1. Energy Information Administration, “Over one-quarter of U.S. households use electricity as the only source of energy.” Accessed July 21, 2023. [Online]. Available: https://www.eia.gov/todayinenergy/detail.php?id=52999.
2. EIA, “Use of natural gas - U.S. Energy Information Administration (EIA).” Accessed November 9, 2022. [Online]. Available: https://www.eia.gov/energyexplained/natural-gas/use-of-natural-gas.php.