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It is often used in the production of cast iron and stainless steels as well as some paint pigments, biofuels and solar panels.

Some also questioned whether those without solar panels would actually see a reduction in their electric bills if the measure passed.

Calderon is sponsoring legislation favored by Edison that would slash the credits that many homeowners receive for generating electricity with rooftop solar panels.

Lithium – not a rare earth, but a crucial metal in the production electric vehicle batteries and solar panels – is a good example.

Edison and the state’s two other big for-profit utilities have long tried to reduce the energy credits that incentivized Californians to invest in the solar panels.