Xcimer Energy

Xcimer Energy is an inertial fusion energy company headquartered in Denver, Colorado, with manufacturing operations in Tucson, Arizona.

The company is building ultra high energy "superlasers" based on krypton fluoride (KrF) excimer technology to enable two main application areas:

• Commercial laser fusion power plants
• Directed energy and nuclear weapons effects testing for national security

Mission

Xcimer's mission is to commercialize laser fusion as a safe, affordable and effectively limitless energy source for the 21st century and beyond, while also improving air defense and national security.

What Xcimer does

• Develops high energy excimer laser systems and architectures
• Designs laser driven inertial fusion power plants (for example the planned Athena plant)
• Advances directed energy and nuclear effects testing capabilities for defense and stockpile stewardship applications
• Collaborates with national laboratories, universities, and industrial partners on fusion, laser technology, pulsed power, and nuclear engineering

Founders and leadership

• Founders: Conner Galloway (CEO, CSO) and Alexander Valys (CTO, President), MIT alumni with experience at Los Alamos National Laboratory and in early stage technology startups.
• Leadership team: includes executives and senior leaders across operations, engineering, chamber and plant design, target design, materials and process engineering, strategic development, talent, pulsed power, laser architecture, experimental science, optics, theory and computation, program leadership, strategic communications, and defense.

Team

• Xcimer employs more than 150 people, including engineers, scientists, technicians and business professionals.
• Expertise spans laser physics, fusion science, pulsed power, optics, materials science, high performance computing, manufacturing, and operations.

Key applications and customers

Xcimer's technologies are being developed to serve:

• Electric utilities and independent power producers seeking firm, carbon free baseload power
• Operators of energy intensive infrastructure such as AI training clusters, desalination plants, and industrial decarbonization projects
• Government and defense organizations that require advanced nuclear weapons effects testing, stockpile stewardship, and directed energy capabilities.

Investors

Xcimer has raised nearly $200 million across its seed and Series A funding rounds from leading climate and technology investors, including:

• Hedosophia
• Breakthrough Energy Ventures
• Lowercarbon Capital
• Prelude Ventures
• Emerson Collective
• Starlight Ventures
• Wireframe Ventures
• Leitmotif Ventures
• Gigascale Capital

This section is for background and investor related inquiries and does not constitute an offer to sell securities.

• Corporate headquarters: Denver, Colorado, USA

(exact street address is not listed here)

• Manufacturing operations: Tucson, Arizona, USA

Partner and collaborator sites

Xcimer collaborates with a network of national laboratories, universities, and industrial partners, including (non exhaustive):

• Los Alamos National Laboratory (Los Alamos, New Mexico)
• Lawrence Livermore National Laboratory (Livermore, California)
• Oak Ridge National Laboratory (Oak Ridge, Tennessee)
• Savannah River National Laboratory (Jackson, South Carolina)
• Naval Research Laboratory (Washington, DC)
• Laboratory for Laser Energetics (Rochester, New York)
• Massachusetts Institute of Technology (Cambridge, Massachusetts)
• General Atomics (San Diego, California)
• Westinghouse (Cranberry Township, Pennsylvania)
• Universidad Nacional de Educación a Distancia, UNED (Madrid, Spain)

These locations are primarily research and collaboration sites, not public visitor centers.

For directions or logistics related to specific visits, use the contact information document to coordinate directly with Xcimer.

Lists Savannah, Lawrence, Jackson, Oak Ridge, Humble, Mission, Cambridge, and Rochester as a location. Names Arizona, California, Colorado, Massachusetts, New Mexico, New York, Pennsylvania, and South Carolina as a service area. Areas beyond these are not published.

• General information: info@xcimer.energy

Use this address for general questions about Xcimer's technology, company information, and partnership inquiries that are not clearly media, careers, or investor related.

Media and press

• Media inquiries: media@xcimer.energy

Use this address for press requests, interviews, speaking engagements, and media related questions.

Careers and internships

• Careers and job applications: careers@xcimer.energy

Open roles are listed on the Careers page; submit applications through the careers portal where available, and use the email address above for additional questions.

Investors

• Investor relations: investors@xcimer.energy

Use this address for investor related inquiries. This document is informational only and does not constitute an offer to sell securities.

Accessibility feedback related to the website

For feedback about accessibility of the Xcimer website, including any barriers experienced when using assistive technologies, contact:

• Accessibility feedback: info@xcimer.energy

Include details about the page or feature where you encountered issues so the team can investigate.

Social channels (high level)

Xcimer maintains an online presence on platforms such as LinkedIn and YouTube for company news and updates. Refer to Xcimer's website for current official channel links.

Xcimer hires experts across:

• Fusion energy and plasma physics
• Laser and optical engineering
• Pulsed power and high voltage systems
• Aerospace and defense engineering
• Semiconductor manufacturing and lithography
• High performance computing and simulation
• Operations, manufacturing, and facilities
• Business roles such as HR, finance, government relations, and business development

Open positions are listed on Xcimer's Careers page. Inquiries can be sent to careers@xcimer.energy.

Many roles require that candidates be a U.S. citizen or national, U.S. permanent resident, or otherwise lawfully admitted into the U.S. under specific categories, due to regulatory and security requirements.

Culture and values

Xcimer describes its culture with four core values:

• Respectful Critique: Invite debate and require honesty, while never tolerating disrespect.
• Humble Ambition: Aim to do great things while recognizing the work of predecessors.
• Accountable Trust: Give team members real ownership and hold each other to commitments.
• Rigorous Urgency: Move quickly without compromising standards in a demanding technical field.

Benefits (high level)

For full time employees, Xcimer states that it offers:

• Competitive pay and equity compensation
• Comprehensive health, dental, and vision insurance
• Flexible Spending Accounts (FSAs)
• Short and long term disability coverage
• Life and AD&D insurance
• Employer matched 401(k)
• Up to 12 weeks of paid parental leave
• 13 paid company holidays
• Generous vacation and sick leave
• Relocation assistance for eligible roles
• Professional growth and development opportunities
• Dog friendly workplace
• Free lunch on certain days at main offices

Specific benefit details, eligibility, and compensation for any given role are determined in formal offer materials and HR documentation and are not set by this agent.

Internships

• Xcimer runs a competitive internship program where interns work alongside scientists and engineers on projects such as simulations, optical code development, hardware testing, and materials analysis.
• The company has a track record of converting many interns to full time roles after graduation or completion of their academic programs.
• More information and current internship postings are available on the Xcimer Internships page.

Major milestones

| Milestone | Target year | Location | Purpose | | --- | --- | --- | --- | | Phoenix | 2026 | Denver, CO | Demonstrate core excimer laser technology and laser architecture. Prototype high energy system validating key elements of Xcimer's low cost laser fusion architecture. | | Anvil | 2028 | Denver, CO | 200 kJ, two sided inertial fusion energy (IFE) excimer beamline demonstrator using Argos laser modules, the largest laser amplifiers in the world and first production units for a commercial laser fusion facility. | | Vulcan | 2031 | Site TBD | Engineering (wall plug) breakeven demonstration combining many Argos modules to deliver around 4 MJ of laser light on target and demonstrate net energy gain from laser fusion, with upgrade potential up to 12 MJ. | | Athena | 2035 | Site TBD | First commercial laser fusion power plant, targeting around 400 megawatts of electricity delivered to the grid. |

Timeline years and locations are targets and may evolve as programs progress and regulatory and siting processes advance.

Wall plug breakeven

• Scientific breakeven: When the fusion reaction releases more energy than the laser energy delivered to the target fuel capsule.
• Wall plug breakeven: When a complete fusion system (including lasers and all supporting equipment) produces more electrical power than it consumes from the grid to operate.

NIF has demonstrated scientific breakeven. Xcimer's Vulcan system is being designed to achieve wall plug breakeven.

Path to commercial power generation

Xcimer's path to commercial fusion power combines several economic and technical advantages:

• Large reductions in laser cost per joule compared with legacy laser systems.
• Larger, higher gain fuel capsules.
• Lower pulse repetition rates than many alternative fusion concepts.
• A self protecting liquid lithium salt fusion chamber that minimizes structural damage and maintenance.

Together these factors are intended to make laser fusion power plants cost competitive with fossil fuels and superior to intermittent renewables for firm, around the clock power.

Future specific commercial project locations, offtake agreements, and regulatory approvals are not published here and should not be inferred.

• Laser fusion, also called inertial confinement fusion (ICF) or inertial fusion energy (IFE), uses powerful laser beams to compress and ignite a small capsule of hydrogen isotopes.
• When the capsule is compressed to extreme densities and temperatures, the hydrogen isotopes fuse, releasing large amounts of energy.
• Laser driven inertial fusion is the only fusion approach that has achieved scientific breakeven in the laboratory, demonstrated at the National Ignition Facility (NIF) in December 2022.

What is a superlaser?

• A superlaser is an ultra high energy laser, far larger than typical commercial or industrial lasers.
• Historically, the largest lasers were one off systems at government laboratories.
• Xcimer is developing a commercial superlaser platform to power:
• Laser fusion power plants
• Directed energy and national security applications

Xcimer's three main system components

Xcimer's fusion architecture is built around three primary elements:

1. Excimer laser driver

• A krypton fluoride (KrF) excimer laser delivering more than 10 megajoules (MJ) of energy.

2. Fusion fuel capsule

• A deuterium tritium (DT) fuel capsule that is larger and more robust than previous designs, but uses the same fusion physics demonstrated at NIF.

3. HYLIFE III fusion chamber

• A chamber that uses a flowing liquid lithium salt to absorb fusion energy and protect structural components from neutron damage, reducing maintenance and minimizing long lived waste.

Why excimer lasers?

• Xcimer uses electron beam pumped krypton fluoride (KrF) excimer lasers.
• Excimer lasers have been used at scale in semiconductor lithography and other industrial and medical applications for decades.
• Compared with traditional solid state glass lasers, Xcimer's excimer architecture offers:
• Much higher output energy potential
• Greater scalability and industrialization potential
• Significantly lower cost per joule of laser energy compared with NIF scale glass lasers

Safety and fuel

• Each fusion shot uses a capsule containing only a few milligrams of deuterium and tritium fuel.
• Only one capsule is in the fusion chamber at any given time.
• The fusion burn lasts only a few billionths of a second and requires precisely controlled conditions, so there is no possibility of a runaway or chain reaction.
• Fuel is derived from:
• Deuterium: extracted from seawater
• Tritium: bred from lithium in the fusion chamber
• Together, these resources are effectively abundant enough for millions of years of energy supply.

Benefits of Xcimer's approach

Key advantages of Xcimer's laser fusion architecture include:

• The laser fusion physics pathway has already achieved scientific breakeven in government laboratories.
• A gas excimer laser architecture that can reduce cost per joule of laser energy by more than an order of magnitude compared with existing large glass lasers.
• Larger, higher gain fuel capsules and lower repetition rates to simplify plant operations.
• A self protecting liquid lithium salt chamber that mitigates materials challenges and maintenance frequency.

Defense and national security applications

In addition to energy, Xcimer's lasers are being developed for:

• Nuclear weapons effects testing (NWET) and stockpile stewardship
• High energy density physics experiments
• Directed energy research and related defense applications

Specific defense programs, customers, and classified details are not published here.

Xcimer Energy states that it is committed to making its website accessible and usable for all visitors, including people with disabilities.

The company aims to design and maintain its website in line with widely recognized accessibility standards such as the Web Content Accessibility Guidelines (WCAG) 2.1 Level AA, and continues to improve the accessibility and usability of its digital content.

Key areas of focus

Areas of ongoing accessibility work include:

• Providing text alternatives for non text content
• Ensuring content is adaptable and distinguishable
• Supporting keyboard navigation
• Allowing sufficient time to read and interact with content
• Avoiding content that could cause seizures or physical reactions
• Offering clear navigation and orientation aids
• Making text readable and understandable
• Ensuring web pages behave in predictable ways
• Helping users avoid and correct input errors
• Maximizing compatibility with assistive technologies and modern browsers

Known limitations and continuous improvement

The accessibility statement notes that some content or features may not yet fully meet accessibility standards. Xcimer treats accessibility as an ongoing process and works to identify and address barriers over time.

Providing feedback

Visitors who encounter accessibility barriers or have suggestions for improvement are encouraged to email info@xcimer.energy and include details about the page or feature where they experienced difficulty.

Xcimer states that it will make reasonable efforts to respond to feedback and resolve reported issues as quickly as possible.

Ask anyway — the agent will say plainly that it is not published rather than guess.