The “Series E” funding round increases to $530m the amount of equity the California company has attracted in a few short years.

The financing came from BrightSource’s existing investors, which range from big name venture capital firms Vantage Point Venture Partners to the venture arms of oil giants Chevron and BP.

Alstom poured $75m in this round, which, when added to the $55m it invested last year, and its Mediterranean and African project development partnership with BrightSource,