A international syndicate of corporates and venture investors join various US public bodies supporting the energy storage company.

International corporates 3M, Total, Mitsui, and Tokyo Electron all helped US-based energy storage company EnerVault raise $15.5m.

Investors in the company, which raised its series B round yesterday, included US-based industrial company 3M, joined Total Energy Ventures, a corporate venturing unit of the France-based oil & gas company, Mitsui Global Investments, a corporate venturing unit of the Japanese conglomerate, and TEL Venture Capital, a corporate venturing unit of Tokyo Electron.

Other backers also included natural gas provider Commercial Energy…