US department of Energy

If you live in a typical U.S. home, your appliances and home electronics are responsible for about 20 percent of your energy bills

Many appliances continue to draw a small amount of power when they are switched off. These "phantom" loads occur in most appliances that use electricity, such as VCRs, televisions, stereos, computers, and kitchen appliances. In the average home, 75% of the electricity used to power home electronics and appliances is consumed while the products are turned off.

There is a common misconception that screen savers reduce energy use by monitors; they do not

In 2008, the average annual electricity consumption for a U.S. residential utility customer was 11,040 kWh, an average of 920 kilowatt-hours (kWh) per month

USA average cost per KWH 9.89 cents or $90.98 USD per month