1. General Description of the System
Nebona Spice Mill supplies spices to industry as well as wholesale and retail markets. The spices are filled and packaged at the company’s premises in Munich. A photovoltaic system for self-consumption is installed on the roof. Previously, the building was heated using fossil fuels.
2. Integration of the Bitcoin Mining System
An innovative addition to the heating system is the integration of a Bitcoin mining system with a capacity of up to 20 kW. A Heatcore HS20 with two Whatsminer M63s is used. The system is powered by surplus electricity from the PV system and feeds hot water into the buffer storage tank.
- Increased self-consumption rate: Surplus energy that would otherwise be fed into the grid at low rates is now used to create additional value.
- Reduction of fossil fuels: The water-cooled mining devices reduce costs for fossil fuels and CO₂ charges.
- Bitcoin earnings as a long-term project: There is no need to sell Bitcoin earnings regularly. The focus is on medium- to long-term value appreciation.
In addition to heat generation, Bitcoin mining produces a cashback of 8–15 cents per kWh* used, reducing operating costs. This makes the integration of Bitcoin mining an economically attractive and sustainable option.
3. Energy Management
The mining system is integrated into the energy management system and is primarily activated when surplus electricity is available.
- Surplus electricity can be efficiently used, especially on weekends and during summer.
- The existing heating system remains in place, but heating costs can be reduced. Further replacement of fossil fuels is planned.
This makes the system a cost-efficient method for electric and decarbonized heating, while costs for fossil fuels such as oil and gas are expected to rise significantly in the long term.
4. Collaboration with terahash.energy GmbH
The operator is taking innovative steps with this system and demonstrates how Bitcoin mining can be integrated into a complex energy system. terahash.energy GmbH provided the innovative mining system and supports the combination of cutting-edge technology and sustainable resource use.
Added Value of the Integrated Systems
- Sustainable energy and heat utilization: The combination of PV system, Bitcoin mining, and heat recovery makes the system both environmentally and economically efficient.
- Cashback through mining: Direct cost reduction through cashback of 8–15 cents per kWh used.
- Decarbonized heating method: Reduction of CO₂ emissions through electric heat sources.
- Future-proof technology: As a response to rising oil and gas prices, the system offers an independent and cost-efficient solution for energy and heat supply.
*The Bitcoin cashback of 8–15 cents is based on individual conditions and the average hash price over the past four years. Actual values may vary and are for guidance only, not a guarantee of future returns.
Back to overview“Bitcoin mining is a valuable thermal and financial tool for us. That is why we decided to deliberately integrate this technology into our energy processes. Instead of feeding our surplus solar power into the grid at low rates, we use it flexibly on-site for our mining systems. The resulting higher value creation per kilowatt-hour significantly accelerates the amortization of our PV system compared to traditional grid feed-in.
However, we do not allow the generated heat to go to waste. In collaboration with terahash, we developed a system that directly integrates the waste heat into our hot water and heating processes. Using efficient heat exchangers, the energy is continuously fed into our buffer storage tanks. This noticeably relieves our existing oil heating system and sustainably reduces both fuel consumption and CO₂ emissions.”
Wolfgang Lederer, Managing Director Spice Mill Nebona