Some do, but that implies on-site supply of gas (oil would not be used for aluminium production much). Building smelters next to coal fields is a way of produc

Some do, but that implies on-site supply of gas (oil would not be used for aluminium production much). Building smelters next to coal fields is a way of producing cheap aluminium. Coal is still the cheapest way to make electricity - it's only places where the government has explicitly made this not the case that coal is expensive. Generally unfavourable government regulations simply moves production to places without the regulation - for no net change in production or coal consumption. Sometimes it's a net negative if the new location has lower local emissions standards and technology.