page_title: Eastern Interconnection
hierarchical_section_title: Eastern Interconnection
caption_attribution_description: English: I created this image for use on WikiPedia
context_page_description: 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.
context_section_description: The Eastern Interconnection is one of the two major alternating-current (AC) 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 (excluding Quebec), south to Florida, and back west to the foot of the Rockies (excluding most of Texas).
  Interconnections can be tied to each other via high-voltage direct current power transmission lines (DC ties), or with variable-frequency transformers (VFTs), 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 (wind and solar power) in 5-minute intervals. Results show a stable grid with some changes in operation.
caption: The two major and three minor NERC interconnections, and the nine NERC Regional Reliability Councils.
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