The states have been major beneficiaries of the Biden administration’s key economic policies, such as spending on infrastructure, manufacturing and clean energy.
Demand for lithium, which is used in electric vehicle batteries, has soared but domestic production of the metal has lagged behind other countries.
Executives of companies with clean energy projects are facing questions about the potential for a rollback of the law and its incentives if a Republican wins.
Biden administration officials opted to make a broad set of locations eligible for the tax credits, covering much of the country outside of major cities.
Lawmakers approved $5 billion for states to build a network of fast chargers two years ago. Although some states have made progress in recent weeks, most have not yet awarded contracts or started construction.
The White House and bipartisan lawmakers have agreed on a package that would provide funding for roads, bridges and other physical infrastructure.