When a massive fire erupted at one of the world's largest lithium-ion battery storage facilities in Monterey County, it didn't just send a toxic plume of smoke over nearby communities — it cast a shadow of doubt over the future of California's clean energy industry.

Monterey County supervisors on Tuesday declared a state of emergency in response to last week's major fire at the Vistra lithium battery plant in Moss Landing.

Monterey County officials and Vistra Energy executives give press conference as the largest battery fire ever continues to smolder in Moss Landing.