The solar industry is in expansion mode, again. First Solar — the U.S. maker of thin solar panels, which is seen as a bellwether for the industry — said this week that they plan to boost their solar panel production by as much as 46 percent in 2015.

SolarCity, the solar installer founded by Elon Musk’s cousins the Rive brothers, is building its first solar panel factory in New York and expects to roughly double the amount of solar installations to between 920MW to 1,000MW in 2015, company executives said this week during a call with analysts to discuss its third-quarter earnings.

Seems like the boom is back! Or is it?