Proposal: Geodyn Solutions 150 MW Hybrid Sargassum-Algae Biogas Power & Circular Bioeconomy Plant with HRSG + ORC – Puerto Rico
Executive Summary
Geodyn Solutions proposes a 150 MW hybrid biogas power plant in Puerto Rico that utilizes seasonal Sargassum seaweed and year-round cultivated algae to generate renewable baseload electricity through anaerobic digestion, now enhanced with HRSG and Organic Rankine Cycle (ORC) systems for waste heat recovery. This advanced circular bioeconomy facility also produces organic fertilizer and high-protein algae biomass for food and feed, providing Puerto Rico with sustainable power, agricultural inputs, and economic opportunity.
By converting waste heat into additional electricity, the integrated HRSG-ORC system improves plant efficiency, increases total output, and delivers a 12-year ROI of over 300%, making this project a high-performance investment with triple-impact returns.
Project Summary
Parameter | Detail |
Location | Puerto Rico (coastal/industrial zone) |
Project Type | Hybrid Sargassum-Algae Biogas with HRSG + ORC |
Installed Capacity (Biogas CHP) | 150 MW continuous baseload |
Additional Output (ORC) | ~15 MW (from waste heat recovery) |
Total Effective Capacity | ~165 MW |
Feedstock | Sargassum (seasonal) + Cultivated Algae (year-round) |
Additional Products | Organic Fertilizer, Algae Protein (Food/Feed) |
Deployment Timeline | 18–24 months |
Power Sale Rate | $0.19 per kWh |
Biomass & Energy Strategy
- Sargassum Seaweed: Harvested seasonally from Puerto Rico’s coasts, turning an environmental burden into a renewable resource.
- Cultivated Algae: Grown in open ponds on non-arable land using recycled wastewater and industrial CO₂.
- Anaerobic Digestion: Converts biomass into methane-rich biogas.
- CHP Units + HRSG + ORC: Generates power and recovers waste heat for additional electricity output (~10%).
Land Requirements
- Open Pond Algae Cultivation: ~9,000–12,000 acres (36–48 km²) for 70–80% year-round biomass support.
- Sargassum Collection: No land needed—harvested directly from coastal zones.
- Site selected based on access to CO₂ sources, water, transmission, and logistics.
Capital Expenditure (CAPEX)
Component | Cost Estimate (USD) |
Algae Cultivation (Open Ponds) | $120 million |
Anaerobic Digestion Units | $180 million |
CHP Generators & Biogas Engines | $120 million |
Sargassum Collection & Pretreatment | $50 million |
CO₂ Injection + Water Reuse Systems | $30 million |
HRSG + ORC Waste Heat Recovery Systems | $45 million |
Fertilizer Processing Infrastructure | $35 million |
Algae Biomass Drying & Feed Facilities | $45 million |
Grid Interconnection & Substations | $35 million |
Site Development & Civil Works | $35 million |
Contingency (25%) | $175 million |
Total Estimated CAPEX | $870 million |
Operating Expenditure (OPEX)
Category | Annual Cost (USD) |
Labor, Admin, Security | $16 million |
Algae Pond Operations | $18 million |
Sargassum Collection (seasonal) | $9 million |
Equipment Maintenance & Spares | $15 million |
Biomass Processing (fertilizer/feed) | $7 million |
Environmental Compliance & Monitoring | $3 million |
Utilities, Water Management | $4 million |
Insurance, Permits, and Taxes | $4 million |
Total Annual OPEX | $76 million |
Revenue Streams
- Electricity Sales (from CHP + ORC)
- Output: 150 MW CHP + 15 MW ORC = 165 MW
- Annual Generation: 165 MW × 85% capacity × 8,760 hrs = 1,227 GWh
- Revenue: 1.227B kWh × $0.19 = $233.13 million/year
- Organic Fertilizer Sales
- ~300,000 tons/year of digestate
- Revenue: $100/ton = $30 million/year
- Algae-Based Food & Feed Products
- ~15,000 tons/year of dry algae biomass
- Revenue: $2,500/ton = $37.5 million/year
Total Annual Revenue:
$233.13M (Electricity) + $30M (Fertilizer) + $37.5M (Feed) = $300.63 million/year
12-Year Financial Summary
Metric | Value |
Total Revenue (12 Years) | $3.607 billion |
Total OPEX (12 Years) | $912 million |
Total Net Profit | $2.695 billion |
Total CAPEX | $870 million |
12-Year ROI | ~310% |
Payback Period | ~3.7 years |
Carbon Sequestration & Environmental Benefits
Benefit Area | Detail |
CO₂ Sequestration | ~400,000 tons/year via algae & Sargassum |
Coastal Remediation | Sargassum removal improves tourism, water quality |
Emissions Reduction | Replaces fossil diesel, near-zero net CO₂ emissions |
Water Recycling | >90% reuse in algae systems |
Circular Economy | Closes loops in energy, agriculture, and waste |
Job Creation Impact
Category | Estimated Jobs Created |
Construction (2 years) | 800–1,000 |
Plant Operations & Maintenance | 250 |
Algae Cultivation & Processing | 200 |
Sargassum Harvest Teams | 150+ (seasonal/coastal) |
Logistics & Admin Support | 150 |
Total Job Impact | ~1,500+ jobs |
Strategic Benefits for Puerto Rico
- Transforms environmental liabilities (Sargassum) into revenue
- Provides stable, clean baseload energyusing local biomass
- Supports food, energy, and soil security
- Enables eligibility for carbon credits, green bonds, and DOE/USDA grants
- Strengthens Puerto Rico’s leadership in renewable and circular economy solutions
Implementation & Business Model
- Lead Developer/Operator: Geodyn Solutions
- Revenue Model: PPA-based electricity + direct sales of fertilizer and algae feed
- Contingent Fee: 25% success-based development compensation
- Financing: ESG funds, blended finance, green capital markets
- Partnerships: PREPA, wastewater agencies, universities, food/feed buyers
Conclusion
The Geodyn Solutions 150 MW hybrid biogas plant with HRSG + ORC integration delivers maximum energy efficiency, revenue diversification, and sustainability. By producing 1.2 TWh of clean energy annually, recycling Sargassum and algae, and generating high-value agricultural co-products, the project achieves a 12-year ROI over 300% and creates 1,500+ green jobs—establishing Puerto Rico as a model for circular, renewable energy leadership.
Would you like this formatted as a polished PDF proposal, pitch deck, or business case for investors? I can also include visuals for the ORC layout, energy flow, or carbon credit projections.
