Loading...
Loading...
Law Update
Quick note
Below is the official summary and the reference document preview. Use “Open PDF” for full screen view.
The Meghalaya State Pollution Control Board (MSPCB) has issued a circular dealing with emissions from diesel generator sets that are already in operation across the State. The direction is particularly relevant for factories, commercial establishments, buildings, projects, utilities and infrastructure facilities that continue to depend on DG sets for backup or regular power support.
The circular does not put every diesel generator into one category. Capacity, age, operating hours and the emission standard applicable to the genset all matter.
For certain in-use DG sets up to 800 kW, the Board has referred to the use of a certified Retrofit Emission Control Device (RECD) with at least 70% particulate matter capture efficiency. Other routes mentioned include shifting to gas-based generators, using gensets that meet newer emission norms and adopting suitable air pollution control equipment for larger DG sets.
Businesses therefore need to identify the category of each DG set before deciding what needs to be changed.
| Particular | Details |
| Issuing Authority | Meghalaya State Pollution Control Board |
| Document Type | Circular |
| Subject | Retrofitting of Operational DG Sets for Emission Control in the State of Meghalaya |
| State | Meghalaya |
| Main Equipment Covered | Operational Diesel Generator Sets |
| RECD Efficiency Mentioned | At least 70% particulate matter capture efficiency |
| RECD Capacity Category | In-use DG sets up to 800 kW, subject to stated conditions |
| Age Condition | More than five years from the date of manufacture |
| Useful Life | 15 years from manufacture or 50,000 operating hours, whichever is earlier |
| Other Compliance Options | Gas-based generators, newer compliant gensets and suitable APCDs |
| Larger DG Sets | Separate requirement for DG sets above 800 kW |
| Consent Requirement | DG sets of 1000 kVA and above |
| Compliance Deadline | Not expressly specified in the circular |
| Non-Compliance | Action under applicable environmental laws, including environmental compensation |
The circular is best read as a category-based emission-control direction. It does not say that every DG set must be treated in the same manner.
Diesel generators are used widely where an uninterrupted power supply is necessary. A factory may rely on one during a power cut. A hotel may use it to keep essential systems running. Airports, railway stations, construction projects, utilities and large buildings may also operate DG sets as backup sources.
The pollution concern comes from the exhaust.
Diesel engines can release particulate matter and other pollutants into the air. When a large number of old generators continue operating without suitable emission-control systems, they can add to local air-pollution levels.
The MSPCB circular links this issue with directions of the National Green Tribunal (NGT) and the broader objectives of the National Clean Air Programme (NCAP).
The approach is not limited to replacing old generators. Retrofitting existing equipment has also been recognised as one way of reducing particulate emissions.
The Meghalaya circular does not operate in isolation. It refers to earlier national-level directions, emission standards and CPCB procedures.
National Green Tribunal Direction
MSPCB refers to the NGT matter OA No. 681/2018 and an order dated 6 August 2019 concerning measures for controlling urban air pollution.
DG sets are mentioned as one of the sources of air pollution that require emission-control measures.
MoEFCC Emission Standards
The circular also refers to notifications issued by the Ministry of Environment, Forest and Climate Change relating to DG-set emission standards, including:
These references form part of the wider emission-control framework for diesel generator engines.
National Clean Air Programme
The NCAP aims at prevention, control and reduction of air pollution. Within that wider approach, existing diesel generators are also considered a source that needs attention.
For operational DG sets, the circular refers to two broad NCAP-linked options:
CPCB RECD Certification Procedure
The Central Pollution Control Board has also issued a system and procedure for emission-compliance testing of RECDs used with diesel power-generating engines up to a gross mechanical power of 800 kW.
This part matters for businesses because an emission-control device should not be selected simply on the basis of a vendor's marketing claim. The certification and capacity suitability of the equipment need to be checked.
The direction is relevant to operators of DG sets within Meghalaya.
The circular refers to DG sets used in places such as:
Still, the compliance requirement cannot be decided only by looking at the type of establishment.
The DG set itself needs to be examined.
Businesses should check:
A business with several generators may find that different units fall into different categories.
The most commercially relevant part of the circular concerns in-use DG sets up to 800 kW.
For the RECD route, the circular refers to DG sets that are:
Where these conditions apply, the circular refers to a certified RECD from CPCB-approved manufacturers with 70% efficiency for capturing particulate matter.
This is why businesses should avoid treating the words "RECD required" as a blanket rule.
The correct question is:
Does this particular DG set fall within the capacity, age and useful-life conditions mentioned by MSPCB?
An RECD, or Retrofit Emission Control Device, is an emission-control system fitted to a diesel generator that is already in operation.
It is called "retrofit" because the device is added later rather than being part of the original generator when it leaves the factory.
Its job is to reduce particulate matter leaving the DG-set exhaust.
For an operator, the regulatory issue is not only whether an RECD is installed. The equipment also needs to satisfy the certification and performance conditions applicable to the generator.
That makes RECD Compliance Support different from simply buying an emission-control product. Capacity matching, certification and supporting technical records have to be considered together.
The MSPCB circular refers to a minimum specified particulate matter capture efficiency of at least 70% for the relevant RECD.
In simple terms, the device should be capable of capturing at least the required proportion of particulate matter from the DG-set exhaust under the applicable certified conditions.
There is one distinction businesses should keep clear:
70% particulate matter capture does not mean a 70% reduction in every type of emission produced by a diesel engine.
The figure mentioned in the circular is specifically linked to particulate matter.
Before accepting an RECD as suitable, businesses should therefore check:
The five-year condition is easy to misunderstand.
The circular refers to certified RECDs for specified in-use DG sets that are older than five years from the date of manufacture.
That does not mean a DG set becomes unusable after five years.
The circular separately talks about the generator's useful life.
The two conditions are different:
Age condition:
More than five years from the date of manufacture.
Useful-life condition:
Up to:
15 years from the date of manufacture; or
50,000 operating hours,
whichever is earlier.
So, a generator becoming five years old and a generator reaching the end of its useful life are not the same event.
This distinction should be checked before any retrofit decision is made.
The circular uses two measurements to determine useful life.
A DG set may remain within the stated useful-life period until the earlier of:
The phrase "whichever is earlier" is the controlling condition.
For this reason, businesses should not rely only on the year printed on a purchase invoice.
Useful records may include:
These records can become useful when carrying out a DG Set Emission Compliance Assessment.
The circular provides more than one route for controlling DG-set emissions.
Option 1: Use a Certified RECD
For the relevant category of in-use DG sets up to 800 kW, a certified RECD with at least 70% particulate matter capture efficiency can be used.
Option 2: Shift to a Gas-Based Generator
Businesses can move from a conventional diesel generator to a new gas-based generator.
Option 3: Retrofit an Existing Generator for Partial Gas Use
The circular also recognises retrofitting an existing DG set for partial gas usage.
Option 4: Shift to a Genset Meeting Newer Emission Norms
Operators may move to gensets meeting the emission norms referred to under GSR 804(E) dated 3 November 2022.
Option 5: Use a Suitable APCD for Larger DG Sets
For DG sets above 800 kW, the circular refers to suitable Air Pollution Control Devices, subject to compliance with the applicable emission standards.
These are alternative compliance approaches based on the category of DG set. Businesses should not assume that every option needs to be implemented together.
Yes. Gas-based generation is one of the options specifically mentioned.
This may involve:
For some facilities, this could be worth evaluating alongside RECD installation or replacement of the existing generator.
However, the circular does not provide:
Those issues would need a separate technical and commercial assessment.
Another route is to shift to gensets meeting the newer emission norms referred to in GSR 804(E) dated 3 November 2022.
This may be commercially relevant where an old DG set has little useful life left or where retrofitting is technically difficult.
The circular does not say that replacement is compulsory for every older generator.
A business may need to compare:
That comparison is a business decision, while the final compliance option still needs to fit the regulatory conditions.
MSPCB treats DG sets above 800 kW separately.
For this category, the circular refers to adopting a suitable Air Pollution Control Device (APCD) while complying with the emission standards notified under GSR 489(E) dated 9 July 2002.
This point matters because RECD and APCD should not be used as interchangeable terms.
RECD
A Retrofit Emission Control Device is specifically discussed for the relevant in-use DG-set category up to 800 kW.
APCD
Air Pollution Control Device is the broader term used in the circular for DG sets above 800 kW, subject to applicable emission standards.
Owners of large DG sets should therefore carry out a separate technical and regulatory review instead of applying the up-to-800-kW RECD provision mechanically.
There is another threshold in the circular that businesses should keep separate from the 800 kW limit.
MSPCB states that DG sets of 1000 kVA and above are to be regulated under the Consent Regime under the Air (Prevention and Control of Pollution) Act, 1981.
For operators in this category, the compliance review should therefore include their pollution-control consent position.
Areas that may need checking include:
The circular does not establish a new stand-alone CTE or CTO process for DG sets. It states that generators at or above the specified capacity fall under the existing Air Act consent regime.
A Pollution Control Consent Consultant can therefore be useful where the technical installation and the establishment's existing consent records do not match clearly.
This distinction deserves separate attention.
The circular uses:
kW and kVA measure different electrical values.
Because of this, businesses should not simply treat 800 kW as equal to 1000 kVA.
The correct rating should be taken from the generator's technical specifications, nameplate and related documentation.
Where conversion is necessary for engineering purposes, it should be based on the actual technical parameters of the equipment rather than an assumed regulatory conversion.
RECD installation can involve a meaningful capital expense. Choosing the wrong device first and checking compliance later can create an avoidable problem.
Businesses should therefore verify the technical and regulatory position before purchase.
Check the following:
These checks can form part of professional RECD Compliance Support before a business commits to a particular device.
The circular does not prescribe a formal seven-step application procedure. Still, operators can use a practical internal process to decide what needs to be done.
Step 1: Make a List of Every DG Set
For each generator, record:
Step 2: Divide DG Sets by Capacity
Identify whether each unit falls into:
Step 3: Check the Age
Determine whether the generator is older than five years from its date of manufacture.
Step 4: Check Remaining Useful Life
Compare:
The earlier of 15 years or 50,000 hours is relevant to the useful-life condition stated in the circular.
Step 5: Identify the Suitable Compliance Route
Depending on the category, consider:
Step 6: Verify Certification Before Purchase
Check the regulatory status of the proposed RECD or other pollution-control equipment.
Step 7: Review Consent Position
This becomes particularly relevant for DG sets of 1000 kVA and above.
Step 8: Keep Evidence Ready
Maintain technical and compliance records so that the facility can demonstrate what equipment is installed and why the selected route was considered applicable.
The effect of the circular will vary depending on how extensively a business depends on DG sets.
Manufacturing Units
Factories may have multiple DG sets of different capacities and ages. A unit-by-unit review is more useful than applying one compliance measure across the entire site.
Hotels, Hospitals and Commercial Buildings
These establishments often depend on backup power for essential systems. Older DG sets may need technical review for RECD applicability or alternative emission-control options.
Infrastructure Facilities
Airports, railway facilities, utilities and large projects may operate high-capacity generators. The requirements for generators above 800 kW and the 1000 kVA consent threshold therefore deserve particular attention.
MSMEs
For an MSME with an older generator, the practical question may be whether it makes more sense to retrofit the existing equipment or plan for replacement.
There is no single answer because remaining useful life, utilisation and technical condition can differ widely.
The circular is short, but implementation may still require technical work.
Selecting the Correct Equipment
An RECD should match the generator's category and certification requirements.
Finding Reliable Technical Records
Older DG sets may have incomplete manufacturing or operating-hour records.
Retrofit vs Replacement Decision
A generator close to the end of its useful life may require a different commercial decision from a relatively newer unit.
Downtime
Installation or conversion work may require temporary shutdown of backup-generation equipment.
Maintenance
Emission-control equipment also needs to remain functional after installation.
Consent Review
Larger DG sets may require closer examination of existing Air Act consent records.
The MSPCB circular does not prescribe a fixed RECD price, installation charge or standard compliance cost.
Any price quoted by a supplier is therefore a commercial quotation, not a fee fixed by MSPCB.
The Board states that failure to comply can lead to action under the relevant provisions of the Air (Prevention and Control of Pollution) Act, 1981 and the Environment (Protection) Act, 1986.
The circular also refers to the levy of environmental compensation.
However, the circular does not state a fixed environmental compensation amount.
It would therefore be incorrect to publish a standard penalty figure and present it as applicable to every DG-set operator.
The practical concern for businesses is simpler: once the applicability of the direction is established, the compliance position should be documented rather than left unresolved.
Both sides need to be considered.
| Environmental and Regulatory Benefit | Business Concern |
| Reduces particulate matter from older DG sets | Retrofit equipment creates additional cost |
| Addresses emissions from equipment already in service | Retrofit equipment creates additional cost |
| Allows retrofit instead of immediate replacement in suitable cases | Certification has to be verified |
| Provides alternatives such as gas-based generation | Fuel and infrastructure availability may affect feasibility |
| Brings larger DG sets within a clearer pollution-control approach | Consent and documentation work may increase |
From an environmental point of view, controlling emissions from older DG sets is understandable because these generators may remain in operation for years.
From a business point of view, the cost cannot be ignored. An establishment may need to spend on retrofit equipment, replacement, gas conversion, maintenance or regulatory compliance.
The sensible approach is to avoid making a purchase first and asking compliance questions later.
Businesses can use the following checklist before finalising their response to the MSPCB direction.
Basic DG Set Details
Applicability Review
Emission-Control Review
Documentation
The checklist is a practical internal control tool. The circular itself does not prescribe this exact document format.
A business does not need to begin by replacing its generator. It needs to begin by finding out exactly what it owns.
The immediate priorities should be:
The circular does not expressly mention a final compliance deadline. That should be stated accurately rather than adding an assumed date.
Understanding the circular is one part of the work. Applying it to an actual generator is where many businesses can face difficulty.
Corpseed's DG Set Emission Compliance Services can assist businesses with the regulatory and documentation side of this process.
1. DG Set Applicability Assessment
Corpseed can review available details such as:
The objective is to identify which MSPCB requirement is relevant before the business spends money on a particular solution.
2. RECD Compliance Support
For businesses considering retrofit equipment, Corpseed can assist in reviewing:
This helps keep the regulatory review separate from an equipment supplier's commercial sales process.
3. Environmental Compliance Gap Assessment
A facility may already have some of the required information but still have gaps in its compliance file.
Corpseed's Environmental Compliance Services can help identify missing areas relating to:
4. Pollution Control Consent Support
DG sets of 1000 kVA and above require particular attention because MSPCB places them under the Air Act consent regime.
As a Pollution Control Consent Consultant, Corpseed can assist with reviewing the consent position and supporting documentation where filing or regulatory action is required.
5. Technical Documentation Review
The compliance file may need to bring together documents held by several departments.
Corpseed can assist in organising:
6. MSPCB Compliance Support
Where the business is unsure how the circular applies to its equipment, an MSPCB Compliance Consultant can help map the technical facts of the DG set against the regulatory conditions.
7. Ongoing Pollution Control Compliance
DG-set compliance may form only one part of a facility's environmental obligations. Corpseed can also support relevant Pollution Control Compliance Services, including consent-related and environmental regulatory documentation where applicable. For a business operating older or high-capacity generators, the value of professional DG Set Emission Compliance Services lies in checking applicability first, reviewing the technical evidence and then preparing the correct regulatory response.
The MSPCB circular puts the focus on pollution control for DG sets that are already operating in Meghalaya.
The main points businesses should retain are:
Document Preview
Embedded reference document