Eastern Interconnection
The Eastern Interconnection is one of the two major alternating-current electrical grids in the continental U.S. power transmission grid. The other major interconnection is the Western Interconnection. The three minor interconnections are the Quebec, Alaska, and Texas interconnections.
All of the electric utilities in the Eastern Interconnection are electrically tied together during normal system conditions and operate at a synchronized frequency at an average of 60 Hz. The Eastern Interconnection reaches from Central Canada eastward to the Atlantic coast, south to Florida, and back west to the foot of the Rockies.
Interconnections can be tied to each other via high-voltage direct current power transmission lines, or with variable-frequency transformers, which permit a controlled flow of energy while also functionally isolating the independent AC frequencies of each side. The Eastern Interconnection is tied to the Western Interconnection with six DC ties, to the Texas Interconnection with two DC ties, and to the Quebec Interconnection with four DC ties and a VFT.
In 2016, National Renewable Energy Laboratory simulated a year with 30% renewable energy in 5-minute intervals. Results show a stable grid with some changes in operation.The North American Electric Reliability Corporation reported in 2008 the following actual and projected consumption for the regions of the Eastern Interconnection :
