U.S. grid operators on Saturday stepped up precautions to avoid rotating outages as frigid weather strained power systems, pushing spot wholesale prices on the PJM Interconnection above $3,000 per megawatt hour, a standard unit for electricity. PJM, which serves 67 million people in 13 states and Washington, D.C., raised its forecast for Tuesday to 147.2 gigawatts, an all-time winter high. Dominion Energy, whose Virginia territory hosts a major concentration of data centers, said ice could become one of the largest winter events to hit its operations.
