1. What is this item?

A biogas-based power generation system uses biogas—methane-rich gas produced from the anaerobic digestion of organic farm wastes (animal manure, crop residues, kitchen waste)—to run a gas engine or turbine that generates electricity. The system typically includes a digester, gas storage, clean-up unit, and a generator set, enabling farms to convert waste into reliable, renewable energy.

2. How is the Quantity Estimated?

• Organic Feedstock Availability: Estimate daily quantity of manure, crop residues, or organic waste (in tons/day).

• Biogas Yield: Typical yields are 20–40 m³ of biogas per ton of wet feedstock.

• Energy Demand: Calculate farm’s daily power requirement (kWh/day).

• Sizing the Digester: Digester volume (m³) is designed to retain feedstock for 30–40 days of retention time.

• Generator Capacity: Match biogas production to generator size—e.g., a 50 kW engine typically needs 100–150 m³ of biogas per day.

3. What are the Cost Components?

• Anaerobic Digester: Tank or chamber for digestion (plastic, steel, or masonry)

• Gas Storage: Flexible gas holders or fixed gasometers

• Gas Clean-up: Filters to remove H₂S, water vapor, and particulates

• Biogas Engine/Generator Set: Gas-engine coupled to an alternator

• Piping & Controls: Gas lines, pressure regulators, safety valves

• Feedstock Handling: Pumps or conveyors to load slurry; slurry outlet for digestate

• Electrical Switchgear: Transfer switch, panel, wiring to farm grid

• Foundation & Civil Works: Base for digester and generator

• Installation & Commissioning: Civil, mechanical, and electrical labor

• Operation & Maintenance: Slurry management, engine servicing, gas filter replacements

4. What are the Going Rates & Per Unit Cost?

• Digester + Gas Holder: ₹15,000–₹25,000 per m³ of digester volume

• Biogas Engine-Generator (10–100 kW range): ₹25,000–₹40,000 per kW installed

• Gas Clean-up Unit: ₹50,000–₹1,00,000 total depending on capacity

• Piping & Controls: ₹200–₹400 per meter of gas piping; ₹1–₹2 lakh for complete control panel

• Civil Works: ₹1,000–₹2,000 per m² of base and mounting area

• Installation & Commissioning: ₹1–₹2 lakh total

• O&M Costs: ~2–4% of capex annually (for routine servicing)

Example: A 50 kW system

• Digester (200 m³×₹20,000) = ₹40 lakh

• Engine-Generator (50×₹30,000) = ₹15 lakh

• Clean-up & Controls = ₹2 lakh

• Civil & Installation = ₹5 lakh

Total ≈ ₹62 lakh

This converts farm waste into renewable electricity and nutrient-rich digestate for soil enrichment—a win–win for sustainability and energy security.