Eastern US Faces Extreme Heat-Induced Grid Strain
Extreme heat across the eastern United States pushed regional electric grid operators to the brink on Tuesday, requiring swift action to prevent widespread blackouts. With temperatures exceeding 100 degrees Fahrenheit (38 degrees Celsius), power generation margins were critically low. Transmission lines, strained by the intense heat, experienced congestion and significant price spikes. New York City saw wholesale electricity prices surge to nearly $2,400 per megawatt hour (MWh), while Long Island prices reached over $7,000 per MWh. New York ISO, the state's grid operator, issued warnings about potential emergency actions as operating reserves dwindled. PJM Interconnection, serving a substantial portion of the U.S. population, implemented voluntary electricity reduction programs, instructing utilities to curtail power to customers. PJM also faced challenges with generation output, as gas-powered turbines were limited in their capacity due to the extreme heat. ISO New England, covering six states including Boston, experienced peak wholesale prices exceeding $1,500 per MWh, more than triple Monday’s peak prices. To mitigate the situation, the U.S. Department of Energy mandated Duke Energy Carolina to maximize output from specific generating units in the Southeast. ISO New England declared a “Power Caution” following unexpected generation losses and employed reserve resources to balance supply and demand. Duke Energy acknowledged potential generation shortfalls and advised wholesale customers to limit usage, anticipating a reduction in demand of up to 1,000 megawatts. Grid operators employed various strategies including increased imports, deferred maintenance, and activation of standby power units. ISO New England proactively restricted maintenance activities at power plants. Electricity demand was projected to peak around 26,000 MW, below the record of 28,130 MW set in 2006.
