Annual iPad-charging cost: $1.36

Electric Power Research Institute (EPRI)  

Each model of the iPad consumes less than 12 kWh of electricity a year, based on a full charge every other day. By comparison, a plasma 42-inch television consumes 358 kWh of electricity a year.

Costs vary depending in which region a consumer resides and on the price of electricity in a location.
 
The assessment was conducted to determine the load requirements — the amount of power needed to operate the devices — of the increasingly popular iPad. According to Apple, 67 million of the devices have been purchased worldwide.
 
Calculations show that the average energy used by all iPads in the market is some 590 GWh.
 
“As information technologies continue to change rapidly, we see important implications for energy consumption,” said Mark McGranaghan, vice president of power delivery and utilization at EPRI. “These results raise important questions about how the shifting reliance from desktop to laptop to mobile devices will change energy use and electricity requirements for the information age. At less than a penny per charge, these findings bring new meaning to the adage “ËœA penny for your thoughts.'”
 
McGranaghan also said that changes in battery technology and technology features will affect energy requirements.
 
The EPRI analysis shows that the Apple iPhone 3G consumes 2.2 kWh of electricity each year, a power cost of 25 cents annually.
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Annual iPad-charging cost: $1.36

Electric Power Research Institute (EPRI)  

Each model of the iPad consumes less than 12 kWh of electricity a year, based on a full charge every other day. By comparison, a plasma 42-inch television consumes 358 kWh of electricity a year.

Costs vary depending in which region a consumer resides and on the price of electricity in a location.
 
The assessment was conducted to determine the load requirements — the amount of power needed to operate the devices — of the increasingly popular iPad. According to Apple, 67 million of the devices have been purchased worldwide.
 
Calculations show that the average energy used by all iPads in the market is some 590 GWh.
 
“As information technologies continue to change rapidly, we see important implications for energy consumption,” said Mark McGranaghan, vice president of power delivery and utilization at EPRI. “These results raise important questions about how the shifting reliance from desktop to laptop to mobile devices will change energy use and electricity requirements for the information age. At less than a penny per charge, these findings bring new meaning to the adage “ËœA penny for your thoughts.'”
 
McGranaghan also said that changes in battery technology and technology features will affect energy requirements.
 
The EPRI analysis shows that the Apple iPhone 3G consumes 2.2 kWh of electricity each year, a power cost of 25 cents annually.