Apple has signed a $500 million deal with MP Materials for China-free rare earth magnets, strengthening US supply chains after Chinese export curbs and boosting Pentagon-backed MP’s market position.

MP Materials, the operator of the only rare earths mine in the United States, has signed a $500 million deal with Apple.

Federal tax credits for rooftop solar, heat pumps and other energy-efficient technologies are going away at the end of the ...