Largest US grid paid up to $28,000 per megawatt to balance electricity during heat wave

• PJM set an all-time peak load record of 168 gigawatts on July 2, with reserve deficits and transmission congestion near Baltimore, Delaware, and northern Virginia's data center hub driving extreme pricing
• Capacity prices for peak demand have surged over 1,000% since 2024 as electricity demand growth from data centers, EVs, and heat pumps outpaces new generation additions
• PJM's independent market monitor says the grid's regulation market design overestimates balancing costs, with balancing costs ultimately passed to consumers through electricity bills

Summary: PJM Grid Faces Extreme Balancing Costs During Heat Wave

Key Developments:

PJM Interconnection, the largest U.S. electricity grid serving 67 million people across the Mid-Atlantic and Washington D.C. region, paid market-clearing prices up to $28,000 per megawatt for balancing services during last week's heat wave—over 100 times higher than the 2024 average. The spike occurred on July 2 when electricity demand surged and PJM hit an all-time peak load record of 168 gigawatts.

Financial Impact:

• Q1 2024 balancing costs reached $217 million, up 215% year-over-year
• During a January cold snap, prices peaked at $47,192 per megawatt versus a monthly average of $139
• PJM capacity prices have increased over 1,000% since 2024
• These costs are passed directly to consumers through electricity bills

Contributing Factors:

Reserve deficits and severe transmission congestion affected areas around Baltimore, Delaware, and northern Virginia—home to the world's largest data center hub. The grid faces mounting strain from rapidly growing electricity demand driven by data centers, EV charging, heat pumps, and air conditioning, while new generation projects remain delayed.

Market Issues:

Despite 2023 market reforms aimed at improving efficiency, PJM's independent monitor Monitoring Analytics LLC flagged ongoing problems with the balancing formula, stating it overestimates costs and doesn't minimize expenses as intended. The watchdog notes the methodology assumes power plants sacrifice more electricity sales than they actually do, artificially inflating compensation rates.

Business Concerns:

Industrial customers, including the Ohio Manufacturers' Association representing factories and steel mills, have criticized steep electricity price increases while demand forecasts remain uncertain and generation capacity lags behind.