PUC warns Pennsylvania grid could fail to keep up with rapid data center growth

# What happened

# What the analysis found

Synapse modeled multiple scenarios. Under the study's severe scenario, projected new data center demand across PJM between 2029 and 2030 alone would exceed the current annual electricity demand of the entire Commonwealth of Pennsylvania. The PUC said that, based on the current environment, reliability risk by 2030 would be nearly six times PJM's planning standard.

# Why the PUC is concerned

# Actions the PUC is taking

The commission is pursuing several concrete steps:

• A model large-load tariff for customers that require 50 megawatts or more, intended to ensure those large customers bear the costs they add to the electric system rather than shifting them to other ratepayers.
• Implementation of Act 45 of 2025, which adds accountability for Pennsylvania utility load forecasts submitted to PJM. The PUC describes this as an additional "double check" as data center proposals push demand projections higher.

# PJM's response and measures

PJM acknowledged that electricity demand—primarily driven by data centers—is growing faster than the pace of new generation, potentially compromising reliability over the next five years and contributing to higher costs. PJM highlighted several responses:

• Market measures such as establishing a price cap and floor on capacity markets to reduce volatility and protect consumers and suppliers.

# What this means for customers and developers

For residential and business customers: the PUC's message is that reliability and potential cost impacts are real if demand outpaces supply. The PUC and PJM are both pursuing steps designed to limit those impacts.

For data center developers and other large-load customers: the PUC is moving toward policies that make large customers more directly accountable for the grid costs they create (tariffs, forecast scrutiny), and PJM is offering connection pathways that include requirements intended to protect existing customers (IRAS, Ratepayer Protection Pledge).

# Next milestones to watch

• Implementation details of the PUC's model large-load tariff and how it applies to new projects requesting 50 MW or more.
• Enforcement and effects of Act 45 of 2025 on utility forecasts submitted to PJM.
• PJM's deliberation and potential approval of the IRAS mechanism and how it will be applied to new data center connections.
• Any further state actions (regulatory or executive) that change permitting, interconnection, or incentives tied to data center siting and generation additions.

The situation frames a choice between tighter controls and requirements for new large loads, incentives or fast-tracking for projects that bring new generation, and continued PJM market and operational interventions aimed at preserving reliability while limiting cost impacts on existing customers.