IRVING, Texas, August 18, 2026, 06:15 EDT — U.S. cash markets remain shut as premarket activity continues. Vistra reported fleet availability of at least 97% during recent heat waves in Texas and PJM.Generation EBITDA for the second quarter jumped 67.6%, significantly outpacing growth in retail EBITDA.The analyst consensus target of $228.56 suggests potential upside of…