Capital

Every kind of money moving into US energy technology. Public money: what's open to apply for and what the federal government has paid out. Private and project capital: what investors have put into companies and what's financing specific projects.

Private fundraises reported to the SEC on Form D.

TechnologyMoneyYearSort

Total shown

$10B

153 entries

By year

Cambridge Heavy Industries · Private raiseFusionPrivate investors (SEC Form D) — D filed 2026-10-07$7.2M2026-09+ THESIS
Blue Laser Fusion · Private raiseFusionPrivate investors (SEC Form D) — D/A filed 2026-10-22$34M2026-09+ THESIS
Bluecore Energy · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-09-04$19M2026-08+ THESIS
Horne Technologies · Private raiseFusionPrivate investors (SEC Form D) — D filed 2026-08-25$500K2026-08+ THESIS
Antares Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-08-18$60M2026-08+ THESIS
Antora Energy · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2026-08-04$458M2026-07+ THESIS
Antares Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-07-28$320M2026-07+ THESIS
EnerVenue · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2026-06-09$340M2026-05+ THESIS
Terrestrial Energy · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-03-31$85K2026-03+ THESIS
Bluecore Energy · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-04-06$9.3M2026-02+ THESIS
Utility Global · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2026-05-29$100M2026-02+ THESIS
Heron Power · Private raiseTransmission & equipmentPrivate investors (SEC Form D) — D filed 2026-02-20$138M2026-02+ THESIS
Deep Fission · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-02-18$80M2026-02+ THESIS
Standard Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-02-09$46M2026-01+ THESIS
Span · Private raiseDistributed storage & VPPsPrivate investors (SEC Form D) — D filed 2026-01-27$163M2026-01+ THESIS
Horne Technologies · Private raiseFusionPrivate investors (SEC Form D) — D filed 2026-02-18$500K2026-01+ THESIS
Malta · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2026-01-14$24M2025-12+ THESIS
Avalanche Energy · Private raiseFusionPrivate investors (SEC Form D) — D/A filed 2026-01-29$29M2025-12+ THESIS
Radiant · Private raiseFissionPrivate investors (SEC Form D) — D filed 2025-12-30$269M2025-12+ THESIS
Ecolectro · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2025-11-07$2.3M2025-10+ THESIS
Span · Private raiseDistributed storage & VPPsPrivate investors (SEC Form D) — D filed 2025-09-26$25M2025-09+ THESIS
Antares Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2025-09-19$51M2025-09+ THESIS
Standard Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-02-09$70M2025-08+ THESIS
Antora Energy · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2025-11-03$72M2025-07+ THESIS
ESS Tech · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2025-07-23$900K2025-07+ THESIS
Heron Power · Private raiseTransmission & equipmentPrivate investors (SEC Form D) — D filed 2025-05-28$43M2025-05+ THESIS
Realta Fusion · Private raiseFusionPrivate investors (SEC Form D) — D filed 2025-05-13$36M2025-05+ THESIS
Radiant · Private raiseFissionPrivate investors (SEC Form D) — D filed 2025-06-10$66M2025-02+ THESIS
Standard Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2026-02-09$43M2025-02+ THESIS
Amogy · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2024-12-05$11M2024-11+ THESIS
Radiant · Private raiseFissionPrivate investors (SEC Form D) — D filed 2024-11-15$100M2024-10+ THESIS
Antares Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2024-10-09$28M2024-09+ THESIS
Acceleron Fusion · Private raiseFusionPrivate investors (SEC Form D) — D filed 2024-09-27$15M2024-09+ THESIS
Koloma · Private raiseHydrogenPrivate investors (SEC Form D) — D/A filed 2026-10-19$61M2024-08+ THESIS
Zap Energy · Private raiseFusionPrivate investors (SEC Form D) — D filed 2024-07-31$130M2024-07+ THESIS
Hexium · Private raiseFusionPrivate investors (SEC Form D) — D filed 2024-07-24$8.0M2024-07+ THESIS
Electrified Thermal Solutions · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2025-02-13$19M2024-05+ THESIS
Utility Global · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2024-05-24$48M2024-05+ THESIS
NANO Nuclear Energy · Private raiseFissionPrivate investors (SEC Form D) — D filed 2024-01-23$2.2M2024-01+ THESIS
Koloma · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2024-02-09$246M2023-12+ THESIS
Elementl Power · Private raiseFissionPrivate investors (SEC Form D) — D filed 2024-05-02$5.0M2023-12+ THESIS
Malta · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2023-12-01$22M2023-11+ THESIS
Ecolectro · Private raiseHydrogenPrivate investors (SEC Form D) — D/A filed 2024-08-15$11M2023-11+ THESIS
Antares Nuclear · Private raiseFissionPrivate investors (SEC Form D) — D filed 2023-10-30$8.1M2023-10+ THESIS
EnerVenue · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2024-06-05$308M2023-10+ THESIS
ESS Tech · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2023-09-26$28M2023-09+ THESIS
Advanced Ionics · Private raiseHydrogenPrivate investors (SEC Form D) — D/A filed 2024-11-12$17M2023-07+ THESIS
NANO Nuclear Energy · Private raiseFissionPrivate investors (SEC Form D) — D filed 2023-06-08$1.9M2023-06+ THESIS
Koloma · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2023-06-08$30M2023-05+ THESIS
Talen Energy · Private raiseFissionPrivate investors (SEC Form D) — D filed 2023-05-26$1.4B2023-05+ THESIS
Realta Fusion · Private raiseFusionPrivate investors (SEC Form D) — D filed 2023-05-26$9.0M2023-05+ THESIS
Advanced Ionics · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2023-05-25$525K2023-05+ THESIS
Verdagy · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2023-08-21$29M2023-04+ THESIS
Electric Hydrogen · Private raiseHydrogenPrivate investors (SEC Form D) — D filed 2023-10-23$381M2023-04+ THESIS
Radiant · Private raiseFissionPrivate investors (SEC Form D) — D filed 2023-04-18$41M2023-04+ THESIS
Controlled Thermal Resources · Private raiseGeothermalPrivate investors (SEC Form D) — D/A filed 2023-12-29$13M2023-03+ THESIS
Span · Private raiseDistributed storage & VPPsPrivate investors (SEC Form D) — D filed 2023-03-03$84M2023-02+ THESIS
NANO Nuclear Energy · Private raiseFissionPrivate investors (SEC Form D) — D filed 2023-02-16$3.7M2023-02+ THESIS
Eos Energy · Private raiseLong-duration storagePrivate investors (SEC Form D) — D filed 2023-02-02$14M2023-01+ THESIS
Marathon Fusion · Private raiseFusionPrivate investors (SEC Form D) — D filed 2024-02-05$5.0M2022-12+ THESIS

Sorted by date, newest first. Amount sold so far in each offering, from the latest Form D or amendment. Not every round is reported on Form D.

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Funding sources tracked (53)

53 sources

DOE - Office of Energy Efficiency and Renewable Energy (EERE) & Tech Offices
Federal
Applied R&D across solar, wind, hydrogen/fuel cells, vehicles, buildings, advanced manufacturing, geothermal, hydropower, etc.
Programs
Technology-specific FOAs/NOFOs; often cost-shared
Stage
TRL 2–6 (applied R&D to early demo)
Feed
Grants.gov API
Website
energy.gov (search funding opportunities)
DOE - Advanced Research Projects Agency-Energy (ARPA-E)
Federal
High-risk, high-impact energy technologies too early for private investment (fusion, storage, grid, hydrogen, materials, etc.)
Programs
Focused programs and OPEN solicitations; SCALEUP; SBIR/STTR topics
Stage
TRL 2–6 (transformational R&D to early prototype)
Feed
Grants.gov APIadded to your list
Website
arpa-e.energy.gov
DOE - Office of Science (SC)
Federal
Basic/foundational energy research (materials, chemistry, fusion, biological systems, etc.)
Programs
Early Career Research Program; Energy Frontier Research Centers; Open Call; EPSCoR
Stage
TRL 1–3 (basic research)
Feed
Grants.gov API
Website
science.osti.gov
DOE - Office of Fossil Energy and Carbon Management (FECM)
Federal
Carbon management, fossil energy tech improvements, related early R&D
Programs
Competitive FOAs for early-stage projects
Stage
TRL 2–6
Feed
Grants.gov API
Website
energy.gov/fecm
DOE - Office of Nuclear Energy (NE)
Federal
Advanced nuclear reactor concepts, fuels, materials, and related R&D
Programs
FOAs and SBIR topics on nuclear energy
Stage
TRL 2–6
Feed
Grants.gov API
Website
energy.gov/ne
DOE - Office of Electricity (OE)
Federal
Grid technologies, reliability, resilience, controls, and related early-stage work
Programs
FOAs focused on grid innovation
Stage
TRL 2–6
Feed
Grants.gov API
Website
energy.gov/oe
DOE - Office of Technology Transitions (OTT)
Federal
Commercialization of DOE/lab technologies; early-stage entrepreneur support
Programs
Technology Commercialization Fund (TCF); Lab-Embedded Entrepreneurship Program (LEEP); vouchers; CRADAs
Stage
TRL 3–6 (lab-to-market)
Feed
Page monitor
Website
energy.gov/technologytransitions
DOE - Office of Critical Minerals and Energy Innovation (CMEI) & related offices
Federal
Critical minerals/materials, advanced manufacturing, alternative fuels/feedstocks, integrated systems
Programs
FOAs for early R&D and scale-up support
Stage
TRL 2–6
Feed
Grants.gov API
Website
energy.gov (CMEI / related)
DOE SBIR/STTR Program
Federal
Broad energy R&D topics from multiple DOE offices (production, efficiency, grid, nuclear, materials, etc.)
Programs
Phase I (~$200–250K); Phase II (~$1.1–1.6M); two cycles/year historically
Stage
TRL 2–5 (feasibility to prototype)
Feed
SBIR.gov API
Website
science.osti.gov/sbir or sbir.gov
National Science Foundation (NSF)
Federal
Fundamental energy research + broad commercialization of energy technologies
Programs
Research grants; SBIR/STTR (America’s Seed Fund) with open energy topics
Stage
TRL 1–4 (basic to early applied)
Feed
Grants.gov API
Website
nsf.gov (Energy Technology focus area)
Department of Defense (DOD) SBIR/STTR
Federal
Energy resilience, microgrids, field/portable power, dual-use energy technologies
Programs
Service-specific topics (Army, Navy, Air Force, DARPA, etc.); variable award sizes
Stage
TRL 2–6 (dual-use)
Feed
DoD SBIR topics
Website
dodsbirsttr.mil or sbir.gov
Department of Agriculture (USDA)
Federal
Bioenergy, advanced biofuels, biomass, rural energy systems
Programs
SBIR/STTR + other bioenergy R&D programs
Stage
TRL 2–5
Feed
Grants.gov API
Website
usda.gov or sbir.gov
Environmental Protection Agency (EPA)
Federal
Energy-related environmental technologies (air, water, waste/circular economy, remediation)
Programs
SBIR program
Stage
TRL 2–5
Feed
SBIR.gov API
Website
epa.gov/sbir
NASA (limited energy topics)
Federal
Energy technologies with space or dual-use applications
Programs
SBIR topics occasionally relevant to energy
Stage
TRL 2–5
Feed
SBIR.gov API
Website
nasa.gov/sbir
California Energy Commission (CEC)
State
Electricity-sector innovation, clean energy R&D, demos, and early-stage entrepreneurship
Programs
EPIC (~$130M+/yr); CalSEED (very early concept/prototype grants); BRIDGE; fusion initiative
Stage
TRL 2–7 (concept to demo)
Feed
CA Grants Portal dataset
Website
energy.ca.gov
Washington State Dept. of Commerce (Clean Energy Fund)
State
Innovative clean energy technologies aligned with state climate goals
Programs
RD&D Program grants (e.g., ~$10M rounds for TRL 4–7 in storage, bioenergy, carbon, grid)
Stage
TRL 4–7
Feed
Page monitor
Website
commerce.wa.gov
Connecticut Innovations (CI)
State
Climate tech and clean energy startups (pre-seed through growth)
Programs
Pre-Seed Financing; ClimateTech Fund ($100M equity/investments)
Stage
TRL 2–6 (pre-seed to Series B)
Feed
Reference only
Website
ctinnovations.com
Connecticut Green Bank
State
Clean energy financing and ecosystem support (leans more toward deployment but supports innovation)
Programs
Financing programs, open RFPs, ratepayer-funded clean energy investments
Stage
TRL 5–9 (more deployment-focused)
Feed
Page monitor
Website
ctgreenbank.com
Colorado Energy Office / related funds
State
Innovative energy solutions, efficiency, and clean tech advancement
Programs
State energy programs and related innovation support
Stage
Varies (planning to demo)
Feed
Page monitor
Website
energyoffice.colorado.gov
Illinois (DCEO and related)
State
Clean energy innovation and SBIR matching support
Programs
SBIR Phase I match (up to ~$100K) and related state programs
Stage
TRL 2–5 (supplements federal)
Feed
Page monitor
Website
dceo.illinois.gov
Hawaii State Energy Office
State
Clean energy technology proving ground and innovation acceleration
Programs
State energy programs supporting tech demonstration and adoption
Stage
TRL 4–7
Feed
Page monitor
Website
energy.hawaii.gov
Other State Energy Offices (e.g., North Dakota, Ohio, Maryland, etc.)
State
Varies widely: limited R&D, demos, or formula-funded innovation/planning
Programs
State Energy Program (SEP) formula funds; some dedicated R&D appropriations (e.g., ND energy R&D, OH nuclear/coal)
Stage
Mostly planning/demo; limited pure early R&D
Feed
Reference only
Website
See DOE State Energy Offices list
Texas Energy Fund (PUC of Texas) (TX)
State
Dispatchable generation loans
Programs
Texas Energy Fund loans and completion bonuses
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.texasenergyfund.com
Texas Advanced Nuclear Energy Office (Governor's Office) (TX)
State
Advanced nuclear grants (HB 14)
Programs
Texas Advanced Nuclear Development Fund
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
gov.texas.gov/taneo/page/tandf
TCEQ (TX)
State
Clean transport, hydrogen infrastructure
Programs
Texas Emissions Reduction Plan (TERP)
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.tceq.texas.gov/airquality/terp
Utah Office of Energy Development (UT)
State
Nuclear consortium, geothermal, incentives
Programs
Energy programs and incentives
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
energy.utah.gov
Utah Governor's Office of Economic Opportunity (UT)
State
Post-performance tax credits
Programs
Economic Development Tax Increment Financing (EDTIF)
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
business.utah.gov/recruitment/
Nevada Governor's Office of Energy (NV)
State
Clean energy grants
Programs
Energy programs and incentives
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
energy.nv.gov
Nevada GOED (NV)
State
Renewable energy abatements
Programs
Tax abatements for renewable energy
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
goed.nv.gov/programs-incentives/
CPUC (CA)
State
Storage incentives
Programs
Self-Generation Incentive Program (SGIP)
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.cpuc.ca.gov/sgip
Tennessee Department of Economic and Community Development (TN)
State
Nuclear supply-chain grants
Programs
Tennessee Nuclear Energy Fund
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
tnecd.com
Wyoming Energy Authority (WY)
State
Matching funds for energy projects incl. nuclear and hydrogen
Programs
Energy Matching Funds
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
wyoenergy.org
Idaho Governor's Office of Energy and Mineral Resources (ID)
State
Energy grants and loans
Programs
Energy programs
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
oemr.idaho.gov
New Mexico Energy, Minerals and Natural Resources Department (NM)
State
Geothermal, storage, hydrogen
Programs
Energy Conservation and Management grants
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.emnrd.nm.gov/ecmd/
New Mexico Finance Authority (NM)
State
Project financing
Programs
Strategic Water / clean energy financing
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.nmfinance.com
Minnesota Department of Commerce (MN)
State
Match for federal clean energy awards
Programs
State Competitiveness Fund
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
mn.gov/commerce/energy/
Virginia Department of Energy (VA)
State
SMR and nuclear grants, storage
Programs
Virginia Nuclear Innovation Fund / energy programs
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
energy.virginia.gov
Virginia Clean Energy Innovation Bank (VA)
State
Low-cost financing
Programs
Clean energy financing
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
energy.virginia.gov
Massachusetts Clean Energy Center (MA)
State
Clean energy grants incl. fusion, offshore wind, storage
Programs
Funding opportunities
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.masscec.com
Oregon Department of Energy (OR)
State
Community renewable and storage grants
Programs
Grants and incentives
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.oregon.gov/energy/Incentives/Pages/default.aspx
South Dakota Governor's Office of Economic Development (SD)
State
Payments for large energy projects
Programs
Reinvestment Payment Program
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
sdgoed.com
Pennsylvania Department of Community and Economic Development (PA)
State
Energy project grants, hydrogen hubs
Programs
PA Energy Development Authority grants
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
dced.pa.gov
Michigan Economic Development Corporation (MI)
State
Large project incentives (Palisades)
Programs
Strategic Outreach and Attraction Reserve (SOAR)
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.michiganbusiness.org
Michigan EGLE (MI)
State
Clean energy grants
Programs
Energy grants
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.michigan.gov/egle/about/organization/materials-management/energy
Ohio Department of Development (OH)
State
Energy loans and grants
Programs
Energy programs
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
development.ohio.gov
Georgia Environmental Finance Authority (GA)
State
Energy loans and grants
Programs
Energy programs
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
gefa.georgia.gov
West Virginia Department of Economic Development (WV)
State
Hydrogen hub and energy incentives
Programs
Office of Energy
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
westvirginia.gov
NYSERDA (NY)
State
Storage, clean energy, advanced nuclear studies
Programs
Funding opportunities
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.nyserda.ny.gov/Funding-Opportunities
New Jersey Board of Public Utilities (NJ)
State
Storage incentive program, clean energy
Programs
Clean energy programs
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.nj.gov/bpu/
NJ Economic Development Authority (NJ)
State
Clean energy grants and loans
Programs
Clean energy financing
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.njeda.gov
North Carolina Department of Environmental Quality (NC)
State
Energy grants
Programs
State Energy Office
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.deq.nc.gov/energy-climate
Indiana Economic Development Corporation (IN)
State
SMR and large-load incentives
Programs
Incentives
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.iedc.in.gov
North Dakota Industrial Commission (ND)
State
Energy research grants
Programs
Lignite and Renewable Energy programs
Stage
Varies
Feed
State funding reader (Claude, daily)
Website
www.nd.gov/ndic/

Capital

DOE - Office of Energy Efficiency and Renewable Energy (EERE) & Tech Offices

DOE - Advanced Research Projects Agency-Energy (ARPA-E)

DOE - Office of Science (SC)

DOE - Office of Fossil Energy and Carbon Management (FECM)

DOE - Office of Nuclear Energy (NE)

DOE - Office of Electricity (OE)

DOE - Office of Technology Transitions (OTT)

DOE - Office of Critical Minerals and Energy Innovation (CMEI) & related offices

DOE SBIR/STTR Program

National Science Foundation (NSF)

Department of Defense (DOD) SBIR/STTR

Department of Agriculture (USDA)

Environmental Protection Agency (EPA)

NASA (limited energy topics)

California Energy Commission (CEC)

Washington State Dept. of Commerce (Clean Energy Fund)

Connecticut Innovations (CI)

Connecticut Green Bank

Colorado Energy Office / related funds

Illinois (DCEO and related)

Hawaii State Energy Office

Other State Energy Offices (e.g., North Dakota, Ohio, Maryland, etc.)

Texas Energy Fund (PUC of Texas) (TX)

Texas Advanced Nuclear Energy Office (Governor's Office) (TX)

TCEQ (TX)

Utah Office of Energy Development (UT)

Utah Governor's Office of Economic Opportunity (UT)

Nevada Governor's Office of Energy (NV)

Nevada GOED (NV)

CPUC (CA)

Tennessee Department of Economic and Community Development (TN)

Wyoming Energy Authority (WY)

Idaho Governor's Office of Energy and Mineral Resources (ID)

New Mexico Energy, Minerals and Natural Resources Department (NM)

New Mexico Finance Authority (NM)

Minnesota Department of Commerce (MN)

Virginia Department of Energy (VA)

Virginia Clean Energy Innovation Bank (VA)

Massachusetts Clean Energy Center (MA)

Oregon Department of Energy (OR)

South Dakota Governor's Office of Economic Development (SD)

Pennsylvania Department of Community and Economic Development (PA)

Michigan Economic Development Corporation (MI)

Michigan EGLE (MI)

Ohio Department of Development (OH)

Georgia Environmental Finance Authority (GA)

West Virginia Department of Economic Development (WV)

NYSERDA (NY)

New Jersey Board of Public Utilities (NJ)

NJ Economic Development Authority (NJ)

North Carolina Department of Environmental Quality (NC)

Indiana Economic Development Corporation (IN)

North Dakota Industrial Commission (ND)