Lenovo
ThinkPad T430s

This is a thin and high-performance notebook computer with a 14.0-inch screen and an Intel i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 7.4 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 28 kilowatt hours

Apple
Macbook Air MD231, MD223/224

This is a thin and ultra-portable notebook computer with a 13.3-inch screen and an Intel i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 12 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 15 kilowatt hours

Apple
Macbook Pro MD212, MD213

This is a thin and high-performance notebook computer with a 13.3-inch retina screen and an Intel i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 13.8 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 13.1 kilowatt hours

Acer
Aspire S7-191, 391

This is a thin and ultra-portable notebook computer with a 11.6-inch screen and an Intel i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 14.6 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 12.4 kilowatt hours

Lenovo
IdeaPad S300

This is a thin and ultra-portable notebook computer with a 13.3-inch screen and an Intel i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 14.7 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 12.2 kilowatt hours

Apple
Macbook Pro MC975, MC976

This is a thin and high-performance notebook computer with a 15.4-inch retina screen and an Intel i7 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 16.1 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 19.4 kilowatt hours

Acer
Aspire V5-571

This is a thin notebook computer with a 15.6-inch screen and an Intel Core i3 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 16.9 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 18.5 kilowatt hours

Samsung
300 Series

This is a thin notebook computer with a 14.0-inch screen and an Intel Core i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 17.9 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 17.6 kilowatt hours

MSI
GX60

This is a high-performance gaming notebook computer with a 15.6-inch screen and an AMD Quad-Core A10 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 30.7 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 35.6 kilowatt hours

Dell
Precision M6700

This is a thin and high-performance notebook computer with a 17.3-inch screen and an Intel i7 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 41.1 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 25.3 kilowatt hours