Bitcoin Mining: Capturing Surplus and Stranded Energy to Secure the Bitcoin Network
What if energy that would otherwise be flared into the atmosphere, flow without being fully utilised from rivers, or remain untapped from volcanic sources could instead contribute to securing the world’s largest decentralised financial network? Bitcoin mining, often examined for its electricity requirements, increasingly draws on surplus, stranded, and waste energy sources. From oilfield gas flares to hydroelectric installations and geothermal plants, operations are aligning computational demand with available energy supplies. This article explores these approaches using the latest verified data from independent sources such as the Cambridge Digital Assets Programme.
Stranded Gas Solutions: Converting Oilfield Flares into Reliable Power
In oil and gas production, associated natural gas is frequently flared or vented when pipeline infrastructure is unavailable. This practice leads to resource loss and methane emissions, a greenhouse gas with significant short-term warming potential. Bitcoin mining provides a commercial application by powering modular data centres directly at wellheads, turning what would be wasted energy into electricity for mining equipment.
Operators such as Crusoe Energy have installed containerised facilities across the United States that capture flare gas, generate electricity on site, and run mining rigs. Although Crusoe has shifted some focus toward other data centre applications, the model continues through other players. MARA has expanded its flared-gas operations in partnership with NGON, doubling capacity to 50 megawatts across Texas and North Dakota as of late 2025. These projects convert associated gas that lacks transport options into on-site power, often at costs well below grid averages.
The Cambridge Digital Mining Industry Report, published in April 2025 and covering entities representing 48% of global hashrate, estimates that stranded natural gas supplies 507 megawatts of mining capacity. This accounts for 3.3% of the industry’s total energy mix and 8.7% of its natural gas consumption. Generators in these setups achieve up to 99.9% methane destruction efficiency, compared with 91% to 98% for open flaring. Analysts indicate potential reductions in CO₂-equivalent emissions of as much as 63% relative to conventional flaring. These operations transform a regulatory consideration and emission source into productive use while providing miners with low-cost, dispatchable power in remote locations.
Rivers of Reliable Power: Hydropower’s Central Role in Bitcoin Mining
Hydropower continues to be one of the largest single renewable source for Bitcoin mining, accounting for 23.4% of the surveyed energy mix in the Cambridge report. Mining facilities are commonly located near large dams or run-of-river plants, where steady water flow from rivers provides low-cost, almost zero-emission baseload electricity without the intermittency challenges of wind or solar.
Paraguay demonstrates the approach at national scale. The Itaipu Dam on the Paraná River, with an installed capacity of 14,000 megawatts shared with Brazil, together with the Yacyretá Dam and smaller facilities such as Acaray, creates a structural electricity surplus. Domestic consumption is modest relative to generation, leaving substantial capacity available. As of mid-May Paraguay ranks as the fourth-largest Bitcoin mining jurisdiction globally, holding approximately 4.3% of world hashrate, or around 43 exahashes per second, as of the first half of 2026. Mining operations absorb several hundred megawatts of this surplus, particularly during periods of high water availability. Companies such as HIVE Digital have expanded to 400 megawatts of hydroelectric capacity in the country, with further projects under development.
In North America, comparable river-based sites operate near the Niagara River in New York, where existing hydroelectric plants have supported renewed mining activity. Miners function as flexible consumers, increasing usage during high-flow seasons and reducing it when other grid demand rises. This interaction assists with seasonal balancing and helps avoid curtailment of renewable generation, providing a practical complement to grid management without requiring extensive new storage infrastructure.
Volcanic Geothermal: El Salvador’s State-Backed Geothermal Integration
El Salvador has linked Bitcoin mining with its geothermal resources derived from volcanic activity. Since 2021 the government has allocated 1.5 megawatts from the 102-megawatt Tecapa volcano plant, managed by the state entity LaGeo, to dedicated mining operations. By early 2026 the project had generated nearly 474 BTC, with an estimated market value in the region of $29 million to $34 million depending on prevailing prices.
Geothermal energy supplies roughly one-quarter of El Salvador’s national electricity mix. Revenue from mining has supported further capacity development through public-private partnerships such as Volcano Energy. Additional plants are planned near sites including Chinameca, with long-term geothermal potential estimated to exceed 400 megawatts. The constant, weather-independent output from geothermal sources aligns closely with the steady demand profile of mining operations. While the country continues to address grid reliability and household electrification priorities, the initiative shows how baseload renewable energy can pair efficiently with computational loads.
Grid Partners: Bitcoin Miners as Flexible Demand Response Providers
Bitcoin mining equipment can adjust power consumption within seconds, enabling effective participation in electricity markets that must balance variable renewable generation or unexpected outages. In Texas, which hosts 75.4% of surveyed global mining activity, operators engage with the Electric Reliability Council of Texas (ERCOT) through demand-response programmes. They reduce load during peak periods or system stress and receive compensation or credits for supporting overall grid stability.
The Cambridge survey documented 888 gigawatt-hours of curtailment across respondents in 2023. Operators such as Riot Platforms have continued active participation, earning power credits through voluntary reductions and ancillary services in both ERCOT and other markets. This demand flexibility absorbs excess wind and solar generation that might otherwise be curtailed and reduces reliance on costly peaker plants. By responding to real-time price signals and grid instructions, miners serve as a responsive resource that enhances system reliability rather than adding inflexible baseload demand.
Efficiency Gains: Hardware Advances and Off-Grid Approaches
Hardware efficiency has advanced steadily alongside sourcing improvements. The Cambridge report notes year-on-year gains of 24%, bringing industry-wide ASIC efficiency to an estimated 28.2 joules per terahash as of mid-2024. These developments have helped moderate overall electricity consumption growth despite continued network hashrate expansion.
Off-grid configurations, incorporating flared gas, dedicated hydro, and wind installations, represent 8.1% of surveyed capacity and allow operations independent of public grids. Renewable integration extends further, with wind accounting for 15.4% of the surveyed mix, solar 3.2%, and other renewables 0.5%. Power purchase agreements with renewable projects enable miners to support new capacity additions while providing a flexible buyer for intermittent output.
The 2025 Energy Mix: A Data Snapshot
The April 2025 Cambridge Digital Mining Industry Report estimates Bitcoin’s annual electricity consumption at 138 terawatt-hours, equivalent to approximately 0.54% of global electricity use. Sustainable sources, including renewables and nuclear, represented 52.4% of the mix: renewables contributed 42.6% (hydropower 23.4%, wind 15.4%, solar 3.2%, and other 0.5%), while nuclear provided 9.8%. Natural gas supplied 38.2%, coal 8.9%, and oil 0.5%.
Around 70% of surveyed operations reported active steps to address environmental impact, focused primarily on efficiency improvements, and lower-carbon energy sourcing. These patterns arise from the economic incentive to seek the lowest-cost power, which often corresponds with surplus, stranded, or renewable resources.
Recognised Challenges and Downsides
Despite these developments, Bitcoin mining faces ongoing criticisms related to its overall scale and local effects. Annual electricity consumption estimates range from 138 to over 200 terawatt-hours depending on the source and period, equivalent to the usage of entire countries and raising questions about resource allocation in energy-constrained regions. Fossil fuel components in the energy mix, particularly natural gas and coal in certain jurisdictions, contribute to greenhouse gas emissions estimated between 40 and 100 million metric tons of CO₂ annually by various analyses.
Additional concerns include water consumption for cooling (direct and indirect), electronic waste from hardware turnover, noise pollution from cooling fans affecting nearby communities, and potential strain on local grids or increases in electricity prices where flexibility mechanisms are limited. Independent assessments note variability in data and the challenges of measuring a decentralised network accurately.
Real-World Impacts and Practical Considerations
Bitcoin mining consumes electricity but does not produce it. Its contribution lies in monetising energy streams that might otherwise remain underutilised, delivering rapid demand response, and supporting investment in renewable and geothermal projects. Locations near gas flares, river-based hydro plants, or volcanic geothermal fields illustrate practical alignment between computational needs and existing energy availability. In Paraguay, mining absorbs structural surpluses from major dams. In El Salvador, it channels revenue toward geothermal expansion. In oil-producing regions and Texas, it supports emission reduction efforts and grid services.
Independent surveys such as those from Cambridge provide the clearest available overview of these trends, based on primary data from a substantial portion of the industry.
Looking Ahead: Bitcoin Mining’s Place in Evolving Energy Systems
As electricity systems incorporate greater volumes of variable renewables, the flexibility offered by Bitcoin miners represents one practical option for balancing supply and demand. Ongoing hardware efficiency improvements, combined with targeted sourcing of surplus and stranded energy, will continue to shape the network’s energy profile. Objective data from regular research remains essential for tracking these developments. At its foundation, Bitcoin mining converts electricity into network security, with sourcing decisions increasingly reflecting engagement with available energy resources worldwide.
Risk Disclosure
Trading or investing in crypto assets is risky and may result in the loss of capital as the value may fluctuate. VALR (Pty) Ltd is a licensed financial services provider (FSP #53308).
Disclaimer: Views expressed in this article are the personal views of the author and should not form the basis for making investment decisions, nor be construed as a recommendation or advice to engage in investment transactions.
