Sector portfolio · VC firm · United States

Breakthrough Energy's Energy portfolio

Breakthrough Energy has backed 25 Energy startups in rounds we track, $3.8B between them, shown by the stage each has reached. The best-funded is Form Energy.

25startups backed
5stages
$3.8Braised between them
Stage not reportedbiggest stage

Breakthrough Energy's whole portfolioBreakthrough Energy's profile

Stage not reported

10

Series C and later

5

Series A

4

Series B

3

Pre-seed and seed

3

Segment by segment

Stage not reported

10 startups · $374M raised

  1. Mangrove LithiumDevelops a platform for the most cost-effective production of battery grade lithium hydroxide from diverse input streams and assets.Canada$101M
  2. Xcimer EnergyXcimer Energy is an inertial fusion company offering laser-driven fusion to provide cheap, abundant, and carbon-free energy.United States$100M
  3. Rondo EnergyRondo Heat Battery powers industrial processes with renewable electricity, cutting energy costs and eliminating emissions.United States$80M
  4. MMaltaUnited States$50M
  5. Natel EnergyNatel Energy is a supplier of sustainable hydropower solutions that produce reliable renewable energy.United States$15M
  6. Quidnet EnergyQuidnet Energy is an energy storage company based in Houston, Texas, focused on developing Geomechanical Energy Storage (GES) technology.United States$10M
  7. CZeroFrictionless, carbon-neutral distribution for food and technology businesses.United States$5.5M
  8. SparkMeterSparkMeter is a technology company founded in 2013 and based in Washington, D.C., with significant operations in Nairobi, Kenya.United States$5.0M

Series C and later

5 startups · $2.8B raised

  1. Form EnergyForm Energy develops and commercializes a low-cost battery system that can store wind and solar energy for a long duration.United States$2.0B
  2. Antora EnergyAntora Energy is an American energy technology company founded in 2018, focused on developing modular thermal batteries that proviUnited States$565M
  3. VEIRVEIR is a technology company founded in 2019, based in Woburn, Massachusetts.United States$185M
  4. EESSUnited States$58M
  5. Blue World TechnologiesBlue World Technologies is a developer and manufacturer of high-efficiency methanol fuel cell components and systems.Denmark$12M

Series A

4 startups · $160M raised

  1. FleetzeroFleetzero is building battery electric cargo ships to affordably decarbonize ocean freight.United States$43M
  2. RedoxBloxRedoxBlox is a post-Series A startup based in San Diego, California, focused on transforming the energy sector with its innovativeUnited States$40M
  3. Fourth PowerFourth Power is an innovative energy technology company based in Cambridge, Massachusetts.United States$39M
  4. Mantle8Mantle8 is a European clean energy startup based in Grenoble, France, founded in 2024 by Emmanuel Masini.France$38M

Series B

3 startups · $409M raised

  1. Heron PowerHeron Power is an energy infrastructure company based in Scotts Valley, California, founded in 2024 by Drew Baglino, a former TeslUnited States$238M
  2. KolomaKoloma is a geologic hydrogen company that leverages technology and data to identify and commercialize geologic hydrogen resources.United States$111M
  3. TS ConductorTS Conductor, based in Huntington Beach, California, is a manufacturer of advanced electric power lines aimed at modernizing the gUnited States$60M

Pre-seed and seed

3 startups · $50M raised

  1. BarocalBarocal is a Cambridge University spin-out founded in 2019, focused on developing solid-state cooling and heating technologies.United Kingdom$23M
  2. Still BrightStill Bright is a Newark, New Jersey-based private company founded in 2022.United States$19M
  3. AirLoom EnergyAirLoom Energy offers wind energy harvesting services.United States$7.5M

How this map is made. Every startup here works in Energy and has raised money in a round we track that names Breakthrough Energy as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026.

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