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Heat forecast threatens record demand on US electric grid

Heat forecast threatens record demand on US electric grid
Heat forecast threatens record demand on US electric grid

The U.S. power systems are under pressure this week from a 'blistering heatwave' that will hit the East Coast and Midwest. This is expected to cause a record-breaking summer?demand, straining the system already strained by the surge in energy consumption?by electric vehicles and data centers. According to the latest forecast from PJM Interconnection (the largest regional grid that serves 67 million people), the record summer demand for electric power is 166.3 gigawatts on Thursday evening. PJM's record for summer demand, set in 2006 at 165.6 GW, is the highest ever.

PJM has described the "unlikely, but plausible" scenarios that could lead to a demand of up 169 GW.

The regional grid operator, PJM, serves 67,000,000 customers in the Mid-Atlantic region, South, and Washington D.C. It has a total of?180.2 GW in generation capacity, plus 8 GW that comes from programs to reward customers who reduce their 'electricity usage in times of emergency. The temperature is expected to reach 100degF, or 38degC, from Boston to Washington, D.C., close to Northern Virginia's vast hub of data centers. This will cause a surge in demand for air conditioning, which will put additional strain on power grids before the July 4th celebrations.

New York ISO, grid operator of New York, warned that when temperatures and humidity rise, an increased demand for air conditioning can strain the generation and transmission resources. According to NYISO, peak demand in New York will be around 32 GW this Thursday, which is just short of the previous record of almost 34 GW.

According to Midcontinent Independent System Operator's (MISO) forecasts, MISO is the regional grid operator of 15 U.S. States in the Midwest and South. It expects to surpass the peak demand record set by 127.1 GW.

MISO will rely heavily on PJM to meet peak demand. PJM's executives are cautious about the operator's ability to handle "a fundamental mismatch" between how quickly demand is increasing and how quickly new supply can be built and connected.

In a report published in May, PJM stated that "the region is simultaneously facing hyperscale data centres adding load at an unheard of pace, accelerated economic and policy-driven retirements,?and?new power plants which take twice as long to construct and?cost double as much as ten years ago."

PJM operates on a thin 'buffer' against power plants tripping off and?persistent congested transmission lines. On Monday evening for instance, PJM's strain was apparent as the real-time wholesale electric prices soared to over $1,600 per Megawatt Hour, compared to less than $40 earlier in that day. The evening price reflected the heavy congestion of high-voltage power lines during peak electricity use. Reporting by Tim McLaughlin, Editing by Chizu nomiyama

(source: Reuters)