Aluminium plants are particularly vulnerable because the electrolysis "pots" must be kept hot, requiring a continuous supply of electricity. Supply interruptions can be a disaster.

This has hit Venezuela badly: https://twitter.com/AKurmanaev/status/1104141813936545793 "Today Venezuela basically crossed off an entire industry. In one day. No more industrial aluminum production. Just like that. It’s gone."

https://www.argusmedia.com/en/news/1863707-venezuelas-fragil... "State-owned aluminum smelter Venalum's remaining operational units and state-owned Bauxilum's alumina production units were destroyed by the blackout and likely will not be repaired for at least a year, a senior Venalum official said. "The primary aluminum and alumina sectors are dead for the foreseeable future." "