Primus Power is a producer of sustainable liquid batteries used for energy storage on the electric grid. The venture backed company is based in Hayward, California and has developed a zinc based flow battery, called the EnergyPod, with support from the Department of Energy. The EnergyPod is similar in size to a hot water heater; an array of 14 are placed within a standard size shipping container to be placed on site next to the electric grid or renewable energy farm. Primus is developing projects for Puget Sound Energy and Bonneville Power Administration and The Marine Corps Airstation in Miramar, California. 
The company has raised $20m in venture funds in 2013 in order to begin manufacturing systems for customers. The Company's energy storage systems decouple instantaneous electricity demand from supply generation, bolstering the stability and security of the electric grid, and helping accelerate the penetration of wind and solar energy. The company has numerous patents in chemistry, cell design, and system engineering, which make the energy density greater and improve reliability and life thus enhancing the price /performance.
- 11:19 a.m. "State tries to save power by storage Page 1 of 2". UTSanDiego.com. Retrieved 2013-09-07.
- "Primus Power’s Flow Battery Powered by $11 Million in Private Investment", Energy.gov, June 14, 2011
- "about us", Primus Power website (Retrieved May 26, 2012
- Seltenrich, Nate. "Green-Energy Storage: 'The Next Big Thing' | Feature | Oakland, Berkeley & Bay Area News & Arts Coverage". Eastbayexpress.com. Retrieved 2013-09-07.
- Eric Wesoff (2013-06-20). "Primus Power Wins Energy Storage Project With Bonneville Power and PSE". Greentech Media. Retrieved 2013-09-07.
- Herndon, Andrew (2013-05-21). "Primus May Name Wind Power Storage Customer Next Month, CEO Says". Bloomberg. Retrieved 2013-09-07.