In 2011, the average residential energy bill was $110.14. The average household energy usage was 940 kilowatt-hours. The state with the highest electricity prices was Hawaii, and the state with the lowest prices was Idaho.
The largest company in terms of electricity revenue sales in 2011 was Pacific Gas & Electric Company, with revenues of $11.58 billion. Overall, the United States consumed 3.88 billion megawatt-hours of energy during the year. The largest source of power in the United States was coal, which produced 42 percent of all the energy used. This was followed by natural gas at 25 percent, nuclear at 19 percent, hydro at 8 percent, renewable sources at 5 percent and oil at 1 percent.
Carbon dioxide produced about 2.29 billion metric tons of emissions. This was followed by sulfur dioxide at around 4.85 million metric tons and nitrogen oxides at about 2.41 million metric tons.
Some energy companies allow homeowners to average their energy bills over the course of a year to prevent paying higher costs in some months and lower cost in others. To do this, energy companies average out the amount of energy that a homeowner uses over a year. At the end of every month, the difference is either debited or credited back to the homeowner.