Mainspring Energy
Mainspring Energy is a Menlo Park-based power infrastructure company that designs and manufactures fuel-flexible, low-emission linear generators using a patented non-combustion reaction. It serves utilities, data centers, enterprises, industrial operators, and government customers with modular, dispatchable onsite power.
- Company typePrivate
- Founded2010
- HeadquartersMenlo Park, United States
- Headcount251–500
- GTM typeB2B
- OfferingHardware or Manufacturing
What Mainspring Energy does
Mainspring Energy is a Menlo Park-based power infrastructure company that designs and manufactures a fuel-flexible linear generator built around a patented non-combustion reaction called the Adaptive Pressure Cycle. The generator compresses air and gaseous fuel until a uniform low-temperature reaction occurs, pushing oscillators through copper coils 13 times per second to produce electricity, with only two moving parts, no water consumption, and near-zero NOx emissions (<1.5 ppm) achieved without aftertreatment. Standardized 250 kW cores are factory-built and combined into modular configurations, most commonly a 3 MW stack of 12 units, that scale from single-site deployments to 100+ MW arrays for utility, data center, enterprise, industrial, and government customers.
Mainspring sells its Linear Generator through two procurement models: direct purchase (eligible for a 30% federal Investment Tax Credit through 2032) and financed solutions with monthly payments via partner lenders, complemented by turnkey site planning, permitting, installation, and service/maintenance contracts. Its GTM is enterprise field sales supported by a global channel partner network that includes Schneider Electric, ABM, NextEra Energy Resources, and DLR Group, alongside a broader roster of resellers and engineering firms. Named customers span hyperscale-adjacent data center operators (EdgeConneX, Amazon, Lineage Logistics), retail and logistics enterprises (Kroger, Prologis/Maersk, Lineage), utilities and public power (PG&E, UMPA, LID, MBEC, Napa Sanitation District), industrial/biogas operators (CalBio dairy digesters, oil and gas applications), and government/military (U.S. Air Force at Travis AFB, San Diego Community College District, Stony Brook/LIPA). To date the company has raised more than $800 million in equity and grant financing across Series D ($95M, 2021), Series E ($290M, 2022), a $87M U.S. Department of Energy award (2024), and Series F ($258M, 2025), and operates from Menlo Park with a new manufacturing plant under development near Pittsburgh.
Commercial shipments began in 2020 after roughly a decade of R&D originating from Stanford University doctoral work. As of 2025-2026 the company reports hundreds of megawatts in field operations and more than a gigawatt in advanced development for Fortune 500 companies, data centers, and utilities across the United States, with active expansion into Mexico, Puerto Rico, and the Bahamas. In June 2026 former Cummins Chairman & CEO Tom Linebarger was appointed Chairman & CEO, with founder Shannon Miller transitioning to President, explicitly to accelerate growth in AI data center and utility power infrastructure markets.
Mainspring Energy firmographics
Firmographics- Name
- Mainspring Energy
- Legal name
- Mainspring Energy, Inc.
- Website
- https://mainspringenergy.com
- Company type
- Private
- Founded year
- 2010
- Operating status
- Operating
- Headcount range
- 251–500 employees
- Short description
- Mainspring Energy is a Menlo Park-based power infrastructure company that designs and manufactures fuel-flexible, low-emission linear generators using a patented non-combustion reaction. It serves utilities, data centers, enterprises, industrial operators, and government customers with modular, dispatchable onsite power.
- Ownership category
- akta.pro rank
Mainspring Energy industry classification
Industry- Product category
- Distributed Power Generation Equipment
- NAICS
- Electric Power Generation (22111), Turbine and Turbine Generator Set Units Manufacturing (333611), Other Electric Power Generation (221118)
- SIC
- Cogeneration Services & Small Power Producers (4991), Engines & Turbines (3510), Switchgear & Switchboard Apparatus (3613), Electric Services (4911)
- akta.pro primary industry
- Dispatchable Distributed Generation (Gas Reciprocating Engines, Microturbines) (EUACALAI)
- akta.pro secondary industries
- Microgrid & Distributed Grid Equipment (Controllers, Switchgear Packages, DER Interconnection) (IMAGAAAJ), Backup & Resilience Power Systems (Standby Generators, Critical Facilities) (EUACALAG), Cables, Connectors & Electrical BOS Components Manufacturing (MV/HV, Subsea, Harnesses) (EUAMAHAK), Energy Management Systems & Plant Controllers (PPC, AGC Participation, Curtailment Control) (EUAMAIAI), Medium/Low-Voltage Power Distribution (MCCs, Panels, UPS, Grounding) (EUAEAFAB)
Keywords
Where Mainspring Energy is headquartered
LocationHeadquarters
- HQ city
- Menlo Park
- HQ country
- United States
- HQ region
- North America
Offices5 records
Markets served
Mainspring Energy business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Technology or R&D, Supply Chain, Operations, Personnel, Marketing or Sales, Infrastructure
Revenue model
- Direct Purchase (Hardware Sales): Customers can buy the Mainspring Linear Generator outright to take advantage of available incentives, long-term economic value, and maintain ownership of the asset. Standardized 3 MW configuration (12x0.25 MW units) plus custom configurations sold at capital price.
- Financed Solutions: Flexible financing structures with Mainspring financing partners that reduce upfront capital expenditure and deliver predictable monthly payments; can replace traditional utility bills with manageable expenses.
- Service and Maintenance Contracts: Turnkey maintenance from Mainspring or flexible service offerings covering the modular linear generator fleet.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Multi-year contract | Direct purchase with 30% Federal ITC through 2032 |
| Subscription | Monthly | Financed solution with predictable monthly payments |
| Unit Pricing | Multi-year contract | 30% ITC eligible, lowest cost of ownership among dispatchable options |
Go-to-market motion1 record
Distribution channels3 records
Marketing channels8 records
Mainspring Energy product offering
Product offeringCore offering
Mainspring Energy designs, manufactures, and sells the Mainspring Linear Generator, a fuel-flexible, modular power generator built around its patented Adaptive Pressure Cycle™ — a low-temperature, non-combustion reaction that converts gaseous fuels directly into electricity. Modular 250 kW cores scale from a single unit to 100+ MW deployments across data center, utility, commercial/industrial, and government customers, with options for direct purchase (qualifying for a 30% Federal ITC through 2032) or financed monthly-payment solutions paired with maintenance services.
Product overview
Mainspring Energy's product portfolio is anchored by a single core platform — the Mainspring Linear Generator (LGen) — which is built around the company's patented Adaptive Pressure Cycle™ technology. Rather than offering a multi-product platform, Mainspring delivers one standardized, factory-built 250 kW core (12 cores make up a 3 MW configuration) that is replicated and scaled into modular deployments ranging from a single unit to 100+ MW arrays across four vertical solutions: Data Center, Utilities, Enterprise, and Industrial. These vertical solutions are not separate products but packaged applications of the Linear Generator with tailored value propositions (e.g., microgrids, solar firming, EV charging, wastewater-to-power, dairy biogas). Mainspring commercializes the platform through two procurement options — Direct Purchase (eligible for a 30% Federal Investment Tax Credit through 2032) and Financed Solution — and complements the hardware with turnkey services spanning site planning, permitting, installation, and maintenance.
Differentiator
Problem solved
Functional benefit
Brands
- Mainspring Linear Generator: The company's flagship product family — fuel-flexible, fully dispatchable linear generators that produce near-zero NOx emissions and use no water. Modular design with 250 kW cores that scale from a single unit to 100+ MW deployments.
Products and services
- Mainspring Linear Generator (LGen) A fuel-flexible, fully dispatchable linear power generator that converts fuel directly into electricity via a low-temperature, flameless, non-combustion reaction. It operates on natural gas, biogas, propane, hydrogen, and other gaseous fuels with near-zero NOx emissions, no water use, and only two moving parts. Modular 250 kW cores scale from a single unit to grid-level arrays delivering 250 kW to 100+ MW for data center, utility, commercial/industrial, and government customers.
- Mainspring Linear Generator 3 MW Configuration Standardized 3 MW factory-integrated configuration featuring 12 x 0.25 MW Linear Generators with skid-mounted inverters and an optional step-up transformer; electrical architecture accelerates deployment and lowers installed cost for utility, data center, and large commercial/industrial projects.
- Mainspring Direct Purchase Procurement Option Outright purchase option for the Mainspring Linear Generator enabling customers to take advantage of a 30% Federal Investment Tax Credit (ITC) for projects through 2032, capture long-term economic value, and maintain ownership of the asset.
- Mainspring Financed Solution Financing structure for the Mainspring Linear Generator offered with Mainspring financing partners that reduces upfront capital expenditure and delivers predictable, manageable monthly expenses that can replace traditional utility bills.
- Mainspring Service and Maintenance Contracts Turnkey maintenance from Mainspring or flexible service offerings covering the modular linear generator fleet for data center, utility, commercial/industrial, and government customers.
- Mainspring Data Center Power Solution Vertical solution built on the Mainspring Linear Generator for hyperscale, colocation, and edge data center operators, providing fuel-resilient, low-emissions onsite generation that supports fast modular construction, accelerated permitting, dispatchable microgrids, and behind-the-meter resilience.
- Mainspring Utility Power Solution Vertical solution built on the Mainspring Linear Generator for electric utilities (municipal, cooperative, investor-owned), providing firm, flexible, dispatchable near-to-load capacity with near-zero NOx emissions, fast ramping, solar/wind firming, and high availability.
- Mainspring Enterprise Power Solution Vertical solution built on the Mainspring Linear Generator for commercial and enterprise customers (retail, logistics, healthcare, EV charging, food and beverage, education), delivering onsite prime power with low and predictable LCOE, grid-independent operation, and the ability to transition to renewable fuels.
- Mainspring Industrial Power Solution Vertical solution built on the Mainspring Linear Generator for industrial operators in oil & gas, wastewater, agriculture, landfill, and other sectors, enabling monetization of non-standard fuels (biogas, field gas, associated gas) with near-zero NOx and grid-independent microgrid capability.
Quantifiable outcome
- 40% lower electricity rates delivered at Lathrop Irrigation District vs PG&E
- +8 more outcomes
Companies that use Mainspring Energy
Customer profileNamed customers14 records
Segments5 records
Ideal customer profiles5 records
Mainspring Energy technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration6 records
Feature8 records
Mainspring Energy partnerships and signals
Strategic signalPartnerships
15 partnerships are on record, tiered flagship, minor and core.
- Schneider ElectricflagshipPartnership for hybrid energy solutions targeting commercial and industrial customers, leveraging Schneider's microgrid and energy management expertise with Mainspring's Linear Generator. Jana Gerber is President of Schneider Electric North America Microgrid.
- ABMflagshipStrategic partnership announced October 2024 to integrate Mainspring's power generation tool with ABM's EV charging solutions, strengthening end-to-end EV fleet charging infrastructure.
- AEDGminorListed strategic partner in Mainspring's professional partner network.
- dGEN Energy PartnersminorListed strategic partner in Mainspring's professional partner network.
- Gould GroupminorListed strategic partner in Mainspring's professional partner network.
- INF AssociatesminorListed strategic partner in Mainspring's professional partner network.
- Kinsley Energy SystemscoreAnnounced partnership with Mainspring Energy on May 7, 2025 to expand channel network as linear generator installations grow.
- Outlier EnergyminorListed strategic partner in Mainspring's professional partner network.
- PrismecsminorListed strategic partner in Mainspring's professional partner network.
- Regatta SolutionsminorListed strategic partner in Mainspring's professional partner network.
- Hartman EngineeringminorListed strategic partner in Mainspring's professional partner network.
- DLR GroupcoreEarly-momentum partnership with Mainspring Energy on linear generator technology as part of DLR Group's global Infrastructure practice launch announced April 2026.
- CrusoeminorCo-mentioned with Mainspring Energy as companies attracting significant funding to support sustainable data center transition (May 2025).
- LanciumminorCo-mentioned with Mainspring Energy as companies attracting significant funding to support sustainable data center transition (May 2025).
- LightmatterminorCo-mentioned with Mainspring Energy as companies attracting significant funding to support sustainable data center transition (May 2025).
Scale indicators10 records
Recent moves8 records
Expansion highlights6 records
Mainspring Energy competitors and assessment
Company assessmentDirect peers
- Bloom Energy: Bloom Energy manufactures solid-oxide fuel cell power systems for data centers, utilities, and commercial customers. It is the most direct competitor to Mainspring in the fuel-flexible, low-emissions onsite generation category, particularly for AI data center power where Bloom has secured large contracts with Equinix, AEP, and hyperscalers.
- Capstone Green Energy: Capstone manufactures microturbine power generation systems used in oil and gas, wastewater, landfill gas, and commercial applications. Its low-emission microturbines compete with Mainspring in biogas-to-power and behind-the-meter industrial microgrids, though Capstone products have different emissions and efficiency profiles.
- Enchanted Rock: Enchanted Rock provides natural gas-powered resiliency microgrids and behind-the-meter generation to commercial and industrial customers in Texas and beyond. It competes with Mainspring in the enterprise primary power and microgrid segment, though its technology is based on conventional reciprocating engines.
Broad incumbents
- Caterpillar (Electric Power division): Caterpillar is one of the world's largest manufacturers of gas and diesel generator sets for prime, standby, and distributed power applications. Its Cat G3520 and GCM34 gas gensets compete directly with Mainspring in the utility, data center, and industrial prime power segments, though they rely on conventional combustion rather than a non-combustion cycle.
- Cummins: Cummins is a global leader in diesel and natural gas generator sets as well as hydrogen fuel cells through its Accelera joint venture. Notably, Mainspring's CEO Tom Linebarger is the former Chairman & CEO of Cummins, and Cummins' legacy gas genset product line competes with Mainspring's Linear Generator for utility and enterprise prime power customers.
- Generac Industrial Power: Generac is the dominant U.S. manufacturer of backup and prime power generators up to multi-MW scale, including the new industrial natural gas platform. It competes with Mainspring in commercial/industrial microgrids and behind-the-meter applications, though Generac's products are conventional combustion-based and primarily serve standby rather than dispatchable prime power.
- Wärtsilä: Wärtsilä is a Finnish manufacturer of flexible gas and multi-fuel engines for utility-scale balancing and grid services. Its engine plants compete with Mainspring's utility power solution for dispatchable capacity additions and grid balancing, though Wärtsilä's engines rely on conventional combustion cycles.
- INNIO (Jenbacher / Waukesha): INNIO manufactures Jenbacher gas engines for utility, industrial, and data center applications and Waukesha engines for gas field operations. Its products overlap with Mainspring in biogas, landfill gas, and natural gas distributed generation, with both hydrogen-ready engine variants in development.
- Rolls-Royce Power Systems (MTU / mtu Solutions): Rolls-Royce's MTU brand supplies gas and diesel gensets for data centers, utilities, and microgrids globally, with growing hydrogen-ready engine offerings. Its products compete with Mainspring in the data center backup and prime power segment where hyperscalers are increasingly evaluating behind-the-meter generation.
Others
- Schneider Electric: Schneider Electric is Mainspring's flagship microgrid integration partner, embedding Linear Generators into its EcoStruxure microgrid offerings for commercial and industrial customers. While not a direct competitor, Schneider competes in adjacent energy management and battery storage spaces that often pair with Mainspring's hardware in customer deployments.
Market position
Strengths2 records
Weaknesses4 records
Competitive moat6 records
Key risks5 records
Key highlights7 records
Customer concentration
Mainspring Energy social profiles
Digital presenceMainspring Energy compliance and trust
Trust signalCompliance2 records
Mainspring Energy financial estimates
Financial estimateRevenue estimate
Valuation estimate
Mainspring Energy leadership team
Management profileNumber of profiles
Profiles8 records
Mainspring Energy funding detail
Funding detailFunding overview
Funding rounds8 records
Investors30 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Mainspring Energy M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Mainspring Energy
What does Mainspring Energy do?
Mainspring Energy designs, manufactures, and sells the Mainspring Linear Generator, a fuel-flexible, modular power generator built around its patented Adaptive Pressure Cycle™ — a low-temperature, non-combustion reaction that converts gaseous fuels directly into electricity. Modular 250 kW cores scale from a single unit to 100+ MW deployments across data center, utility, commercial/industrial, and government customers, with options for direct purchase (qualifying for a 30% Federal ITC through 2032) or financed monthly-payment solutions paired with maintenance services.
Is Mainspring Energy a public or private company?
Mainspring Energy is a private company. It is classified as venture growth investor backed and is currently operating.
When was Mainspring Energy founded?
Mainspring Energy was founded in 2010. It employs 251 to 500 people.
Where is Mainspring Energy based?
Mainspring Energy is headquartered in Menlo Park, United States, in the North America region.
How does Mainspring Energy make money?
Three revenue lines are on record. Direct Purchase (Hardware Sales) is the primary driver. The others are financed Solutions and service and Maintenance Contracts.
Who are Mainspring Energy's main competitors?
Direct peers on record are Bloom Energy, Capstone Green Energy and Enchanted Rock. Broad incumbents are Caterpillar (Electric Power division), Cummins, Generac Industrial Power, Wärtsilä, INNIO (Jenbacher / Waukesha) and Rolls-Royce Power Systems (MTU / mtu Solutions). Schneider Electric is listed as an others.
Does Mainspring Energy have an API?
No public API is recorded for Mainspring Energy.
What industry is Mainspring Energy in?
Mainspring Energy's product category is Distributed Power Generation Equipment. Its primary akta.pro industry code is EUACALAI, Dispatchable Distributed Generation (Gas Reciprocating Engines, Microturbines), with a secondary code of IMAGAAAJ, Microgrid & Distributed Grid Equipment (Controllers, Switchgear Packages, DER Interconnection). Its NAICS code is 22111 and its SIC code is 4991.