Any Fuel, Any Size, Any Load, Anywhere

The Mainspring Linear Generator delivers unmatched flexibility for the grid transition, including the ability to switch between fuels like hydrogen, ammonia, and biogas with software, and quickly track and firm renewables with its full dispatchability. Whether deployed as a single unit or as a grid-scale array, the technology is easy to permit and interconnect in any jurisdiction, allowing for broad impact across a wide range of use cases on both sides of the meter.

“Kroger’s deployment of Mainspring at our stores advances our environmental, social and governance efforts while reducing operating costs, helping us better serve our associates, customers, and communities”

Denis George, Manager – Energy, The Kroger Co.

“This is a low-emission, resilient, and affordable alternative that holds a lot of promise for our future.”

Jason Glickman, Executive Vice President, Engineering, Planning & Strategy, PG&E

Markets & Applications

The unmatched combination of low cost and low emissions combined with high efficiency, fuel flexibility, and full dispatchability make the Mainspring Linear Generator the ideal choice for customers looking for clean and reliable power for the zero carbon future.

Mainspring products and inverters are UL listed, streamlining the permitting and interconnection processes while firming intermittent renewables.

Commercial & Industrial

Mainspring Linear Generators are designed to flexibly operate to meet your cost savings, sustainability, and resiliency needs. Full dispatchability and dynamic fuel switching enable you to meet your goals today and in the future.

  • 24/7 load-following, primary power operation when needed
  • Reliable power even when the grid is down
  • Economic dispatch based on tariff or real-time pricing
  • Peak-load shaving for demand charge reduction
  • Onsite solar and energy storage firming

Grid Infrastructure

For utilities, municipalities, and power project developers, Mainspring’s Linear Generators are movable and offer utility-scale performance for any project size. The low emissions, modularity, and fuel flexibility of Mainspring’s products reduces the permitting and stranded asset risks associated with large generation and transmission projects.

  • Meet capacity needs with a distributed network of systems that alleviate congestion constraints, firm renewables, and add local resiliency
  • Avoid or defer T&D upgrades by placing high-performance, fuel-flexible capacity with precision
  • Charge electric vehicle (EV) fleets while avoiding expensive and multi-year system upgrades


The Mainspring Linear Generator is the ideal backbone for any microgrid. With any fuel available, our products can seamlessly integrate with solar, energy storage, and microgrid controllers to provide load balancing while parallel to or islanded from the grid.

  • Municipal infrastructure
  • Hospitals and healthcare facilities
  • Shipping ports
  • Data centers
  • University campuses
  • Military bases
  • Residential communities


Mainspring is proud to work with global leaders. A selection of our customers includes:

Purchase Options

We currently offer customers two purchase options to realize the benefits of Mainspring’s Linear Generators — direct capital purchase or a financed solution such as an Energy Services Agreement / Power Purchase Agreement. Both options come with a Mainspring-supported Maintenance Agreement.

Direct Purchase

Customers looking to maximize cost savings and return on investment can directly purchase and own a Linear Generator. Mainspring works with customers to facilitate the installation, providing installation support or delivering full turn-key projects.

Energy Services Agreement

Mainspring has partnered with NextEra Energy Resources to provide customers a financed option for turn-key linear generator projects. With this option, customers can realize immediate benefits of Mainspring systems with no upfront costs.

Product Specifications

Utility-scale Performance for Any Project Size

    Inverter-based Technology

    Easy, Modular Installation

    15 MW per Acre Scalability

Each base package contains two linear generator cores, operating in tandem

Download Datasheet
Illustration of Mainspring Generator
  • Outputs

    480 V, 3 Phase, 60/50 Hz
    Large-Scale Projects:
    >1.5 MW, net AC
    External Inverters
    Base Package:
    230 kW, net AC
    Internal Inverters

  • Inputs

    Natural Gas or Biogas
    w/up to 30% H2 Blend1
    8-25 psig Inlet Pressure
    No Water

  • Performance

    45% Efficiency, Net AC2
    Load Tracking
    Zero to Full Power

  • Emissions

    NOx < 2.5 ppmvd3
    Sound < 70 dBA @ 6 ft

  • Physical

    Large-Scale Projects:
    >15 MW/acre
    Base Package:
    20.5’ x 8.5’ x 9.5’ (L,W,H)

  • Other

    UL 2200 Package
    UL 1741 SA Inverters
    Remote Monitoring

1. 100% hydrogen and 100% ammonia capable. Contact us to learn more.
2. Measured according to ASME PTC 50 at 15 C and 1 atm
3. Products comply with emissions limits in South Coast AQMD


  • Guidehouse White Paper

    Introducing Linear Generators to the Rapidly Evolving DER Landscape

  • E3 White Paper

    The Role of Firming Generation in Microgrids

    A California Case Study, Analyzing Four Microgrid Technology Configurations

  • Webinar: Smart Energy Decisions

    Kroger Discusses its Mainspring Linear Generator Deployments

    Cost, Resilience and Sustainability Benefits of the Latest DER Technology. A free one-hour webinar by Smart Energy Decisions

    View Webinar
  • Webinar: GreenBiz

    Renewable and Resilient Energy in Commercial Buildings

    Lineage Logistics discusses its deployment of 330 MW of rooftop solar and two Mainspring Linear Generators at a cold storage facility in Colton, CA.

    View Webinar