Product
Local power, redefined.
A power generator that is fuel-flexible, fully dispatchable, uses no water, and emits near-zero NOx.
Radically simple. Factory built.
Fuel flexible
Seamlessly switch between natural gas, RNG, biogas, propane, and hydrogen.
Dispatchable
Quickly ramp output to meet variable workloads and enable grid independent operations.
Low emissions
Produce electricity with near-zero NOx and meet even the most stringent air quality standards.
Modular
Enable faster deployment timelines with factory-built units that are quick to install.
Low maintenance
Minimize downtime with modular design, only two moving parts and no oil.
<1.5 ppm
NOx
Low NOx emissions without the need for aftertreatment.
0–100%
DISPATCHABILITY
Capable of operating grid independent or grid parallel.
46%
EFFICIENCY
Across all deployment sizes: from hundreds of kilowatts to hundreds of megawatts.
>500 MW
IN LATE-STAGE DEVELOPMENT AND OPERATION
Leading Fortune 500 companies, data center developers, and utilities trust Mainspring.
Performance comparison across technologies.
Radically simple. Factory built.
Mainspring offers a standardized 3 MW configuration featuring 12x0.25 MW Linear Generators, factory-integrated, skid-mounted inverters and an optional step-up transformer, with a consistent electrical architecture that accelerates deployment and lowers installed cost. Configure and scale to meet your unique capacity demands.
Outputs¹
| Power (net AC) | 3 MW |
|---|---|
| Electrical | 3-phase AC, 50/60 Hz |
| 400/480 V natively | |
| 12.47, 25, or 34.5 kV with transformer |
Inputs²
| Fuels | Any blend of biogas, natural gas, hydrogen, and propane |
|---|---|
| Input pressure | 5–20 psig |
| Water consumption | None |
Efficiency³
| Electrical (LHV, net AC) | 46% |
|---|---|
| Heat rate (HHV, net AC) | 8,233 BTU/kWh |
Emissions⁴
| NOx | <1.5 ppm (<0.05 lb/MWh) |
|---|
Physical
| Unit weight | 20 t |
|---|---|
| Unit dimensions | 20.5’L x 8.5’W x 9.5’H |
| Skid weight | 10 t; 20 t with transformer |
| Skid dimensions | 31.0’L x 4.5’W x 9.0’H |
| 3 MW block dimensions | 111.0’L x 60.0’W |
Environment
| Temperature range | -30° to 50° C |
|---|---|
| Humidity | 0 to 100% |
1. Rated capacity may vary by fuel type.
2. Refer to Mainspring fuel specifications for details.
3. Measured according to ASME PTC 50 at 15° C and 1 atm on natural gas and biogas. Rated efficiency is inclusive of 1% assumed efficiency reduction for inverter and line losses to the skid and may vary by site configuration and/or fuel type.
4. Products comply with emissions limits in South Coast AQMD.
All data is subject to technical development and modification.
A linear generator converts fuel directly into electricity through a low-temperature, flameless reaction. Without combustion or complex mechanical parts, it provides high efficiency, low emissions, and quiet operation in a compact, modular system built for local generation.
A linear generator delivers fast, flexible, low-emission power with full dispatchability and seamless fuel switching. Other technologies require tradeoffs across one or more of these attributes. Fuel cells share the low-emissions profile but can’t seamlessly switch fuels or load follow, limiting their flexibility. Engines and turbines offer dispatchability but rely on combustion, which drives higher local air pollution and increases complexity.
A linear generator is fully fuel flexible, operating on natural gas, biogas, propane, field gas, associated gas, or hydrogen. It can seamlessly switch between gaseous fuels, allowing customers to maintain power during a fuel interruption and return to their primary fuel once service is restored. Unlike technologies that require major retrofits or permanent conversions, a linear generator provides true fuel redundancy without locking customers into a single fuel source.
Mainspring’s linear generators provide fast-ramping, dispatchable power that can operate independently or in parallel with the grid. Each system can serve as firm, flexible, local capacity for utilities or as onsite generation for commercial and industrial users. Linear generators can follow load, form microgrids, and balance renewable resources, all within a modular design that scales from small sites to hundreds of MWs.
Linear generators solve capacity constraints today while providing flexibility for the future. Their non-combustion design produces near-zero NOx and no particulate matter, and their high efficiency and fuel flexibility enable customers and utilities to cut emissions now and transition smoothly to zero- and low-carbon fuels like hydrogen and biogas. The result is clean, firm power that supports growth while accelerating grid decarbonization.