Rick Wilson, chief executive of Cobalt, said: "In addition to the generous financial support provided by the Whittemore Collection, we now have the world's most experienced builder of biomass-based businesses on our board supporting us in developing our global enterprise."

Mitsui's corporate venturing unit has joined the consortium investing $45m in clean-tech firm BioAmber and floated Boingo Wireless.

In March, SustainX raised $14.4m from seven investors, including GE Energy Financial Services and VC firms Cadent Energy Partners, Polaris Venture Partners and Rockport Capital Partners, as part of a then-planned $17m round.

There is an opportunity to source-adapt-integrate-adopt a new breed of advanced technologies into new platforms and leapfrog entire legacy generations of capabilities.

In return for selling some equity, SCI has struck a global strategic alliance with semiconductor company Intel and raised more than $19m from General Electric (GE) and venture capital firm Triangle Peak Partners.

Goldman Sachs, Citigroup and Deutsche Bank are serving as co-lead underwriters for US-based solar power tower developer BrightSource Energy's flotation, although their peer Morgan Stanley, which owns 10.5% of its portfolio company.

In June, Tigo Energy raised $10m from two strategic investors and three independent venture capital firms and has now raised the same again from Generation Investment Management's Climate Solutions Fund.

Energy Technology Ventures, a General Electric-NRG Energy-ConocoPhillips joint venture, and Aster Capital, backed by European industrial groups Alstom, Schneider Electric and Rhodia, are two funds backing Ioxus, a US-based battery maker.

TGS will pay $45m initially and up to $35m in performance fees for Stingray Geophysical.

US-based natural gas production start-up Nuevo Midstream has raised $65m from EnCap Energy Infrastructure Fund, Torch Energy Advisors and Petroleum Fuels Company.