POWER REGION
What is Eastern Interconnection?
The Eastern Interconnection · serves Eastern two-thirds of North America
The Eastern Interconnection is one of the giant synchronised AC machines that North America's grid is built from. Every generator from the Rockies to the Atlantic, across PJM, MISO, SPP, the Southeast and more, spins in lockstep at the same frequency. A disturbance anywhere ripples everywhere.
It connects to the Western Interconnection and ERCOT only through a handful of DC ties, which act as buffers between the otherwise-separate machines.
- Type
- Synchronous interconnection
- Region
- Eastern + central North America
- Frequency
- 60 Hz, locked
- Ties
- DC links to West + ERCOT
Frequently asked questions
What is the Eastern Interconnection?
It's the synchronised AC grid covering the eastern two-thirds of North America. All its generators run at the same frequency, linked to the Western grid and ERCOT only through DC ties.