A blackout that occurred at about 8:45 p.m. Wednesday night has kept much of Puerto Rico in the dark, with residents reliving Hurricane Maria scenarios where the sound of generators, the scorching heat and concern for lack of essential services were rising Friday. Wayne Stensby, president and chief executive officer of LUMA Energy, the company that in June 2021 took over the reins of the transmission and redistribution of energy on the island, said the company believes the blackout was caused by a fire in a breaker in a plant in Guayanilla at the southern area of the island. It made the plant …