Sunnova Energy International Inc., a leading US rooftop solar company, has filed for bankruptcy in Texas, citing significant debt and declining sales. With assets and liabilities estimated between $10 billion and $50 billion, the company faced challenges from high interest rates and regulatory uncertainties, leading to a 55% workforce reduction earlier this year. The solar industry is increasingly vulnerable to interest rate hikes and regulatory changes, as demonstrated by Sunnova's struggles and the broader trend of bankruptcies among solar firms, highlighting systemic issues within the sector.