Mainspring – Linear Generator

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Mainspring – Linear Generator

Any Fuel, Any Size, Any Load, Anywhere

About the Company:

Driven by their vision of the affordable, reliable, net-zero carbon grid of the future, Mainspring has developed a new category of power generation — the linear generator — that delivers onsite, fuel-flexible power to accelerate the transition to the future grid.

About the Solution:

The Mainspring Linear Generator – distinct from an engine, microturbine, or fuel cell – directly converts motion along a straight line into electricity using chemical energy.

High Efficiency - Direct conversion of linear motion into electricity

Mainspring’s linear generator is designed to enable high expansion of reacted gases and to electrically control the conversion of linear motion directly into electricity. High expansion allows for maximum extraction of reaction energy, and direct conversion eliminates mechanical losses — combining to enable high efficiency operation across all power output levels from 0 to 100%.

Near-Zero NOx Emissions - Low-temperature reaction without a flame

Mainspring’s linear generator uses a low-temperature, uniform reaction that maintains peak temperatures below the levels in which NOx forms (1500°C), resulting in near-zero NOx emissions. This is in contrast to the burning of a fuel with a flame, which creates high temperatures and high NOx emissions.

Fuel Flexible - Continuous, adaptive control without mechanical constraints

Mainspring’s linear generator technology continuously adjusts compression and expansion, allowing it to dynamically adjust for varying fuel quality and different types of fuels, including renewable fuels such as biogas, green ammonia, and green hydrogen.

Low Capital & Maintenance Costs - Standard materials, only two moving parts, and no oil

Mainspring’s linear generator is made out of standard materials with only two moving parts and operates without the use of oil or expensive fuel cell catalysts or complex engine mechanical systems — resulting in low capital and maintenance costs.

Turn-Key Packaging - Built-in grid-tie inverters and auxiliaries

Mainspring’s linear generator products combine grid-tie inverters and auxiliaries into turn-key packages for fast and simple installation. Designed for commercial businesses, Mainspring's first product is packaged in a standard 20’ container.

Mainspring 3601 Haven Avenue Menlo Park, CA United States Visit Company Website

Solution Type

  • AD Support


  • Equipment Vendor


  • Energy


  • GHG

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Solution Strengths, Weaknesses and Critical Indicators

Anaerobic Digester Associated Technology:

NOTE: There are several technology types that are used as part of an integrated manure management system that includes an anaerobic digester and are not applicable to manure management in other cases. The impact of these technologies on the critical indicators are represented as those of an entire anaerobic digester system.


  • Long usable life and can be run reliably
  • Creates energy and generates environmental credits
  • Requires proper preparation of the feedstock
  • Requires other technologies for energy utilization
  • Requires other technologies for digestate handling
  • Proper feeding & system monitoring is required to avoid system downtime
  • Proven technology for odor control, GHG reduction and pathogen reduction

Newtrient Comments/Opinions:

Mainspring has recently been added to the Newtrient catalog. Newtrient will continue to work with Mainspring to further refine the cost and performance information on their solution. Newtrient will update this entry as more information becomes available and as new commercial dairy installations come online.

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