Sector portfolio · VC firm · United States
Alumni Ventures' Energy portfolio
Alumni Ventures has backed 15 Energy startups in rounds we track, $659M between them, shown by the stage each has reached. The best-funded is Mainspring Energy.
Funding by segment
- Stage not reported$172M5
- Pre-seed and seed$29M5
- Series A$96M3
- Growth$362M2
Where they are based
- United States13$641M
- Switzerland1$10M
- France1$8.4M
United States
Switzerland
FranceFounded
2 without a founding year on record.
Total raised
- Under $1M0
- $1M to $10M6
- $10M to $50M6
- $50M to $250M2
- $250M to $1B1
- $1B and over0
Each dot is a startup: the year it was founded across, the total it has raised up (each line is ten times the one below). Pick a segment to pick it out.
13 of 15 startups shown; the rest have no founding year or amount on record.
- 1 to 2
- 3 to 7
- 8 to 24
- 25 to 99
- 100 and more
- United States13
- Switzerland1
- France1
Startups by country, 3 countries in all.
Segment by segment
Stage not reported
5 startups · $172M raised
Aalo AtomicsAalo Atomics manufactures and develops nuclear power plants for clean energy production.United States$103M- AAApollo AtomicsUnited States$32M
Realta FusionRealta Fusion develops fusion energy technology for the production of industrial heat and power.United States$19M
AkselosAkselos is a developer of digital twin technology designed to protect critical infrastructures.Switzerland$10M
South 8 TechnologiesSouth 8 sells LiGas®, a liquefied gas electrolyte for Lithium-ion batteries.United States$9.2M
Pre-seed and seed
5 startups · $29M raised
RadiantRadiant is a creative agency that offers digital media and business development services.France$8.4M
PowerlinePowerline is a climate-tech company based in Palo Alto, California, focused on transforming the global electricity grid.United States$7.0M
RenewaFiRenewaFi offers a renewable energy marketplace.United States$5.0M
Maritime FusionMaritime Fusion is a San Francisco-based alternative energy equipment company founded in 2024.United States$4.5M
ionobellIonobell is a battery technology company based in San Jose, California, specializing in silicon-dominant battery solutions for autUnited States$3.9M
Series A
3 startups · $96M raised
RedoxBloxRedoxBlox is a post-Series A startup based in San Diego, California, focused on transforming the energy sector with its innovativeUnited States$40M- AEAlva EnergyUnited States$33M
David EnergyDavid Energy is a technology-driven retail energy provider based in New York City, founded in 2019.United States$23M
Growth
2 startups · $362M raised
Mainspring EnergyMainspring Energy is a power generation company based in Menlo Park, California, founded in 2010.United States$258M
SMART WIRESSmart Wires is a grid solutions company that offers monitoring and power flow control in meshed networks.United States$104M
How this map is made. Every startup here works in Energy and has raised money in a round we track that names Alumni Ventures as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026.
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