Generator Emission Upgrades


The rules governing industrial-power generator emissions are constantly evolving. The current set of EPA compliance standards, Tier 4, strictly limits the allowable amount of the following emissions:

  • Carbon monoxide
  • Hydrocarbon
  • Diesel particulate matter
  • Nitrogen oxide (NOx)

Failure to meet these tight standards can result in fines or a full shutdown of your offending generators, which can be a major issue for many businesses, industries and installations. Here at Woodstock Power, we can help solve the problems with your diesel generator emissions by upgrading your emissions systems. Not only will you be compliant with regulatory standards, but you will also be running a cleaner installation that reduces the impact of your generator on the environment, which benefits everyone.

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The EPA Tier 4 standards and regulations not only apply to new diesel generators, but are also retroactive for older diesel commercial generators. Suppose you have a diesel commercial generator for your business operations, industrial applications, or facility that is in good, running condition, but fails to meet the EPA Tier 4 Final standards and regulations – what do you do? There are a couple of options.

While there is the option to replace the diesel generator entirely with a brand new diesel commercial generator, this is often a time consuming and costly process. If your commercial generator is worse for wear, intermittently failing, or simply in need of replacing, this may be the best option.

What if your generator has low hours, has been serviced, maintained, and in great condition to keep going? A simpler, more cost-effective option is available that can help companies pass EPA emissions standards is an emissions upgrade.

What’s the Upgrade?

The upgrade is an aftermarket installed attachment called a diesel oxidation catalyst (DOC for short).

More information on our catalyst systems can be found here: Stationary Engine Catalytic Converters

What Is a Diesel Oxidation Catalyst (DOC)?

Diesel oxidation catalysts (DOCs) help to reduce carbon by up to 99% and require little maintenance apart from the regular service and maintenance performed on the generator itself.

This high performance catalyst upgrade can reduce Carbon Monoxide (CO) by up to 99%, Hydrocarbons (HC) by up to 90%, Diesel Particulate Matter (DPM) by up to 95%, and Nitrogen Oxides (NOx) by up to 99%.

Simply put, a diesel oxidation catalyst (DOC) is designed to oxidize carbon monoxide (CO), gas phase hydrocarbons, and diesel particulate matter. What it essentially does is it converts carbon monoxide (CO) and hydrocarbons into carbon dioxide (CO2) and water vapor, resulting in lowered harmful emissions into the atmosphere.

Our Solutions

Woodstock Power Company provides full turnkey solutions for emissions upgrades by offering and installing diesel oxidation catalysts (DOCs) for commercial diesel generators that can benefit from the upgrade.

It should be noted that not all commercial generators will become automatically compliant with Tier 4 Final standards and regulations after upgrading. Depending on the generator, some will only meet EPA Tier 2 standards.

If the generator was manufactured before April 1st, 2006 and larger than 225 kW, you may be able to meet EPA Tier 4 Final standards by adding our upgrade.

The upgrade process is fairly simple and straight forward, which we outline in detail below:

  1. Inspect & Assess Generator for Compliance
    • After our inspection and assessment to determine if the generator is upgradable, we will then determine which upgrades are necessary and tasks that need to be carried out. This not only includes the diesel oxidation catalyst (DOC), but could also include a monitoring system, crankcase, and will also need to perform stack testing & reporting.
  2. Installation
    • Upon review and approval, we would move forward with installation of the diesel exhaust catalyst (DOC) and any additional components required to successfully complete the upgrade.
  3. Completion
    • Once we finish the installation of upgrade components, we perform an exit test to ensure that the generator is running properly to meet EPA Tier 4 compliance.

Contact Us FOR any questions

Woodstock Power Company has trained industry experts and professionals that specialize in generator emissions upgrades. If you have questions about your commercial diesel generator meeting EPA Tier 4 Final standards and regulations, looking to upgrade your commercial generator, or ways to lower your generator’s overall carbon footprint, please reach out to us at Woodstock Power Company.


Alternatively, you can fill out our Contact Form and our specialists will get back to you!

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