US power grid map
The US power grid has three main interconnections in the Lower 48: Eastern, Western and Texas. Use this interactive map to explore transmission lines and balancing authorities, then compare electricity demand and open regional grid conditions.
How the US power grid is connected
The three US power grids
The Eastern Interconnection links much of the country east of the Rocky Mountains. The Western Interconnection serves the West, while the Texas interconnection is operated by ERCOT. Transmission within each interconnection allows electricity to flow among its connected systems. Connections between interconnections have distinct transfer limits.
Transmission lines and balancing authorities
Transmission lines carry electricity between generators, substations and demand centers. Balancing authorities coordinate supply, demand and interchange within their areas. Open a mapped area to investigate its demand; open the full map to inspect individual grid assets.
Physical grids and electricity markets
An interconnection can contain several electricity markets and utility systems. PJM and MISO, for example, both operate within the Eastern Interconnection. The market readings below retain each operator’s reporting time; the national demand chart provides a separate Lower 48 view.
Questions
How many power grids are in the United States?
The Lower 48 states have three main interconnections: Eastern, Western and Texas. Alaska and Hawaii have separate systems outside this Lower 48 demand account.
Where are the US electric grid boundaries?
The map shows balancing-area geography and transmission infrastructure. Electrical interconnections describe connected systems rather than state borders; the Eastern and Western pages provide regional context.
Is this a US power outage map?
This is a map of grid infrastructure and operating conditions. For reported customer interruptions, open the regional power outage Views.