Mainspring Energy Secures $150 Million Contract for Innovative Linear Generator

Mainspring Energy, the firm pioneering a novel generator technology compatible with fuels such as biogas and hydrogen, has announced its Mainspring Linear Generator. This unveiling coincides with a substantial $150 million contract awarded by NextEra Energy Resources.

A Step Towards a Zero-Carbon Grid

The company’s core technology signifies a considerable advancement in the pursuit of a zero-carbon power infrastructure. Its unique capability lies in seamlessly transitioning between conventional natural gas and renewable alternatives like biogas and hydrogen.

Currently, Mainspring’s generators are deployed under contract with a prominent national supermarket chain, powering 30 of its retail locations. Pilot unit shipments commenced in June, with full commercial distribution slated for mid-2021, as per a company announcement.

Origins and Design Principles

The foundational research for this technology was conducted at a thermodynamics laboratory at Stanford University. Co-founders Shannon Miller, Matt Svrcek, and Adam Simpson spearheaded the initial development efforts.

The generator’s design facilitates the replacement of traditional diesel generators and enhances the resilience of industrial facilities during natural disasters.

How the Linear Generator Works

Unlike conventional engines, microturbines, and fuel cells, Mainspring’s linear generator directly converts linear motion into electricity utilizing heat or chemical energy. Specifically, a controlled, low-temperature reaction between air and fuel propels magnets through copper coils, generating electrical power.

High efficiency and dispatchable power are achieved through a combination of the generator’s design and proprietary control software. Notably, the system operates without producing nitrogen oxide emissions, a common byproduct of other generator types.

Investor Confidence and Funding

The innovative technology has attracted investment from prominent figures like Bill Gates and Vinod Khosla’s Khosla Ventures. Furthermore, interest has been shown by companies within the oil and gas sector, such as Equinor, and utility providers like American Electric Power.

To date, Mainspring, formerly known as Etagen, has secured over $80 million in funding.

Comparison to Other Startups

Mainspring’s approach to energy generation, which minimizes the need for intricate mechanical systems or catalysts, aligns with other startups like Turntide Technologies – backed by Robert Downey Jr. and Bill Gates – that focus on delivering streamlined, software-driven solutions for motor and generator technologies.

Cost-Effectiveness and Maintenance

The generators achieve reduced capital and maintenance expenses through the utilization of readily available materials, a design incorporating only two moving parts, and an innovative air bearing system that eliminates the requirement for lubricating oil. Complex mechanical systems and costly catalysts are not needed for operation.

The system’s ability to quickly respond to grid conditions – ramping up and down as needed – makes it an ideal complement to solar power and battery storage solutions.

Energy Savings and Service Model

“A key motivator for our customers, beyond carbon reduction, is the potential for cost savings compared to current grid electricity prices,” stated Miller. “Our products can deliver significant savings to commercial customers, typically through an Energy Services Agreement, where customers experience annual savings from the first year without any upfront investment.”

Product Specifications and Future Development

Mainspring’s initial commercial product boasts a rated output of 250 kW and is housed within a standard 8′ x 20′ container. Each package integrates two 125 kW linear generator cores, alongside UL-listed grid-tie inverters and auxiliary components, providing a complete, turn-key solution.

Future iterations will offer increased power output, catering to the needs of industrial businesses, data centers, hospitals, smart cities, and utility-scale grid applications.

NextEra Energy Resources Partnership

“Commercial and industrial customers, as well as utilities, are seeking clean, dependable power generation with the flexibility to transition to 100% renewable fuels like biogas and hydrogen as they become accessible,” commented John Ketchum, President and CEO of NextEra Energy Resources. “Mainspring’s ability to integrate clean onsite generation with renewables and the grid makes us excited to support the launch of this groundbreaking product.”