GreenVolts, a US-based company providing solar power concentration technology for utilities, has raised nearly two-thirds of its latest round of financing.
In a regulatory filing first seen by data provider CB Insights, GreenVolts has raised $22.4m from 19 investors out of a planned $38.8m round.
Previously, Greenvolts raised $30m in September 2008 for its series B round from venture capital firm Oak Investment Partners. Its $10m series A round the year before came from Greenlight Energy Resources, an operator of renewable energy projects, and included US utility Avista, which was trialling GreenVolts’ technology, as well as other unnamed investors.