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Connecticut   Connecticut Profile

State Profile and Energy Estimates

Changes to the State Energy Data System (SEDS) Notice: In October 2023, we updated the way we calculate primary energy consumption of electricity generation from noncombustible renewable energy sources (solar, wind, hydroelectric, and geothermal). Visit our Changes to 1960—2022 conversion factor for renewable energy page to learn more.

Profile Overview

Quick Facts

  • One of the three storage sites that make up the 1-million-barrel Northeast Home Heating Oil Reserve, which was created to offset disruptions in heating fuel supplies, is located in Groton, Connecticut, and it holds 300,000 barrels of heating oil.
  • About 42% of Connecticut households use heating oil or other petroleum products for home heating, the fourth-highest share for any state, and 36% of households use natural gas.
  • In 2022, the Millstone nuclear power plant generated 37% of Connecticut’s electricity. The state had the seventh-highest share of electricity provided by nuclear power in the nation.
  • In 2022, Connecticut’s electric power sector used a record amount of natural gas, which fueled 55% of the state's total electricity net generation.
  • Connecticut has one of the least energy-intensive state economies and uses less energy to produce one dollar of gross domestic product (GDP) than all other states except New York, Massachusetts, and California.

Last Updated: November 16, 2023

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