Data center load accounted for $6.5 billion, or 40%, of the $16.4 billion in costs from the PJM Interconnection’s December capacity auction, according to the grid operator’s independent market monitor. About $6.2 billion of those costs is related to data centers that haven’t been built but could come online by PJM’s 2027/28 delivery year that begins on June 1, 2027, Monitoring Analytics, the market monitor, said in a report released Monday. In PJM’s last three base capacity auctions, costs related to data center…