Exhibit 99.1 Sunnova Reports First Quarter 2024 Financial Results First Quarter 2024 Highlights • Deployed 27,000 customers in the first quarter of 2024; bringing total customer count to 438,500 as of March 31, 2024; • Total Adjusted Operating Expense decreased in the first quarter of 2024 compared to the prior quarter; • Unrestricted Cash increased $18.9 million in the first quarter of 2024 compared to the prior quarter; and • Selected as exclusive national solar and battery storage services provider for T ...