Bitcoin's network hashrate has fallen to 804 EH/s as of October 4, 2026, down from a peak above 1,100 EH/s in late 2025 — a decline of roughly 27% over nine months, the longest sustained drop since China's mining ban in 2021. The cause is not regulatory pressure or hardware failure. It is economi...
"You get a lot more money per electron if you're doing it for AI than for Bitcoin mining." — Fred Thiel, CEO, MARA Holdings
Bitcoin's network hashrate has fallen to 804 EH/s as of October 4, 2026, down from a peak above 1,100 EH/s in late 2025 — a decline of roughly 27% over nine months, the longest sustained drop since China's mining ban in 2021. The cause is not regulatory pressure or hardware failure. It is economics. Public Bitcoin miners have signed more than $100 billion in AI and high-performance computing (HPC) contracts, and they are physically unplugging mining rigs to retrofit facilities for artificial intelligence workloads that generate approximately three times the revenue per megawatt.
The shift is structural, not cyclical. CoinShares estimates that mining revenue will fall from 85% of total revenue for listed miners in early 2025 to below 20% by end of 2026 for companies that have secured AI contracts. At least 35 EH/s of mining power from public companies is scheduled to exit the network. The Bitcoin network is losing its industrial base not to competition within mining, but to competition from an entirely different compute market.
This report examines the scale of the AI pivot, the contract economics driving it, the consequences for Bitcoin's security model, and the risks that miners-turned-data-center-operators now face.
By July 2026, Bernstein's deal tracker recorded more than 7.5 GW of AI-related contracts signed by Bitcoin mining companies, equivalent to approximately $150 billion in multi-year commitments. CoinShares' Q2 2026 mining report puts disclosed backlog above $100 billion, supporting roughly $1.1 billion in annualized AI/HPC revenue, with approximately 550 MW actively billing against more than 4 GW contracted.
The revenue composition of listed Bitcoin miners is inverting. Core Scientific's colocation revenue — almost entirely AI workloads — reached $136.7 million in Q2 2026, up from $10.6 million a year earlier. AI colocation now constitutes 83% of Core Scientific's total revenue. Across the sector, CoinShares projects that AI/HPC revenue will represent more than 80% of total revenue for pivoted miners by December 2026.
This is occurring against a backdrop of compressed mining economics. Bitcoin traded at approximately $58,400 at the close of Q2 2026, less than half its October 2025 all-time high. It has since recovered to approximately $84,700 as of October 4, 2026, but CoinShares' analysis indicates the price recovery is unlikely to reverse the AI migration. The structural economics favor AI regardless of Bitcoin's spot price.
The math is straightforward. CoinShares estimates AI hosting generates approximately $1.5 million in profit per megawatt, compared with roughly $500,000 per megawatt from Bitcoin mining — a 3:1 ratio. AI contracts generate operating margins of 80% to 90%, compared with mining margins that frequently turn negative when Bitcoin trades below $70,000.
The cost to produce one Bitcoin at the U.S. industrial average electricity rate of $0.0885/kWh now runs approximately $75,900 before hardware, staffing, or financing costs. Mining profitability requires sub-$0.07/kWh power with current-generation ASICs (15-16 J/TH efficiency). Electricity constitutes 60% to 80% of operating cost.
AI contracts, by contrast, offer fixed-price, long-duration revenue streams. A 15-year lease with an investment-grade counterparty eliminates the commodity price risk inherent in mining. The contracts also command premium valuations: Hut 8's stock surged 30% on the day it announced its first $9.8 billion AI lease.
As Bitfarms CEO Ben Gagnon stated publicly: "We are no longer a Bitcoin company." CleanSpark CEO Matt Schultz disclosed that his company beat Microsoft in bidding for a 100 MW AI data center in Cheyenne, Wyoming, noting miners are "uniquely positioned in that we have the ability to build out and energize data centers very rapidly."
The following table summarizes disclosed AI/HPC contracts among major public Bitcoin miners as of Q3 2026:
| Company | Contract Partner | Capacity (MW) | Contract Value | Duration | |---|---|---|---|---| | Core Scientific | Multiple | 1,100 | $24B+ (potential) | Various | | Hut 8 | Undisclosed (inv.-grade) | 949 (total portfolio) | $26.6B (base term) | 15 years | | IREN | NVIDIA / Microsoft | Multiple sites | $3.4B (NVIDIA) + $9.7B (Microsoft) | 5-15 years | | Cipher Mining | AWS | 300 | $5.5B | 15 years | | TeraWulf | Anthropic | 401 | ~$19B | 20 years | | AMD partner (undisclosed miner) | AMD | 530 | $14B+ | 15 years |
Core Scientific sold approximately $175 million in Bitcoin holdings during Q1 2026 to fund its AI infrastructure buildout. Bitcoin mining is being discontinued.
Hut 8 signed a second $9.8 billion, 15-year lease for Phase II of its Beacon Point campus in Texas, doubling the tenant's footprint to 704 MW and fully commercializing the site's 1 GW power capacity. The campus now has a base-term contract value of $19.6 billion, rising to $50.2 billion if renewal options are exercised. Hut 8 priced $4.25 billion in senior secured notes to finance construction.
IREN signed a 5-year, $3.4 billion AI Cloud contract with NVIDIA and entered a strategic partnership to advance liquid-cooled data centers at its Childress facility in support of its $9.7 billion Microsoft contract.
Hyperscale Data suspended mining operations at its Michigan facility in September 2026 to pursue a potential $1.2 billion AI contract.
The hashrate consequences are measurable. Bitcoin's 30-day mean hashrate fell from 1,108 EH/s in November 2025 to 898 EH/s by mid-2026, and further to 804 EH/s as of October 4, 2026. This represents a 27% decline — the longest sustained drop in Bitcoin's history.
Network difficulty has adjusted downward multiple times in 2026. February saw an 11.16% drop, March a 7.76% drop, and June a 9.91% drop. The most recent adjustment on October 3, 2026, was marginal — a 0.03% decline to 132.72 trillion — suggesting the hashrate may be stabilizing near current levels.
CoinShares estimates at least 35 EH/s of mining power from listed companies will exit the network, representing 4.7% of the roughly 750 EH/s network (at the time of their Q2 report). This is occurring even as the underlying power capacity remains operational — it is simply being redirected to AI workloads.
The decline has a self-correcting mechanism: as hashrate drops, difficulty adjusts downward, making mining more profitable for remaining operators. Bitcoin's difficulty fell year-over-year for only the second time in the network's history, according to Hashrate Index. For miners who remain committed to Bitcoin — particularly those with sub-$0.05/kWh power costs — the reduced competition improves unit economics.
A critical detail in the AI pivot narrative: there is a large gap between contracted capacity and actual revenue generation. CoinShares reports approximately 550 MW actively billing against more than 4 GW contracted — a utilization rate of roughly 14%.
This gap exists because AI-ready data center construction requires 18-36 months for delivery. The cost to build AI-ready facilities has escalated to $8-11 million per megawatt, driven by liquid cooling requirements and transformer shortages. Financing these builds requires billions in capital expenditure. Hut 8's $4.25 billion bond issuance illustrates the scale of capital required.
The contracted backlog is real — counterparties include Microsoft, NVIDIA, AWS, Anthropic, and Google-backed entities — but the revenue will materialize over years, not quarters. In the interim, miners face a period where they have committed power capacity away from mining but are not yet receiving full AI revenue.
The transition carries meaningful risks that the market has not fully priced.
Execution risk. Converting a Bitcoin mining facility to a Tier III or Tier IV AI data center is not trivial. Mining requires air cooling and commodity-grade power distribution. AI inference and training require liquid cooling, redundant power, low-latency networking, and strict SLA compliance. Companies with no prior data center operating experience are entering a market dominated by Equinix, Digital Realty, and hyperscaler-owned facilities.
Concentration risk. A small number of hyperscaler counterparties — Microsoft, AWS, Google, NVIDIA — anchor the vast majority of contracts. Any pullback in AI capital expenditure or a shift toward on-premises compute could leave miners with purpose-built facilities and no tenants.
Capital structure risk. The transition requires billions in debt financing. Hut 8 alone has issued $4.25 billion in senior secured notes. If AI revenue ramps slower than projected, debt service on partially utilized facilities becomes a material concern.
Regulatory risk. At least 225 moratoriums or restrictions on data center development have been recorded across 30 U.S. states, of which 151 remain active, according to Congressional Research Service data. Grid access — once the miners' core competitive advantage — is becoming contested.
Reversal risk. If Bitcoin's price appreciates significantly (as it has done from $58,400 in Q2 to $84,700 in early October), miners who have contractually committed their power capacity to AI cannot easily reverse the switch. The opportunity cost of foregone mining revenue during a bull market is real but difficult to quantify ex ante.
The Bitcoin mining industry is undergoing its most significant structural transformation since the China ban of 2021. The difference is that China's ban was imposed externally. The AI pivot is voluntary — driven by economics that make Bitcoin mining the less attractive use of the same physical infrastructure.
For the Bitcoin network, the implications are manageable in the near term. Difficulty adjustments have historically absorbed hashrate fluctuations, and the current decline — while historically unusual in duration — has not approached levels that would threaten network security. The 804 EH/s hashrate remains orders of magnitude above any plausible attack threshold.
For the mining companies, the pivot represents a high-stakes bet on execution. The contracts are large, the counterparties are creditworthy, and the demand for AI compute is real. But the companies are entering a mature, competitive industry — data center operations — with limited operational track records, significant debt loads, and facilities that were not originally designed for their new purpose.
The sector is no longer defined by its relationship to Bitcoin. It is defined by its access to power.