Explainer · Environmental Law
Environmental Clearance Disputes (2026)
Large projects in India, from mines and factories to highways and real estate above a size threshold, need a prior environmental clearance before work can begin. That clearance is often the flashpoint of a dispute: a project proponent wants it granted and upheld, while affected residents, activists and local bodies may challenge how it was given. The battleground is usually the National Green Tribunal. An environmental clearance dispute can be about a grant, a refusal, the conditions attached, or a project running without a clearance at all. This explainer sets out how clearances work, who can challenge them, the appeal route and its tight deadline, the common grounds, and what happens when a project skips the process. Last verified October 2026.
- The framework: prior environmental clearance is governed by the EIA Notification 2006 under the Environment (Protection) Act 1986.
- Who appraises: Category A projects centrally by the Union Ministry, Category B by the State SEIAA.
- The challenge route: an appeal to the National Green Tribunal under Section 16, within 30 days of communication, extendable by up to 60 days.
- Common grounds: a flawed impact assessment, poor public consultation, suppression of facts, and splitting a project to dodge appraisal.
- No clearance: operating without one is a serious violation, and the Supreme Court has disapproved of ex post facto clearance.
01What environmental clearance is
A prior environmental clearance is the permission a project must obtain before it can be built or expanded, so that its likely effect on the environment is studied and controlled in advance. It is governed by the EIA Notification 2006, issued under the Environment (Protection) Act 1986, which lists the projects that need clearance and sets the process for granting it.
The idea is prevention. Rather than cleaning up after damage, the system requires a project to assess its environmental impact first, consult the people who will be affected, and accept conditions to reduce the harm. Because the clearance decides whether a big project can go ahead, it attracts both strong backing from the proponent and strong opposition from those who fear the impact, and that tension is what produces disputes.
02How a clearance is granted
Under the EIA Notification 2006, projects are split into two categories, which decides who appraises them.
- Category A projects, the larger or more sensitive ones, are appraised centrally by the Union Ministry of Environment, Forest and Climate Change, advised by an Expert Appraisal Committee.
- Category B projects are appraised at the State level by the State Environment Impact Assessment Authority (SEIAA), advised by a State Expert Appraisal Committee.
The process generally runs through four stages: screening to decide what study is needed, scoping to fix the terms of reference for the environmental impact assessment, public consultation including a public hearing of affected people, and appraisal leading to a decision. Applications and documents are now filed through the Parivesh portal. A clearance, when granted, comes with conditions the project must follow.
03The kinds of dispute
Environmental clearance disputes come in a few recognisable shapes:
| Who is unhappy | What they challenge |
|---|---|
| Affected residents or activists | The grant of a clearance, saying the impact was understated or the process was flawed |
| A project proponent | A refusal of a clearance, or conditions that are too onerous |
| Regulators or complainants | A project operating without a clearance, or in breach of its conditions |
Each shape goes to the same main forum, the National Green Tribunal, but the relief sought differs, from quashing a clearance, to directing one to be granted, to stopping an unauthorised project and ordering restoration.
04The appeal to the NGT and its deadline
The main route to challenge an environmental clearance is an appeal to the National Green Tribunal under Section 16 of the NGT Act 2010, which covers an order granting environmental clearance. The deadline is strict: the appeal must be filed within 30 days of the date the order was communicated, extendable by up to 60 days for sufficient cause, so 90 days is the outer limit.
The deadline runs from when the clearance was communicated, not from when you happened to learn of it, and that date is often itself disputed.
A recurring fight is over when the clock starts. Authorities often argue that uploading the clearance on the official website amounts to communication, while an objector may say they learned of it much later. Because the limitation is read strictly, note every relevant date. For how to actually file and run a matter in the NGT, see how to file a case in the National Green Tribunal, and for the Tribunal's wider jurisdiction and the appeal onward to the Supreme Court, see how the National Green Tribunal works.
05Common grounds of challenge
Most challenges to a clearance rest on one or more of these grounds:
- A flawed impact assessment. The environmental impact assessment report was inaccurate, incomplete, copied, or understated the real impact.
- Inadequate public consultation. The public hearing was skipped, poorly notified, or held in a way that denied affected people a real chance to object.
- Suppression or misrepresentation of facts. The proponent hid relevant information, such as the true scale, location or prior violations.
- Splitting the project. A large project was broken into smaller parts to stay below a threshold and avoid full appraisal.
- Ignoring conditions or sensitive features. The appraisal overlooked a protected area, a water body or the cumulative impact of nearby projects.
The Tribunal weighs these against guiding principles such as sustainable development, the precautionary principle, and polluter pays. A clearance granted on a defective process can be set aside or sent back for fresh appraisal.
06Operating without a clearance
Some disputes are not about a flawed clearance but about no clearance at all, where a project started or expanded before getting one, or ran in breach of its conditions. This is a serious violation, and the Tribunal can order the activity stopped, impose compensation on the polluter pays principle, and direct restoration.
A connected and contested issue is ex post facto clearance, meaning a clearance granted after the project has already been built or operated. The Supreme Court has disapproved of regularising projects this way, holding that an after-the-event clearance runs against the precautionary principle at the heart of the regime. So a proponent who builds first and seeks clearance later cannot assume the breach will simply be papered over. For a related construction-stage approval dispute, see occupancy certificate disputes.
07Where Claw fits
Claw is an all-in-one legaltech platform for Indian advocates, law firms, and corporate legal teams, combining AI-based case search, an AI legal assistant (Legal GPT), case management, and compliance automation across all Indian courts and tribunals.
Whether a clearance survives a challenge turns on how the NGT and the courts have read the EIA process, public consultation and ex post facto clearance, and these matters move quickly between the Tribunal, the High Courts and the Supreme Court. Claw tracks NGT and environmental appeal matters across 9,102 courts, benches and forums, with alerts when a new order is passed or a hearing is listed, so you can follow a clearance dispute by the name of a project proponent, authority or advocate and never miss a date. You can also search 30 crore+ judgments, with Supreme Court decisions from 1950 and High Court decisions from 1990, returning results in under 5 seconds, to see how similar clearances have been upheld or set aside. Use a case search across Indian courts by party name to research a proponent or a project before you act. Claw does not use your searches or documents to train its AI models. A clean search means nothing was found on the forums covered on the date searched under the names you used, and this is general information, not legal advice.
08Sources and further reading
- Parivesh (environmental clearance applications and documents): parivesh.nic.in
- India Code (Environment (Protection) Act 1986; National Green Tribunal Act 2010): indiacode.nic.in
- National Green Tribunal (appeals, orders and cause lists): greentribunal.gov.in
- Claw: clawlaw.in
This explainer is general information, not legal advice. Clearance rules and thresholds change, and the facts of each project differ, so check the current notification and take advice from an environmental lawyer before you act.
09Frequently asked questions
How do I challenge an environmental clearance in India?
The main route is an appeal to the National Green Tribunal under Section 16 of the NGT Act 2010, which covers an order granting environmental clearance. You must file within 30 days of the clearance being communicated, extendable by up to 60 days for sufficient cause. You can argue that the impact assessment was flawed, the public consultation was inadequate, or facts were suppressed.
What is the time limit to appeal an environmental clearance?
Thirty days from the date the clearance order was communicated to you, under Section 16, extendable by up to 60 more days if the Tribunal is satisfied there was sufficient cause, so the outer limit is 90 days. The start date can itself be disputed, for example whether uploading the clearance on a website counts as communication.
What are the common grounds to challenge a clearance?
Common grounds include a flawed or incomplete environmental impact assessment, inadequate or skipped public consultation, suppression or misrepresentation of facts by the proponent, splitting a large project into smaller parts to avoid full appraisal, and ignoring sensitive features or cumulative impact. The Tribunal weighs these against the precautionary and polluter pays principles.
What happens if a project operates without environmental clearance?
It is a serious violation. The National Green Tribunal can order the activity stopped, impose compensation on the polluter pays principle, and direct restoration of the environment. The Supreme Court has disapproved of granting ex post facto clearance to regularise such projects, because an after-the-event clearance runs against the precautionary principle.
Who can challenge an environmental clearance?
Standing before the National Green Tribunal is read broadly, so affected residents, local bodies, activists and public-spirited persons can challenge a clearance, not only those who own affected property. A project proponent, in turn, can appeal a refusal or onerous conditions. The relief sought depends on who is challenging and why.