- October 1, 2026
- Posted by: Aceget
- Category: RECD & Emission Control Devices
A factory usually has one generator room. A university has generators scattered across a hundred acres, bought over thirty years by a dozen departments, each with its own budget head and its own idea of who maintains it. When the emission rules for NCR changed, most estate offices discovered they did not even have a complete list of their DG sets.
That is the real starting point for any plan around an RECD for university campus use. The question is not “which device should we buy?” It is “what do we own, where is it, how hard does it work, and which set should we fix first?” This guide treats the campus as a fleet and walks through the portfolio method: register, classify, score, procure, govern, phase and monitor.
If you are new to the hardware itself, start with our explainer on what an RECD is and how it works, then come back here for the campus planning side.
Why a Campus Is a Fleet, Not a Generator
Walk around any large university in Delhi NCR and count the exhaust stacks. You will typically find DG sets serving very different loads with very different consequences when power fails:
- Hostels: lighting, fans, water pumps and lifts for hundreds of residents, with heavy evening and night demand.
- Academic blocks: classrooms, lecture theatres and faculty offices, busy on weekdays and nearly empty on Sundays.
- Research labs: ultra-low temperature (-80°C) freezers, incubators, fume hoods and instruments that cannot lose power for long without losing years of samples.
- Animal house: ventilation and climate control that must run continuously for animal welfare and regulatory reasons.
- Campus hospital or health centre: emergency care, a small OT or a pharmacy cold store.
- Data centre or server room: the campus network, ERP, exam portal and learning management system.
- Water works and sewage treatment: borewell pumps, overhead tank transfer pumps and STP blowers.
- Guest house, sports complex and staff quarters: smaller sets, often old, often forgotten.
Some run daily during load shedding, some run twice a year for a test. Some are 30 kVA, some are 1010 kVA. Treating them all alike wastes money on idle sets and delays the ones that matter.
A fleet view shows total compliance exposure, lets you sequence work so critical loads always keep backup, and lets you standardise and negotiate similar retrofits together.
Step 1: Build a Campus DG Asset Register
You cannot manage what you have not listed. The first deliverable for the estate office is a single DG asset register, kept as a shared spreadsheet or inside your facility management software, with one row per set.
Here are the fields we suggest capturing. Most can be filled during a two or three day walk-round by a junior engineer with a phone camera.
| Field | What to record | Why it matters |
|---|---|---|
| Asset tag | A unique code such as DG-HST-03 | Ends confusion between “the hostel generator” and “the other hostel generator” |
| Location | Building, plant room, GPS pin | Needed for survey routing and inspection |
| Rating (kVA and kW) | From nameplate, not memory | Decides the CAQM band and the device size |
| Make, engine model, alternator | Engine and alternator separately | Drives exhaust flow and backpressure limits |
| Year of manufacture | Nameplate or purchase records | Older engines may need an overhaul first |
| Hour meter reading | Current reading plus date | Shows how hard the set really works |
| Load profile | Typical and peak load, in % of rating | Affects DPF regeneration behaviour |
| Owner department | Estate, hostel office, a research centre, hospital | Decides who approves and who pays |
| Budget head | Capital, maintenance, project grant | Some grants restrict spending on infrastructure |
| Exhaust route | Pipe size, length, bends, height, roof or wall exit | Decides where the RECD can sit |
| Nameplate photos | Engine, alternator, canopy | Needed by any vendor for a correct quote |
| CAQM band | Derived from kW rating | First filter for the route decision |
| Consent and NOC status | Current CTO, stack details | Inspectors ask for this |
| Remarks | Smoke, leaks, noise complaints | Flags sets for repair or retirement |
Photograph nameplates properly, because blurry photos are a common reason quotes go wrong. Our guide on DG nameplate photos for an RECD enquiry shows exactly which shots to take. Also record every hour meter on one date, then again a month later; the difference shows real usage.
Step 2: Classify Each Set into a CAQM Band and Choose a Route
Once the register is complete, add a column for the CAQM band. Under CAQM Direction No. 76 (29 September 2023), the broad framework for NCR is:
- 19 to 125 kW: move to dual fuel (gas plus diesel).
- 125 to 800 kW: dual fuel or an RECD.
- Above 800 kW: RECD.
Note that the bands are in kW, while most campus records list kVA. At a typical 0.8 power factor, kW is roughly 0.8 times kVA, so a 160 kVA set is about 128 kW and a 1010 kVA set is about 808 kW. Always confirm against the nameplate and check the current CAQM direction and your SPCB, since timelines and interpretations have been revised before. Our page on DG set emission regulations summarises the framework.
The band is only the first filter. For each set, the estate team should pick one of five routes:
- RECD retrofit: fit a certified retrofit emission control device on the existing set. Suits sets in good condition with real run hours.
- Dual fuel: fit a dual fuel kit where gas supply is available or planned. Mandatory direction for the smallest band, an option for the middle band.
- Replace: buy a new compliant set when the old engine is near end of life and a retrofit would be money spent on a failing asset.
- Retire: decommission sets that no longer serve a real load, for example a block that has been rewired onto a central feeder.
- Consolidate: connect several small loads to one larger, better-maintained set and retire the rest.
On a campus, gas pipeline availability often varies building by building, so you may end up with a mix of both routes.
Step 3: Score and Prioritise the Fleet
With fourteen or twenty sets on the register, you need a fair way to decide what goes first. Committees argue less when the ranking comes from a transparent scoring sheet.
Below is a weighted scoring matrix we suggest as a starting point. Score each set from 1 (low) to 5 (high) on each criterion, multiply by the weight, and add up.
| Criterion | Weight | Score 1 looks like | Score 5 looks like |
|---|---|---|---|
| Compliance exposure | 25% | Retirement planned, or tiny set | Large set, clearly in a mandated band, no plan yet |
| Annual run hours | 20% | Under 50 hours a year | Daily running during outages |
| Load criticality | 20% | Sports floodlights, guest house | Hospital, -80°C freezers, animal house, data centre |
| Proximity to people | 15% | Remote pump house | Exhaust near hostel windows or classrooms |
| Engine condition | 10% | Smoky, overdue overhaul (fix first) | Well maintained, low smoke |
| Ease of retrofit | 10% | Cramped plant room, complex route | Open space, straight exhaust run |
A few points on using it well:
- Condition scores invert the logic. A poor engine gets a low score because it should be repaired, replaced or retired before anyone spends on a retrofit.
- Proximity matters on a residential campus. A set venting near a hostel courtyard deserves more weight than an equal set behind the water works.
The output is a ranked list. The top third forms your first wave, subject to the calendar constraints we discuss below.
Step 4: Choose a Procurement Model
Universities buy in very different ways, and the procurement model shapes cost, speed and long-term maintenance. Three models are common.
One central tender
The estate office issues a single tender covering all sets marked for RECD, with a common technical specification, survey scope and commissioning standard.
- Pros: volume pricing, one vendor accountable, standard models, one training programme, one AMC.
- Cons: slower to approve, needs finance committee sign-off, and a single delay holds up every set.
Department-wise purchase orders
Each department buys for its own set, often from its own maintenance budget.
- Pros: fast for urgent cases, and the owner department feels responsible.
- Cons: mixed brands and models, no common spares, inconsistent documentation, and the estate office loses sight of fleet status.
Rate contract
A central rate contract is signed for a set of device sizes with an agreed per-unit price, survey charge and AMC rate. Departments then place call-off orders against it when their set is due.
- Pros: central control of specification and price, with departmental flexibility on timing.
- Cons: needs careful drafting so that site-specific items, such as extra exhaust piping or structural supports, are priced fairly.
For most campuses with more than eight or ten sets, a rate contract or central tender works better than scattered POs. Whatever you choose, insist on the basics: CPCB type approval for the device and model offered, a proper site survey, backpressure calculations within the engine maker’s limit, and clear commissioning records. Our checklist for choosing CPCB approved RECD vendors is a useful annexure for the tender document.
Standardise where you can
Standardisation is the quiet benefit of the fleet approach. If eight sets fall into three or four device sizes, you can hold common consumables and train one in-house team. Aceget’s range runs from 25 kVA to 2500 kVA, and budget numbers by size are discussed in RECD cost in India.
One dashboard, not fourteen logbooks
Modern RECDs, including Aceget’s units, offer IoT monitoring with a local touch display and remote visibility. Specify in the tender that every device must report to a single campus dashboard. The estate office should be able to see backpressure, temperature and alarm status for every set from one screen, rather than sending a technician around campus with a clipboard.
Step 5: Governance: Who Decides and Who Pays
Technical planning is the easy part. The harder part is deciding who owns the decision and whose budget pays.
| Role | Typical responsibility |
|---|---|
| Estate office or works department | Owns the register, scoring, specification, vendor management and site supervision |
| Registrar | Administrative approval, contracts, interface with regulators and statutory bodies |
| Finance committee | Approves capital outlay, chooses the funding model, sanctions the tender |
| Department heads | Confirm load criticality, agree shutdown windows, accept handover |
| Hostel wardens and hospital administration | Communicate shutdowns to residents and patients, arrange temporary backup |
| Safety officer | Hot work permits, fire watch, contractor induction |
Central funding vs departmental chargeback
There are two broad ways to pay.
Central funding treats compliance as a campus-wide obligation paid from the infrastructure capital budget. It is simpler and avoids long internal negotiations.
Departmental chargeback asks each department to pay for its own set, sometimes through a recharge spread over two or three years. It makes departments question whether they need their own 250 kVA set, which can push consolidation. The downside is delay where budgets are thin.
A hybrid often works best: the centre funds the survey, specification and the shared dashboard, while departments pay for their own device and installation through a recharge. Research centres funded by external grants should check whether their grant terms allow such spending before agreeing.
Step 6: Phase the Work Across the Academic Year
The academic calendar decides when a generator can go offline. Fitment usually needs a day or two of downtime per set, varying with exhaust layout, and that day must not clash with exams or a grant deadline.
Map the academic year against your fleet before you fix dates:
- Semester breaks (summer and winter): hostels are partly empty and academic blocks are quiet. Best window for hostel and classroom sets.
- Exam weeks: freeze all work on sets feeding exam halls, the data centre (online exams and results) and hostels.
- Convocation and major events: keep the central plant and auditorium supply untouched for at least two weeks before.
- Research deadlines: ask labs about grant reports, instrument bookings and sample campaigns. A lab with -80°C freezers needs a temporary backup arrangement or a rental set in place before its DG goes offline.
- Hostel occupancy: summer internships and remedial terms can keep hostels fuller than expected. Ask the warden, not the calendar.
- Season: NCR winter brings GRAP restrictions on DG use for non-essential loads, and peak load shedding often arrives in summer. When DG use was allowed for emergency services from 1 October 2023, as reported by India Gazette, health facilities, lifts and water pumping were among the categories. Do not assume your whole campus qualifies; check the current stage order and our guide on GRAP rules for DG sets in Delhi NCR, and mark each set as essential or non-essential in the register.
An illustrative 3-wave plan for a 14-set campus
The example below is illustrative only. It shows a hypothetical NCR campus with 14 sets ranging from 30 to 1010 kVA. Your bands, ranks and routes will differ.
| Tag | Location | kVA (approx kW) | CAQM band | Route | Wave |
|---|---|---|---|---|---|
| DG-CEN-01 | Central plant | 1010 (808) | Above 800 | RECD | 1 |
| DG-HOS-01 | Campus hospital | 500 (400) | 125 to 800 | RECD | 1 |
| DG-DC-01 | Data centre | 320 (256) | 125 to 800 | RECD | 1 |
| DG-RES-01 | Research block (-80°C freezers) | 250 (200) | 125 to 800 | RECD | 1 |
| DG-HST-01 | Boys hostel cluster | 320 (256) | 125 to 800 | RECD | 2 |
| DG-HST-02 | Girls hostel cluster | 250 (200) | 125 to 800 | RECD | 2 |
| DG-ANM-01 | Animal house | 160 (128) | 125 to 800 | RECD | 2 |
| DG-CEN-02 | Central plant | 625 (500) | 125 to 800 | RECD | 2 |
| DG-ACD-01 | Academic block East | 250 (200) | 125 to 800 | Dual fuel or RECD | 3 |
| DG-LIB-01 | Library | 160 (128) | 125 to 800 | Consolidate onto central feeder | 3 |
| DG-WTR-01 | Water works and STP | 125 (100) | 19 to 125 | Dual fuel | 3 |
| DG-SPT-01 | Sports complex | 82.5 (66) | 19 to 125 | Dual fuel or retire | 3 |
| DG-GH-01 | Guest house | 62.5 (50) | 19 to 125 | Dual fuel | 3 |
| DG-STQ-01 | Staff quarters pump house | 30 (24) | 19 to 125 | Review: retire or dual fuel | 3 |
How the waves are timed in this illustration:
- Wave 1 (winter break): the four highest scoring sets, all serving critical loads. Each gets a rental set or a cross-feed arrangement during fitment. The central plant goes first because it is the largest single source and sits in the above-800 kW band.
- Wave 2 (summer break): hostels while occupancy is low, plus the animal house with a temporary set arranged in advance, and the second central plant set.
- Wave 3 (following monsoon term and winter break): smaller sets, with route decisions on dual fuel, consolidation or retirement made after gas availability and load studies are complete.
Spacing waves also helps cash flow, since each wave can sit in a different financial quarter.
Safety during campus works
Exhaust cutting and welding near students and solvent stores needs a hot work permit, a fire watch, extinguishers and a barricade.
The Under-Loaded Set Problem
Department-owned sets are frequently oversized. A 250 kVA set bought for a lab that was “going to expand” may run at 15 to 20% load for life, which wastes fuel and affects emission control.
Most RECDs use a diesel particulate filter that cleans itself through passive regeneration, which needs adequate exhaust temperature. That generally means meaningful load, often cited as around 40 to 50% or more depending on design. A set that runs light for long periods tends to load its filter with soot faster and can suffer wet stacking in the engine itself.
What to do about it:
- Measure first. If the register lacks load readings, a one-week logger study is inexpensive and settles arguments.
- Right-size at the next replacement. If a set must be replaced anyway, size it to the real load.
- Combine loads. Moving two light loads onto one set raises the load factor on that set and removes one stack.
- Plan test runs with load. Monthly test runs on no load do little for either the engine or the filter. Run tests on real or bank load where possible.
Our posts on generator load factor and duty cycle and on whether an RECD suits a DG set that runs only occasionally go deeper into the engineering.
The Consolidation Opportunity
The fleet view often reveals that two or three sets sit within a short cable run of each other, each lightly loaded and each needing its own compliance solution. That is a prompt to ask whether the campus needs all of them.
Consolidation can take two forms. The electrical form connects several buildings to one larger set through a common panel, then retires the smaller sets. The mechanical form, where two sets share one exhaust after-treatment device, is sometimes proposed to save money, but it needs careful engineering around backpressure, isolation and certification. Read whether two diesel generators can share one RECD before considering it, and treat it with caution.
Electrical consolidation is usually the cleaner path: fewer, well-loaded sets with certified devices are easier to maintain, monitor and explain to an inspector.
After Installation: Running the Fleet
Fitting the devices is not the finish line. A fleet needs a routine.
Central monitoring
Assign one estate engineer to review dashboard alarms each morning, especially backpressure warnings, an early sign of soot loading. A red alarm on the hospital or data centre set should reach the duty engineer by phone.
AMC and spares
Bundle DG and RECD maintenance into a fleet AMC, with response times graded by criticality: the freezer set gets a faster clause than the guest house set. The RECD maintenance guide covers routine checks.
Records for SPCB inspection
Keep a folder per asset tag, physical or digital, with:
- Device type approval and test certificate copies.
- Commissioning report, including backpressure readings.
- Consent and NOC documents for the set.
- Maintenance and service logs.
- Hour meter readings and any GRAP period usage log.
When an inspector visits, the estate office should be able to open any set’s folder within minutes. Our article on what happens during a pollution control board inspection explains what officials typically look for. Enforcement is real: there have been reported cases of CAQM ordering the sealing of DG sets at non-compliant units in the region.
Review the register every year
Update the register and rerun the scoring sheet at the start of each academic year, so the budget reflects the current fleet.
Frequently Asked Questions
Do all generators on a university campus need an RECD?
Not necessarily. Under CAQM Direction 76, the route depends on the set’s kW rating. Small sets in the 19 to 125 kW band are directed towards dual fuel, the middle band can choose dual fuel or an RECD, and sets above 800 kW need an RECD. Some sets may be better retired or consolidated. Confirm the current direction and your SPCB’s position.
How do we find out how many DG sets the campus actually has?
Build a DG asset register through a physical walk-round, cross-checked with purchase records, consents and department lists. Sets bought on project grants are often missing from central records.
Should we buy all RECDs in one tender?
For many sets, a central tender or rate contract usually gives better pricing, standard models and one maintenance arrangement. Department-wise purchases are faster but scatter brands and records.
Our lab generator hardly runs. Is an RECD still suitable?
It can be, but light, infrequent running affects passive DPF regeneration. Measure the real load first. If the set is heavily oversized, consider consolidation or right-sizing alongside the emission route decision.
How long will each set be offline during installation?
Fitment commonly needs a day or two of downtime per set, depending on the exhaust layout and site conditions. Survey, design and fabrication happen beforehand without stopping the set. Plan critical loads with a rental set or cross-feed.
Who should pay: the estate office or individual departments?
Either model works. Central funding is quicker and simpler, while departmental chargeback encourages consolidation. A hybrid, where the centre funds survey and monitoring and departments pay for their own devices, suits many universities.
Plan Your Campus Fleet with Aceget
A campus that treats its generators as one fleet can meet emission requirements with fewer shutdowns, lower total cost and much cleaner records. Start with the register, score the sets fairly, and let the academic calendar set the pace. If you would like help with a fleet survey, route decisions or a tender specification, contact the Aceget team with your list of sets and nameplate photos, or explore our range of retrofit emission control devices from 25 kVA to 2500 kVA.