Cleanest fuel choice for NCR: Gas-fired generators receive favorable treatment under CAQM Direction 76 (operations allowed during GRAP stages). ~30% lower CO2, ~50% lower NOx, near-zero particulate matter vs diesel. Read NCR compliance guide →
Gas Generators (PNG / CNG / LPG)
Spark-ignition gas-fueled gensets from 10 kVA to 1000 kVA. Run on Pipeline Natural Gas, Compressed Natural Gas, or LPG. No fuel storage, low maintenance, quietest in-class operation.
Indicative new pricing Rs 3 lakh - 1.1 crore by capacity. Running cost typically 30-55% lower than diesel-only.
Indicative Gas Genset Pricing by Capacity
Indicative new gas genset prices (PNG-fueled, spark-ignition, with standard canopy). Add 8-15% for super-silent acoustic canopy or premium controls.
| Capacity | Indicative New Price |
|---|---|
| 10 - 50 kVA | Rs 3 - 8 lakh |
| 62.5 - 125 kVA | Rs 7 - 18 lakh |
| 160 - 250 kVA | Rs 15 - 30 lakh |
| 320 - 500 kVA | Rs 28 - 55 lakh |
| 625 - 1000 kVA | Rs 50 lakh - 1.1 cr |
Pricing reflects new gas genset market quotes in 2024-26. Gas gensets are typically 10-15% pricier than diesel-only equivalents but 20-30% cheaper than factory dual-fuel units of the same capacity. Final quote depends on brand (Cummins / GE Jenbacher / Caterpillar / Indian OEMs), canopy spec, control system tier, and accessories.
Gas-Only vs Dual-Fuel vs Diesel-Only - Choose Your Fuel Strategy
Each fuel choice fits a different use case. Pick wrong and you over-pay capex OR over-pay opex.
| Fuel Choice | Upfront Cost | Running Cost |
|---|---|---|
| Diesel-only CPCB IV+ | Lowest (your reference baseline) | Highest (Rs 21-25/kWh) |
| Dual-fuel (Diesel + PNG/CNG) | 20-30% higher than diesel-only | Medium (Rs 12-18/kWh blended) |
| Gas-only (PNG/CNG) | 10-15% higher than diesel-only | Lowest (Rs 11-14/kWh) |
Emissions: Gas vs CPCB IV+ Diesel
Cleaner combustion translates directly to lower emissions per unit of electricity generated. Even compared to the latest CPCB IV+ diesel standard, gas wins meaningfully on every pollutant.
| Pollutant | Diesel CPCB IV+ | Gas (PNG) | Reduction |
|---|---|---|---|
| CO2 (carbon dioxide) | 750-850 g/kWh | 490-560 g/kWh | 30-35% lower |
| NOx (nitrogen oxides) | 0.4 g/kWh (CPCB IV+) | 0.15-0.25 g/kWh | 40-60% lower |
| PM (particulate matter) | 0.02 g/kWh (CPCB IV+ with DPF) | Near zero (<0.005 g/kWh) | 95%+ lower |
| Sulphur emissions | Trace (HSD has 10 ppm sulphur cap) | Effectively zero | Eliminated |
Emission values are typical for modern spark-ignition gas engines vs CPCB IV+ diesel with DPF + SCR. Reductions matter both for environmental footprint AND for NCR GRAP compliance where gas-fired operations face fewer restrictions.
Noise Comparison - Why Gas Wins for Hospitality & Healthcare
Gas combustion is naturally quieter than diesel. For noise-sensitive sites, this matters more than the fuel-cost story.
| Genset Type | Typical Noise Level |
|---|---|
| Standard diesel genset (open) | 85-95 dB at 1m |
| Silent canopy diesel | 75-85 dB at 1m |
| Super-silent canopy diesel | 68-75 dB at 1m |
| Gas-fired genset standard | 70-78 dB at 1m |
| Gas-fired with acoustic canopy | 60-68 dB at 1m |
For context: 60-68 dB is roughly the level of normal conversation; 75-85 dB is similar to busy traffic. Hotels, hospitals, and residential complexes typically have local noise limits of 65-75 dB during night hours.
CHP / Cogeneration - The Bonus Efficiency Story
For sites that need both electricity AND heat (hot water, steam, kitchen, laundry), gas gensets can deliver both - lifting total efficiency from 30-40% to 75-85%.
Hotels
Heat Use
Hot water for guest rooms + laundry + kitchen
Efficiency Boost
Combined efficiency: 75-85% (vs 30-40% power-only)
Capex Addition
Heat recovery system Rs 8-25 lakh based on kVA
Payback
2-4 years on hot water savings alone
Hospitals
Heat Use
Laundry, kitchen, sterilization, hot water
Efficiency Boost
75-82% combined efficiency
Capex Addition
Rs 10-30 lakh for heat recovery + distribution
Payback
3-5 years
Process Industries (food, pharma, textile)
Heat Use
Process steam, hot water for cleaning
Efficiency Boost
80-90% (highest when heat-load matches)
Capex Addition
Rs 15-60 lakh based on steam scale
Payback
2-4 years
CHP requires a steady heat load that matches genset operation hours. We size CHP systems via detailed thermal load assessment as part of our paid engineering report. See power backup consultation for the engineering scope.
Where Gas Generators Make the Most Sense
Gas wins on cost, emissions, and noise. It loses on diesel-backup reliability. Match the fuel choice to the use case.
Hotels & Hospitality
Quietest + cleanest. Often combined with CHP for guest hot water.
Hospitals (non-critical wings)
Gas-only for general wards + admin. Diesel/dual-fuel for OT/ICU criticality.
Residential Complexes
Low noise allows operation during night hours. PNG line in most metros.
IT Offices (prime power)
If you run genset 8-12 hrs/day on grid-stress, gas pays back fast vs diesel.
Gas generators only work if gas is available at your site
Before buying, verify PNG/CNG availability at your specific location. Our dual-fuel page has an NCR + Rajasthan zone availability map showing GAIL / IGL / Adani Gas coverage.
Continue Exploring Alpha Diesels
Authorized Greaves Cotton (diesel generators) and Kirloskar Pneumatic (air compressors) dealer. 25+ years serving North India.
Service and Support for This Range
Available Across Industrial North India
Frequently Asked Questions
Common questions about PNG / CNG / LPG gas generators
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