The next Bitcoin halving is projected to occur in early 2028, reducing block rewards from 3.125 BTC to 1.5625 BTC. For miners, this means roughly half the revenue per block unless Bitcoin’s price doubles to compensate. History shows that halvings create intense pressure on inefficient operators while rewarding those who prepare early. The miners who survive—and thrive—are the ones who start optimizing their operations 18 to 24 months in advance.

With the network hashrate currently hovering near 916 EH/s and difficulty at 126.2 trillion, competition for block rewards has never been fiercer. Miners running older-generation hardware or paying above-market electricity rates face an existential deadline. This guide covers the concrete steps every mining operation should take now to remain profitable through the 2028 halving.

Understanding What the 2028 Halving Changes

Every 210,000 blocks—roughly every four years—Bitcoin’s block subsidy is cut in half. The 2024 halving reduced rewards from 6.25 to 3.125 BTC. The 2028 halving will cut them again to 1.5625 BTC. At current prices near $64,000, that means a single block will yield approximately $100,000 in subsidy revenue instead of today’s roughly $200,000.

Transaction fees provide additional income, but they currently account for only 2-5% of total miner revenue during normal periods. Unless on-chain activity surges dramatically (as happened briefly with Ordinals and BRC-20 tokens), the subsidy cut will be the dominant factor.

The key question every miner must answer: Can my operation remain cash-flow positive at half the current block reward?

Step 1: Audit Your Fleet Efficiency

The single most important metric heading into a halving is your fleet’s average efficiency, measured in joules per terahash (J/TH). Here’s how current-generation miners stack up:

• Antminer S23 (223 TH/s): ~11.5 J/TH — best-in-class for air-cooled mining
• Antminer S21 Pro (234 TH/s): ~12.5 J/TH — strong efficiency at scale
• Antminer S21 (195 TH/s): ~14.2 J/TH — solid mid-tier performer
• Whatsminer M60 (186 TH/s): ~17 J/TH — competitive but aging
• Antminer S19 XP (140 TH/s): ~21.5 J/TH — likely unprofitable post-halving at most hosting rates

The general rule: any miner above 20 J/TH will struggle to break even post-halving unless electricity costs are exceptionally low (below $0.04/kWh). Miners between 14-20 J/TH are in a gray zone where hosting rates become the deciding factor. Miners below 14 J/TH should remain profitable at typical U.S. hosting rates.

Action: Catalog every machine in your fleet by model, efficiency, and current hashrate. Identify units above 18 J/TH as candidates for replacement or retirement before 2028.

Step 2: Lock in Competitive Power Rates

Electricity is the largest ongoing expense in mining. After the halving, the difference between $0.075/kWh and $0.08/kWh hosting could determine whether an operation survives or folds.

Consider these post-halving profitability scenarios for an Antminer S21 (195 TH/s, 3,510W) at current BTC price:

• At $0.075/kWh: Monthly power cost ~$136. Estimated post-halving revenue ~$185/month. Margin: +$49/month.
• At $0.065/kWh: Monthly power cost ~$161. Estimated post-halving revenue ~$185/month. Margin: +$24/month.
• At $0.08/kWh: Monthly power cost ~$198. Estimated post-halving revenue ~$185/month. Margin: -$13/month (unprofitable).

These estimates assume constant difficulty and BTC price—both unrealistic, but they illustrate how tight margins become. Securing a long-term hosting contract at competitive rates now is one of the highest-ROI moves a miner can make.

Rax Mining offers hosting starting at $0.075/kWh across facilities in 27 U.S. states, with NatGas-powered infrastructure that provides rate stability even as grid costs fluctuate.

Step 3: Plan Your Hardware Refresh Cycle

New-generation ASICs typically launch 6-12 months before each halving as manufacturers race to capture demand from miners upgrading their fleets. Waiting until the last minute means paying peak prices and facing long lead times.

A smart refresh strategy:

• Now through Q1 2027: Begin selling or repurposing older S19-series and M30-series machines while they still have resale value. The closer to the halving, the steeper the depreciation.
• Q2-Q3 2027: Evaluate next-generation models (likely sub-10 J/TH). Place pre-orders if pricing is favorable and delivery timelines are firm.
• Q4 2027: Complete deployment of new hardware. Allow 30-60 days for burn-in, firmware optimization, and tuning before the halving hits.

Browse current ASIC inventory at Rax Mining to start planning your fleet upgrade path.

Step 4: Optimize Operational Costs Beyond Electricity

Power is the biggest line item, but other costs add up and become critical when margins shrink:

• Cooling efficiency: Facilities with efficient airflow management can reduce total power draw by 5-15%. Immersion cooling, while capital-intensive, can extend the useful life of machines and improve efficiency by 10-20%.
• Firmware optimization: Custom firmware like LuxOS or Braiins can improve efficiency by 5-10% through dynamic frequency adjustment and power capping. This alone can turn a marginally profitable machine into a solid performer.
• Maintenance schedules: Dirty fans, clogged filters, and degraded thermal paste reduce hashrate and increase power consumption. A preventive maintenance program that services each machine every 90 days can maintain peak efficiency.
• Insurance and overhead: Review your coverage annually. Post-halving, every dollar of unnecessary overhead counts.

Step 5: Build a Treasury Strategy

How you handle the BTC you mine matters as much as the mining itself. Three common approaches:

• Full HODL: Convert no BTC to fiat. Only works if you have sufficient cash reserves or alternative income to cover operating expenses for 12+ months. High upside if BTC appreciates post-halving (as it historically has).
• Hybrid: Sell enough BTC monthly to cover operating costs (power, hosting, payroll). Accumulate the rest. This is the most common approach among mid-sized operators.
• Full liquidation: Sell all mined BTC immediately. Lowest risk but also lowest exposure to BTC appreciation. Typically used by operators who view mining as a revenue stream, not an investment thesis.

The right strategy depends on your balance sheet, risk tolerance, and time horizon. Operators with secure hosting contracts at low rates can afford to HODL more aggressively because their breakeven is lower.

Step 6: Consider NatGas-Powered Infrastructure

One of the emerging trends heading into the 2028 cycle is the shift toward NatGas-powered modular data centers (MDUs). These units offer several halving-relevant advantages:

• Fixed power costs: Natural gas pricing is less volatile than grid electricity in many regions, providing more predictable operating expenses.
• Off-grid capability: Deploying at stranded gas sites or wellhead locations can access power at rates well below market.
• Scalability: 1MW containers can be deployed individually or chained together up to 30MW, allowing operators to scale precisely with their capital.
• Speed: Turnkey deployment in as few as 60 days versus 6-12 months for a traditional facility build.

Rax Mining’s NatGas MDU units start at $600,000 for a 1MW container, and the fixed-cost power model insulates operators from the grid-rate spikes that have squeezed margins in past halving cycles.

The Bottom Line: Start Now, Not Later

Every previous halving has caught some operators off guard. The miners who panic-sold at the bottom of the 2022-2023 bear market are the same ones who failed to prepare for the 2024 halving. The pattern repeats because the timeline feels distant until it isn’t.

With the 2028 halving roughly 18-20 months away, the preparation window is open now. Audit your fleet. Lock in hosting rates. Begin your hardware refresh. Build your treasury plan. The miners who do this work now will be the ones still operating profitably when block rewards drop to 1.5625 BTC.

Ready to prepare? Explore Rax Mining hosting options or call (646) 906-8398 to discuss your halving preparation strategy with our team.