Biogas Plant Guide: Types, Working, Cost, and Setup Process in India

 Every day, homes and farms throw away organic waste — cow dung, kitchen scraps, crop residue. That waste can become clean cooking gas and organic fertilizer through a biogas plant. This guide covers how a biogas plant works, its cost, and how to set one up, whether you want a small biogas plant for home use or a large bio CNG plant for commercial energy.


What Is a Biogas Plant?

A biogas plant is a sealed system that breaks down organic waste — like gobar (cow dung), food waste, and agricultural residue — without oxygen. This natural process, called anaerobic digestion, produces gobar gas (biogas), a mix of methane and carbon dioxide that can be burned for cooking, heating, or electricity. The leftover slurry becomes a nutrient-rich organic fertilizer, so nothing goes to waste.

How Does a Biogas Plant Work?

The working of a biogas plant is fairly simple:

  1. Feeding – Waste (dung, food scraps, crop leftovers) is mixed with water and fed into a digester tank.

  2. Digestion – Bacteria break down the waste without oxygen, releasing methane-rich gas over several days.

  3. Gas collection – Gas rises and collects in a dome or floating gas holder.

  4. Storage and use – Gas is piped out directly or compressed into a bio gas cylinder for portable use.

  5. Slurry output – Digested waste exits as bio-slurry, a rich organic fertilizer for farms and gardens.

Types of Biogas Plants

There are a few common types of biogas plants used across India and globally:

  • Fixed Dome Plant – A permanent underground structure, popular for domestic biogas plant setups because it's durable and low-maintenance.

  • Floating Drum Plant – Uses a movable gas holder that rises as gas accumulates; gives a steady gas pressure.

  • Balloon Plant – A flexible, low-cost design made from durable synthetic material, good for small biogas plant for home needs.

  • Bio-CNG / CBG Plant – A larger, industrial-scale plant that upgrades raw biogas into Compressed Biogas (CBG), which can replace CNG in vehicles and industries.

Differentiating Biogas from Natural Gas

People often ask how to differentiate between natural gas and biogas. Natural gas is a fossil fuel extracted from deep underground reserves formed over millions of years. Biogas, on the other hand, is a renewable fuel produced continuously from organic waste through anaerobic digestion. Once biogas is purified to remove carbon dioxide and moisture, it becomes CBG (Compressed Biogas) — chemically very close to natural gas and usable in the same engines and appliances.

CBG Full Form and Its Growing Role

CBG full form is Compressed Biogas. It is purified biogas with over 90% methane content, compressed for use as automotive fuel, industrial fuel, or piped cooking gas. India's SATAT scheme actively promotes bio CNG plant and CBG plant projects as part of the country's push toward clean energy and waste management.

Uses of Biogas and Gobar Gas

The uses of biogas (also called uses of gobar gas) include:

  • Cooking fuel for households and canteens

  • Electricity generation in rural and industrial setups

  • Vehicle fuel after upgrading to CBG

  • Heating for poultry farms and greenhouses

  • Organic manure (bio-slurry) for improving soil health

Biogas Plant Cost and Subsidy

The bio gas plant price depends on size, technology, and capacity:

  • A mini biogas plant price or small home unit (1–4 cubic meters) may cost a modest amount, suitable for a family kitchen.

  • A domestic biogas plant built with brick-and-cement fixed dome design costs more due to civil construction.

  • A CBG plant or biotech biogas plant for commercial or industrial scale runs into significant capital investment, depending on feedstock and gas output capacity.

Many states also offer a gobar gas plant subsidy under central and state government schemes to promote rural clean energy, which can reduce the effective gobar gas plant cost for farmers and households.

How to Start a Biogas Plant Project

Setting up a biogas plant project typically involves site selection, feedstock assessment, choosing the right digester type, applying for approvals or subsidies, and installation. Businesses planning a CBG or bio-CNG plant also need environmental clearances and regulatory registrations before commissioning.

If you're exploring options to buy a biogas plant for sale or start a commercial venture, working with an experienced compliance partner like Corpseed can simplify documentation, licensing, and approvals for your biogas plant setup.

FAQs About Biogas Plants

1. How is biogas produced? Biogas is produced when organic waste like cow dung or food scraps decomposes in an oxygen-free digester through a process called anaerobic digestion, releasing methane gas.

2. What is the difference between biogas and CBG? Biogas is raw gas straight from the digester. CBG (Compressed Biogas) is biogas purified and compressed to over 90% methane, making it suitable for use like CNG.

3. Is there a subsidy available for a gobar gas plant in India? Yes, several central and state government schemes offer subsidies to reduce the cost of setting up domestic and small-scale biogas plants.

4. Can I install a small biogas plant at home? Yes, a small biogas plant for home use, such as a fixed dome or balloon model, is designed for households with regular access to cow dung or kitchen waste.

5. What documents are needed for a biogas plant setup? Requirements vary by plant size and use, and commercial or CBG plants generally need site clearance, environmental approvals, and other regulatory registrations.

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