single year, roughly three-quarters of it data centers.^[24] That is more than double the all-time peak demand of the entire Texas grid, queued behind one interconnection process.

Texas answered with the discipline Bitcoin miners had volunteered into. Senate Bill 6, signed in June 2025, gave ERCOT the authority to order large loads to curtail or disconnect during grid emergencies - codifying, for AI data centers, the very flexibility miners had offered up years earlier to earn their welcome.^[25][28] The mines themselves are the bridge: across Texas, Bitcoin sites are handing their hard-won grid connections to AI, from Core Scientific's Denton campus turned CoreWeave hub to Cipher's Barber Lake site leased for Google-backed compute, all plotted on the Texas Bitcoin mining map. The infrastructure Musk once faulted for burning power became the on-ramp for the machines burning far more.

That is the arc in one line. Elon Musk spent 2021 warning that Bitcoin used too much energy, and spent the years after building the hungriest computers in the world - on the Texas grid that Bitcoin taught to bend. The critic became the customer.