Simplify the following text for a Grade 6 native English-speaking person.
Original: The solar thermal power industry is growing rapidly with 1.2 GW under construction as of April 2009 and another 13.9 GW announced globally through 2014 .
Simplified: The solar thermal power industry is growing fast with 1.2 GW under construction as of April 2009 and another 13.9 GW announced globally through 2014 .