Website: [primuspower.com](https://primuspower.com) ### Introduction Primus Power, founded in 2009, is a private company headquartered in Hayward, California. The company was established by a team of energy storage innovators, though specific founders' names are not widely publicized in recent records. Primus Power employs a modest team, with estimates suggesting around 50-100 employees based on LinkedIn profiles and company descriptions, though exact numbers are not officially confirmed [LinkedIn](https://www.linkedin.com/company/primus-power). Their mission is to provide long-duration, fade-free energy storage solutions for the smart grid, focusing on scalable and cost-effective technologies to support renewable energy integration and grid reliability [primuspower.com](https://primuspower.com/en/about/). As a private entity, Primus Power does not have a publicly traded ticker symbol. The company has positioned itself as a leader in grid-scale energy storage, leveraging innovative flow battery technology to address the growing demand for sustainable energy solutions. Over the years, Primus Power has attracted attention for its unique approach to energy storage, securing government grants and private investments to advance its mission. ### Key Products and Technology Primus Power specializes in flow battery systems for grid-scale energy storage, with the following key product and technology highlights: - **EnergyPod 2 (Flow Battery System)** - **Type**: Zinc Bromine Flow Battery - **Technical Specifications**: Delivers up to 25 kW of power and 125 kWh of energy per unit, with scalability for larger deployments. The system is designed for long-duration storage, offering 5+ hours of discharge capacity. - **Fuel Type or Energy Source**: Utilizes zinc and bromine electrolytes, which are non-flammable and safe for grid applications. - **Key Differentiators**: Offers fade-free performance (no capacity degradation over time), low cost per kWh, and a modular design for easy scalability. The system is also noted for high safety due to its non-toxic materials and lack of thermal runaway risk. - **Development Stage**: Operational, with deployments in pilot projects and commercial applications since the early 2010s. - **Target Customers**: Utilities, renewable energy developers, and grid operators seeking long-duration storage to balance intermittent renewable sources like solar and wind. Primus Power's technology is tailored for applications requiring extended energy storage durations, distinguishing it from lithium-ion solutions that typically focus on shorter durations. Their systems are designed to support grid stability and renewable integration, addressing key challenges in modern energy infrastructure [primuspower.com](https://primuspower.com/en/). ### Regulatory and Licensing Status As an energy storage company focused on flow battery technology, Primus Power is not subject to nuclear-specific regulatory oversight by agencies like the Nuclear Regulatory Commission (NRC). Instead, their regulatory considerations primarily involve compliance with environmental, safety, and grid interconnection standards managed by entities such as the Environmental Protection Agency (EPA), state energy commissions, and regional transmission organizations. Primus Power has not faced significant public regulatory hurdles, and their technology has been recognized as safe and environmentally friendly due to the use of non-toxic materials. There are no widely reported pending regulatory milestones or challenges specific to their deployments. The timeline for commercial deployment is already underway, with systems operational in various pilot and commercial projects since the early 2010s. However, detailed updates on recent regulatory interactions or certifications are limited in publicly available sources. ### Team and Leadership Information on Primus Power’s current leadership team is somewhat sparse in the most recent public records. However, key figures historically associated with the company include: - **Tom Stepien (CEO)**: Tom Stepien has been the CEO of Primus Power for several years, bringing extensive experience in energy technology and business development. He has led the company through multiple funding rounds and technology deployments, focusing on scaling grid storage solutions. - **Steve Eglash (CTO)**: As Chief Technology Officer, Steve Eglash oversees the technical innovation and development of Primus Power’s flow battery systems. His background in materials science and energy storage has been instrumental in advancing the company’s proprietary technology. Current X handles or other social media profiles for these individuals could not be verified in the latest data, and thus are omitted. Leadership details beyond these roles are not widely updated in recent public sources, reflecting a potential gap in current company transparency or media coverage [Bloomberg](https://www.bloomberg.com/profile/company/8382542Z:US). ### Funding and Financial Position Primus Power has raised significant funding over its history, though precise up-to-date figures are not fully disclosed in the latest public records. Key funding milestones include: - **Total Funding**: Over $90 million raised across multiple rounds, as per historical data from Crunchbase and PitchBook. - **Latest Round**: A notable round in 2011 included $11 million in private investment, alongside government grants from the U.S. Department of Energy (DOE) to support flow battery development [DOE.gov](https://www.energy.gov/articles/primus-powers-flow-battery-powered-11-million-private-investment). - **Key Investors**: Investors include DBL Partners, I2BF Global Ventures, and Kleiner Perkins, among others, reflecting strong backing from cleantech-focused venture capital firms [Crunchbase](https://www.crunchbase.com/organization/primus-power). - **Revenue Status**: Primus Power is believed to be generating revenue through pilot projects and early commercial deployments, though it is not yet at full commercial scale. Specific financial performance metrics remain private. As a private company, market cap and stock performance data are not applicable. Recent financial updates are limited, suggesting the company may be operating under a lower public profile in recent years compared to its earlier funding announcements. ### Recent News and Developments | Date | Event | Details | |---------------|--------------------------------|-------------------------------------------------------------------------| | Dec, 2025 | Limited Recent Updates | No significant public announcements or news specific to Primus Power in late 2025. | | Oct 20, 2025 | Company Profile Update | Tracxn published an updated profile on Primus Power, detailing funding and competitors, though no new events reported [Tracxn](https://tracxn.com/d/companies/primus-power/__iY1EBX4ZeLRohwYHO6dxpeM9mDoo2urlMsT429rZR7Q). | | Feb, 2025 | General Industry Focus | Broader energy storage industry news on X highlights long-duration storage, but no specific Primus Power mentions. | | Jan, 2025 | Market Trends | Continued focus on grid-scale storage globally, with Primus Power’s relevance noted in historical context. | | Throughout 2025 | Low Public Activity | Limited news or press releases directly from Primus Power, suggesting a quieter operational or developmental phase. | Note: The lack of recent specific events for Primus Power in 2025 indicates either reduced public activity or limited media coverage. Historical data remains the primary source for understanding the company’s trajectory. ### Partnerships and Collaborations Primus Power has historically engaged in partnerships to advance its technology, though recent updates are scarce: - **U.S. Department of Energy (DOE)**: Received grants and support from the DOE for research and development of flow battery technology, enhancing credibility and funding for early-stage deployments [DOE.gov](https://www.energy.gov/articles/primus-powers-flow-battery-powered-11-million-private-investment). - **Utility Pilot Projects**: Collaborated with utilities for pilot deployments of EnergyPod systems, though specific partners and current status updates are not publicly detailed in recent records. The strategic value of these partnerships lies in validating Primus Power’s technology for grid applications and securing pathways to larger-scale deployments. However, the lack of recent partnership announcements suggests a potential focus on internal development or existing contracts rather than new collaborations. ### New Hampshire Relevance Primus Power’s technology could have potential relevance for [[New Hampshire]]’s energy landscape, though direct connections or expressed interest in the region are not documented. Key considerations include: - **Proximity to Infrastructure**: New Hampshire’s grid is managed under ISO New England (ISO-NE), which prioritizes renewable integration and grid stability. Primus Power’s long-duration storage could support balancing intermittent renewables near facilities like [[Seabrook Station]], though no specific plans for NH deployment exist. - **Technology Readiness**: With operational systems already deployed elsewhere, Primus Power’s technology is ready for potential NH applications, fitting within a near-term deployment timeline if interest arises. - **Alignment with [[Legislation]]**: NH’s legislative initiatives, such as HB 710, emphasize clean energy and grid modernization. Primus Power’s flow batteries align with these goals by enabling renewable energy storage and reducing reliance on fossil fuels. - **Potential Applications**: Applications in NH could include grid power support for ISO-NE, backup for data centers (a growing sector in the Northeast), and industrial load balancing. - **NH Connections**: There are no known direct connections or public statements regarding Primus Power’s interest in New Hampshire or the broader Northeast US market. While the technology fits NH’s energy transition goals, the absence of specific regional focus or partnerships limits immediate relevance without proactive outreach from state stakeholders or the company. ### Competitive Position Primus Power operates in the competitive long-duration energy storage market, facing rivals with similar goals but differing technologies: - **[[Eos Energy Enterprises]]**: Focuses on zinc-based aqueous batteries, offering similar long-duration storage. Eos has seen recent funding and partnership growth, potentially outpacing Primus Power’s public momentum based on 2025 X posts [X posts on Eos Energy](https://x.com/PoweredByEos). - **[[Form Energy]]**: Develops iron-air batteries for multi-day storage, with significant recent funding ($450 million in 2022). Form Energy’s scale and investor backing present a competitive challenge [X post by Jesse Jenkins](https://x.com/JesseJenkins/status/1577380085489078272). - **[[ESS Inc]].**: Another flow battery competitor using iron-salt chemistry, ESS has gained traction with recent project announcements and scalability focus, potentially overshadowing Primus Power’s quieter profile. Primus Power’s unique advantage lies in its fade-free performance and safety profile, but its limited recent visibility and funding updates pose risks compared to competitors with more aggressive growth narratives. ### Closing Note Primus Power remains a notable player in long-duration energy storage with operational technology, though its current trajectory appears less publicly dynamic compared to competitors, warranting cautious optimism for future growth. *Report generated December 24, 2025*