Top Energy companies
Ranked by total raised · 25 of 49 on the roster · Updated Oct 27, 2026
Together these 25 have raised $30.7B. Commonwealth Fusion Systems leads with $6.9B, followed by Crusoe ($2.5B) and Base Power ($2.3B).
- #01
Commonwealth Fusion SystemsCommonwealth Fusion Systems designs and builds compact fusion reactors using high-temperature superconducting magnets. The company develops demonstration and commercial fusion power plants for grid-scale electricity generation.
Fusion EnergySeries C$4BHQ - #02
CrusoeCrusoe converts stranded and flared natural gas into electricity for data centers and high-performance computing.
Data Center Energy · Series E $1.4B
Data Center EnergySeries E$1.4BHQ - #03
Base PowerBase Power installs whole-home batteries and provides retail electricity supply to residential customers, enabling grid-scale storage through distributed hardware and a subscription model.
Distributed Solar & Storage · Series D $1BDistributed Solar & StorageSeries D$1BHQ
- #04
Redwood MaterialsRedwood Materials recycles lithium-ion batteries and manufactures anode and cathode components from recycled materials.
Battery Recycling & Supply ChainSeries D$1BHQ - #05
Form EnergyForm Energy manufactures iron-air battery systems for grid-scale long-duration energy storage, using reversible oxidation chemistry to store electricity for 100+ hours without lithium or cobalt.
Long-Duration StorageSeries G$750MHQ - #06
TerraPowerTerraPower builds sodium-cooled fast reactors and molten-chloride fast reactors for clean baseload power.
Advanced Nuclear FissionGrowth$650MHQ - #07
Sila NanotechnologiesSila Nanotechnologies produces silicon-dominant anode materials for lithium-ion batteries to increase energy density.
Battery TechnologySeries G$375MHQ - #08
TAE TechnologiesTAE Technologies pursues aneutronic fusion using a field-reversed configuration and proton-boron fuel.
Fusion EnergyGrowth$150MHQ - #09
Group14 TechnologiesGroup14 Technologies produces silicon-carbon composite anode materials for lithium-ion batteries with higher energy density.
Battery TechnologySeries D$463MHQ - #10
Fervo EnergyFervo Energy develops enhanced geothermal systems (EGS) using horizontal drilling and fiber-optic sensing to deliver firm, 24/7 baseload renewable power at utility scale.
Geothermal & Baseload RenewablesSeries F$180MHQ - #11
X-energyX-energy develops high-temperature gas-cooled pebble-bed reactors and TRISO fuel for advanced nuclear plants.
Advanced Nuclear FissionIPO$1.0BHQ - #12
Fluence EnergyFluence Energy delivers utility-scale battery energy storage systems and software for grid operators globally.
Grid-Scale StorageIPO$998.2MHQ - #13
Helion EnergyHelion builds pulsed non-ignition fusion systems using field-reversed configuration and direct electricity conversion.
Fusion EnergySeries F$425MHQ - #14
Pacific FusionPacific Fusion develops pulsed-power driven inertial confinement fusion for commercial energy production.
Fusion EnergySeries A$900MHQ - #15
Antora EnergyAntora Energy develops modular thermal battery systems that store renewable electricity as heat in solid carbon blocks at up to 2,400°C, then dispatch heat and power to heavy-industrial processes.
Thermal StorageGrowth$550MHQ - #16
Mainspring EnergyMainspring Energy builds linear generator systems that convert natural gas and renewable fuels into electricity with low emissions.
Distributed GenerationSeries F$258MHQ - #17
Electric HydrogenElectric Hydrogen manufactures high-efficiency modular electrolyzers for green hydrogen production at industrial scale.
Green HydrogenDebt$100MHQ - #18
NextrackerNextpower (formerly Nextracker) produces intelligent solar trackers and integrated power technology for utility-scale solar farms worldwide.
Solar Balance-of-SystemIPO$693.8MHQ - #19
Stem Inc.Stem delivers AI-driven energy storage software and virtual power plant services for commercial and industrial customers.
Grid Software & VPPsIPO$608MHQ - #20
Cypress Creek RenewablesCypress Creek Renewables develops, owns, and operates utility-scale solar and storage projects across the US.
Utility-Scale RenewablesAcquired—HQ - #21
Lunar EnergyLunar Energy designs integrated home battery and energy management systems for solar-plus-storage installations.
Distributed Solar & Storage · Series D $232MDistributed Solar & StorageSeries D$232MHQ - #22
Kairos PowerKairos Power designs and develops advanced fission reactors using pebble-bed TRISO fuel and molten salt cooling for power generation and industrial heat applications.
Advanced Nuclear FissionGrowth$100MHQ - #23
NuScale PowerNuScale designs and commercializes light-water small modular reactors with NRC-certified technology.
Small Modular ReactorsIPO$380MHQ - #24
Zap EnergyZap Energy pursues sheared-flow-stabilized Z-pinch fusion without magnets or lasers for compact reactors.
Fusion EnergySeries D$130MHQ - #25
OkloOklo develops fast-neutron microreactors designed to use recycled nuclear fuel and deliver distributed power.
Small Modular ReactorsIPO$306MHQ