Converting crisis into opportunity: Why paddy straw-based CBG deserves special funding
An analysis argues that compressed biogas (CBG) produced from paddy straw represents a viable solution to crop residue burning, but requires targeted policy interventions to scale beyond its current limited deployment.
The SATAT scheme — launched in October 2018 by the Ministry of Petroleum and Natural Gas — aimed to establish 5,000 CBG plants by 2025, but only ~100 plants with ~700 MT/day capacity had been commissioned by March 2025, a significant shortfall.
CBG produced from paddy straw can displace natural gas/CNG imports, generate fermented organic manure (bio-compost) as a by-product, and earn carbon credits — creating multiple revenue streams that improve project viability.
Key policy gaps identified: long-term feedstock procurement agreements with farmers, gas grid connectivity for CBG producers, quality standards enforcement, and a carbon credit framework specifically for agricultural waste-to-energy projects.
India's compliance carbon credit market (Carbon Credit Trading Scheme — CCTS) is expected to begin trading by October 2026, opening a new revenue stream that could significantly improve the economics of paddy straw CBG plants.
SATAT Scheme (Sustainable Alternative Towards Affordable Transportation)
SATAT is a scheme launched on 1 October 2018 by the Ministry of Petroleum and Natural Gas (MoP&NG) to promote Compressed Biogas (CBG) as an automotive fuel alternative. Under SATAT, Oil Marketing Companies (Indian Oil, BPCL, HPCL) issue Letters of Intent (LoIs) to CBG producers and commit to purchasing CBG at notified prices, integrating it into the existing CNG distribution network. The scheme targets 5,000 CBG plants and 15 million MT/year of CBG production — approximately 40% of current CNG consumption (~44 million MT/year).
Key Details
- SATAT launch date: 1 October 2018
- Nodal ministry: Ministry of Petroleum and Natural Gas (MoP&NG)
- Implementing agencies: Indian Oil Corporation, BPCL, HPCL (OMCs)
- Target: 5,000 CBG plants and 15 million MT/year CBG production
- Status by March 2025: ~100 plants commissioned, ~700 MT/day installed capacity
- Feedstocks: paddy straw, municipal solid waste, sugarcane press mud, cattle dung, poultry litter
SATAT is the primary policy vehicle for paddy straw-based CBG, but the gap between target (5,000 plants) and achievement (~100 plants) underscores the systemic policy failures the article diagnoses — economic viability, infrastructure connectivity, and feedstock supply chains all need strengthening.
Compressed Biogas (CBG): Technology and Economics
Biogas is produced by anaerobic digestion of organic matter (paddy straw, food waste, animal manure) by microorganisms in the absence of oxygen. The gas is primarily methane (CH₄) and CO₂. When CO₂ is stripped out and the remaining gas is compressed, it becomes CBG — with calorific value and energy density similar to CNG, making it a drop-in fuel substitute. The by-product of anaerobic digestion — fermented organic manure (FOM) — is a high-quality biofertiliser.
Key Details
- CBG composition: ~95% methane (after CO₂ scrubbing); calorific value ~52 MJ/kg — similar to CNG
- Feedstock yield: ~1 MT paddy straw produces ~100–120 m³ biogas → ~80 kg CBG
- By-product: fermented organic manure (FOM) — marketable as biofertiliser
- Capital cost: ₹15–18 crore for 5 MT/day paddy straw processing plant
- Gross margins: 25–28% with stable feedstock supply and FOM monetisation
- CBG also earns carbon credits under CDM/carbon markets for methane avoidance
The economics improve substantially when all revenue streams are counted: CBG sale + FOM sale + carbon credits. The policy gap is that most plants cannot access all three simultaneously — gas grid connectivity issues, weak FOM markets, and an immature carbon credit framework reduce realised revenues.
Carbon Credit Trading Scheme (CCTS) India
India's carbon market framework — the Carbon Credit Trading Scheme (CCTS) — was notified in 2023 under the Energy Conservation (Amendment) Act, 2022. It establishes a compliance market (for obligated sectors with emission intensity targets) and an offset mechanism (for non-obligated sectors, including agriculture and waste). The Bureau of Energy Efficiency (BEE) under the Ministry of Power is the regulatory administrator. India's compliance market is expected to begin trading Carbon Credit Certificates (CCCs) by October 2026.
Key Details
- Legal basis: Energy Conservation (Amendment) Act, 2022
- Regulator: Bureau of Energy Efficiency (BEE), Ministry of Power
- Two components: (1) compliance market for obligated sectors; (2) offset/voluntary market for others
- Sectors notified for emission intensity targets in 2025: aluminium, cement, chemicals, fertiliser, iron and steel, paper and pulp, petro-chemicals, textiles
- First compliance trading expected: October 2026
- Agriculture/waste projects: can generate offset credits (non-obligated sector)
CBG plants processing paddy straw earn carbon credits by: (1) avoiding methane emissions from straw decomposition; (2) avoiding GHG emissions from straw burning; (3) displacing fossil CNG. India's emerging CCTS and Green Credit Programme could formalise and value these reductions, improving CBG project economics.
India's Natural Gas Import Dependence and Energy Security
India imports ~45–50% of its natural gas consumption (LNG and piped gas). CBG as a domestic substitute for CNG/natural gas directly reduces import dependence and the foreign exchange burden. With natural gas prices linked to global markets (including Henry Hub and JKM benchmarks), domestic CBG provides price stability and energy security benefits beyond just environmental gains.
Key Details
- India's natural gas import dependence: ~45–50% of consumption
- CNG consumption: ~44 million MT/year (current)
- SATAT CBG target: 15 million MT/year (~34% of CNG demand substitution potential)
- CBG price: notified by MoP&NG; linked to CNG retail price with a discount
- Paddy straw CBG carbon intensity: significantly lower than natural gas (lifecycle)
- 2G ethanol and CBG: competing end-uses for paddy straw, requiring policy coordination
Scaling paddy straw CBG aligns three policy objectives simultaneously: reducing crop residue burning (environmental), reducing natural gas imports (energy security), and generating farmer income from waste (agricultural economics) — making it a rare win-win-win intervention that deserves stronger policy priority.
- SATAT scheme launch: 1 October 2018, by Ministry of Petroleum and Natural Gas
- SATAT target: 5,000 CBG plants; 15 million MT/year CBG production
- SATAT status (March 2025): ~100 plants commissioned; ~700 MT/day capacity
- CBG vs CNG: similar calorific value (~52 MJ/kg); drop-in fuel substitute
- Paddy straw feedstock: Punjab generates ~20–22 million MT/year
- CBG yield: ~80 kg per MT of paddy straw (approximate)
- Capital cost (5 MT/day plant): ₹15–18 crore
- By-product: Fermented Organic Manure (FOM) — biofertiliser market
- Carbon Credit Trading Scheme (CCTS): notified 2023; trading expected October 2026
- Legal basis for CCTS: Energy Conservation (Amendment) Act, 2022
- CCTS regulator: Bureau of Energy Efficiency (BEE), Ministry of Power
- India natural gas import dependence: ~45–50% of consumption
- India CNG market size: ~44 million MT/year
- Gross margins CBG project: 25–28% with feedstock stability + FOM monetisation + carbon credits