Is your diesel generator actually compliant, or are you relying on an assumption? RECD compliance for diesel generators should be verified through the generator's technical details, applicable requirements, product documentation and installation records rather than through a generic “CPCB approved” label.
For businesses, hospitals, commercial buildings, manufacturing facilities and other establishments operating diesel generator sets, understanding the difference between an applicable RECD solution and a general emission-control product is important. CPCB has published a technical procedure for compliance testing of Retrofit Emission Control Devices (RECDs) for diesel power-generating-set engines up to 800 kW gross mechanical power. But does that mean every DG set has exactly the same RECD requirement? No. The applicability needs to be checked against the specific generator, engine, power range, phase and current regulatory requirements.
What Does “RECD Compliant” Actually Mean?
RECD stands for Retrofit Emission Control Device.
The term generally refers to a retrofit emission-control device intended for an existing diesel genset engine. CPCB's published framework establishes a procedure for evaluating such devices rather than treating every emission-control product as automatically acceptable.
This distinction matters.
A supplier may sell an exhaust-emission-control product, but the buyer should still establish:
What is the exact RECD model?
Which engine-power range is it designed for?
Which phase does it cover?
What certification or test documentation is available?
Does it match the particular DG-set application?
What installation conditions apply?
Compliance should therefore be treated as a product-plus-application-plus-regulatory verification exercise.
Is RECD Mandatory for Every Diesel Generator?
This is one of the most common questions.
It is risky to answer it with a simple “yes” or “no” without examining the specific generator and applicable requirements. CPCB's published RECD manufacturer list identifies products for different ranges of in-use diesel genset engine power, with separate Phase I and Phase II applicability. The published list covers engines up to 800 kW. That means the first step is to determine where your generator falls within the applicable framework.
Before making a purchase decision, verify:
Engine manufacturer
Engine model
Gross mechanical power in kW
Applicable phase
Current CPCB requirements
Relevant SPCB/PCC requirements
Site-specific directions, if applicable
This is much safer than assuming that one rule applies identically to every DG set in India.
Why Engine Power Matters
Generator capacity is commonly expressed in kVA, while CPCB's published RECD information identifies applicability using engine power in kW. For example, a facility manager may describe a generator as a “500 kVA DG set.” However, the supplier may need the engine's gross mechanical power and exact engine model to determine whether a particular RECD is appropriate. Therefore, collect the technical information from the engine nameplate, manufacturer's documentation or other reliable records.
Your basic equipment record should include:
DG-set manufacturer
Engine manufacturer
Engine model
Engine serial number
Gross mechanical power
Generator rating
Manufacturing information
Exhaust configuration
The more accurate this information is, the easier it becomes to evaluate an RECD proposal.
What Are Phase I and Phase II?
CPCB's published RECD manufacturer list distinguishes between Phase I and Phase II applicability for listed RECD products. This is important when reviewing a supplier's documentation. Do not assume that because an RECD is suitable for one phase, it automatically applies to another.
Instead, ask the supplier to identify:
The exact phase applicability of the proposed RECD and the documentation supporting that applicability.
The answer should correspond with the technical characteristics of your DG set.
What About RECD Deadlines?
The word “deadline” can be misleading when discussing DG-set compliance. There should not be an assumption that there is one universal deadline applicable in exactly the same way to every diesel generator, regardless of engine, location and regulatory circumstance.
CPCB's published materials provide technical and certification information for RECDs, while the applicable compliance position for a particular installation may also depend on the relevant regulatory directions and local authority requirements.
Therefore, before acting on a claimed deadline:
Verify the source.
Ask:
Which notification establishes the requirement?
Which DG sets does it cover?
What power range is specified?
Which phase applies?
Does it apply to existing or new equipment?
Is there a state-specific direction?
Has the requirement been updated?
If a supplier or consultant says, “Your DG set must have an RECD by this date,” ask for the official reference supporting the statement.
This simple step can prevent unnecessary or incorrectly timed purchases.
How Can You Check Your DG Set?
A practical compliance review can begin with five questions.
1. What engine do you have?
Record the manufacturer and exact model.
2. What is its gross mechanical power?
Record the power in kW rather than relying only on kVA.
3. Which phase applies?
Confirm the relevant Phase I or Phase II category where applicable.
4. Is the proposed RECD documented for that application?
Check the manufacturer, model, power range and certification information.
5. What requirements apply at your location?
Review the latest CPCB information along with applicable State Pollution Control Board or Pollution Control Committee requirements.
Check CPCB's Published Manufacturer Information
CPCB publishes a list of manufacturers certified for RECDs applicable to diesel genset engines up to 800 kW. The published document identifies manufacturers, applicable engine-power ranges, Phase I/Phase II applicability and certification agencies. This makes the CPCB list a useful reference point during product evaluation.
However, the list should not be treated as a substitute for checking the specific product and generator application.A manufacturer may have different products covering different power ranges or phases. Therefore, identify the actual product being offered.
Don't Confuse DG Engine Compliance With RECD Compliance
Another important distinction is between the emissions compliance of the original diesel engine/genset and the certification or applicability of a retrofit device. CPCB separately publishes information concerning diesel engine/genset emission compliance, including type approval and Conformity of Production (COP) information. Therefore, an engine's existing certification and an RECD's certification are not necessarily the same thing. When reviewing documents, determine exactly what each document refers to.
What Should Generator Owners Do Now?
Instead of immediately ordering an RECD based on a deadline mentioned by a third party, start with a technical audit of your existing generator fleet. Collect the engine information, identify the applicable power range, determine the relevant phase and review the current CPCB information.
Then obtain proposals from technically capable suppliers and compare the exact products rather than comparing generic “RECD” quotations. If your site is subject to specific directions from a State Pollution Control Board, Pollution Control Committee or another competent authority, include those requirements in the evaluation.
Conclusion
The question “Is my diesel generator RECD compliant?” cannot always be answered simply by checking whether an RECD has been installed. A proper evaluation should connect the generator, engine, power range, phase, RECD product, certification information, installation and applicable regulatory requirements. CPCB's published RECD information identifies certified manufacturers and specific applicability ranges for diesel genset engines up to 800 kW, including Phase I and Phase II classifications. At the same time, CPCB separately maintains information relating to diesel engine/genset emission compliance and type approval/COP, so buyers should understand what each document actually establishes. For businesses searching for an RECD manufacturer in India, the safest approach is to evaluate product-specific documentation and technical suitability rather than relying on a generic certification statement.