Composting vs Biogas: A Clear Comparison

By BIOPOWER (BPG Renewables) · Updated June 2026 · Organic Waste Converter

Composting turns organic waste into soil-enriching compost and is simple and low-cost, while biogas (anaerobic digestion) additionally captures energy as fuel. Choose composting if you mainly need waste reduction and manure; choose biogas if you also want to offset fuel or electricity costs.

How do composting and biogas differ?

Factor	Composting / OWC	Biogas plant
Main output	Compost	Biogas (fuel) + slurry manure
Energy recovery	No	Yes
Process	Aerobic (with oxygen)	Anaerobic (no oxygen)
Upfront cost	Lower	Higher
Best for	Dry + wet mixed waste	Wet, high-energy waste

Which is cheaper to run?

Composting and OWC machines have lower capital costs and simple operation. Biogas plants cost more upfront but generate fuel savings that often deliver faster net payback for high-volume sites.

Can you combine both?

Yes. Many large sites use biogas for wet, energy-rich waste and composting for the digestate or garden waste — maximising recovery. BIOPOWER offers OWC and biogas systems and can recommend the right mix.

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Frequently Asked Questions

Is biogas better than composting?

Neither is universally better. Biogas recovers energy and suits wet waste; composting is simpler and cheaper. The best choice depends on waste type, volume, and whether you need fuel.

Does composting produce any gas?

Composting is aerobic and releases mostly CO₂ and heat, not usable fuel. Biogas digestion is anaerobic and produces methane-rich gas you can burn.

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