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Pa. study finds PJM short on generation

  • Spanish Market: Coal, Electricity, Natural gas
  • 16/09/26

Grid operator PJM Interconnection is projected to miss its reliability planning standard through 2030 even with the new power generation it expects to add, because data-center driven electricity demand is growing faster than supply, according to a Pennsylvania study.

The study's base-case outlook, which uses PJM's 2026 load forecast and assumes resource supply gradually improves through 2040, found the grid operator fails to meet its reliability standard from 2027-30 in the absence of new policies.

The Pennsylvania Public Utility Commission (PUC) said it commissioned the study to understand how rapid load growth, generator retirements and delays in new resource development could affect reliability across Pennsylvania and the broader PJM region, which covers 13 states the District of Columbia, making it the biggest grid operator in the US.

"Across all scenarios, new in-state generation additions do not keep pace with the growth of in-state load," the report said. The system remains "tightly constrained" even as new resources are added, with the model selecting most generation technologies up to their assumed build limits, the report said.

Under the study's base-case scenario, PJM's gas combined-cycle fleet increases to 71.8GW in 2030 from 61.4GW in 2025, while solar capacity rises to 56.1GW from 14.7GW. Onshore wind capacity grows to 21GW from 11GW and battery storage expands to 7.9GW from 0.5GW.

Pennsylvania policymakers are increasingly focused on how data center growth effects electricity prices and reliability. Governor Josh Shapiro (D) has lobbied his counterparts to take a more active role in shaping PJM's policies as it grapples with unprecedented load-growth projections. Shapiro recently imposed new requirements on data center development to ensure new large-load customers pay for the infrastructure needed to serve them and do not shift costs to existing ratepayers.

The report projects Pennsylvania will remain PJM's largest generation state, but its share of regional generating capacity shrinks over time as more resources are added in states such as Virginia and Ohio. Pennsylvania's share was 23pc in 2025 and is projected to fall to 20-21pc by 2030 and 14-17pc by 2040.

Through 2030, most new generation added in Pennsylvania consists of solar and battery storage. By 2040, the state's gas combined-cycle fleet rises to 32GW from 20GW in 2025, while coal capacity falls to about 1GW from 4.6GW. Across all modeled scenarios, the study projects 14-29GW of coal retirements across PJM by 2040 as plants reach the end of their useful lives and face competition from more economic resources.

The study did not evaluate specific solutions to the projected reliability shortfall, including whether extending the lives of existing coal plants or adding capacity beyond the modeled resource mix would improve reliability outcomes. Thermal generators were assumed to retire on or before their scheduled retirement dates, with additional retirements based on modeled economics, PUC officials said in response to questions from Argus.


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