Xcimer Energy Funding, Investors & Competitors

Xcimer Energy has raised $109M across 3 funding rounds, most recently a undisclosed-stage round in September 2026.

Last Xcimer Energy funding round

Undisclosed stage

Amount undisclosed · Sep 2026

Cumulative funding Xcimer Energy raised

$109M

across 3 funding rounds

Key investors in Xcimer Energy

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

Xcimer Energy Overview

About Xcimer Energy

Xcimer Energy is a Redwood City-headquartered inertial fusion company founded in 2021. It develops laser-driven fusion power plants combining excimer laser technology with HYLIFE reaction chambers to deliver affordable, carbon-free energy at scale.


Founded

2021

HQ

United StatesDenver, CO

Website

xcimer.net

Status

Privately held

Customer focus

B2B

Revenue model

Product sales

Xcimer Energy Funding History

Xcimer Energy has raised a total of $109M across 3 funding rounds.

Xcimer Energy's first fundraising round was a $9M Series A in December 2022. The most recent completed round was a undisclosed-stage round in September 2026.

Xcimer Energy funding rounds

Xcimer Energy funding rounds
DateStageInvestorsRaisedDeal Summary
Sep 2026Undisclosed stageRTX Ventures (lead)-RTX Ventures, the venture capital arm of RTX, made a minority investment in Xcimer Energy Corporation in September 2026 as part of a late-stage financing round. The transaction was paired with a teaming agreement under which RTX and Xcimer agreed to explore integrating Xcimer’s multi-kilojoule-class pulsed-laser technology into RTX defense systems for potential directed-energy applications against airborne threats. The investment was structured as a strategic corporate venture stake rather than an acquisition, aligning Xcimer’s fusion-energy laser platform with RTX’s defense and directed-energy roadmap. The deal was described as supporting Xcimer’s development of scalable pulsed-laser technology and reinforcing its laser-fusion energy program, which had been approved earlier in 2026 under the U.S. Department of Energy’s milestone-based fusion development program. Xcimer Energy Corporation is a Denver-based laser-fusion company building high-power lasers for commercial fusion energy and defense-adjacent directed-energy use. The company has previously raised funding from investors including Hedosophia and Breakthrough Energy Ventures and has said it is developing the world’s largest, brightest, and most powerful lasers for fusion and air defense applications.
Jun 2024Series AHedosophia (lead); Gigascale Capital; Emerson Collective; Breakthrough Energy Ventures; Starlight Ventures; Prelude Ventures; Lowercarbon Capital; Leitmotif$100MXcimer Energy, a Denver-based company founded in 2022, develops laser-driven inertial confinement fusion technology aimed at commercializing low-cost, high-energy inertial fusion energy. The company announced a $100 million Series A funding round on June 4, 2024, led by Hedosophia, with participation from Breakthrough Energy Ventures, Emerson Collective, Gigascale Capital, Lowercarbon Capital, Prelude Ventures, and Starlight Ventures. The funding will support the establishment of a new facility in Denver to build a prototype laser system, including the world’s largest nonlinear optical pulse compression system, to demonstrate the viability of Xcimer’s approach, which claims up to 10 times higher laser energy, 10 times higher efficiency, and over 30 times lower cost per joule compared to existing systems. Xcimer also plans to expand its technical team, having hired Giovanni Greco as senior vice president of engineering with experience from Blue Origin and Astra Space. Prior to this round, the company had raised grants including $9 million from the U.S. Department of Energy’s Milestone-Based Fusion Development Program, bringing total funding to nearly $118 million. Xcimer’s technology draws on laser research from the 1980s Strategic Defense Initiative and builds on net energy gain achievements at Lawrence Livermore National Laboratory, focusing on laser inertial confinement fusion as an alternative to magnetic approaches. The company operates in a competitive fusion sector where nearly three dozen firms have raised over $6.2 billion, positioning Xcimer to achieve key milestones toward safe, reliable, zero-carbon energy.
Dec 2022Series AStarlight Ventures$9MXcimer Energy is a Denver-based nuclear fusion startup founded in 2022 by engineers Conner Galloway and Alexander Valys, focused on developing laser-driven inertial fusion technology to generate clean, carbon-free power. The company's core technology combines breakthrough laser systems with proven fusion science to create a low-cost, high-energy approach to commercialize fusion energy for the electrical grid. The search results document Xcimer's Series A funding round in June 2024, where the company raised $100 million led by Hedosophia with participation from Breakthrough Energy Ventures, Lowercarbon Capital, Prelude Ventures, Emerson Collective, Gigascale Capital, and Starlight Ventures. The Series A proceeds were allocated to establishing a new facility in Denver to build a prototype laser system, including what the company describes as the world's largest nonlinear optical pulse compression system. Prior to the Series A, Xcimer had raised a seed round and received $9 million in grant funding from the U.S. Department of Energy's Milestone-Based Fusion Development Program, signaling government backing for the company's technology roadmap.

Who has invested in Xcimer Energy?

9 investors have backed Xcimer Energy across its funding rounds, including Starlight Ventures, Breakthrough Energy Ventures, Lowercarbon Capital, Hedosophia, Prelude Ventures and Emerson Collective.

Lead investors include RTX Ventures and Hedosophia.


Xcimer Energy Investors

Investors in Xcimer Energy by funding rounds participated
InvestorHQRoundsRoleFirst check
Starlight VenturesUnited StatesMiami, FL2ParticipantDec 2022
Gigascale CapitalUnited StatesSan Francisco, CA1ParticipantJun 2024
Emerson CollectiveUnited StatesSan Francisco, CA1ParticipantJun 2024
Breakthrough Energy VenturesFranceParis1ParticipantJun 2024
RTX VenturesUnited StatesWashington, DC1LeadSep 2026
Prelude VenturesUnited StatesSan Francisco, CA1ParticipantJun 2024
Lowercarbon CapitalUnited StatesJackson, MS1ParticipantJun 2024

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Benchmark 350K+ Funding Rounds and Disclosed VC Valuation Multiples

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Xcimer Energy Competitors

Xcimer Energy competitors include listed companies like Iberdrola, China Yangtze Power, Constellation Energy and Vistra, and private ones like Adani New Industries and Helion Energy.

Public and private companies comparable to Xcimer Energy
CompanyHQStatusRevenueEBITDAValuationRevenue Multiple
IberdrolaSpainSpainPublicly listed$51B$17B$158B4.3x
China Yangtze PowerChinaChinaPublicly listed$13B$11B$104B11.3x
Constellation EnergyUnited StatesUnited StatesPublicly listed$26B$5B$93B3.8x
Adani New IndustriesIndiaAhmedabadPrivate--$50B-
VistraUnited StatesUnited StatesPublicly listed$18B$5B$48B3.3x
Helion EnergyUnited StatesSeattle, WAPrivate--$16B-

Xcimer Energy Public Comps

Xcimer Energy is still privately-owned, but its public comps include Aramco, ExxonMobil, Chevron, PetroChina, Shell, GE Vernova, TotalEnergies, NextEra Energy, ConocoPhillips and Iberdrola.

Last FYEV/RevenueEV/EBITDA
RevenueEBITDALast FYLTM2027ELast FYLTM2027E
Aramco$446B$213B3.9x3.7x8.2x7.1x
ExxonMobil$324B$68B2.2x1.8x10.5x8.0x
Chevron$184B$41B2.4x2.0x10.8x7.2x
PetroChina$427B$70B0.8x0.7x4.7x4.4x
Shell$267B$55B1.2x1.0x5.8x4.5x
GE Vernova$38B$3.2B6.2x5.4x73.5x43.5x
TotalEnergies$182B$38B1.3x1.2x6.3x5.0x
NextEra Energy$27B$16B10.5x9.6x17.9x16.2x

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Common questions about Xcimer Energy

When was Xcimer Energy founded?Xcimer Energy was founded in 2021.
Where is Xcimer Energy headquartered?Xcimer Energy is headquartered in Denver, CO, United States.
Is Xcimer Energy publicly listed?No, Xcimer Energy is a private, VC-backed company.
How much funding has Xcimer Energy raised?Xcimer Energy has raised $109M across 3 funding rounds.
What was Xcimer Energy's last funding round?Xcimer Energy's last funding round was a undisclosed-stage round in September 2026, led by RTX Ventures.
Who are Xcimer Energy's investors?Xcimer Energy's investors include Starlight Ventures, Gigascale Capital, Emerson Collective, Breakthrough Energy Ventures, RTX Ventures, Prelude Ventures, Lowercarbon Capital, Hedosophia and Leitmotif.
Which companies are comparable to Xcimer Energy?Companies comparable to Xcimer Energy include Iberdrola, China Yangtze Power, Constellation Energy, Adani New Industries, Vistra and Helion Energy.

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