Green belt at thermal power plants: rules and design

7 October 2026 4 min read Grow Billion Trees team

Thermal power plants are Red category industries, and their green belt is set in the environmental clearance. Under MoEFCC's 29 October 2025 office memorandum, new standalone Red units in predominantly air-polluting sectors are referred to a 25% minimum, and 40% in critically or severely polluted areas. Expansions are decided case by case, and many recent clearances still carry a 33% condition.

What green belt do thermal plants usually carry?

Standardised EC conditions issued in 2018 and 2019 set a 33% green belt for most sectors. Many thermal plants carry that condition today.

A May 2025 MoEFCC clearance for a 1,600 MW coal plant expansion in Madhya Pradesh is a typical example. It records 33.10% of the plant area as green belt.

The same letter specifies a 5-50 m wide belt with at least three tiers around the boundary, as per CPCB guidelines. It asks for local and native species at 2,500 trees per hectare.

What changed in October 2025?

On 29 October 2025, MoEFCC issued an office memorandum (OM) that rationalised green belt needs by pollution potential.

CPCB's 2016 classification puts thermal power plants in the Red category, and among the 17 categories of highly polluting industries.

Situation	Minimum green belt (Red category)
Standalone unit, predominantly air-polluting sector	25%
Standalone unit, other sectors	20%
Red or Orange unit in a critically or severely polluted area	40%
Unit inside a new greenfield industrial estate	15% of premises
Expansion, modernisation or product-mix change	Case by case by the Expert Appraisal Committee

The OM applies to new EC applications and those under consideration. The sectoral Expert Appraisal Committee sets the final figure in EC conditions, so read yours first.

What else does the OM ask for?

Watering and protection for at least five years, then sustained care.
Native, pollution-tolerant species, mixing evergreen and deciduous trees.
Multi-tier planting, placed near pollution sources and across the main wind direction.
Half-yearly green belt reports with the environmental statement.
Optional ex-situ planting with State Forest Departments or urban local bodies.

How should a thermal plant design its green belt?

Plan around coal, ash and water

Coal yards, conveyors, ash handling and cooling systems create dust and moisture patterns. Put the densest tiers between these sources and nearby villages.

Keep fire and electrical clearances

Leave safe gaps near switchyards, transmission corridors and coal stockpiles. Use shrubs and low trees where height is a hazard.

Prepare the soil

Plant sites often have compacted or ash-mixed soil. Pit preparation, organic matter and mulching decide survival more than species choice.

Irrigate through the dry season

Treated wastewater, where permitted, and drip lines help belts survive summer. Budget for this across the five-year care period.

Fill gaps every year

Count survivors after each monsoon and replant gaps. Report survival honestly; inspectors check living trees, not planting numbers.

Why do thermal plant green belts fall short?

Area counted on paper includes roads, open ground or dead trees.
Planting was done once for an inspection and never maintained.
Single-species rows died together from pests or drought.
No one tracked survival, so gaps went unnoticed for years.

Each of these is avoidable with a care plan, a gap-filling budget and simple geo-tagged records.

What about ash ponds and colony areas?

Stabilised ash ponds can be reclaimed with green belt or plantation under the fly ash notification. See our guide on ash pond and dyke reclamation.

Township and colony areas suit Miyawaki forests and urban forests that employees and families use.

How does the green belt show up in reporting?

Area, tree count, species and survival go into the half-yearly environmental statement. The same data supports BRSR Principle 6 disclosures.

For rules and species across all sectors, see our green belt development guide.

How Grow Billion Trees helps

We plan, plant and care for tiered green belts at thermal plants, including soil preparation, irrigation and gap-filling, and supply the records your reports need. See our power sector page. We geo-tag every tree, report on GreenTrack, and hold to 85% survival across our programmes. Projects are priced per project after a site survey; you can plan a programme with our team.

Further reading: Green belt at refineries and petrochemical complexes · Green Belt and Water Restoration for Chemical and Textile Clusters

Frequently Asked Questions

Do thermal power plants still need a 33% green belt?

Many existing ECs carry 33%. For new and pending EC applications, the October 2025 OM refers standalone Red units in predominantly air-polluting sectors to 25%, and 40% in critically or severely polluted areas.