A project developer can have land shortlisted, a digester quotation in hand and even a prospective CBG buyer, yet still have a weak project if the DPR assumes feedstock availability, gas output, subsidy and revenue without evidence.
A DPR for Bio CNG plant is not simply a document for showing machinery cost to a bank. It should connect verified feedstock supply with plant capacity, process design, utilities, wastewater, environmental classification, gas quality, capital expenditure, operating expenditure, offtake and debt-servicing capability.
For an Indian project, this assessment has become even more important following the approval of the new GOBARdhan National Circular Bioenergy Scheme on 6 August 2026 and the CPCB’s revised CBG/Bio-CNG pollution classification.
The correct next step is therefore not to start with a generic plant-cost figure. Start by validating feedstock, location, output route and regulatory category, and then build the engineering and financial model around those facts.
A strong Detailed Project Report should answer four questions for a promoter, lender and regulator:
A DPR that cannot answer all four questions may still look attractive on paper, but it is not yet ready for an investment decision.
A common planning mistake is to first select a “100 TPD plant” and then try to locate 100 tonnes of material every day.
The sequence should usually be reversed.
| DPR question | Evidence to collect | Why it matters |
|---|---|---|
| What material will enter the plant? | Feedstock description and source | Determines pre-treatment, digestion and CPCB category |
| How much is genuinely available? | Daily/monthly source data | Prevents over-sizing |
| Is supply seasonal? | 12-month availability profile | Determines storage and backup sourcing |
| What is the contamination level? | Sampling and source inspection | Changes sorting/pre-treatment needs |
| What is the expected biological performance? | Representative laboratory/technical assessment | Supports gas-yield assumption |
| How far will it travel? | Source-to-site logistics map | Determines delivered feedstock cost |
| Who controls the material? | MoU, supply agreement, concession or ownership evidence | Tests supply security |
| Does the supplier charge or pay? | Contracted price/tipping terms | Changes OPEX or revenue |
| What competing uses exist? | Local market assessment | Tests long-term availability |
| What happens when the main source stops? | Secondary-source plan | Supports downside case |
A cattle-dung project, press-mud project, source-segregated municipal wet-waste project and industrial organic-waste project can all require different pre-treatment, water, storage and environmental planning.
BIS’s current biomethane specification itself notes that raw biogas composition varies with feedstock. That is another reason a DPR should not copy a universal gas-yield number from another project.
Once feedstock is reasonably established, the DPR should build the mass balance.
A practical model normally follows:
Feedstock received
→ rejects/contaminants
→ usable organic feed
→ slurry/process preparation
→ anaerobic digestion
→ raw biogas
→ upgrading losses
→ saleable CBG
→ digestate
→ separated solid/liquid fractions
→ manure/reuse/disposal
Every material stream should have a destination.
This matters environmentally as well as financially. If 100 tonnes enter the site, the DPR cannot simply show the CBG output and ignore the remaining liquid, digestate, rejects and treatment residues.
The material balance should also reconcile with:
There is no single machinery list that is correct for every Bio-CNG project.
The equipment package should be selected after feedstock characterization and the intended gas-dispatch route are known.
| Function | Possible equipment | Main design driver |
|---|---|---|
| Receiving | Weighbridge, unloading platform, bunker | Feedstock form and vehicle movement |
| Segregation | Sorting/depackaging system | Contamination and packaging |
| Size reduction | Shredder, crusher, macerator | Fibrous/solid feed |
| Slurry preparation | Mixing/pulping tanks | Moisture and digestion system |
| Digestion | Digesters, mixers, heating arrangement | Feedstock and retention/process design |
| Gas storage | Gas holder | Production pattern and downstream system |
| H2S removal | Biological/chemical/media system | Raw-gas quality |
| CO2 removal/upgrading | Appropriate upgrading technology | Product specification and economics |
| Gas drying | Dryer/moisture-control system | Final CBG quality |
| Compression | CBG compressor | Delivery pressure/offtake route |
| Storage/dispatch | Cascades or pipeline interface | Buyer arrangement |
| Safety | Flare, gas detectors, relief systems | Process and regulatory design |
| Digestate | Solid-liquid separator | Manure/recycle strategy |
| Manure processing | FOM/LFOM handling, drying or enrichment system | Commercial by-product plan |
| Wastewater | Treatment/recycle facilities | Water balance and CPCB category |
| Controls | SCADA, instrumentation, metering | Automation and reporting |
| Laboratory | Gas/process testing equipment | Quality and process control |
For general plant design and operation, IS 9478:2023 is the current BIS code of practice. For the produced biomethane, the current specification is IS 16087:2025, Second Revision, not IS 16087:2016.
The 2025 revision was specifically updated to facilitate biomethane blending with natural-gas infrastructure and tightened relevant gas-quality parameters.
For Bio-CNG projects, wastewater is not just an operating-cost calculation.
It can affect the CPCB classification itself.
On 25 March 2025, CPCB directed SPCBs/PCCs to adopt a revised CBG/Bio-CNG classification. The categorisation distinguishes non-industrial feedstocks from industrial/process waste and also considers wastewater discharge and the manner in which specified by-products are processed.
| Project configuration under CPCB Annexure-I | Category |
|---|---|
| Listed non-industrial feedstocks, wastewater 50 KLD or above | Blue |
| Listed non-industrial feedstocks, wastewater below 50 KLD | Blue |
| Listed non-industrial feedstocks, no wastewater discharge, specified by-products/briquette-pellet processing using fuel | Blue |
| Listed non-industrial feedstocks, no wastewater discharge, specified by-products/briquette-pellet processing using electricity | White |
| CBG plant based on industrial/process waste | Red |
This makes the DPR’s feedstock description, water balance and manure-processing section regulatory inputs rather than decorative annexures.
A project should therefore avoid writing simply “Bio-CNG plant – White Category” or “Bio-CNG plant – Blue Category” without demonstrating the underlying configuration.
The applicable SPCB/PCC filing, consent or registration procedure should then be confirmed for the state where the facility will operate.
There is no universal one-line licence list for every Bio-CNG project.
A sensible approval dependency map is:
Land and feedstock confirmation
→ preliminary process design
→ mass and water balance
→ CPCB category determination
→ state SPCB/PCC route
→ detailed plant and safety layout
→ gas storage/compression route
→ GOBARdhan/offtake documentation
→ construction and equipment installation
→ pre-operation approvals/verification
→ commissioning and recurring compliance
Depending on the project, the DPR should assess the following.
Blue and Red category facilities should identify the applicable SPCB/PCC consent and authorization pathway. White-category projects should verify the exemption/registration mechanism applicable in the relevant state rather than assuming the same process applies everywhere.
Where the plant receives municipal or other solid waste falling within the applicable framework, the Solid Waste Management Rules, 2026 are now the current central rules. They superseded the 2016 rules and came into force on 1 April 2026.
The GOBARdhan Unified Registration framework states that a CBG/Bio-CNG plant seeking benefits or support from government ministries/departments should obtain its registration number; the latest official policy material specifically states that the registration number is required for MoPNG benefits and support.
PESO applicability should be decided from the actual storage, filling and dispensing arrangement.
For example, PESO’s Form C under the Gas Cylinder Rules relates to licensing to fill and/or store compressed gas in cylinders, while the SMPV(U) Rules cover compressed gas in static and mobile pressure vessels.
PESO also issued a specific CNG/CBG compressor circular on 2 April 2026 and launched a combined automotive-fuel dispensing licence module on 8 July 2026.
The practical lesson is simple: do not write “PESO licence required” as a generic line in every DPR. Map the exact equipment and gas-dispatch configuration to the applicable route.
Fire, factory, land-use, building and other local/state approvals should similarly be checked against the project’s actual location and operating model.
The investment chapter should be a cost build-up, not a single generic market figure.
A Bio-CNG DPR should separately estimate:
One government benchmark can be used carefully.
A Ministry of Housing & Urban Affairs letter dated 12 November 2025 revised the SBM-U 2.0 norm for applicable 100 TPD MSW-based biomethanation/CBG projects to ₹32 crore per 100 TPD. The referenced normative component framework totals ₹32.40 crore, comprising land development, civil works, equipment/processing systems and soft costs.
This figure must not be presented as the standard cost of every Bio-CNG plant.
It is specific to a 100 TPD MSW-based framework under SBM-U. A cattle-dung plant, press-mud facility, agro-residue project or industrial-feedstock unit can have materially different feed preparation, storage, water, technology and logistics requirements.
Actual DPR cost should therefore be built from project-specific quotations and quantities.
A good revenue model separates what is contracted from what is merely possible.
A transparent formula is:
Annual CBG revenue = Saleable CBG per operating day × operating days × net realised CBG price
The important term is net realised price, not a headline market or scheme number.
The model should account for, where applicable:
Model:
Annual manure revenue = saleable quantity × net realised price
The DPR should establish:
The CPCB classification itself refers to FOM/LFOM and applicable fertilizer-control requirements for relevant configurations, which is why manure handling should be designed as an operating system, not shown merely as an additional revenue line.
Include this revenue only where a municipality, institution or waste generator has a credible contractual obligation to pay it.
Do not assume that every waste stream will generate a tipping fee.
Some feedstocks may instead have a purchase cost.
These can be included where the technology, product specification, purification requirement and buyer arrangement are demonstrated.
They are better treated as an upside case if no buyer exists at DPR stage.
Carbon-credit income should generally stay out of the lender’s core case unless:
A carbon-credit estimate is not the same as contracted project revenue.
A useful DPR can classify revenues this way:
Executed or near-final CBG offtake with defined commercial terms.
FOM/LFOM revenue supported by quality plan and identifiable buyer market.
Contract-backed tipping/gate fees.
Government capital assistance or financing support for which eligibility and sanction are still pending.
Carbon credits, recovered CO2 or other speculative by-product value without an executed route to monetisation.
The financial model should not compensate for a weak Tier-A revenue case by adding several optimistic Tier-D and Tier-E assumptions.
On 6 August 2026, the Union Cabinet approved GOBARdhan, the National Circular Bioenergy Scheme, with a total outlay of ₹23,731 crore for FY 2026-27 to FY 2035-36. It integrates offtake, pricing, capital assistance, pipeline infrastructure, credit support and other ecosystem measures.
Several elements are directly relevant to DPR preparation.
The official framework gives the forward obligation as:
for the specified CNG Transport and PNG Domestic segments.
That creates a stronger policy demand signal, but a DPR still needs a project-specific offtake route.
The scheme announcement states an administered CBG price of ₹2,110/MMBTU, stated as equivalent to ₹105/kg, with a minimum ten-year horizon.
For financial modelling, use this as a current policy reference, not automatically as the exact cash receipt of every plant.
The lender case should preferably use the contractual net realisation available to that project.
Eligible greenfield CBG projects are stated to receive capital assistance of up to ₹2 crore per TPD of installed CBG capacity, with the scheme also covering certain value-chain assets and brownfield expansion.
The words “eligible” and “up to” matter.
A DPR prepared immediately after the policy announcement should not deduct the maximum assistance from project CAPEX unless applicable detailed eligibility conditions and sanction have been verified.
A better presentation is:
The framework also provides credit-guarantee coverage of up to 85% on eligible loans for eligible MSME-based CBG projects.
Again, this is a financing-support mechanism, not an 85% grant.
That distinction should be very clear in the DPR.
The DPR should separately model at least:
A project may show attractive gross CBG revenue yet still have weak cash generation if feedstock logistics, energy consumption and plant availability are underestimated.
Once technical assumptions have been established, the model may calculate:
But these outputs are only as reliable as the assumptions underneath them.
The DPR should test what happens when:
A project that remains viable only under the most optimistic combination should be identified as such.
A practical sequence is:
1. Identify feedstock and source
↓
2. Test availability, composition and logistics
↓
3. Establish preliminary CBG capacity
↓
4. Prepare process, mass and water balance
↓
5. Determine CPCB category
↓
6. Verify land and state SPCB/PCC route
↓
7. Freeze machinery and layout principles
↓
8. Map PESO/fire/factory/local requirements as applicable
↓
9. Finalise CBG offtake and GOBARdhan route
↓
10. Build CAPEX, OPEX and financial sensitivities
↓
11. Complete lender/approval-ready DPR
This sequence reduces the risk of buying equipment first and redesigning the compliance file later.
Before commissioning a final DPR, a promoter should be able to answer:
8-10 Yes: suitable for detailed DPR development.
5-7 Yes: complete feasibility/document-gap work before freezing CAPEX.
Below 5 Yes: the project concept is still too assumption-heavy for a final lender-oriented DPR.
This is a planning test, not a government scoring system.
Feedstock composition and operating technology matter. Use project-specific support.
An oversized digester does not create feedstock.
Digestate, reject material, wastewater and losses must also be reconciled.
Equipment should match feedstock preparation, digestion technology and dispatch route.
The March 2025 classification expressly differentiates projects by feedstock, wastewater and by-product-processing configuration.
The latest GOBARdhan framework uses terms such as eligible and “up to.” Build the base case conservatively until project-specific entitlement is confirmed.
Transport, evacuation and contract-specific costs matter.
Digestate exists whether or not it is sold. The DPR needs an operational plan even when manure revenue is assumed at zero.
Compressed-gas equipment and storage arrangements can affect the safety layout.
A single IRR number hides the assumptions that actually drive project risk.
The ideal time is after preliminary feedstock and site feasibility but before major equipment and civil-construction commitments are locked.
At that point, the DPR can still influence:
A document prepared after the machinery has already been purchased often becomes a justification exercise rather than a planning tool.
Green Permits’ plant-setup service framework covers feasibility, DPR preparation, process-flow and layout inputs, regulatory mapping and environmental approval support for green industrial projects.
For a Bio-CNG project, the scope can be structured around:
The final scope should be confirmed from the proposed feedstock, capacity, location, technology and available project evidence.
A Bio-CNG DPR is the technical, regulatory and financial model for a proposed compressed-biogas project. It should establish feedstock availability, capacity, process design, machinery, utilities, mass and water balance, environmental systems, investment, operating cost, revenue, approvals and financial sensitivity.
There is no single reliable cost applicable to every CBG plant. Feedstock, processing technology, output capacity, storage/offtake route, land, wastewater treatment, manure system and location can materially change CAPEX.
For context only, MoHUA currently uses a ₹32 crore per 100 TPD norm for applicable MSW-based biomethanation projects under SBM-U 2.0. It should not be generalized to other CBG projects.
The GOBARdhan framework approved on 6 August 2026 states an administered price of ₹2,110/MMBTU, described officially as equivalent to ₹105/kg, with a minimum ten-year horizon. Actual project modelling should use the applicable contract and net realisation.
The current framework states capital assistance of up to ₹2 crore per TPD of installed CBG capacity for eligible greenfield projects, with eligible brownfield expansion also covered. Project-specific eligibility and sanction should be verified before including the benefit as certain cash flow.
No. CPCB’s March 2025 direction includes Blue, White and Red CBG/Bio-CNG configurations. Feedstock type, wastewater discharge and specified by-product-processing method affect classification.
The current biomethane specification is IS 16087:2025, Second Revision. IS 9478:2023 provides a code of practice for the design, construction, installation and operation of biogas/biomethane plants.
The exact requirement depends on how compressed gas is stored, filled and dispatched. Gas cylinders, cascades, pressure vessels, compressors and dispensing arrangements can trigger different PESO requirements, so the safety route should be mapped from the actual layout.
A DPR for Bio CNG plant should make the project more transparent, not simply make the numbers look attractive.
Start with defensible feedstock. Use that to establish capacity and the material balance. Select machinery around the feedstock and offtake route. Determine environmental classification from the real water and process configuration. Build investment from quantities and quotations. Then model revenue using contracted or defensible net realisations, with government support and speculative by-products separated from the base case.
That approach gives promoters, lenders and regulators a much clearer basis for deciding whether the project is genuinely ready to proceed.
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