Which Environmental Regulations Apply to Emergency Generators?
Emergency generators trigger air permits, SPCC plans, EPCRA reporting, tank regulations, and more. Here's what facility managers need to know.
Emergency power generators are critical equipment for any facility, especially during storm seasons and natural disasters. But if you have one — or are thinking about getting one — you need to understand the environmental regulations that having a generator on-site can trigger.
⚡ TL;DR: Emergency generators trigger air permits (NSPS, NESHAP, state permits), SPCC plans (if fuel storage exceeds 1,320 gallons), tank registration/certification, EPCRA reporting (if chemical thresholds triggered), PCB compliance, and OSHA occupational exposure assessments. Potential-to-emit must be included in air permits regardless of actual usage frequency.
The EPA defines emergency generators as stationary combustion devices (such as reciprocating internal combustion engines or turbines) that serve solely as a secondary source of mechanical or electrical power during power outages or natural disasters beyond the operator’s control.
There are no time limits on using emergency generators during an actual emergency, but there are limits on the number of hours a generator can be used in non-emergency situations.
⚠️ What’s at stake: Adding an emergency generator without proper environmental compliance can trigger multiple violations—air permit violations ($5,000–$25,000), SPCC violations ($5,000–$37,500 per day), EPCRA reporting failures ($10,000–$37,500), and tank certification gaps ($3,000–$10,000). Combined fines for a non-compliant generator installation often exceed $50,000–$150,000.
Air Quality Regulations
This is typically the first regulatory area affected. Depending on the size of your generator and where your facility’s air emissions currently stand relative to your permit thresholds, adding a generator could trigger:
- New Source Performance Standards (NSPS) — applies to certain engine types and sizes
- National Emission Standards for Hazardous Air Pollutants (NESHAP) — if the generator combusts fuels that produce HAPs
- State and local air permits — your state may require a permit modification or new permit for the additional emission source
- Emission inventory updates — the generator’s potential emissions must be accounted for in your facility’s annual air emissions inventory
Even if your generator is used only during emergencies, the potential to emit must be calculated and included in your facility’s air permit documentation.
Fuel Storage Regulations
SPCC Plans
If your generator has an associated fuel storage tank (which most do), your facility may be triggered into SPCC (Spill Prevention, Control, and Countermeasure) plan requirements. SPCC applies to facilities storing more than 1,320 gallons of oil aboveground or 42,000 gallons underground. Even a single diesel generator fuel tank, combined with other oil storage on-site, can push you over the threshold.
Tank Certifications and Registrations
Aboveground and underground fuel storage tanks may need to be registered, permitted, inspected, and certified per state and local regulations.
EPCRA and Chemical Reporting
If your generator’s fuel storage brings your on-site chemical quantities above EPCRA reporting thresholds, you may need to file Tier II reports and comply with emergency planning, chemical inventorying, and notification requirements.
PCBs
Older generators or associated electrical equipment (transformers, capacitors) may contain polychlorinated biphenyls (PCBs). Any cleanups, exposures, or removals involving PCB-containing equipment must be handled according to EPA’s PCB regulations.
Employee Exposure Considerations
While technically a safety issue, backup generators brought into a facility can create occupational exposure concerns:
- Noise monitoring should be conducted to determine potential exposure levels for workers in the area
- Exhaust emissions from indoor generators may require engineering controls or air monitoring to protect employees from chemical exposure
- Carbon monoxide is a particular concern for generators operated in enclosed or semi-enclosed spaces
Is your facility adding an emergency generator? Does your existing generator have proper air permits, SPCC compliance, and tank certification? iSi Environmental can conduct a complete environmental compliance review for emergency generator installations. Schedule a generator compliance assessment →
💰 The cost of non-compliance: EPA and state agencies assess penalties for air permit violations ($5,000–$25,000), SPCC violations ($5,000–$37,500 per day), and tank certification failures ($3,000–$10,000). A single audit finding multiple violations can result in combined penalties of $50,000–$150,000+. Corrective action and compliance remediation often exceed $75,000–$500,000.
What Should You Do?
If you are adding an emergency generator to your facility — or already have one that hasn’t been evaluated for regulatory compliance — a review of these requirements is essential. The cost of compliance upfront is far less than the cost of violations discovered during an inspection.
iSi’s environmental compliance team can help you evaluate which regulations apply to your generator setup and ensure you are in full compliance. Contact us for more information and pricing.
Frequently Asked Questions
Q: Do EPA air quality regulations apply to emergency generators used only for power outages?
Yes. Even if an emergency generator is used exclusively during actual power outages or natural disasters, EPA air quality regulations apply based on the generator’s potential to emit. Potential emission calculations must be included in your facility’s air permit and annual emissions inventory regardless of actual usage. Depending on generator size and your facility’s current emissions, New Source Performance Standards (NSPS) and National Emission Standards for Hazardous Air Pollutants (NESHAP) may apply. State and local agencies may require air permit modifications. iSi Environmental helps facilities in Kansas and Oklahoma evaluate emergency generator air compliance obligations.
Q: Does adding an emergency generator fuel tank trigger SPCC requirements?
Yes, if the generator fuel storage tank, combined with other oil or fuel storage on-site, exceeds 1,320 gallons aboveground or 42,000 gallons underground, SPCC (Spill Prevention, Control, and Countermeasure) requirements are triggered. A single emergency generator diesel tank can push a facility over the SPCC threshold when combined with lubricating oils, hydraulic fluids, and other petroleum products. Facilities with SPCC requirements must maintain spill prevention plans, secondary containment systems, and employee training. iSi Environmental ensures emergency generator fuel systems comply with SPCC regulations.
Q: Does an emergency generator fuel storage tank require registration and inspection?
Yes, both aboveground and underground fuel storage tanks typically require state and local registration, permitting, periodic inspections, and certification. Tank certification requirements verify structural integrity and prevent leaks. Registration ensures regulatory visibility and compliance tracking. Tanks must meet specific construction standards and be maintained in proper condition. Failure to register or maintain tanks can result in EPA and state environmental violations. iSi Environmental helps facilities register emergency generator fuel tanks and maintain compliance with storage tank regulations.
Q: What employee occupational exposure concerns exist with emergency generators?
Emergency generators present noise exposure concerns requiring hearing conservation assessments and potential noise monitoring to determine if workers exceed occupational exposure limits. Exhaust emissions from generators—particularly carbon monoxide—present inhalation exposure hazards, especially if generators are operated in enclosed or semi-enclosed spaces. OSHA requires exposure monitoring and engineering controls if occupational exposure thresholds are approached. Older generators may contain PCBs in transformers or capacitors requiring special handling. iSi Environmental conducts occupational exposure assessments for emergency generator installations.
Every satisfactory emergency generator compliance program starts with proper air permits, SPCC planning, and tank certification. iSi Environmental helps manufacturing and industrial facilities in Kansas and Oklahoma evaluate which regulations apply to their generators and ensure full compliance. Schedule a generator compliance review →
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