Emergency Generator Emissions Calculator - Diesel CO2, Local Pollutants & RICE/NSPS Review Flags
Calculate emergency and non-emergency generator emissions with EPA tier standards and RICE NESHAP hour limits
Screen stationary diesel generator runtime and fuel use with EIA-sourced CO2, local NOx, CO, PM, and SOx placeholder rows, and RICE NESHAP / NSPS Subpart IIII source-pointer warnings. Enter kW rating, a diesel fuel-rate estimate or manual gal/hr value, annual emergency hours, maintenance/testing hours, demand-response hours, and a local tier multiplier. The output is a planning worksheet only, not a RICE NESHAP compliance determination, AP-42 factor reproduction, permit application, PTE calculation, or certified engine emission value.
Calculate diesel SOx emissions by sulfur content since fuel grade drives your generator SOx totals
Diesel Sulfur Emissions Calculator →Review Title V fee assumptions only after an approved emissions method is selected
Title V Fee Calculator →Move reviewed generator totals into the facility inventory screen after method checks
Facility Emissions Inventory →Size the standby generator for your facility electrical load before calculating its emission impact
Generator Sizing Calculator →How It Works
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Enter Diesel Generator Inputs
Input generator kW, choose the local tier multiplier row, and either use the local full-load fuel-rate estimate or enter a measured/manufacturer gal/hr value.
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Separate Runtime Categories
Enter annual emergency, maintenance/testing, and demand-response hours separately so the worksheet can show 100-hour and 50-hour review flags.
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Review Fuel and CO2 Output
Check annual diesel gallons and CO2 based on the EIA diesel/distillate source pointer. Regulated reporting may require EPA GHG Hub, 40 CFR Part 98, permit, or program-specific methods.
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Treat Local Pollutants as Placeholders
NOx, CO, PM, SOx, and tier comparison rows are local placeholders. Replace them with AP-42 row review, permit factors, engine certification data, source-test data, or CEMS records before regulated use.
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Verify Rule Applicability
Use the RICE NESHAP and Subpart IIII links as source pointers only. Engine age, type, site status, permits, state rules, and operating categories control actual obligations.
Built For
- Facility teams preparing a source-review packet before an environmental professional checks generator records
- Environmental staff estimating diesel CO2 and placeholder pollutants before selecting an approved inventory method
- Building engineers collecting runtime categories for permit and state-agency review
- Data center or hospital teams screening multiple standby generator hour logs before formal compliance review
- Industrial plants evaluating whether demand-response participation needs rule and permit review
- Consultants documenting source gaps before replacing placeholder rows with approved factors
Assumptions
- Fuel is diesel/distillate fuel; the app does not model natural gas, propane, gasoline, dual-fuel, landfill-gas, or fire-pump-specific rows.
- CO2 uses the EIA diesel/distillate source pointer value of 22.45 lb/gal.
- Auto fuel rate uses a local full-load planning estimate of 7 gal/hr per 100 kW.
- NOx, CO, PM, SOx, and tier multipliers are local placeholders and are not AP-42 row-verified or certified engine values.
- The 100-hour and 50-hour outputs are review screens, not compliance determinations.
Limitations
- Does not determine emergency/non-emergency classification, RICE NESHAP compliance, NSPS applicability, notifications, reports, or record retention.
- Does not calculate PTE, Title V, PSD, NSR, NNSR, synthetic-minor, HAP, GHGRP, or state inventory applicability.
- Does not include VOC, HAPs, CH4, N2O, CO2e, PM10, PM2.5, controls, startup/shutdown, or malfunction emissions.
- Does not verify engine certification, manufacture date, reconstruction, fuel sulfur records, permit terms, source-test data, CEMS data, or state/local rules.
- Does not replace a qualified environmental professional or regulatory agency review.
References
- EIA Carbon Dioxide Emissions Coefficients - diesel/distillate CO2 source pointer.
- EPA AP-42 Chapter 3.4 - large stationary diesel engine source pointer.
- EPA AP-42 Chapter 3.3 - industrial diesel engine source pointer.
- 40 CFR Part 63, Subpart ZZZZ - stationary RICE NESHAP source pointer.
- 40 CFR Part 60, Subpart IIII - stationary compression-ignition ICE NSPS source pointer.
Frequently Asked Questions
Learn More
Where Your Facility's Emissions Actually Come From
Most facilities undercount their emission sources. Combustion, refrigerants, coatings, and backup generators all add up - and the permit math starts with knowing what you're actually releasing.
When Your Backup Generator Needs a Permit
RICE NESHAP, emergency vs non-emergency hours, and the 100-hour maintenance limit that catches most facilities off guard. What triggers permitting for standby generators.
Estimating Facility Emissions
AP-42, material balance, CEMS, and stack-test method prompts before source-supported facility emissions review.
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