(BCN) -- U.S. Highway 1 near Moss Landing fully reopened at 5 p.m. Sunday following a closure due to a fire at one of the world's largest battery storage facilities this week, according to Monterey County.   Lithium-ion batteries at the Vistra Energy facility that caught fire Thursday continued to burn out by Saturday but could still reignite, officials said. There was no estimate on how long the fire would last, and the cause was still unknown.   Evacuations ordered after fire erupts at Moss Landing power plant Travelers in the area are urged to be alert for emergency responders still on the scene at the incident command center near the Moss Landing Energy Storage Facility and the California Highway Patrol will remain active in the area, the county said Sunday.   North County Fire Protection District Chief Joel Mendoza said about 80% of the structure and its batteries were destroyed in the fire.     On Sunday, the county said conditions continued to improve at the fire location but that no threats to public safety had been detected from gases or particulates.     Evacuations were lifted on Friday evening after about 1,200 people were told to leave the area because of concerns about air quality.     The cause was still unknown on Saturday afternoon, including why the plant's internal fire suppression system failed.     The Moss Landing plant is operated by Texas-based Vistra Corp., which has seen its stock price soar in the last year from about $39 to about $171 at the close of trading on Friday.     Silver Alert issued for missing Hayward man, 74 While evacuation orders were lifted, state Highway 1 remained closed in both directions at the plant through Sunday evening.       PG&E also has its own battery storage facility at the site that is still online. Local elected officials including county Supervisor Glenn Church said he was urging Vistra to keep its facility offline until the cause of the fire is known and more prevention is put in place. It remained closed as of Sunday evening.     A company official, Brad Watson, reiterated the company's apology to the community and said the company was trying to determine what caused the failure. He was noncommittal on ongoing operations, responding to a reporter's question about remaining offline by saying that the company was focused on the present situation. Copyright © 2025 Bay City News, Inc.  All rights reserved.