After the retarget, check both hashprices
One week after the +4.16% difficulty print, USD hashprice can look calm while BTC hashprice already slipped.
Last Friday the useful mining habit was to stress-test power before the difficulty retarget.
The print landed. The habit does not expire.
On Saturday 19 September 2026, Bitcoin difficulty rose +4.16% to 132.76T, up from 127.45T (CoinWarz difficulty history; Hashrate Index weekly board). That is not a vibes event. It is a locked change in how much work the network requires for the same block reward schedule.
One week later, on Friday 25 September, public boards still show difficulty at 132.76T. Hashrate Index's live board puts USD hashprice near $40.16 per PH per day, Bitcoin around $83,600, and network hashrate near 937 EH/s. CoinWarz's same-morning snapshot agrees on difficulty and places the next retarget around 3 October, with early public estimates still swinging as the epoch fills in.
If you only open the USD hashprice tab, the week can look uneventful. That is the trap.
Dollars can cover a haircut that bitcoin still feels
Hashprice is expected miner revenue per unit of hashrate. It has two useful currencies.
USD hashprice answers: can this fleet pay a dollar power bill today?
BTC hashprice answers: how many sats does each petahash earn before you convert anything?
Hashrate Index's 21 September roundup made the split explicit. Over that week, USD hashprice moved from about $39.31 to $40.93 per PH per day (+4.1%). BTC hashprice moved from about 0.000496 to 0.000477 BTC per PH per day (−3.9%). Bitcoin's price rally more than offset the difficulty step in dollars. It did not restore the sats-per-PH that the higher difficulty removed.
So a calm $40 USD print after a +4% difficulty jump is not proof that "nothing happened." It is often proof that price moved enough to hide the print in one unit while the other unit slipped.
Operators who settle power in dollars and think about treasury in bitcoin need both lines on the same morning. One green tab is not a full sheet.
What still clears after the print
Difficulty does not change your electricity contract. Your ASICs still draw the same watts. Cooling still runs. The hosting invoice still arrives.
A simple energy-only check:
Break-even $/kWh ≈ hashprice ÷ (24 × efficiency in J/TH)
At roughly $40.16 / PH / day and 15 J/TH, that lands near $0.11 / kWh before pool fees, downtime, and hardware amortization. Exact cents move with your efficiency tier and the live index. The shape does not: after an upward retarget, marginal iron and expensive grids feel it first.
Hashrate Index's same roundup framed the fleet in energy units: under-14 J/TH operations were earning on the order of ~$136 / MWh that week; 25–38 J/TH fleets closer to ~$51 / MWh. If your contracted power sits near those bands, a locked difficulty step is a go / no-go question for the weakest racks, not a footnote under a green candle.
Forwards are a second check for anyone sizing past this epoch. That roundup had the Luxor forward market pricing an average hashprice near $39 / PH / day over the following six months — below the Friday spot print. Spot pays this week's bill. The curve is a reminder not to treat one calm USD day as a site thesis.
Do not trade the first next-retarget forecast
Early in an epoch, difficulty estimates swing.
Midweek after the print, Hashrate Index estimated roughly −1.8% for the 3 October adjustment and warned that early-epoch predictions are noisy. By Friday 25 September, CoinWarz's public estimate on the same window sat nearer +1.3% toward ~134.5T, with the epoch only about halfway filled depending on the board you watch. Same calendar target. Different interim signals.
The useful response is not to pick a tribe on the forecast. It is to model today's locked difficulty and your real power, then update when the next print actually lands. Estimates are a heads-up. Live defaults are the operating input.
What to do on MiningMap
MiningMap is for the comparison that decides whether a rack stays online after the print:
- Free profitability calculator with live Bitcoin price and network hashrate defaults so daily profit is not stuck on a pre-retarget screenshot.
- Global electricity price map so you can move the power assumption across markets you might actually reach.
- Premium layers (heat maps, ranked locations, alerts, ROI break-even) when you need more than a first pass.
None of that replaces diligence on curtailment, cooling, hosting terms, or your real meter rate. It does replace the false calm of reading only the USD hashprice tab after difficulty already moved.
If you watched the retarget last week, put both hashprices and your real $/kWh on one board this week — then decide which machines and which markets still make sense.
Not financial advice. Public market and power data for context only; difficulty estimates and hashprice move with every block.
Not financial advice. Public market and power data for context only.