ACF Standby Systems Blog

Generac Expands Industrial Product Portfolio


Gaseous-fueled generators are becoming more attractive for standby applications above 150 kWE. The capital cost and thermal efficiency advantages of diesel over gaseous fuels have been moderated by the maintenance and reliability challenges of storing diesel fuel over long periods of time. Additionally, a number of recent technological innovations in implementing high-kWE  gaseous-fueled solutions are allowing such generators to compete with their diesel-fueled counterparts on cost and power.

Additionally, the fact that spark-ignited engines offer improved emission profiles over compression-ignited engines—and that gaseous fuels do not pose the kinds of environmental risks inherent in diesel fuel storage—is making gaseous-fueled generators more attractive to the ever-growing number of companies looking to reduce their overall carbon footprint.

Diesel-fueled generators will most assuredly continue to serve the standby power market; no single solution is ideal for every Only slightly more expensive than diesel-only designs, bi-fuel generators offer several important advantages. For one, the lower capital cost of a compression-ignited engine is retained while capitalizing on many of the advantages of gaseous fuel, such as application. Gaseous-fueled generators, however, are coming more cost-effective and environmentally-friendly options for applications above 150 kWE.


To evaluate the bigger environmental picture, it is important to compare the source-to-site cost of the fuel used in diesel and gaseous-fueled generators. This is the total cost associated with using the fuel. It includes such items as extraction and transportation costs, the current market price of the fuel, and the cost per kilowatt hour. Consideration of total CO2 emissions is critical, as well, in determining environmental impact. It is possible to quantify all of these items and bring them into the cost-benefit analysis regarding generator fuel choice.

The following chart shows efficiency and CO2 comparisons of gaseous-fueled and diesel generating sets.

Diesel vs. Gaseous-fueled Generators: Total Cost and Total CO2 Emissions

Diesel vs. Gaseous Fuel

Combining fuel cost with environmental impact provides companies with a broader view to the true bottom line, and overall environmental impact, of their generator choice. For example, while a 100 kWE diesel engine burns fuel 23% more efficiently than a similar-sized gaseous- fueled engine (column J), its fuel cost per kilowatt hour is almost double (column I) and its total CO2 emissions are more than 16% greater (column O). Additionally, gaseous-fueled generators have historically cost less per installed kilowatt than their diesel counterparts in the smaller sizes (column K).


Generac Industrial Power offers diesel and gaseous-fueled generators for every standby power solution.

  • Diesel up to 25 MWE
  • Gaseous up to 300 kWE
  • Bi-Fuel™ 600 kWE
  • Parallel power solutions up to 9 MWE using Generac’s Modular Power Systems (MPS

Modular Power Systems (MPS)

Generac’s Modular Power System (MPS) is a combination of the industry’s most reliable generators and state- of-the-art integrated paralleling technology. Powered by either diesel or gaseous fuel, MPS is appropriate for numerous types of businesses, including hospitals, airports, office buildings, manufacturing plants, data centers, and retail superstores. Not only does MPS boast a reliability rate of up to 99.9999%, it is more cost effective and flexible than single generator sets with the same load capacity, making expensive stand-alone switchgear obsolete.


Generac’s Gemini Twin Pack houses two generators within a single enclosure, providing the same amount of power in a footprint that is 20% smaller than many single engine units. Gemini provides built-in redundancy for superior system reliability and scalability along with load shedding capabilities. Parallel up to seven diesel or gaseous-fueled Gemini systems without additional switchgear.


Perhaps the solution that most effectively combines the power of diesel with the environmental friendliness of natural gas, Generac’s Bi-Fuel system generators start on diesel fuel and add natural gas as load is applied. During an outage, each Bi-Fuel unit can optimize at a fuel mixture of 75% natural gas and 25% diesel. If the natural gas supply is interrupted, the generator automatically switches to 100% diesel without any power drop during the transition. At varying loads, the advanced fuel system maximizes the use of natural gas while closely monitoring the system for safe operation.

Your best resource is your ACF Standby Systems. In many cases, we have already designed/installed a similar application so they can offer advice based on that experience. In addition, we have a wealth of local knowledge that can help you make the best location decision.

ACF, Inc. is ‘The logical choice.’

So whether your business is in Tampa, Orlando, or anywhere else in Florida we can provide the quality repair service your business can depend on. Find out why thousands of our customers have depended on us!

We offer expanded service capabilities throughout the state of Florida with offices in TampaOrlandoJacksonville and MelbourneParts stocked locally throughout Florida. Our service team is available 24-hour / 7 days a week. We offer repair, preventative maintenance programs and installation of air compressors systems and generators for commercial and industrial clients.

Let us share our expertise with you today! 813-621-9671.

The information above was excerpted from: GASEOUS-FUELED GENSETS an Alternative to Diesel Solutions (White Paper)

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