Public Miners Shed 21% of Bitcoin Hashrate as AI Revenue Accelerates

The offsets are no longer keeping up

Using an expanded cohort and updated network series, TheEnergyMag estimates that the public miners tracked for this analysis produced a combined realized hashrate of 368.3 EH/s in Q4 2025, 344.4 EH/s in Q1 2026 and 319.0 EH/s in Q2.

That represents a 13.4% decline in six months.

The Bitcoin network’s quarterly average fell from 1,071 EH/s to 993 EH/s and then to 957 EH/s over the same period, a 10.6% reduction. The public company cohort therefore contracted faster than the network.

In Q1, expansion by a handful of miners largely obscured the scale of the shutdowns elsewhere. By Q2, even those additions were no longer sufficient to keep the cohort stable.

Bitdeer remained the largest offset. Its realized hashrate increased 44% from Q4 to Q2, reaching 63.0 EH/s. Excluding Bitdeer, the rest of the cohort’s realized hashrate fell 21.2%, from 324.6 EH/s to 255.9 EH/s.

Bitdeer’s expansion comes from its own SEALMINER production pipeline. By June, the company reported 73 EH/s of self-mining capacity and 15.9 EH/s of co-mining capacity. It produced 990 bitcoin during the month, 388% more than a year earlier.

MARA and American Bitcoin also continued expanding, but their additions were not enough to counter reductions across Cango (NYSE: CANG), Cipher, Keel, Core Scientific, TeraWulf and IREN.

Cango provides the sharpest example of how quickly mining economics have changed.

The company entered bitcoin mining in late 2024 and reached 50 EH/s of deployed capacity during 2025, only to begin decommissioning inefficient machines, leasing out hashrate and moving capacity toward lower-cost regions.

Its realized hashrate fell from 44.8 EH/s in Q4 2025 to 31.3 EH/s in Q1. TheEnergyMag estimates its Q2 capacity would decline to 16.5 EH/s—a 63% reduction in six months.

Keel Infrastructure has taken the transition further. During Q2, it completed the decommissioning of all U.S. bitcoin mining operations in preparation for data center construction. Mining continues in Canada during the phased transition. Meanwhile, the replacement revenue has not yet arrived.

The post-China arms race unwinds

The longer-term context also looks more striking after Q2.

China’s 2021 mining ban briefly removed roughly half the Bitcoin network’s computing power. Hashrate bottomed at 57.5 EH/s in June 2021, but miners relocated and the network had almost fully recovered by December. The United States emerged as the largest mining hub.

That recovery helped trigger the institutional expansion race TheEnergyMag has tracked over the ensuing years. Public miners raised capital, acquired power sites and ordered successive generations of ASICs, eventually pushing the network beyond one zettahash per second.

Only one halving has occurred since that expansion began.

Now, machines and electrical infrastructure accumulated during the post-China race are being idled, impaired or depreciated faster so their power can be reassigned to GPUs. The industry collectively expanded at enormous cost, only for some of its most visible operators to begin dismantling that capacity after one halving cycle.

Unlike the China ban, the current contraction has no single headline trigger. It is a combination of weak mining economics and a competing use for capital and electricity.