A 20 kW natural gas genset from a Chinese OEM lists at FOB USD 5,000 to 5,380 per set, with a 5-set minimum order, on a Shanghai Incoterm, as of June 2026 [S4]. A 30 kW microturbine from Capstone targets industrial CHP and runs through a different cost stack: low moving-part count, factory protection plans of 5 or 9 years, and remote diagnostics [S2].
Two platforms dominate the catalogue: the reciprocating spark-ignited gas engine (Cummins QSJ2.4G, 20 to 60 kW standby, 60 Hz, NFPA 110 Level 1 capable) [S1] and the microturbine (Capstone C30, 28 to 30 kW, 400 to 480 V, air-bearing, no oil or coolant) [S2]. Rolls-Royce Power Systems (mtu) positions gas gensets as a standalone product line alongside diesel and dynamic UPS, covering standby, continuous CHP, and microgrid use cases [S3].
Entry-tier pricing: 20 to 60 kW natural gas reciprocating sets
The cheapest credible published 2026 datum is FOB USD 5,000 to 5,380 for a 20 kW, 1800 rpm, 60 Hz natural gas generator set, payment terms L/C or T/T, 5-set minimum, on Shanghai terms [S4]. For a stationary, three-phase, air-cooled industrial gas genset, the Cummins QSJ2.4G family covers 20 to 60 kW standby (25 to 75 kVA) at 60 Hz, EU IIIA emissions-compliant, with ambient operation up to 50 °C, and an aluminum enclosure rated to 150 MPH wind loading [S1].
Specifying engineers should treat the EVOMAX FOB figure as the bare machine; it excludes enclosure, control gear, switchgear, and commissioning. The QSJ2.4G datasheet, by contrast, includes the PowerCommand 1.1 control, alternator with 2/3-pitch windings, and an integrated cooling package in the published configuration, which is why OEM-channel pricing is not directly comparable to Chinese export FOB [S1].
Mid-tier: microturbine pricing and the TCO math
Capstone C30 microturbine power is rated 28 to 30 kW (38 to 41 hp) at 400 to 480 V, three-phase, stationary, with mechanical fuel injection, and ships as a single moving-part package with no lubricating oil or coolant [S2]. The economic case is maintenance-driven: 5-year and 9-year factory protection plans are offered, and the line is described as having accumulated "tens of millions of run hours" cumulatively across the installed base [S2].
Indicative pricing for microturbines is not published and varies by country, taxes, and raw-material indices [S2]. A reasonable bid envelope for a 30 kW natural gas microturbine in 2026, based on the published specs and the OEM service structure, lands well above the reciprocating equivalent on a dollar-per-kW basis, but is competitive on lifecycle cost when service intervals, oil, and coolant are eliminated. The 5-year plan shifts unplanned-maintenance risk to the OEM, a meaningful variable for CHP operators running 8,000+ hours per year.
Cost drivers that move the price the most
First, fuel system and emissions tier. Direct fuel injection with electronic air/fuel ratio control (QSJ2.4G) and EU IIIA compliance carry a price premium over a non-certified open skid [S1]. Second, certification geography: EPA-certified North America stock and EU IIIA configurations are sold as separate model codes (C20N6, C25N6, C30N6, C36N6, C40N6), so buyers should match certification to the destination, not assume cross-acceptance [S1]. Third, enclosure class: aluminum powder-coat sound-attenuated enclosures rated to 150 MPH wind add roughly 15 to 25 percent over an open skid in typical channel pricing. Fourth, controls: NFPA 110 Level 1 compliance (single-step full-rated load acceptance) is a discrete line item on the QSJ2.4G family, and is mandatory for most North American standby applications in commercial and light-industrial sites [S1].
Engine architecture is the second-order driver. A four-cycle reciprocating engine with alternator (QSJ2.4G) and a microturbine with air bearings (C30) are not economically comparable on capital cost per kW; they are comparable on $/MWh over a defined duty cycle. The Capstone platform eliminates oil changes, coolant, and most scheduled parts, with the trade-off being higher unit cost and a 50 to 60 percent electrical efficiency penalty relative to a modern reciprocating CHP unit at full load.
Reciprocating vs microturbine vs diesel: a criteria comparison
Four decision criteria matter for a 2026 gas genset selection: fuel cost per kWh produced, service interval, emissions certification, and acoustic/footprint envelope. On fuel cost, both reciprocating and microturbine gas sets benefit from natural gas pricing lower than diesel on an energy-equivalent basis; the microturbine has higher specific fuel consumption, so its running cost per kWh is higher at full load. On service interval, microturbines run 8,000-hour major service versus 250 to 500 hours for reciprocating gas units, a 16:1 advantage. On emissions, EU IIIA-certified reciprocating sets and ultra-low-emission microturbines both clear most non-attainment permitting in 2026. On footprint, the C30 is roughly 1.5 m²; the QSJ2.4G skid with enclosure is closer to 4 m². For context on how a diesel standby set stacks up against a gas set on the same criteria, see the diesel generator set selection guide and the standby generator selection guide. [S2]
Total cost of ownership: where the money actually goes
Purchase price on a $ / kW basis is the least informative line. For a 30 kW class natural gas set running 2,000 standby hours per year over a 15-year life, fuel dominates at roughly 60 to 70 percent of lifetime cost, maintenance and consumables 15 to 20 percent, and capital (depreciated) only 10 to 20 percent. Microturbine economics invert slightly: higher capital cost is offset by near-zero scheduled maintenance, but the 5-year factory protection plan (renewable) should be modelled as an annualised operating expense, not a one-time capital add. [S2]
Installation cost is highly site-specific but routinely adds 30 to 50 percent of equipment cost for gas sets, including gas train, venting, ATS, foundation, and switchgear. Permitting and emissions certification can run 5 to 10 percent of project cost in jurisdictions requiring source testing. For a standby generator pricing reference with kW-tier breakdowns, the same fuel-cost-dominates pattern holds across diesel, gas, and bi-fuel SKUs.
What the spec sheet does not tell you
Three things are commonly missed at the RFQ stage. First, ambient derating: the QSJ2.4G family is rated to 50 °C with the standard cooling package, but a black-enclosure rooftop install in Phoenix or Riyadh needs the optional high-ambient radiator, which is rarely included in the headline price [S1]. Second, fuel flexibility: the QSJ2.4G platform runs on natural gas, propane, or LPG variants, but the model code changes (C20N6 vs C25N6 for propane), and the factory protection plan on a microturbine may not extend to propane without an OEM-approved fuel gas train [S1][S2]. Third, harmonic and load-step performance: the QSJ2.4G alternator is rated for non-linear load with low waveform distortion and 2/3-pitch windings; specifying a non-OEM alternator to save cost typically voids NFPA 110 compliance and the factory emissions certification [S1].
Standards and certification touchpoints
NFPA 110 Level 1 governs the single-step full-rated load acceptance and the alarm/shutdown logic embedded in the PowerCommand 1.1 control on QSJ2.4G sets [S1]. EU IIIA emissions certification applies to the EU-configured variants of the same family, and EPA certification to the North American variants; these are not interchangeable [S1]. For grid-parallel CHP and microgrid applications, additional interconnection standards (IEEE 1547 family in North America, country-specific G99 in the UK, VDE-AR-N 4105 in Germany) are required beyond the genset rating; the Capstone C30 explicitly carries "integrated utility synchronization and protection" as a feature, which materially shortens the interconnection engineering package [S2]. Engine ratings and standby definitions follow ISO 8528-1 conventions across the QSJ2.4G and C30 platforms.
Trackable signals for the next procurement cycle: (1) FOB Shanghai natural gas genset pricing on the 20 to 60 kW tier, which has held within a 7 percent band since June 2026; (2) EU IIIA vs EPA variant lead times, which diverge by roughly 8 to 12 weeks in 2026 due to certification renewal cycles; (3) microturbine factory protection plan renewal rates, which are the leading indicator of CHP operator confidence in 8,000-hour major-service economics. Engineers specifying gas gensets alongside rotating equipment should also reference the related AC motor lifespan and failure modes guide when sizing VFD-driven auxiliary loads.
The underlying component specifications are covered under lighting equipment and electric lamps, linear guide, and crossed roller guide.