Federal regulators suspended a plan to secure new power for data center growth on the nation’s largest grid while they examine who should pay. The Federal Energy Regulatory Commission (FERC) accepted most of PJM Interconnection’s one-time “backstop” procurement on Sept. 29 but suspended it until Feb. 28, 2027, and questioned how PJM planned to divide the costs among customers. PJM — which runs the grid for about 67 million people in 13 states an…