Jimmy
Jimmy (Jimmy Energy SAS) is a French industrial deeptech startup founded in 2020 that designs, finances, owns and operates micro-nuclear High-Temperature Reactor (HTR) thermal generators, selling decarbonized industrial process heat to gas-burning sectors such as chemistry, agri-food, sugar and paper under 20–30 year Heat-as-a-Service contracts.
- Company typePrivate
- Founded2020
- HeadquartersParis, France
- Headcount101–250
- GTM typeB2B
- OfferingServices
What Jimmy does
Jimmy (legally Jimmy Energy SAS) is a French industrial deeptech startup founded in 2020 by Antoine Guyot and Mathilde Grivet that designs, builds, finances, owns and operates micro-nuclear thermal generators to supply decarbonized process heat to industrial customers under long-term Heat-as-a-Service contracts. The core product is a High-Temperature Reactor (HTR) of 20–60 MWth built on TRISO fuel particles embedded in graphite compacts, helium-cooled and graphite-moderated, sized to fit on a 40m × 40m footprint (~6,000 m² INB zone) and able to deliver up to 500°C heat on a secondary CO₂ circuit suitable for direct substitution of natural-gas burners in chemistry, agri-food, sugar and paper processes; each deployed unit is marketed as saving up to ~100,000 t CO₂eq per year versus natural gas at 90–95% CO₂ reduction and ~95% availability.
The company monetizes the generator through 20–30 year heat purchase contracts in which Jimmy funds, installs, operates and eventually decommissions the asset on or adjacent to the customer site, decoupling customer pricing from fossil-fuel and carbon-price volatility. Industrialization is anchored at the "JimmyHub&Go" platform in Le Creusot (Saône-et-Loire), a €100M, 125,000 m² site planned to host assembly and fuel workshops and ~300 jobs by 2028. Revenue is currently nil — no commercial generator is yet in operation; the first customer project (a 10 MW unit for Cristal Union's Cristanol site in Bazancourt, Marne) is in DAC review, while supply contracts are in place with Urenco (LEU+ uranium enrichment), Toyo Tanso (IG-110 graphite), Onet Technologies (reactor vessel) and Photonis/ARCYS (precision components). The company has mobilized more than €130M since creation, split between roughly €60M of private capital (notably a €40M round in March 2026 led by Crédit Mutuel Impact with ADEME Investissement) and €72M of non-dilutive France 2030 grants across Phase 1 (€32M, 2023) and Phase 2 (€40M, 2026), making it the largest laureate of the "Innovative Nuclear Reactors" program and the first private French company to file a DAC for an industrial thermal generator.
Jimmy firmographics
Firmographics- Name
- Jimmy
- Legal name
- Jimmy Energy SAS
- Website
- https://jimmy-energy.eu
- Company type
- Private
- Founded year
- 2020
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Jimmy (Jimmy Energy SAS) is a French industrial deeptech startup founded in 2020 that designs, finances, owns and operates micro-nuclear High-Temperature Reactor (HTR) thermal generators, selling decarbonized industrial process heat to gas-burning sectors such as chemistry, agri-food, sugar and paper under 20–30 year Heat-as-a-Service contracts.
- Ownership category
- akta.pro rank
Jimmy industry classification
Industry- Product category
- Decarbonized Industrial Heat Services
- NAICS
- Power Boiler and Heat Exchanger Manufacturing (332410), Steam and Air-Conditioning Supply (22133), Turbine and Turbine Generator Set Units Manufacturing (333611)
- SIC
- Cogeneration Services & Small Power Producers (4991), Engines & Turbines (3510)
- akta.pro primary industry
- Industrial Process CHP (Refineries, Chemicals, Pulp & Paper, Metals) (EUACAKAI)
- akta.pro secondary industries
- Onsite Low-Carbon Heat & CHP (Electrified CHP, Fuel Cells, Renewable CHP) (EUABAJAI), High-Temperature Process Heat Electrification (E-Boilers, E-Furnaces, Induction, Plasma) (EUABAJAA)
Keywords
Where Jimmy is headquartered
LocationHeadquarters
- HQ city
- Paris
- HQ country
- France
- HQ region
- Europe
Offices2 records
Markets served
Jimmy business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Technology or R&D, Infrastructure, Personnel, Supply Chain, Operations, Marketing or Sales
Revenue model
- Long-term heat purchase contracts (Heat-as-a-Service): Customers sign 20- to 30-year heat purchase agreements with Jimmy; Jimmy finances, builds, owns, operates and decommissions the generator and sells decarbonized process heat to the industrial client. The entire investment is funded by Jimmy, securing recurring revenue over the asset life.
- Public funding and grants (France 2030): Non-dilutive and dilutive public financing under the France 2030 "Innovative Nuclear Reactors" program; Phase 1 (2023) granted €32M and Phase 2 (2026) granted €40M to support design, industrialization and deployment of the first generators. Functions as a strategic financing stream alongside private capital.
- Private equity and venture funding: Multiple private funding rounds (€2.2M in 2022, €15M in 2023, €40M in 2026) led or participated in by Crédit Mutuel Impact, ADEME Investissement, Otium Capital, Eren Groupe, Polytechnique Ventures, Noria, Serena, Omnes, X Ventures and CMI. Over €60M in private funds raised cumulatively since 2020.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Long-term heat purchase contract (20-30 years) |
Go-to-market motion3 records
Distribution channels2 records
Marketing channels8 records
Jimmy product offering
Product offeringCore offering
Jimmy designs, builds, finances, owns, operates and decommissions compact high-temperature nuclear micro-reactor thermal generators (HTR, 20-60 MWth, up to 500°C) using TRISO fuel and helium coolant. The company delivers decarbonized industrial process heat to industrial sites under 20-30 year Heat-as-a-Service contracts, replacing natural gas burners and saving up to ~100,000 tonnes of CO2eq per year per generator.
Product overview
Jimmy (Jimmy Energy SAS) is a French industrial deeptech startup that offers a single integrated decarbonized-heat solution built around a unified thermal generator product rather than a software platform. The core product is the Jimmy Generator, a high-temperature nuclear micro-reactor (HTR) that uses TRISO fuel and is supported by the Jimmy Industrial Platform (JimmyHub&Go) at Le Creusot, where generators are assembled. The company monetizes the generator through a turnkey Heat-as-a-Service offer consisting of long-term (20-30 year) heat purchase contracts, with Jimmy handling the entire investment, design, operation, and decommissioning. The fuel (TRISO particles in graphite compacts) and the assembly facility at Le Creusot are tightly coupled sub-products that enable the deployment of the generator. The company was founded in 2020 and is the largest winner of the France 2030 "Innovative Nuclear Reactors" call for projects, with over 130M€ mobilized in total since creation.
Differentiator
Problem solved
Functional benefit
Brands
- JimmyHub&Go: Industrial platform name used for the Le Creusot site at 72 rue Jean Jaurès, 71200 Le Creusot, where Jimmy assembles and builds thermal generators.
Products and services
- Jimmy Generator (thermal generator) High-temperature nuclear micro-reactor (HTR) based thermal generator that produces decarbonized industrial heat. Approximately 40m x 40m footprint with ~6,000 m² INB zone, delivers up to 500°C heat at 20 to 60 MW thermal power, 20-year lifespan, cooled by pressurized helium with graphite moderator; primary circuit helium, secondary circuit CO2 to the industrial heat network. For industrial heat consumers.
- Jimmy TRISO Fuel (TRISO particles in graphite compacts) Enriched uranium (LEU+ up to ~10-20%) packaged in TRISO particles (uranium core coated in carbon and ceramic layers, less than 1 mm diameter) embedded in graphite compacts (~2.5 cm high, ~1 cm diameter). Supports a 20-year generator life with a single refueling after 10 years. Sourced from Western suppliers; uranium enrichment contracted to Urenco. For Jimmy's own generators.
- Jimmy Industrial Platform (JimmyHub&Go) at Le Creusot 12-hectare industrial platform in the Creusot Montceau Urban Community (Espace Coriolis, 72 rue Jean Jaurès, 71200 Le Creusot) where Jimmy builds and assembles thermal generators that are deployed to client industrial sites. Hosts storage/assembly workshop (2025), fuel assembly workshop INB1 "Marie-Curie" (2026) and fuel preparation workshop (2028), with ~300 jobs planned.
- Turnkey Decarbonized Heat Offer (Heat-as-a-Service) 20-30 year heat purchase contract under which Jimmy designs, finances, installs, operates and decommissions the thermal generator on or near the client industrial site. Delivers process heat up to 500°C and ~45 bars, enables 90-95% CO2 emission reductions versus natural gas, and provides price stability over the contract duration. The full investment is funded by Jimmy. For industrial heat consumers.
Quantifiable outcome
- Up to 100,000 t CO2eq saved per generator per year over 20 years (vs natural gas)
- +4 more outcomes
Companies that use Jimmy
Customer profileNamed customers1 record
Segments2 records
Ideal customer profiles2 records
Jimmy technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature6 records
Jimmy partnerships and signals
Strategic signalPartnerships
Six partnerships are on record, tiered flagship, core and minor.
- Onet Technologies (Groupe Onet)flagshipStrategic partnership for the manufacturing of Jimmy's reactor vessel (cuve), a critical component. Onet Technologies is a French engineering, fabrication and services firm specialized in nuclear and defense (3,000 employees, 45+ years of experience). The partnership is described as a decisive step in the industrial concretization of Jimmy's project.
- UrencocoreUrenco supplies uranium enrichment services (low-enriched uranium plus, up to 10%) for Jimmy's first high-temperature gas-cooled micro-reactor using TRISO fuel, with a view to transitioning to HALEU when available. First delivery scheduled for 2026 from Urenco's USA site in Eunice, New Mexico. Jimmy's design is 20 MWth output thermal.
- Toyo TansocoreToyo Tanso supplies IG-110 isotropic nuclear-grade graphite, the moderator used in Jimmy's HTR micro-reactor. Contract secures the supply chain for the first generators and is described as initiating a long-term relationship; graphite will be manufactured in Japan and delivered to Jimmy's Le Creusot industrial platform.
- Photonis and ARCYScoreJimmy signed a cooperation agreement with Photonis and ARCYS during the World Nuclear Exhibition (WNE) to leverage their expertise in the design, fabrication and instrumentation of high-precision elements for Jimmy's micro-reactor.
- Cristal UnionflagshipFirst industrial customer of Jimmy; under evaluation for a Jimmy thermal generator (10 MW) to be deployed at the Cristanol site in Bazancourt (Marne). DAC filed by Jimmy with the French Ministry of Ecological Transition in April 2024. The Cristal Union Group aims to decarbonize its industrial processes.
- Sfen - Société française d'énergie nucléaireminorSfen invited Jimmy to host a webinar (Season 1, 2022; Season 2, October 2025) where Jimmy presented 3 years of project development, market figures, technical choices and licensing status. Replay hosted on YouTube; used as a thought-leadership platform.
Scale indicators8 records
Recent moves8 records
Expansion highlights6 records
Jimmy competitors and assessment
Company assessmentDirect peers
- Newcleo: France/UK-based developer of lead-cooled fast reactors (LFR) and a lead-cooled SMR targeting industrial decarbonization and electricity. Shares Jimmy's positioning as a private European SMR developer pursuing France 2030 funding and serving industrial customers with nuclear-based energy.
- Naarea: French deeptech startup developing a molten salt micro-nuclear reactor (MSFR) aimed at industrial heat and electricity decarbonization, with a comparable Heat-as-a-Service-type commercial model and French SMR regulatory positioning. Naarea is the closest French direct competitor to Jimmy in the industrial SMR space.
- Rolls-Royce SMR: UK-based consortium developing a 470 MWe pressurised water SMR, with potential industrial heat applications and Heat-as-a-Service-type commercial models. Comparable to Jimmy as a Western SMR developer pursuing industrial and utility customers with state-backed support.
- TerraPower: US-based advanced reactor developer (Natrium sodium-cooled fast reactor) backed by Bill Gates, with industrial decarbonization applications and a similar combination of private capital and government support. Comparable as a private advanced-reactor developer pursuing industrial energy customers.
- X-energy: US-based developer of the Xe-100 high-temperature gas-cooled reactor (HTGR) using TRISO fuel, the same fuel form as Jimmy. Xe-100 targets both industrial process heat applications and electricity, making X-energy the most direct international technical and commercial analogue to Jimmy's HTR/TRISO design.
- Oklo: US-based developer of compact fast microreactors (Aurora) targeted at industrial sites, data centers and remote power users. Similar to Jimmy in being a private microreactor company selling long-duration energy to industrial customers, though with a fast-spectrum rather than thermal HTR design.
- Last Energy: US/Europe-based microreactor developer offering a fully-integrated, factory-fabricated small modular reactor sold under long-term Power Purchase Agreements to industrial and district energy customers. Closely comparable to Jimmy on product (micro-nuclear reactor) and business model (long-term contract, customer-financed/owned, industrial heat focus).
- Kairos Power: US-based developer of the Kairos Power FHR (fluoride salt-cooled high-temperature reactor) using TRISO fuel, with explicit industrial process heat applications. Highly comparable to Jimmy in technology family (TRISO + high-temperature reactor), target market and Heat-as-a-Service-type deployment model.
- Stellaria: French startup developing a Generation IV molten salt reactor designed to provide decarbonized industrial heat. Closely comparable to Jimmy on geography, target use case (industrial process heat) and SMR technology category.
Emerging players
- Rondo Energy: US-based provider of industrial-scale thermal batteries that deliver zero-carbon process heat to industrial customers. Rondo competes with Jimmy for the same industrial heat decarbonization wallet but with a non-nuclear thermal storage solution, making it a relevant emerging substitute rather than a direct nuclear peer.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Jimmy social profiles
Digital presenceJimmy financial estimates
Financial estimateRevenue estimate
Valuation estimate
Jimmy leadership team
Management profileNumber of profiles
Profiles12 records
Jimmy funding detail
Funding detailFunding overview
Funding rounds4 records
Investors11 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Jimmy 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 Jimmy
What does Jimmy do?
Jimmy designs, builds, finances, owns, operates and decommissions compact high-temperature nuclear micro-reactor thermal generators (HTR, 20-60 MWth, up to 500°C) using TRISO fuel and helium coolant. The company delivers decarbonized industrial process heat to industrial sites under 20-30 year Heat-as-a-Service contracts, replacing natural gas burners and saving up to ~100,000 tonnes of CO2eq per year per generator.
Is Jimmy a public or private company?
Jimmy is a private company. It is classified as venture growth investor backed and is currently operating.
When was Jimmy founded?
Jimmy was founded in 2020. It employs 101 to 250 people.
Where is Jimmy based?
Jimmy is headquartered in Paris, France, in the Europe region.
How does Jimmy make money?
Three revenue lines are on record. Long-term heat purchase contracts (Heat-as-a-Service) is the primary driver. The others are public funding and grants (France 2030) and private equity and venture funding.
Who are Jimmy's main competitors?
Direct peers on record are Newcleo, Naarea, Rolls-Royce SMR, TerraPower, X-energy, Oklo, Last Energy, Kairos Power and Stellaria. Rondo Energy is listed as an emerging player.
Does Jimmy have an API?
No public API is recorded for Jimmy.
What industry is Jimmy in?
Jimmy's product category is Decarbonized Industrial Heat Services. Its primary akta.pro industry code is EUACAKAI, Industrial Process CHP (Refineries, Chemicals, Pulp & Paper, Metals), with a secondary code of EUABAJAI, Onsite Low-Carbon Heat & CHP (Electrified CHP, Fuel Cells, Renewable CHP). Its NAICS code is 332410 and its SIC code is 4991.