Bitcoin Difficulty Cut Fails To Save Aging S19 Rigs At 5-Cent Power
Key Summary
Bitcoin mining difficulty is projected to decline by 6.5% around November 13, raising daily hashprice from $31.89 to $34.11 per PH/s/day. Despite the revenue lift, older BITMAIN S19 rigs will still fail to cover electricity expenses at a 5-cent tariff.
Key Bullets
- Hashrate Index reported spot hashprice at $31.89 per PH/s/day alongside a difficulty level of 148.36 trillion on November 9.
- A projected 6.5% difficulty reduction will lift expected daily gross revenue per computing unit to roughly $34.11.
- At an illustrative tariff of 5 cents/kWh, both modeled S19 variants remain unable to cover basic electricity costs.
- BITMAIN S21 units operating at 200 TH/s cross into basic electricity coverage at an 8 cents/kWh power tariff limit.
Difficulty Drop Sparks Hashprice Relief
Bitcoin mining difficulty is projected to decrease by 6.5% around November 13, according to network data published by Hashrate Index. Mining data captured in the November 9 snapshot placed current network difficulty at 148.36 trillion. Spot hashprice stood at $31.89 per petahash per second per day at the time of the data collection.
That expected retargeting calculation relies on dividing the existing hashprice baseline by the remaining difficulty fraction of 0.935. Gross revenue per unit of computing power climbs roughly 7% to about $34.11 per PH/s/day. Actual dollar returns depend entirely on Bitcoin spot pricing, block subsidies, and transaction fees.
Older S19 Hardware Misses Power Target
Older ASIC hardware models continue facing harsh operating margins despite the projected downward difficulty adjustment. BITMAIN S19 model 240-Ca units featuring 95 TH/s and 90 TH/s variants draw a nominal 3,250 watts at 25 degrees Celsius. Continuous operation calculations show electricity-only ceilings moving from 3.88 to 4.15 cents/kWh for the 95 TH/s variant.
At a 5 cents/kWh power rate, both S19 variants fail to cover bare electricity bills. Operating costs exceed gross generation even after factoring in the 6.5% difficulty relief. Pool fees, site cooling, repairs, and hosting overhead remain completely excluded from those calculations.
S21 Units Clear Narrow Power Margins
BITMAIN S21 hardware exhibits better efficiency metrics under identical network assumptions. The S21 specification lists 200 TH/s performance at 3,500 watts under standard thermal testing conditions. The projected difficulty reduction lifts the electricity-only ceiling from 7.59 to 8.12 cents/kWh for continuous operation.
At an illustrative 8 cents/kWh tariff level, the S21 crosses from deficit territory to a narrow positive margin. The machine leaves about 10 cents per day before accounting for site overhead or financing costs. Nameplate specifications can differ from real-world output.
Market Volatility And Mining Economics In The Four-Year Cycle
Today's development follows an established trajectory that began on November 9, 2026, when Bitcoin registered a weekly close at $74,968, slipping 0.7% beneath its 50-week moving average according to Galaxy Research data. During that previous market phase, leveraged traders endured $731.00M in liquidations across consecutive sessions as token valuations swung sharply. Short-term holder supply expanded by 600,000 coins since July, compounding network sensitivity. While miners recently processed 11,255 transactions inside a single block on-chain to test operational capacity, prolonged price fluctuations and shifting leverage continue to squeeze margins for legacy mining hardware trying to clear strict electricity tariffs.
Impact score:2 out of 5 | Narrative Tracker:Layer 1 / Layer 2 Infrastructure
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