Sentence:  Across Japan, technology companies and private investors are racing to install devices that until recently they had little interest in: solar panels. Massive solar parks are popping up as part of a rapid build-up that one <WSD>developer</WSD> likened to an "explosion." 
Meaning of the word marked with <WSD> tags:  A real estate developer; a person or company who prepares a parcel of land for sale, or creates structures on that land.