The study, released June 15, contains home energy use stats from 2020.
Other fuel sources reported were natural gas and propane.
More on energy
In addition to heating, the study also looked at air conditioning usage.
Nearly 90% of US households used some form of air conditioning in 2020.
Air conditioning accounted for 9% of total site energy across all households but varied widely across states.
In Delaware, 97% of respondents used air conditioning, with 85% of them utilizing central air.
Households spent an average of $91 on lighting in 2020, an average of 654 kilowatt-hours.
That compares with $147 and 1,105 kWh in the 2015 survey.
And use of light-emitting diode, or LED, light bulbs is way up.
Electricity consumption for refrigeration varied by state.
Households that were energy insecure were billed more for energy than other households, the survey reported.
This was the 15th iteration of the study, which was first conducted in 1978.
