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Exelon’s “high probability” data center load fell nearly 40%, to about 11 GW, in the second quarter from 18 GW at the end of last year, the Chicago-based utility company said Thursday.

The decline comes as Exelon utilities have been entering into “transmission security agreements” with potential data center customers, it said. The TSAs include provisions designed to protect existing ratepayers from data center-related costs such as credit obligations, committed revenue contributions and shortfall payments.

“What this update reflects is [that] we now weed out speculative projects, and it gives us proactive insight into what is real,” Jeanne Jones, Exelon CFO, said during an earnings conference call with equity analysts.

As part of the weedout of data center projects, Exelon’s Commonwealth Edison subsidiary on July 24 told the Federal Energy Regulatory Commission it had canceled a previously approved TSA with PowerHouse Hillwood Holding. Key information about the project related to the TSA was redacted in ComEd’s original application at FERC. However, Hillwood and PowerHouse Data Centers have been planning a 1.8-GW, $20 billion data center in Joliet, Illinois.