Substation Capacity for Large Loads

Substation screens cover hosting headroom and voltage for large load interconnection in PJM, ERCOT, and NYISO, linked to the data center requests queued at each station.

Related large load interconnection pages

• Data center interconnection queue
• Large load forecast to 2035
• PJM and ERCOT large load map
• Flexible data center load
• ISO load zones
• Energization probability model
• Monthly market reports
• Sources and methods

Frequently asked questions

What is a large load interconnection request?

A request by a large electricity customer, such as a data center, semiconductor fab or hydrogen plant, to connect new demand to the transmission grid, usually 20 MW or more.

Which grids does the Large Load Monitor cover?

PJM, ERCOT and NYISO today, covering 1,100+ requests and 260+ GW, with MISO, ISO-NE, CAISO and SPP planned.

How is energization probability estimated?

An interpretable model scores each request on study stage, substation headroom, site control and regulatory signals, then weights MW by probability and expected timing.