A sugar mill in western Uttar Pradesh was sitting on a problem that did not look like a problem at first.
Every crushing season, thousands of tonnes of press mud were generated. The material had some local value, but the management team kept hearing the same idea from project developers: instead of treating press mud only as a by-product, why not convert it into Compressed Bio Gas?
On paper, the proposal looked attractive. Feedstock was available within the factory boundary. India was encouraging CBG production. Oil marketing and city gas companies were looking at cleaner fuel alternatives. Government schemes were being discussed. Banks were showing interest in renewable-energy projects.
But when the promoters started working on the numbers, the project became more complicated.
How much press mud would actually be available throughout the year? What would happen after the sugarcane crushing season ended? How much CBG could realistically be produced? Would the Government subsidy come before commissioning or after investment? Could the subsidy be included while calculating the bank loan? Would a lender finance the project without a long-term feedstock agreement?
These are the questions that decide whether a press mud Bio-CNG project moves from an idea to financial closure.
In 2026, the funding environment for CBG projects has become significantly stronger. India has introduced a much larger policy framework for CBG under the GOBARdhan National Circular Bioenergy Scheme. At the same time, project developers can explore debt financing through institutions such as IREDA and commercial banks.
However, subsidy availability alone cannot make a weak project viable.
A bankable press mud Bio-CNG plant needs 4 things working together: feedstock security, realistic plant performance, CBG offtake and a financially sound Detailed Project Report.
Press mud is generated during sugar manufacturing when impurities are removed from sugarcane juice. India has a large sugar industry, which means significant quantities of press mud are generated every year across major sugar-producing states.
For sugar mills, press mud has traditionally been used in applications such as composting, soil conditioning or organic manure production. But its organic content also makes it suitable for anaerobic digestion.
In a Bio-CNG project, organic material is processed inside digesters where microorganisms break it down in the absence of oxygen. This produces raw biogas containing methane, carbon dioxide and smaller quantities of other gases.
The raw biogas is then upgraded.
Carbon dioxide, hydrogen sulphide, moisture and other impurities are reduced so that the methane-rich gas can be compressed and marketed as CBG.
For a sugar mill or project developer, this creates the possibility of converting an existing industrial residue into a commercial fuel.
But press mud has one major characteristic that directly affects financing.
It is seasonal.
A sugar mill may generate a large quantity during its crushing season, but a Bio-CNG plant is normally designed to operate for most of the year. This means feedstock storage, alternate feedstock planning and annual material balance become critical parts of the DPR.
A lender will not be satisfied only because a sugar mill says that “enough press mud is available.”
The project must demonstrate how much feedstock will be available, when it will be generated, how it will be stored and how much it will cost to deliver it to the digester.
The biggest policy development for the sector is the GOBARdhan National Circular Bioenergy Scheme.
The scheme has a total announced outlay of approximately ₹23,731 crore and covers the period from FY 2026-27 to FY 2035-36.
Press mud is among the organic resources relevant to the CBG ecosystem.
For eligible new greenfield CBG projects, the policy framework provides for capital assistance of up to approximately ₹2 crore per TPD of installed CBG capacity, subject to applicable conditions and detailed implementation requirements.
This headline number immediately attracts project developers.
For example, consider a proposed 5 TPD CBG plant.
At ₹2 crore per TPD, the theoretical upper level of capital assistance could reach:
5 TPD x ₹2 crore = ₹10 crore
For a 10 TPD plant, the headline maximum could theoretically reach:
10 TPD x ₹2 crore = ₹20 crore
But this calculation should not be treated as a guaranteed subsidy.
The words “up to” are extremely important.
Actual assistance can depend on factors such as project eligibility, approved capacity, scheme guidelines, eligible components, commissioning conditions, application procedure and Government sanction.
A DPR should therefore never reduce the project cost automatically by the maximum possible subsidy.
A better approach is to prepare 2 financial models.
The first model should calculate project viability without assuming unapproved capital assistance.
The second can show the impact if eligible Government assistance is received.
This gives banks and promoters a much more realistic understanding of project risk.
Many websites still mention older MNRE Waste-to-Energy support structures.
One commonly quoted number for Bio-CNG projects was approximately ₹4 crore for 4,800 kg per day of Bio-CNG capacity, subject to applicable ceilings and conditions.
That figure came from an earlier policy period.
The previous Waste-to-Energy programme covered the period up to FY 2025-26, and fresh applications under the earlier structure were restricted before the new national framework emerged.
This matters because project developers frequently copy subsidy assumptions from older DPRs.
Suppose a project report prepared in 2024 assumed one particular subsidy structure. If the same DPR is reused in late 2026 without updating the policy position, the project’s entire funding calculation can become misleading.
A difference of even ₹5 crore to ₹10 crore in assumed Government assistance can materially change:
This is why subsidy verification should happen before finalizing financial closure.
Capital assistance receives most of the attention, but a CBG project depends equally on revenue certainty.
The 2026 policy framework also strengthens the sector through offtake and pricing support.
An administered CBG price of around ₹2,110 per MMBTU has been announced under the framework with a long-term horizon.
For project developers, price visibility is important because lenders calculate repayment capacity using expected cash flows.
If the plant has a defined offtake arrangement and predictable pricing mechanism, revenue estimates become easier to defend.
The CBG obligation also strengthens demand.
The obligation is designed to increase over time.
For investors, these numbers signal that India is gradually creating mandatory demand for CBG in specified gas-consumption segments.
However, national demand does not automatically guarantee offtake for every plant.
A 5 TPD project still needs to answer a practical question:
Who will buy approximately 5 tonnes of CBG every operating day?
The answer may involve an OMC, CGD network, industrial consumer, cascade distribution arrangement or another permitted route.
The project DPR should identify the actual sales route rather than simply stating that “CBG demand is high.”
IREDA is an important financing institution for renewable-energy and waste-to-energy projects.
CBG projects based on organic feedstocks, including press mud, can fall within relevant financing categories subject to project appraisal.
A commonly referenced project-finance structure can go up to approximately 70% debt, depending on eligibility and appraisal.
This means a project could potentially be structured around a debt-equity ratio close to 70:30.
Consider a simplified example.
Suppose the total project cost is ₹50 crore.
Under a 70:30 structure:
Now assume the project later receives eligible capital assistance.
The financial structure may change depending on how the lender and scheme guidelines treat the assistance.
This is why the timing of subsidy disbursement matters as much as the subsidy amount.
If assistance comes only after project commissioning, the promoter may still need to arrange the original project funding during construction.
A project promoter may focus on machinery, but banks usually evaluate the business from a different perspective.
The lender wants to know whether the project can generate enough cash consistently to repay principal and interest.
For a press mud plant, 5 areas become particularly important.
A 5 TPD CBG facility may require a significant daily quantity of organic feedstock depending on moisture content, volatile solids and actual gas yield.
The DPR should not use a generic feedstock ratio copied from another plant.
Feedstock testing and process design should support the numbers.
The lender may ask:
Zero-cost feedstock should not automatically be assumed.
Even when press mud belongs to the sugar mill, it may have an internal economic value.
There may also be expenses related to:
A ₹300 to ₹500 per tonne change in delivered feedstock cost can materially affect annual operating expenses when thousands of tonnes are consumed.
CBG output must be linked to actual feedstock characteristics.
A DPR should establish:
feedstock input -> biogas generation -> methane percentage -> purification losses -> final CBG output.
If any one of these assumptions is overstated, annual revenue may be exaggerated.
Lenders prefer projects where revenue visibility exists before commissioning.
An expression of interest is helpful, but a stronger commercial arrangement may significantly improve bankability.
Banks also evaluate the promoter.
A renewable-energy project is not financed only because the technology works.
The lender may review:
Press mud projects have an advantage because sugar mills can provide concentrated feedstock from one location.
But the same model creates seasonal dependency.
Suppose a sugar mill operates for around 150 days during the crushing season.
If the Bio-CNG plant is expected to operate for around 330 days, feedstock generated during the 150-day sugar season has to support operations for a much longer period.
This creates a storage requirement.
A developer must calculate how many tonnes need to be stored, what area is required and what losses may occur during storage.
Another approach is co-digestion.
The plant may use alternative organic materials during the off-season.
Possible feedstocks could include agricultural residues, cattle dung or other suitable organic waste, depending on technical compatibility, permissions and economics.
But changing the feedstock also changes the biology of the digester.
Therefore, alternate feedstock cannot simply be added to a financial model without technical assessment.
Consider an illustrative 5 TPD project near a sugar cluster.
The promoter has identified a sugar mill that can supply press mud. The mill generates sufficient material during the crushing period, but annual availability has not yet been contractually secured.
The developer initially prepares the project based on 4 assumptions:
At first, the financial model shows strong profitability.
But during lender review, problems appear.
The sugar mill has alternative buyers for press mud.
Storage losses have not been included.
Transportation between the mill and plant has been ignored.
The subsidy has not been sanctioned.
The offtake arrangement is only under discussion.
Once realistic feedstock cost, storage expense and financing delay are added, the project IRR falls.
This does not necessarily mean the project is unviable.
It means the DPR was prepared too optimistically.
The revised project can become stronger by securing a multi-year feedstock agreement, validating gas yield, developing a seasonal storage strategy and treating Government assistance as upside rather than guaranteed income.
That is the difference between a promotional project report and a bankable DPR.
A strong DPR normally includes at least 10 years of financial projections.
The model should calculate revenue and expenditure at the plant level.
Major revenue heads may include:
Operating costs may include:
Financial expenses should separately calculate interest during construction and operating-period interest.
The model should then calculate:
A lender will usually give more importance to debt-servicing ability than to an attractive headline IRR.
Instead of searching only for “CBG subsidy,” promoters should build a complete financing structure.
A practical structure can contain 4 layers.
Promoter equity
This demonstrates the promoter’s commitment and funds the required equity portion.
Term loan
Debt may be explored through IREDA, public-sector banks, private banks or other eligible institutions.
Government assistance
Applicable GOBARdhan capital support can improve the project economics, but eligibility and timing need to be verified.
Working capital
Even after commissioning, the project needs liquidity for feedstock, electricity, manpower, maintenance and receivables.
Many DPRs focus on plant CAPEX but underestimate working-capital requirements.
That can become a serious problem during the first 6 to 12 months after commissioning.
A project becomes considerably easier to present to lenders when the promoter has already organized the main technical and commercial documents.
Important items normally include:
Banks may request additional documents depending on the project and borrower profile.
Financing and regulatory approvals should not be treated as separate exercises.
A lender may want evidence that the proposed land can legally accommodate the project.
The project may require applicable permissions relating to pollution control, factory operations, fire safety, storage, electricity and other local requirements.
For many projects, Consent to Establish becomes an important milestone before major construction.
The DPR should therefore contain a regulatory roadmap showing what approval is required, which authority is responsible and at what stage the application should be made.
Delays in approvals can increase interest during construction and reduce project returns.
Even a 6-month delay in commissioning can materially affect cash flow because the plant continues to incur financing and overhead costs while commercial revenue has not started.
No.
Government support can improve an already viable project, but the basic economics should make sense before subsidy.
Before making the investment decision, the promoter should be comfortable with 5 questions:
If the answer to several of these questions is still unclear, the project is probably not ready for financial closure.
Green Permits works with entrepreneurs, sugar mills, industrial groups and project developers during the early planning and investment stage of Bio-CNG projects.
Our work can cover feasibility assessment, Detailed Project Report preparation, financial modelling, funding-readiness analysis, approval planning and plant setup advisory.
A properly prepared DPR does more than show machinery and project cost.
It should answer whether the proposed plant can actually operate, whether the feedstock can support the selected capacity, how the project will generate revenue and whether the business can service debt after commissioning.
For a press mud CBG project, these decisions should ideally be taken before ordering major equipment.
India’s CBG ecosystem is becoming significantly stronger in 2026.
The new national framework with an announced ₹23,731 crore outlay, capital assistance of up to approximately ₹2 crore per TPD, increasing CBG obligations and access to renewable-energy financing can create attractive opportunities for press mud projects.
But Government support is only one part of project viability.
The strongest press mud Bio-CNG projects are those where feedstock, technology, offtake, finance and approvals have been planned together from the beginning.
A plant backed by reliable numbers has a far better chance of reaching financial closure than one built around the assumption that subsidy alone will make the project profitable.
📞 Planning a Press Mud Bio-CNG Plant?
Green Permits can support you with feasibility assessment, DPR preparation, financial modelling, funding strategy, approvals and plant setup planning.
Contact Green Permits Consulting
Phone: +91 78350 06182
Email: wecare@greenpermits.in
Website: www.greenpermits.in
