Compost Plants

REpow’s Organic Compost Plants are a core component of the integrated biomass implementation framework, designed to convert agricultural residues and livestock manure into certified organic fertilizer while generating early and stable revenues ahead of biomass power plant commissioning.

These facilities play a dual strategic role:

1. Immediate monetization of biomass during the pre-permitting and construction phase of power plants

2. Long-term soil restoration and circular nutrient management, supporting sustainable agriculture and feedstock security

For investors, compost plants represent low-technology, low-regulatory-risk infrastructure assets with predictable operating profiles and strong environmental and social impact.

Role of Compost Plants in the Integrated System

Compost plants are intentionally co-located with Biomass Warehouses and Biomass Power Plants, forming a unified cluster at the district or multi-district level.

Their functions include:

• Processing rice straw, sugarcane leaves, cassava residues, and livestock manure

• Producing organic compost for local agriculture and energy-crop plantations

• Reducing dependence on chemical fertilizers

• Stabilizing farmer income during early project years

• Maintaining feedstock discipline before power plant COD

Once biomass power plants are operational, compost plants shift their primary feedstock from rice straw and sugarcane leaves to cassava rhizomes and other agricultural by-products, ensuring uninterrupted operations.

Technology & Process Concept

REpow compost plants utilize controlled aerobic composting (windrow or aerated static pile), optimized for tropical conditions:

• Mechanical shredding and blending

• Carbon–nitrogen ratio optimization (biomass + manure)

• Controlled aeration and moisture management

• Periodic turning or forced-air systems

• Maturation, screening, and bagging

The process avoids anaerobic conditions, minimizes odor, and complies with organic-agriculture standards.

Standardized Compost Plant Capacities

To enable rapid replication, REpow deploys three standardized compost plant modules, each defined by annual feedstock input capacity.

Building & Structural Standards (Applicable to All Types)

• Foundations: Reinforced concrete with drainage channels

• Flooring: Heavy-duty concrete slab (≥ 200 mm)

• Roof slope: ≥ 10% for tropical rainfall

• Ventilation: Natural + mechanical hybrid

• Fire safety: Zoning, fire breaks, temperature monitoring

• Equipment access: Wheel loaders, windrow turners, trucks

ESG & Regulatory Considerations

• Minimal odor and leachate control

• No hazardous waste generation

• Compatible with agricultural zoning

• Eligible for climate and clean-air funding programs

200KT Compost Plant

Input Feedstock: 

• 200,000 tons/year
  (biomass residues + livestock manure)

Site & Building Specifications

• Total land area: 8–12 hectares

• Processing hall (roofed): 10,000–12,000 m²

• Windrow height: 1.8–2.2 m

• Windrow width: 3.0–3.5 m

Structural Design

• Warehouse type: Open-sided steel structure

• Roofing: Galvanized metal sheet with insulation layer

• Column spacing: 8–10 m

• Steel structure: Hot-dip galvanized structural steel

• Clear height: 8–10 m

Indicative CAPEX

• THB 120–180 million

Investor Profile

• Fast deployment

• Suitable for provincial pilot projects

• Low permitting complexity

500KT Compost Plant

Input Feedstock: 

• 500,000 tons/year

Site & Building Specifications

• Total land area: 20–25 hectares

• Processing hall (roofed): 25,000–30,000 m²

• Windrow height: 2.2–2.5 m

• Windrow width: 3.5–4.0 m

Structural Design

• Warehouse type: Semi-enclosed industrial compost hall

• Roofing: Insulated metal roof with ridge ventilation

• Column spacing: 10–12 m

• Steel structure: Heavy-duty steel truss system

• Clear height: 10–12 m

Indicative CAPEX

• THB 280–400 million

Investor Profile

• Regional-scale deployment

• Strong economies of scale

• Suitable for cluster-based SPVs

Mega Compost Plant

Input Feedstock: 

• 1,000,000 tons/year

Site & Building Specifications

• Total land area: 40–50 hectares

• Processing hall (roofed): 50,000–60,000 m²

• Windrow height: 2.5–3.0 m

• Windrow width: 4.0–4.5 m

Structural Design

• Warehouse type: Fully enclosed industrial compost facility

• Roofing: Insulated sandwich panels with forced ventilation

• Column spacing: 12–15 m

• Steel structure: Industrial-grade long-span steel frames

• Clear height: 12–14 m

Indicative CAPEX

• THB 600–850 million

Investor Profile

• Anchor facility for multi-province programs

• Strong ESG and climate-finance appeal

• Designed for long-term institutional ownership