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Generator Emissions Estimator

CO2 and NOx for a year of generator hours, compared with the same energy from the grid.

Inputs

Inputs and assumptions

Diesel generators run about 0.7 to 0.85 kg per kWh at typical efficiency.

Tier 4 Final stationary engines are near 0.4 g per kWh; uncontrolled older engines run far higher.

US average is about 0.39 kg per kWh; regional values vary widely.

Result

Generator CO2 per year
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Generator CO2 in short tons
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Extra CO2 versus the grid
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Grid CO2 for the same energy
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NOx per year
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What to check

  • Engine tier or emissions category from the nameplate
  • Local air permit thresholds in tons per year

Related calculators

Estimator-grade emissions only. Engine emissions category, fuel sulfur, load profile, and regional grid intensity all move these numbers; an air permit analysis uses measured or certified data.

Saved calculations

Keep the assumptions with the result.

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