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The largest US electric grid increases warnings in hot temperatures

The largest U.S. grid operators PJM issued a series warnings on Wednesday as temperatures soared, and congestion in transmission lines increased the spot price of wholesale electricity.

PJM warns of low voltages and heavy loads on transmission lines. PJM data showed congestion on transmission lines, especially around Northern Virginia, which is home to the world's largest concentration of data?centers.

According to the latest results of its annual capacity auction, PJM announced on Tuesday that it would cost more than $16 billion to ensure 'enough electricity supply to cover the most-demand days in the grid,' according to the company's report. PJM reported that without price caps the cost 'would have been almost $30 billion.

The auction fell'short' of PJM's'reserve margin' target by approximately 7 GW. This weakened the grid's cushion against wild weather events and other unforeseen circumstances.

The auction this year confirms a trend that is unacceptable: the growth of data centers outpaces new electricity supplies, degrading reliability and keeping prices capped, said Claire Lang-Ree - a climate and Energy advocate with National Resources Defense Council.

PJM predicted that electricity?demand on Wednesday would reach 164.1 gigawatts at 6 p.m. Eastern Time (EDT) as air?conditioning usage surged. In PJM's area, temperatures hovered at 90 degrees Fahrenheit, or 32 degrees Celsius, in Chicago, Philadelphia, and Washington, D.C., as an example. PJM achieved an all-time demand record of 168.2 GW in July.

Due to heavy congestion on transmission lines, the spot price of?electricity soared to more than $300 per megawatt-hour around midday on Wednesday. Prices were $30 per megawatt hour earlier in the day before businesses and residents turned up their air conditioners.

(source: Reuters)