For instance, CPV competitor Amonix earlier this year shuttered its Nevada factory.

FORBES: Another U.S. Solar Manufacturer Shuts Down

But concentrating photovoltaic, or CPV, technology is expensive and as the cost of solar panels plunged 75% over the past three years companies like GreenVolts have found it increasingly difficult to compete.

FORBES: Another U.S. Solar Manufacturer Shuts Down