With federal subsidies ending or becoming hard to claim, companies are racing ahead with solar, wind and battery projects.

© Kyle Grantham for The New York Times

The S&P 500 slumped more than 2 percent for the first time in six months, rattling investors after a long stretch of gains.

The oil giant said Tuesday that it was acquiring assets from a Chicago company as it looks to start producing graphite, a key battery ingredient, by the end of the decade.