Solar investment fell in 2018, according to new data out from Bloomberg New Energy Finance, dropping nearly a quarter from 2017. At the same time, Bloomberg NEF said it was a record year for solar capacity, which topped 100 gigawatts. Total global clean energy investments were down 8 percent over 2017 according to the research firm, ringing up at $332.1 billion compared to $361.7 billion in 2017.