# Alumni Ventures' Energy Investments: 15 Startups in Its Portfolio (2026) > The 15 Energy startups Alumni Ventures has backed, by stage: $659M raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-energy-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Stage not reported 5 - [Aalo Atomics](https://millionrounds.com/company/aalo-atomics) - [*AA* Apollo Atomics](https://millionrounds.com/company/apollo-atomics) - [Realta Fusion](https://millionrounds.com/company/realta-fusion) - [Akselos](https://millionrounds.com/company/akselos) - [South 8 Technologies](https://millionrounds.com/company/south-8-technologies) ## Pre-seed and seed 5 - [Radiant](https://millionrounds.com/company/radiant) - [Powerline](https://millionrounds.com/company/powerline) - [RenewaFi](https://millionrounds.com/company/renewafi) - [Maritime Fusion](https://millionrounds.com/company/maritime-fusion) - [ionobell](https://millionrounds.com/company/ionobell) ## Series A 3 - [RedoxBlox](https://millionrounds.com/company/redoxblox) - [*AE* Alva Energy](https://millionrounds.com/company/alva-energy) - [David Energy](https://millionrounds.com/company/david-energy) ## Growth 2 - [Mainspring Energy](https://millionrounds.com/company/mainspring-energy) - [SMART WIRES](https://millionrounds.com/company/smart-wires) ## Segment by segment ### Stage not reported 5 startups · $172M raised - [**Aalo Atomics**](https://millionrounds.com/company/aalo-atomics) Aalo Atomics manufactures and develops nuclear power plants for clean energy production. United States $103M - [*AA* **Apollo Atomics**](https://millionrounds.com/company/apollo-atomics) United States $32M - [**Realta Fusion**](https://millionrounds.com/company/realta-fusion) Realta Fusion develops fusion energy technology for the production of industrial heat and power. United States $19M - [**Akselos**](https://millionrounds.com/company/akselos) Akselos is a developer of digital twin technology designed to protect critical infrastructures. Switzerland $10M - [**South 8 Technologies**](https://millionrounds.com/company/south-8-technologies) South 8 sells LiGas®, a liquefied gas electrolyte for Lithium-ion batteries. United States $9.2M ### Pre-seed and seed 5 startups · $29M raised - [**Radiant**](https://millionrounds.com/company/radiant) Radiant is a creative agency that offers digital media and business development services. France $8.4M - [**Powerline**](https://millionrounds.com/company/powerline) Powerline is a climate-tech company based in Palo Alto, California, focused on transforming the global electricity grid. United States $7.0M - [**RenewaFi**](https://millionrounds.com/company/renewafi) RenewaFi offers a renewable energy marketplace. United States $5.0M - [**Maritime Fusion**](https://millionrounds.com/company/maritime-fusion) Maritime Fusion is a San Francisco-based alternative energy equipment company founded in 2024. United States $4.5M - [**ionobell**](https://millionrounds.com/company/ionobell) Ionobell is a battery technology company based in San Jose, California, specializing in silicon-dominant battery solutions for aut United States $3.9M ### Series A 3 startups · $96M raised - [**RedoxBlox**](https://millionrounds.com/company/redoxblox) RedoxBlox is a post-Series A startup based in San Diego, California, focused on transforming the energy sector with its innovative United States $40M - [*AE* **Alva Energy**](https://millionrounds.com/company/alva-energy) United States $33M - [**David Energy**](https://millionrounds.com/company/david-energy) David 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 Energy**](https://millionrounds.com/company/mainspring-energy) Mainspring Energy is a power generation company based in Menlo Park, California, founded in 2010. United States $258M - [**SMART WIRES**](https://millionrounds.com/company/smart-wires) Smart 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. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Sector portfolio **Alumni Ventures' AI portfolio** 302 startups · $36B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-ai-portfolio)[Sector portfolio **Alumni Ventures' Fintech portfolio** 85 startups · $5.9B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-fintech-portfolio)[Sector portfolio **Alumni Ventures' Healthtech portfolio** 65 startups · $5.7B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-healthtech-portfolio)[Sector portfolio **Alumni Ventures' Biotech portfolio** 57 startups · $2.3B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-biotech-portfolio)[Sector portfolio **Alumni Ventures' Big Data & Analytics portfolio** 53 startups · $1.2B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-big-data-analytics-portfolio)[Sector portfolio **Alumni Ventures' Web3 & Crypto portfolio** 36 startups · $2.4B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-web3-crypto-portfolio) ## Raising from investors like Alumni Ventures? 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