Gaseous Generator Financing

The diesel tank on a standby generator is both its greatest strength and its biggest vulnerability. Diesel stores energy reliably and the engine is proven, but the fuel can degrade after 12 to 18 months in the tank, delivery trucks may not reach the site during a prolonged grid outage, and Tier 4 emissions compliance in some regions is pushing installations toward cleaner alternatives. Gaseous generators, running on utility natural gas, propane, biogas, or synthetic gas, sidestep the fuel-storage problem by drawing from a supply line that keeps flowing regardless of road conditions or storm-related logistics failures.

We fund gaseous generators from the $50,000 minimum through multi-megawatt gas-engine prime power systems, new and used, covering natural gas, propane (LP), bi-fuel, and biogas configurations. Most buyers, including commercial facilities managers, CHP project developers, and municipal utilities, get funded in one to two weeks. Tell us the fuel source, the kW rating, and the application, and we build the structure around the project.

Gaseous Fuel Options and Engine Families

Natural gas generators draw from the utility distribution network, which means no on-site fuel storage, no fuel delivery scheduling, and no degradation concerns. The trade-off is that utility gas supply can be interrupted in major earthquakes or in the aftermath of infrastructure damage, which is why some critical facilities specify a bi-fuel configuration that can switch between gas and diesel when gas supply is uncertain. For most commercial applications in urban and suburban settings with reliable gas infrastructure, the natural-gas-only configuration is sufficient and operationally simpler.

Propane generators offer the energy density and fuel stability of diesel with the cleaner combustion profile of natural gas. Propane is the standard choice for standby power at rural facilities, agricultural operations, and remote commercial sites where natural gas infrastructure is not available. Storage tanks from 500 to 30,000 gallons hold propane stably for years without the degradation issues diesel faces. Propane standby sets are also the dominant product in the residential and light commercial market, where brands like Generac and Kohler supply the bulk of units sold.

Biogas and landfill-gas generators form a specialized category covered more fully in our biogas generator financing page, but they are worth noting here because they use a gaseous engine platform (typically spark-ignited, Otto-cycle engines similar to natural gas units) with modifications for gas with lower BTU content and higher moisture and hydrogen sulfide concentrations than utility-grade natural gas. The engine platforms from Caterpillar, Cummins, and Jenbacher all have gaseous variants that span all of these fuel types, often with field-adjustable fuel systems that allow switching between fuel sources.

Why Gaseous Generators Are Growing Market Share

California's Air Resources Board, Texas ERCOT storm-event experience, and federal EPA Tier 4 Final regulations have all pushed facilities managers to reconsider diesel as the default standby fuel. Gaseous sets emit significantly lower nitrogen oxide and particulate matter per kWh than diesel, which allows installation in jurisdictions with strict air-quality regulations that would otherwise require costly diesel after-treatment systems on large sets.

The commercial real estate sector has been a significant driver of gaseous generator adoption in major metros. Property owners in dense urban markets like New York and Los Angeles face air-permit restrictions that make large diesel installations difficult to permit, while natural gas units often qualify for less restrictive permit categories with lower annual operating hour limits. A 500 kW to 2,000 kW natural gas standby set in a Class A office or mixed-use tower has become the standard choice in these markets.

Combined heat and power (CHP) applications have also accelerated gaseous engine adoption in manufacturing and industrial facilities, universities, and hospitals that want to extract heat from the engine jacket water and exhaust to reduce building heating costs. The economics of CHP almost always favor a gaseous fuel over diesel because the runtime hours are much higher (often 4,000 to 8,000 hours per year) and fuel cost per kWh is lower. CHP is covered in depth on our combined heat and power generator financing page.

Underwriting Gaseous Generator Purchases

Gaseous generators finance the same way diesel sets do. Under $400,000, we need a application plus recent generator-file bank records. Above that threshold, we move to a light financial package (two years of business returns and a current balance sheet) but still move faster than a bank. Most commercial standby and prime-power gaseous sets fall landing between $75k and $400k per unit, comfortably within application-only territory.

CHP project financing sometimes involves larger transaction sizes, particularly when the project includes heat exchangers, absorption chillers, and electrical interconnect equipment alongside the engine-generator set. For those projects, we can structure a single facility that covers the full installed cost rather than separating the generator from the balance-of-plant equipment. Ask about our approach to full-project gaseous power financing, including both purchase and lease structures that allow the operating entity to match payments to the energy savings the project generates.

For buyers using an equipment refinancing approach, existing diesel sets can sometimes be refinanced at the same time a gaseous replacement is financed, with the proceeds of the diesel sale applied to the new purchase and the net difference financed. This trade-in-style approach reduces the out-of-pocket cost of transitioning the standby fleet from diesel to gas.