#2 How to design a 100% renewable Bitcoin strategy for your business
The Future Runs on Sun and Sats
I’ve always believed that if we’re going to build a Bitcoin treasury that withstands macro shocks, regulatory shifts, and reputational pressures, it’s not enough to accumulate BTC. We must ensure that every satoshi reflects a tangible commitment to sustainability. At Sobtree, we are starting from scratch, but we’re growing fast with a clear conviction: our Bitcoin must always come from clean energy, whether it’s ours in the future or sourced from others who meet that standard. One of our core purposes is to leave the world better than we found it.
This is not theoretical. We are building an operating company in Spain, growing with a clear objective: to scale as much as possible while ensuring every aspect of our Bitcoin-first treasury is aligned with long-term sustainability.
Strategic premise
Mining is the act of converting energy directly into Bitcoin. But if you decide that this energy will always come from renewable sources—solar, wind, hydro—you transform your mining operation into a BTC mint that compounds long-term reputation and economic resilience.
Marathon, one of the world’s largest miners, announced in 2024 that over 60% of its energy comes from PPA contracts tied to solar and wind farms
Greenidge Generation, based in New York, sources a growing share of its electricity from clean energy, and has publicly committed to integrating solar into its physical infrastructure
This trend is not just environmental—it is strategic. As energy markets become more volatile and reputational risk increases for high-consumption industries, clean energy becomes a source of price stability, narrative advantage, and long-term alignment.
How to replicate it
Energy audit
Start with your load. Map how much electricity you’re consuming, hourly, daily, monthly. Without this, you’re flying blind.
Renewable PPAs (Power Purchase Agreements)
In Spain alone, over 6 GW of new PPA contracts were signed in 2024. A 10-year solar PPA might cost you ~60 €/MWh, giving you long-term visibility and independence from short-term spot prices.
Own generation
A 5 MW solar plant in southern Spain can produce ~9 GWh/year. With batteries and smart grid balancing, that’s enough to fully cover a 2 MW mining operation, operating 24/7.
Renewable energy certificates
In Spain and the EU, you can certify every kWh through GO-GOs. These are traceable, tradeable, and essential to prove what you’re actually consuming.
Storage and grid flexibility
Add battery systems or use grid services to handle intermittency. Being able to balance your loads during cloudy days or still nights is key to achieving full coverage.
Green financing
Between European NextGen funds, ESG-focused banks, and local subsidies, renewable projects receive preferential treatment. Use that leverage.
Legal structures
A simple Spanish SL might suffice to start. But holding structures in Malta or elsewhere can help isolate risk, protect treasury assets, and access tax efficiency for international growth.
Numerical example: two real-world scenarios
Let’s assume you operate a 2 MW Bitcoin mining facility 24/7, which consumes ~17.5 GWh per year.
Scenario 1: Conservative setup
Market price for energy: 60 €/MWh = 1.05 M€/year
You install a 5 MW solar plant (produces ~9 GWh/year in Spain)
Solar plant CAPEX: 3 M€; battery CAPEX: 0.3 M€
Remaining 8.5 GWh sourced at market rate = 0.51 M€/year
OPEX of solar + battery = ~0.05 M€/year
Total annual energy cost: ~0.56 M€
Annual savings: ~490,000 €
Payback time: ~6.8 years