Critically evaluate the role of fiscal incentives (excise duty exemptions) versus regulatory mandates (blending obligations) in scaling up India's compressed biogas sector.

Compressed Biogas (CBG) — chemically identical to CNG but produced from agricultural residue, cattle dung and municipal waste — is India's most promising import-substituting transport fuel. SATAT (2018) envisaged 5,000 plants producing 15 MMT annually by 2023-24 [1]; the wide shortfall against this makes the incentive-versus-mandate debate central.

Merits of the fiscal route

• Central excise duty exemption on CNG blended with CBG, effective 2 February 2023, ended double taxation and directly improved plant-level margins [2].
• Inclusion of CBG in carbon credit trading under bilateral approaches (February 2023) added a second revenue stream for plant owners [2].
• Being non-discretionary and rule-based, tax relief is administratively cheap and market-neutral.

Limits of the fiscal route

• Incentives lower costs but do not guarantee offtake; under voluntary purchase, only 12 CBG plants were commissioned in FY 2023-24 against the SATAT vision [2].
• Tax relief cannot resolve feedstock aggregation, land acquisition or CGD pipeline connectivity — the binding capital bottlenecks.

Merits of regulatory mandates

• The CBG Blending Obligation — 1% (2025-26), 3% (2026-27), 4% (2027-28), 5% from 2028-29 of CNG/PNG consumption — creates assured demand [3].
• It is expected to catalyse roughly ₹37,500 crore of investment and 750 projects by 2028-29 — bankability that fiscal relief alone failed to deliver [3].
• It advances LNG import substitution, forex savings and a circular economy [3].

Limits of mandates

• Mandates manufacture demand without creating supply; if output lags, distributors bear compliance costs that reach consumers.
• Delivery depends on multi-ministerial coordination under GOBARdhan, where accountability is diffuse [2].

The two instruments are complementary rather than competing: mandates supply demand certainty, fiscal relief protects viability. The real constraint is now execution — feedstock supply chains, timely commissioning and pipeline access. Pairing both with priority-sector lending and farmer-linked feedstock markets can make CBG a genuine energy-security and circular-economy instrument, advancing SDG 7 and India's net-zero 2070 commitment.