As the demand for electricity rises across the U.S., generators are looking to bring more supply online. Here’s a general outlook by regional transmission organization of current capacity, projected near-term additions (capacity under construction or permitted as of 2024) minus retirements, and how that compares to projected demand through 2029.

Outlook by Regional Transmission Organization

Projected electricity demand growth by RTO

Region

Current Capacity

 Near-term Additions Minus Retirements (through 2029) System Peak (2024) Projected Growth Through 2029
Non-RTO 448,853 460,788 413,094 438,994

PJM

 230,853 231,442 211,078 240,678
Midcontinent ISO 211,374 212,620 192,457 201,557
ERCOT 151,454 192,828 141,591 184,391
SPP 109,305 108,461 102,685 108,985
California ISO 90,627 91,986 86,030 108,030
New York ISO 47,308 51,953 43,921 48,521
New England ISO 38,375 41,044 34,823 36,083

Sources:

Hitachi Energy Velocity Suite database, accessed January and February 2025.
“Strategic Industries Surging: Driving US Power Demand.” Grid Strategies, December 2024.
“2024-2033 Forecast Report of Capacity, Energy, Loads, and Transmission.” ISO New England, May 2024.
“2029 Local Capacity Study” California ISO, April 2024.

 

Learn more about trends in generating capacity in our America’s Electricity Generation Capacity report.

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