Dual Fuel Generators (Diesel + Gas): Cut Your Fuel Costs by Up to 40%

What Is a Dual Fuel Generator?

A dual fuel generator runs on a combination of diesel and natural gas (PNG/CNG) simultaneously. The engine starts on 100% diesel, and once it stabilizes, natural gas is gradually introduced - replacing 50-70% of the diesel consumption. The diesel acts as a pilot fuel for ignition (since natural gas needs a higher ignition temperature), while the gas provides the bulk of the energy.

The result? Fuel cost savings of 30-40% - without any loss of power output, reliability, or engine life. Alpha Diesels supplies and retrofits dual fuel systems for generators from 62.5 kVA to 1000+ kVA.

How Dual Fuel Technology Saves Money

The economics are straightforward. As of 2026, diesel costs approximately ₹90-95 per liter in Rajasthan, while PNG (piped natural gas) costs ₹35-45 per SCM (standard cubic meter). Since 1 SCM of PNG has roughly the same energy content as 1.1 liters of diesel, switching 60% of your fuel from diesel to gas saves approximately:

• 125 kVA genset running 8 hours/day: Saves ₹1,500-2,000 per day → ₹45,000-60,000 per month
• 250 kVA genset running 12 hours/day: Saves ₹4,000-5,500 per day → ₹1.2-1.65 lakh per month
• 500 kVA genset running 16 hours/day: Saves ₹8,000-11,000 per day → ₹2.4-3.3 lakh per month

For a factory running a 250 kVA genset regularly, the dual fuel conversion pays for itself in 4-6 months.

Environmental Benefits

Beyond cost savings, dual fuel operation significantly reduces emissions:

• Particulate Matter (PM): Reduced by 50-60% (gas burns much cleaner than diesel)
• NOx emissions: Reduced by 15-25%
• CO2 emissions: Reduced by 20-30%
• Smoke opacity: Near-zero visible smoke during gas mode operation

This makes dual fuel an excellent option for businesses in pollution-restricted zones (Delhi-NCR) or those seeking CPCB compliance for older gensets without full replacement.

Who Should Consider Dual Fuel?

• Factories with PNG connection: If your industrial area has piped natural gas (available in most RIICO zones, IMT Manesar, HSIIDC Bawal), dual fuel is a no-brainer
• Gensets running 4+ hours daily: The higher your runtime, the faster the investment pays back
• Businesses facing CPCB pressure: Dual fuel reduces emissions enough to pass CPCB inspections for many older gensets
• Cost-conscious operations: Any business where fuel is a significant operational expense

Can My Existing Generator Be Converted to Dual Fuel?

Yes - most diesel generators from 62.5 kVA and above can be retrofitted with a dual fuel kit. The conversion involves:

• Gas mixer assembly: Installed on the air intake to blend natural gas with the incoming air
• Electronic control unit (ECU): Monitors engine parameters and adjusts the gas-to-diesel ratio in real-time for optimal combustion
• Gas train: Includes pressure regulator, solenoid valve, and safety shut-off valve
• Safety systems: Gas leak detectors, flame arrestors, and emergency shutdown systems

The conversion takes 1-2 days and does not modify the base engine. If the gas supply is interrupted, the generator automatically reverts to 100% diesel operation with zero downtime - so you never lose power.

Dual Fuel vs Full Gas Generators

Alpha Diesels also supplies full PNG gas generators that run entirely on natural gas. The choice between dual fuel and full gas depends on your situation:

Factor	Dual Fuel	Full Gas
Fuel flexibility	Runs on diesel if gas unavailable	Requires gas supply at all times
Fuel savings	30-40%	40-50%
Retrofit possible	Yes (existing diesel genset)	No (new purchase required)
Best for	Existing genset owners	New installations with reliable gas supply
Capital cost	₹1.5-3 lakh (retrofit kit)	₹8-15 lakh (new generator)

Get a Dual Fuel Assessment

Not every genset or site is suitable for dual fuel conversion. Factors like gas pressure, engine condition, load profile, and ventilation all matter. Alpha Diesels offers free site assessments across Bhiwadi, Neemrana, Bawal, Gurugram, and Delhi-NCR. Our engineers will evaluate your genset, calculate your specific savings, and provide a detailed proposal. Call +91-97993-03700 to schedule your assessment.