Constellation Energy stock tumbles nearly 10% as PJM power-price curbs enter the frame
Constellation Energy shares fell 9.8% to $307.71 Friday after the White House ordered PJM to hold an emergency power auction and cap capacity market prices. PJM detailed new rules for large data centers, including requiring them to provide their own generation or face curtailment. Vistra and NRG Energy also dropped. U.S. markets will be closed Monday for MLK Day.