Proton OnSite
Oil and GasConnecticut, United States51-200 Employees
Proton OnSite designs and delivers hydrogen production and gas-generation systems for a range of industrial needs. The equipment is deployed globally, with installation and ongoing support ensuring reliable operation across continents, and the company has expanded its offerings to include broader gas generation and packaged solutions. Headquartered in Wallingford, Connecticut, the company has operated since 1996, serving power plants, semiconductor manufacturers and laboratories. It maintains relationships with the U.S. military, aerospace, fueling and renewable energy industries, reflecting a diversified customer base across defense and energy markets. Since 2017, Proton OnSite has been part of Nel Hydrogen US, following Nel ASA's acquisition of Proton Energy Systems.