A new study finds that even with a 30% annual Bitcoin price increase, wind-powered mining operations in Ireland fail to break even if global hashrate keeps rising, highlighting the mounting economic pressure on miners as competition intensifies
Bitcoin's price near $63,600 is now below the lowest level tested in a recent academic model of wind-powered mining, raising new questions about the viability of renewable energy strategies for miners. According to a study published in Energy Economics by researchers at the Technological University of the Shannon, a hypothetical 20-megawatt Bitcoin mine connected to a 100-megawatt Irish wind farm would not recover its investment within six years at current market prices, regardless of how much wind energy is curtailed for mining use.
Renewable Mining Model Under Pressure
The study modeled several scenarios using 2024 hourly market data, examining how much of the wind farm's excess energy-electricity that grid operators otherwise instruct offline-could be profitably absorbed by Bitcoin mining. Even when 25% of the wind farm's output was available for mining, the project failed to achieve payback within six years if Bitcoin's price dropped to €60,000 (about $65,000). At higher price points, such as €100,000 per BTC, the payback period ranged from just over two years to under four, depending on curtailment levels. But as prices fell, only the most favorable scenarios remained viable, and at current market levels, none produced a positive return within the equipment's expected lifespan.
Hashrate Growth Cancels Out Price Gains
The central finding of the research is that Bitcoin price growth alone does not guarantee mining profitability if global hashrate-the total computational power securing the network-rises at a similar pace. The model's sensitivity analysis showed that when both Bitcoin's price and hashrate increase by 30% annually, the project still posts a negative net present value of €10.1 million over six years. Only when Bitcoin's price growth outpaces hashrate growth by a wide margin does the operation become profitable. For example, if Bitcoin compounds at 30% per year while hashrate grows at 15%, the net present value turns positive at €7.7 million. But narrowing that gap quickly erodes returns, and if hashrate keeps pace, even a strong bull market fails to deliver payback.
Market Competition and Alternative Revenue
Current network data underscores the challenge. As of August 10, Hashrate Index reported Bitcoin's seven-day average hashrate at 911 exahashes per second (EH/s), well above the study's static assumption of 780 EH/s. The same data provider put spot hashprice-the daily revenue per unit of hashing power-at $31.73 per petahash, a level described as near or below breakeven for many miners, depending on their costs and hardware. Meanwhile, some mining companies are shifting toward artificial intelligence and high-performance computing contracts, with sector-wide deals reportedly exceeding $70 billion. Riot Platforms, for example, recently signed a 20-year lease for 191 megawatts of capacity with an AI lab, potentially earning more reliable revenue than Bitcoin mining alone.
Equipment, Regulation, and Future Risks
The study's model assumes the use of the latest Antminer S21 Hydro hardware, which operates at 16 joules per terahash. Older models, such as the Antminer S9, were found to be uneconomic under all tested scenarios. The analysis also relies on 2024 Irish electricity prices and a private-wire regulatory framework that has not yet been finalized. Any changes in site location, hardware mix, or power contract terms could materially alter the economics. The upcoming 2028 Bitcoin halving, which will cut block rewards again before the end of the six-year horizon, adds another layer of risk for miners planning long-term investments.
For context, the economic pressures facing miners are not limited to renewable energy projects. MGT Capital, a dormant Bitcoin mining company, recently issued 1.65 billion new shares after reporting no revenue and holding 35 idle mining machines, a move that highlights the risks of dilution and operational uncertainty for investors. More details on this development can be found in EgonCoin's coverage of MGT Capital's capital raise.
As the market for cheap, stranded power becomes more competitive and alternative buyers like AI labs enter the scene, the economics of Bitcoin mining-especially with renewable energy-are increasingly dependent on outpacing global hashrate growth and securing favorable power contracts. Without a sustained advantage in either, even aggressive price rallies may not be enough to keep operations profitable.
According to Hashrate Index, Bitcoin's global hashrate reached a seven-day average of 911 EH/s as of August 10, 2026, while the spot hashprice stood at $31.73 per PH/s/day. These figures suggest that many miners are operating near breakeven, with profitability hinging on both hardware efficiency and access to low-cost power. The upcoming 2028 halving is expected to further reduce block rewards, increasing the pressure on mining economics.
Bitcoin mining profitability is shaped by a complex interplay of token price, network hashrate, equipment efficiency, and energy costs. As more miners deploy advanced hardware and global hashrate rises, each operator's share of block rewards shrinks, making it harder to recover capital expenditures. Renewable energy can lower operational costs, but it does not insulate miners from the effects of network competition or future protocol changes. For U.S. miners and investors, understanding these dynamics is critical when evaluating the long-term sustainability of mining operations, especially as alternative uses for cheap power-such as AI computing-become more attractive to energy providers.
