CryptoSlate
About 235 exahashes per second of Bitcoin mining capacity, roughly a fifth of total ASIC capacity, is sitting idle according to Luxor's Sept. 8 report. The equipment falls into several buckets: uneconomic machines, deliberately curtailed rigs, units in transit, and hardware under maintenance. Their different reasons for switching off make any rebound in hashrate an ambiguous signal of mining stress.
Why it matters
August brought meaningful relief. Dollar-denominated hashprice climbed 24.4% from $31.63 to $39.33 per petahash per second per day, driven mostly by Bitcoin's own 24.5% rally from $62,889 to $78,312. Even so, less efficient fleets in Luxor's 25-38 J/TH tier generated about $45/MWh on average, still below the $48/MWh network-average electricity cost. That tier crossed into profitability on only 11 days of the month.
The improvement matters for marginal rigs. A machine uneconomic at $31 hashprice can return at $39, while a curtailed unit just needs the seasonal incentive to flip back. Both groups add the same hashrate when they reconnect, but they tell very different stories about miner health.
Market impact
The September 5 difficulty adjustment already moved up 1.31%, and October difficulty has risen every year from 2022 through 2025, averaging roughly 10% across the month. Texas's seasonal 4CP curtailment window closes at the end of September, freeing curtailed rigs to come back online.
If enough of the 235 EH/s dark stockpile reconnects while BTC price stalls, hashprice compresses just as marginal miners are most vulnerable. The revenue recovery that encouraged the restart can shrink the reward available once competitors reconnect. Smoothed hashrate and the next difficulty adjustment will be the first real test of how much of that stockpile actually returns.
Frequently asked questions
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What is hashprice and how did it change in August?
Hashprice measures expected mining revenue per unit of computing power before electricity and other costs. Luxor reports dollar-denominated hashprice rose 24.4% in August, from $31.63 to $39.33 per petahash per second per day.
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How much Bitcoin mining capacity is currently offline?
Luxor's Sept. 8 report estimates about 235 exahashes per second of ASIC capacity is sitting idle, roughly a fifth of the ~1,150 EH/s total. The figure comes from the gap between estimated total capacity and the activity implied by August's average mining difficulty.
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Why is the Texas 4CP window important for miners?
ERCOT's four coincident peaks cover June through September, and the associated transmission charges incentivize miners to curtail during summer. The window closing at the end of September removes that specific reason for offline operation until next summer.
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What happens to mining margins when difficulty rises?
Difficulty retargets every 2,016 blocks to target roughly two weeks of block production. Higher difficulty means each unit of hashrate earns less expected BTC revenue, so a rising difficulty compresses hashprice even if Bitcoin's price stays flat.
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Why would idle mining capacity coming back online be bearish?
Returning rigs add hashrate and trigger further difficulty increases, which compress hashprice. The revenue recovery that encouraged marginal miners to restart shrinks the reward available once their competitors reconnect, turning recovery into a self-limiting margin trap.
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