Sunnova Energy Corp., among the largest U.S. residential solar third-party ownership providers, is planning an initial public offering that could value the Houston-based company at more than $1 billion including debt, according to a Tuesday report from Reuters citing anonymous sources. Sunnova declined to comment on Reuters’ report that it has filed confidential documents to hold an IPO later this year. The company, founded in 2012, has seen more than $2.5 billion in investment from backers including Energy Capital Partners, Triangle Peak Partners and Quantum Strategic Partners.