• PJM Interconnection CEO David Mills warns the grid is no longer fit for purpose amid surging data center demand.
  • The system cannot secure enough power and protect households from rising costs under its current design, according to a letter to stakeholders.
  • Electricity bills have climbed sharply across the region, with potential shortages as early as next year.

The US power grid overseen by PJM Interconnection, serving 67 million people across 13 states, is under mounting pressure from surging electricity demand driven by AI-focused data centers. In a letter to stakeholders, CEO David Mills warned the system cannot both secure enough power and protect households from rising costs under its current design. "The current situation is not tenable," he wrote, pointing to deeper structural flaws reflected in rising prices, tight reserve margins, and weak investment signals.

The grid is facing multiple strains: potential electricity shortages as early as next year, and uncertainty linked to major utilities such as American Electric Power (AEP). Electricity bills have climbed sharply across the region—up 51% in Maryland and 41% in Illinois over five years. Mills said the region has "years, not decades" to act and emphasized the need for credible, stable market rules to restore confidence among utilities, investors, and consumers.

PJM is the largest grid operator in the US, coordinating transmission planning and energy markets for a growing contingent of data centers. The surge in data-center-driven demand intersects with policy debates about ratepayer protection and grid modernization. Several states are pursuing measures to shield ratepayers from escalating costs while maintaining reliability.

Federal and state regulators are increasingly focused on how to finance and accelerate grid upgrades. Grid operators and policymakers are weighing incentives for private investment, streamlined permitting, and regional planning to reduce bottlenecks. For households, higher electricity bills and potential price volatility are key concerns, especially in densely populated areas.

Correction: A previous version of this article misstated the timeframe for potential shortages. The correct timeframe is as early as next year.

Short term, expect continuing debate over market design reforms with potential incremental grid upgrades. Medium to long term, transformative changes in capacity pricing and transmission deployment are likely. Analysts widely agree that credible, stable policies and predictable investment signals are essential to prevent reliability lapses and excessive consumer costs.