Shares of First Solar Inc. (FSLR) surged by 8% on August 18, 2025, continuing a strong upward trend in the solar energy sector. The stock experienced back-to-back gains of around 10% over two days, supported by a recent golden cross technical indicator and favorable solar subsidy rulings. Other solar-related equities, including NextEra Energy (NXT) and the solar ETF TAN, also saw notable increases, with NXT rising 11%. Trading activity reflected heightened premiums on FSLR options, jumping approximately 43% from $6.80 to $9.70, indicating strong investor interest. Market participants highlighted the effectiveness of day-two long setups and analyst upgrades in driving profits across solar and other sectors. The momentum in solar stocks has drawn attention from traders and analysts, who emphasized the importance of technical setups and sector-specific catalysts in recent market performance.