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.

Hartford Ventures' backing of Coulomb Technologies reaps strategic benefit.

Alstom invested $75m in BrightSource's E round, in addition to $55m committed last year as part of a $176m D round.

US-listed disposal company Waste Management and Total Energy Ventures International, the corporate venturing unit of French oil major Total are new investors in Agilyx.

FutureE Fuel Cell Solutions gains an undisclosed amount from a T-Venture-led consortium.