Generate cost savings and increase resilience while meeting your sustainability goals

The Mainspring Linear Generator delivers fully dispatchable and fuel-flexible onsite power that increases resiliency and accelerates the transition to renewable fuels. Our products serve a wide range of applications on both sides of the utility meter.

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

Denis George, Manager – Energy, The Kroger Co.

Markets & Applications

The unmatched combination of low cost, high efficiency, low emissions, fuel flexibility, and full dispatchability make the Mainspring Linear Generator the ideal choice for customers looking to reduce energy spend, increase resiliency, and meet sustainability goals.

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

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
  • 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 offer utility-scale performance at distributed scale. The low emissions and modularity 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, 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. Our products can seamlessly integrate with solar, energy storage, and microgrid controllers to provide load balancing while grid parallel 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 cost, resilience, and sustainability benefits of Mainspring’s Linear Generators — direct capital purchase or an Energy Services 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 financing option for turn-key Linear Generator projects. With our Energy Services Agreement, customers can realize immediate cost savings, with no upfront costs, by only paying for electricity produced over the term of the agreement.

Product Specifications

Utility-scale Performance in the Size of a Parking Space

    Easy Installation

    One Fuel Connection

    One Electrical Connection

Each package contains two linear generator cores

Download Datasheet
Illustration of Mainspring Generator
  • Outputs

    230 kW, net AC
    480 V, 3 Phase, 60 Hz

  • Inputs

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

  • Performance

    45% Efficiency, Net AC1
    Load Tracking
    Zero to Full Power

  • Emissions

    NOx < 2.5 ppmvd2
    Sound < 70 dBA @ 6 ft

  • Physical

    20.5’ x 8.5’ x 9.5’ (L,W,H)

  • Other

    UL 2200 Package
    UL 1741 SA Inverters
    Remote Monitoring

1. Measured according to ASME PTC 50 at 15 C and 1 atm
2. Products comply with emissions limits in South Coast AQMD
All data is subject to technical development and modification.


  • 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

Customer Inquiries

If you think that a Mainspring Linear Generator might be a good fit for your organization, we would love to hear from you. Please send us some basic information about you and an indicative facility where a Linear Generator would run.

Facility Peak Demand (kW)
Facility Annual Energy (kWh)