About Primus Power
Primus Power is an Energy & Utilities company based in Hayward (United States) founded in 2009 by Tom Stepien. Zinc bromide flow battery storage is provided for energy applications. Primus Power has raised $92 million across 10 funding rounds from investors including Kleiner Perkins, DOE and California Energy Commission. The company has 18 employees. Its chief executive, as recorded, is Tom Stepien. Its focus areas include Energy Tech, Energy Storage Tech, Energy Storage System and Redox Flow. Its legal entity is PRIMUS POWER CORPORATION.
Company details
Primus Power was founded in 2009 and is based in Hayward, United States. Operations focus on the energy storage sector, where zinc bromide flow batteries are developed for long-duration applications. Fade-free solutions are offered through distributed systems that support transmission capacity enhancement, renewable energy integration, and frequency regulation services.
- Headquarters Hayward, United States
- Employees 18
- Founders Tom Stepien
- SectorsEnergy & Utilities
- Email••••••••
- Phone•••• ••••
- Website primuspower.com/en
- Social LinkedIn X Facebook
- Legal Name Primus Power Corporation
- Total Equity Funding$92M (USD)
in 10 rounds
- Latest Funding Round$32M (USD), Series D
Mar 2017
- InvestorsKleiner Perkins
& 10 more
- Employee Count18
Funding Insights of Primus Power
Primus Power has successfully raised a total of $92M across 10 strategic funding rounds. The most recent funding activity was a Series D round of $32 million completed in March 2017. 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 $92M
- Total Rounds 10
- Last Round Series D — $32M
- First Round $4M
(Aug 2009)
- Investors Count 11
All 10 funding rounds of Primus Power 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 |
|---|---|---|---|---|---|
| Mar 2017 | $32M | Series D | – | Matador Capital Partners, Success Dragon | |
| Sep 2015 | $25M | Series D | – | I2BF Global Ventures, Chrysalix Venture Capital | – |
| Feb 2014 | $20M | Series C | – | Anglo American | |
| Jun 2011 | $1M | Grant | – | – | |
| May 2011 | $11M | Series B | – | I2BF Global Ventures, DBL Partners | |
| Aug 2010 | $4M | Grant | – | – | |
| Jul 2010 | $2M | Grant | – | – | |
| Jan 2010 | $14M | Grant | – | – | |
| Nov 2009 | $14M | Grant | – | – | |
| Aug 2009 | $4M | Series A | – | – |
11 investors in total: 11 institutional.
Investors in Primus Power
Primus Power has secured backing from 11 investors, including venture fund and institutional investors. Prominent investors backing the company include Kleiner Perkins, DOE and California Energy Commission.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Matador Capital is engaged in opportunistic value investing. | matadorcapital.com | Dallas, United States | ||
Venture capital investments are directed toward multiple sectors. | dbl.vc | San Francisco, United States | ||
Early-stage technology companies are funded by this venture capital firm. | i2bf.com | Beverly Hills, United States | ||
Chrysalix Venture Capital is focused on industrial innovation investments. | chrysalix.com | Vancouver, Canada | ||
Venture capital firm investing in early-stage tech startups | 1972 | kleinerperkins.com | Menlo Park, United States | |
Government agency focused on clean energy investments | 1974 | energy.ca.gov | United States | |
High-risk energy technologies are funded through competitive grants. | arpa-e.energy.gov | Washington, Dc, United States | ||
Anglo American is engaged in global mining operations. | angloamerican.co.za | Canada | ||
Delivers comprehensive financial services to businesses and individuals. | 1994 | successdragonintl.com | Kowloon, China | |
Energy sources and policies are managed by the DOE. | 1977 | energy.gov |
Investor details for Primus Power
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
- Complete investor list
- Round participation
- Investor portfolios
- Co-investor network
Verified entity values are shown only after access is granted.
People of Primus Power
7 people are tracked at Primus Power (2 in leadership, 5 in team); the tracked headcount is 18.
| Name | Role | Group |
|---|---|---|
Tom Stepien | Co-Founder & CEO | Leadership |
G.J. La O’ | VP, Technology | Leadership |
Ryan Talbot | Software Engineering Manager | Team |
Darryl Seymour | IT Contractor | Team |
Daren Norman | Test Technician | Team |
Michael Ipsen | Sr. Flow Battery Test Technician | Team |
Doye Odion | Engineering Specialist | Team |
Complete people profiles for Primus Power
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
- Full employee list
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Verified entity values are shown only after access is granted.
Timeline of Primus Power
3 dated milestones of Primus Power across 8 years, from founding to its latest funding, stage changes and deals.
- Founded Primus Power is founded.
- Funding First funding round of $4.0M.
- Funding Latest funding round, Series D, of $32.0M.
Web traffic of Primus Power
The website of Primus Power (primuspower.com) receives about 2K visits a month.
- Monthly visits2K
▲ 42.7% vs previous month
Websites whose visitors overlap most with Primus Power. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
| brightsourceenergy.com | 100% | View details | |||
southernco.com | southernco.com | 91% | #13,274 | – |
Top companies in Energy Storage Systems
3 companies that operate in the same segment as Primus Power (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 Primus Power
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Frequently Asked Questions about Primus Power
Primus Power was founded in 2009.
Primus Power is headquartered in Hayward, United States. It is registered at Hayward, California, United States.
Tom Stepien is the CEO of Primus Power, as recorded in our data. They have also founded this company.
Primus Power is a funded company, having raised a total of $92M across 10 funding rounds to date. The company's 1st funding round was a Series A of $4M, raised on Aug 2009.
Primus Power has 18 employees.
Primus Power was founded in 2009 and is based in Hayward, United States. Operations focus on the energy storage sector, where zinc bromide flow batteries are developed for long-duration applications. Fade-free solutions are offered through distributed systems that support transmission capacity enhancement, renewable energy integration, and frequency regulation services.
Primus Power has 11 investors. Key investors include Kleiner Perkins, DOE, California Energy Commission, Matador Capital, and Anglo American.
Primus Power operates through Primus Power Corporation.