About Adden Energy
Adden Energy is an Energy & Utilities company based in Waltham (United States) founded in 2021 by William Fitzhugh. Solid-state battery solutions and electrolytes are provided through advanced algorithms. It operates on a Product-as-a-Service and Direct-to-Consumer (D2C) model. Adden Energy has raised $63.65 million across 6 funding rounds from investors including Harvard University, Primavera Capital Group and At One Ventures. Its chief executive, as recorded, is William Fitzhugh. Adden Energy offers products and services including Dynamically-Stable Battery and AI-Driven Mobility Solutions. Its focus areas include Energy, Renewable Energy, Battery Technology and Technology. Its legal entity is Adden Energy, Inc. Its competitors include Ampcera, Safire Technology Group and Ionic Materials; 3 of its 3 listed competitors have raised funding.
Company details
Adden Energy is engaged in the development of dynamically-stable, self-healing battery technology primarily for electric vehicles. The companys innovations are rooted in discoveries made at Harvard, focusing on solid-state separators and advanced battery components. Solutions are extended to sectors like drones, data centers, and robotics. Emphasis is placed on safety with non-flammable materials, longer driving ranges, and rapid charging capabilities. The technology is aimed at surpassing traditional combustion engines and enabling AI-driven mobility applications.
- Headquarters Waltham, United States
- Founders William Fitzhugh
- SectorsEnergy & Utilities
- Website addenenergy.com
- Social LinkedIn
- Legal Name Adden Energy, Inc
- Total Equity Funding$63.65M (USD)
in 6 rounds
- Latest Funding Round$26.6M (USD), Series C
Oct 2026
- InvestorsHarvard University
& 5 more
Products & Services of Adden Energy
Adden Energy offers a comprehensive portfolio of products and services, including Dynamically-Stable Battery and AI-Driven Mobility Solutions.
Innovative battery technology is developed for electric vehicles.
AI solutions are provided for advanced mobility applications.
Funding Insights of Adden Energy
Adden Energy has successfully raised a total of $63.65M across 6 strategic funding rounds. The most recent funding activity was a Series C round of $26.6 million completed in October 2026. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $63.65M
- Total Rounds 6
- Last Round Series C — $26.6M
- Investors Count 6
All 6 funding rounds of Adden Energy with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Oct 2026 | $26.6M | Series C | – | – | – |
| Sep 2026 | $16.9M | Series B | – | – | – |
| Aug 2024 | $15M | Series A | – | At One Ventures | |
| Apr 2024 | $274,990 | Grant | – | – | |
| Sep 2022 | Grant | – | – | ||
| Sep 2022 | $5.15M | Seed | – | Primavera |
6 investors in total: 6 institutional.
Investors in Adden Energy
Adden Energy has secured backing from 6 investors, including venture fund and institutional investors. Prominent investors backing the company include Harvard University, Primavera Capital Group and At One Ventures.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
| atoneventures.com | ||||
Private equity investments in China are managed by Primavera. | 2010 | primavera-capital.com | Beijing, China | |
Early-stage tech & life sciences focused VC firm investing in geographies such as the US | rhapsodyvp.com | Cambridge, United States | ||
Tech focused early stage VC firm investing in the US | mass-ventures.com | Boston, United States | ||
A government-backed foundation providing seed-stage investments to support small businesses. | 1950 | nsf.gov | Arlington, United States | |
Various academic programs and degrees are offered in diverse fields. | 1636 | harvard.edu | Cambridge, United States |
Investor details for Adden Energy
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
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People of Adden Energy
5 people are tracked at Adden Energy (5 in leadership).
| Name | Role | Group |
|---|---|---|
William Fitzhugh | Co-Founder & CEO | Leadership |
Kimberly Branson | VP | Leadership |
Luhan Ye | Chief Technology Officer | Leadership |
Xin Li | Co-Founder | Leadership |
Pu Zhang | Chief Product Officer | Leadership |
Complete people profiles for Adden Energy
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Timeline of Adden Energy
3 dated milestones of Adden Energy across 5 years, from founding to its latest funding, stage changes and deals.
- Founded Adden Energy is founded.
- Funding First funding round.
- Funding Latest funding round, Series C, of $26.6M.
Competitors of Adden Energy
Adden Energy has 3 listed competitors in our database, 3 of them funded. They include Ampcera, Safire Technology Group and Ionic Materials.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| ampcera.com | 2017 | Milpitas, United States | $15M | Solid-state electrolyte materials for lithium batteries are developed. | ||
| safire.co | 2020 | Mclean, United States | $10.91M | 3 | Hybrid-state shear thickening battery safety technology is developed. | |
| ionicmaterials.com | 2012 | Woburn, United States | $65M | 40 | Solid polymer electrolytes for solid-state batteries are developed. |
Detailed competitors of Adden Energy
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- Full competitor set
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Web traffic of Adden Energy
The website of Adden Energy (addenenergy.com) receives about 1.6K visits a month.
- Monthly visits1.6K
▲ 108.7% vs previous month
Top companies in Energy Storage Systems
3 companies that operate in the same segment as Adden Energy (Energy Storage Systems) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
Electric buses and charging systems are manufactured for fleets. | 2004 | Burlingame, California, United States | USD 857.79 M | USD 309.36 M | 418 | |
Silicon-based solar PV modules are manufactured for diverse applications. | 1985 | San Jose, California, United States | USD 171.73 M | USD 300 M | 600 | |
Iron-air energy storage systems are developed for renewable energy projects. | 2009 | Somerville, Massachusetts, United States | USD 2 B | 902 |
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Related news about Adden Energy
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Frequently Asked Questions about Adden Energy
Adden Energy was founded in 2021 and raised its 1st funding round 1 year after it was founded.
Adden Energy is headquartered in Waltham, United States. It is registered at Waltham, Massachusetts, United States.
William Fitzhugh is the CEO of Adden Energy, as recorded in our data. They have also founded this company.
Adden Energy is a funded company, having raised a total of $63.65M across 6 funding rounds to date.
Adden Energy is engaged in the development of dynamically-stable, self-healing battery technology primarily for electric vehicles. The companys innovations are rooted in discoveries made at Harvard, focusing on solid-state separators and advanced battery components. Solutions are extended to sectors like drones, data centers, and robotics. Emphasis is placed on safety with non-flammable materials, longer driving ranges, and rapid charging capabilities. The technology is aimed at surpassing traditional combustion engines and enabling AI-driven mobility applications.
Adden Energy's top competitors include Ampcera, Safire Technology Group and Ionic Materials.
Adden Energy offers Dynamically-Stable Battery and AI-Driven Mobility Solutions.
Adden Energy has 6 investors. Key investors include Harvard University, Primavera Capital Group, At One Ventures, Rhapsody Venture Partners, and MassVentures.
Adden Energy operates through Adden Energy, Inc.