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Techno-Economic Viability Study in India
Every other page on this site answers "what is it worth today." This one answers a harder question: will it work at all? A TEV study tests whether a project is technically sound and financially self-sustaining before a lender commits real money to it — and since October 2025, it's a legal requirement above a specific exposure threshold, not just good banking practice.
Why viability isn't a single number
Projects rarely earn full revenue from day one of operations. A TEV study has to model the ramp-up, not just the eventual steady state.
Illustrative shape only — not a projection for any real project. Actual ramp-up depends on sector, offtake contracts, and commissioning risk.
What is a techno-economic viability study?
An independent assessment of whether a proposed project is both technically achievable and financially self-sustaining — covering the technology or process chosen, the promoter's capability to execute it, realistic demand and revenue assumptions, and whether the resulting cash flows can actually service the debt being proposed. It's the diligence a lender does before committing, not after.
Under RBI's current framework, a project qualifies as "project finance" when at least 51% of debt servicing is expected to come from the project's own cash flows, and all lenders sign a common loan agreement — that definition is what pulls a project into TEV territory in the first place.
The framework, briefly
When a TEV study is legally required
RBI (Project Finance) Directions, 2025 mandate a TEV study wherever aggregate lender exposure to a project reaches ₹100 crore or more — at sanction, and again if the DCCO or appointed date is later revised, since that revision requires a fresh viability assessment before lenders can agree a supplementary disbursement arrangement. Below ₹100 crore, individual lender policy governs, but most credit committees still expect one for anything genuinely complex.
COD and DCCO — two names, related purposes
Commercial Operations Date (COD) is the term used in power-purchase agreements and concession contracts for when a project actually starts operating. DCCO is RBI's own regulatory anchor — drawn from the same milestone — used specifically to determine provisioning and income-recognition treatment on the lending side. A TEV study and its later COD certification feed directly into whether an account stays classified as standard.
Multi-lender exposure and consortiums
For exposures up to ₹1,500 crore, each lender in a consortium must hold at least 10% of total debt; above that, the floor is ₹150 crore or 5%, whichever is higher. A shared, credible TEV study is what lets a consortium actually rely on one another's underwriting instead of duplicating it.
Renewable energy land and right-of-way
Utility-scale solar typically needs roughly 4–5 acres per MW; wind needs a larger spread for turbine spacing but a smaller actual footprint, often allowing continued agricultural use around towers. Transmission right-of-way compensation is governed by the Indian Telegraph Act, the Electricity Act, 2003, and technical standard IS 5613 — and Ministry of Power land-compensation guidelines only apply to lines built after October 2015, which matters when a project's evacuation infrastructure predates that cutoff.
When you actually need this
Project finance sanction
Mandatory once aggregate lender exposure reaches ₹100 crore.
DCCO or appointed-date revision
A fresh TEV is required before lenders can agree the supplementary arrangement.
Solar or wind project land
Assessing land, lease terms, and evacuation right-of-way before financial closure.
Toll or infrastructure revenue studies
Independent traffic or usage projections behind a concession's revenue case.
Techno-commercial due diligence
Investor or acquirer diligence on a project's technical and commercial soundness, outside a lending context.
COD certification
Confirming the milestone that shifts a project from construction-phase to operating-phase treatment.
What a proper TEV study actually covers
- Technical feasibility — the technology, process, or design chosen, and whether it's proven at this scale
- Market and demand assessment, including offtake or revenue contracts where they exist
- Financial viability — projected cash flows, debt service coverage ratio, and internal rate of return
- Promoter and management capability to actually execute the project
- Status of statutory, environmental, and land-related clearances
- Sensitivity analysis against realistic downside scenarios, not just the base case
What separates a real TEV study from a formality
- Demand assumptions are checked against comparable projects, not just the promoter's own projections
- A genuine downside case is modelled, not a base case with a token haircut
- Land and right-of-way status is verified on the ground, not assumed from paperwork alone
- Repayment tenor proposed actually fits within the 85%-of-economic-life cap
TEV study vs. the neighbours
| Lender's Independent Engineer | The project is already sanctioned and you need ongoing disbursement monitoring, not the upfront study. |
| Property Valuation | You need a value opinion on existing land or a building, not a feasibility assessment of a proposed project. |
| Company Act Valuation | The question is what an existing business is worth, not whether a new project will work. |
Where a rushed TEV study goes wrong
- Revenue ramp-up assumed to be immediate rather than gradual
- Land or right-of-way status taken from documents alone, not verified on site
- No fresh TEV commissioned when the DCCO actually shifts, leaving lenders exposed on outdated assumptions
- Sensitivity analysis limited to a single mild downside instead of a genuine stress case
Glossary
| TEV | Techno-Economic Viability — a combined technical and financial feasibility assessment. |
| DSCR | Debt Service Coverage Ratio — project cash flow available divided by debt obligations due, a core lender metric. |
| IRR | Internal Rate of Return — the discount rate at which a project's projected cash flows break even against its cost. |
| COD | Commercial Operations Date — when a project actually begins operating, per its PPA or concession agreement. |
| DCCO | RBI's regulatory version of the same milestone, used for provisioning and income-recognition purposes. |
| Right-of-way (RoW) | Legal access across land needed for transmission lines or pipelines, separate from owning the land itself. |
| Appointed date | In PPP projects, the formal start date before which fund-based disbursement isn't permitted. |
| Credit event | The broadened trigger under RBI's 2025 Directions that requires lenders to begin collective resolution. |
Frequently Asked Questions
What is a techno-economic viability study?
An independent assessment of whether a proposed project is technically achievable and financially self-sustaining, done before a lender commits funds.
When is a TEV study legally mandatory?
Under RBI's Project Finance Directions, 2025, wherever aggregate lender exposure to a project reaches ₹100 crore or more.
Do I need a fresh TEV if my project timeline changes?
Yes, if the DCCO or appointed date is revised on a project at or above the ₹100 crore threshold, a fresh study is required before lenders can agree the change.
How much land does a solar or wind project actually need?
Utility-scale solar typically needs roughly 4–5 acres per MW; wind needs more spread for spacing but a smaller physical footprint, often allowing dual land use.
What's the difference between a TEV study and LIE monitoring?
The TEV study is the upfront feasibility assessment before sanction; the LIE then monitors the project's actual progress against that assessment through construction.
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