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CSIR-IICT (Hyderabad) has developed indigenous technologies—Dry Anaerobic Digester with Unique Hydrodynamics (DADUH), Bi-phasic Anaerobic Digester System (BiADS), and Anaerobic Gas Lift Reactor (AGR)—to convert agricultural residues and organic waste into compressed biogas (CBG) and manure. Three full-scale CBG plants are under development (12 TPD in Telangana, 5 TPD in Assam, 3 TPD in Telangana using Napier grass). The Bowenpally vegetable market plant (Hyderabad) processes 10–12 tonnes waste daily, reducing disposal costs by ~60%. Around 40 AGR-based plants are operational nationwide, licensed to 15 companies. The SATAT initiative aims for 5,000 CBG plants producing 15 million metric tonnes annually. These efforts align with Swachh Bharat Mission, energy security, and Viksit Bharat 2047.
Biogas technology in India dates to the 1950s with the KVIC biogas plant (floating drum) and later the Deenbandhu model (fixed dome). The National Biogas and Manure Management Programme (NBMMP) was launched in 1981-82. [GK] In 2018, the Ministry of Petroleum and Natural Gas launched the SATAT (Sustainable Alternative Towards Affordable Transportation) scheme to promote CBG as a transport fuel. [GK] CSIR-IICT has worked on biogas since the 1990s, developing the AGR technology for wet wastes and later DADUH and BiADS for dry biomass. The Bowenpally plant (commissioned 2020) gained national attention after PM Modi's 'Mann Ki Baat' address. [Source] Recent developments include scaling up to 40+ AGR plants and three CBG plants under construction.
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15 MayPolitical & Constitutional Dimensions: The government promotes CBG under SATAT, Swachh Bharat Mission, and energy security goals. PM's 'Mann Ki Baat' endorsement gives political impetus. However, challenges include state-level coordination for waste segregation and feedstock supply. Constitutional aspects involve distribution of powers: energy (Concurrent List), agriculture (State List), and environment (Concurrent List). The CBG push aligns with Article 243W (municipal solid waste management) and the Solid Waste Management Rules, 2016. [GK]
Economic & Financial Impact: CBG reduces fossil fuel imports and supports rural incomes. The Bowenpally plant reduced monthly waste disposal costs from ₹3-5 lakh to ~60% less. [Source] SATAT's target of 15 MMTPA CBG could save ₹1.5 lakh crore in imports (estimated). [GK] However, high capital costs (₹4-5 crore per plant) and feedstock price volatility pose risks. The PSB (Phased Manufacturing Programme) and viability gap funding are needed.
Social Dimensions: CBG benefits farmers by converting crop residues (paddy straw) into income, reducing stubble burning and air pollution. The Kadapa school units improve child nutrition and reduce LPG dependence. [Source] Women's groups can manage decentralised plants. But land acquisition for large plants and community acceptance of biogas plants near settlements remain issues.
Governance & Administrative Aspects: Implementation challenges include uniform feedstock supply (e.g., Bowenpally disruptions due to shortage). [Source] Multiple ministries (Petroleum, New & Renewable Energy, Agriculture, Environment) require coordination. The SATAT scheme provides a single-window clearance but state-level facilitation is uneven. Institutional capacity at municipalities and rural bodies needs strengthening.
International Perspective: Globally, countries like Germany (6,000+ biogas plants) under the EEG (Renewable Energy Act) have succeeded. India can learn from Germany's feed-in tariffs and quality standards. The US Renewable Fuel Standard includes biogas. CBG can help India meet its Nationally Determined Contributions (NDCs) under the Paris Agreement. Treaties like the Kigali Amendment (HFC phase-down) are indirectly linked through alternative fuels.
Short-term: Ensure stable feedstock supply through aggregation models (farmer-producer organisations) and waste segregation at source. Operationalise the three CBG plants under construction. Provide capital subsidies under SATAT (₹1-1.5 crore per plant) to lower upfront costs. [GK]
Medium-term: Mandate CBG blending in CNG/PNG (like ethanol blending) to create assured demand. Replicate the school-based model (Kadapa) across states. Strengthen R&D for cost reduction of DADUH and BiADS.
Long-term: Achieve SATAT's 5,000 plants by 2030 by simplifying land acquisition and power purchase. Create a national biogas grid for injection into piped natural gas networks. Integrate with waste-to-energy missions and circular economy action plan. Adopt best practices from Germany (feed-in tariffs) and Sweden (biogas vehicle fleet).