Apple
MacBook Air MC968

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

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 11.7 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 16 kilowatt hours

Hewlett Packard
Folio Ultraportable 13-1020us

This is a thin, midsize notebook computer with a 13.3-inch screen and an Intel Core i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 15.2 kilowatt hours

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

Samsung
900X

This is a thin and ultraportable notebook computer with an 11.6-inch screen and an Intel Core i3 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 15.8 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 11.9 kilowatt hours

Toshiba
Portege Z830

This is a thin, midsize notebook computer with a 13.3-inch screen and an Intel Core i7 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 16.5 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 11.2 kilowatt hours

Samsung
V300

This is a midsize notebook computer with a 13.3-inch screen and an Intel Core i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 16.5 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 20.4 kilowatt hours

Acer
Aspire TimelineX AS5830-6402

This is a midsize notebook computer with a 15.6-inch screen, DVD writer and a second generation Intel Core i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 17.1 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 19.8 kilowatt hours

Dell
XPS 14z

This is a midsize notebook computer with a 14-inch screen, DVD writer and a second generation Intel Core i7 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 18.9 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 18 kilowatt hours

Lenovo
G770

This is a midsize notebook computer with a 17.3-inch screen, Blu-ray player, DVD writer and a second generation Intel Core i5 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 19.4 kilowatt hours

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

Apple
MacBook Pro 15-inch

This is a midsize notebook computer with a 15.6-inch screen, DVD writer and a second generation Intel Core i7 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 20.2 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 16.8 kilowatt hours

Hewlett Packard
ProBook 4730s

This is a midsize notebook computer with a 17.3-inch screen, DVD writer and a second generation Intel Core i7 processor.

The most energy-efficient computers, ranked by annual electricity consumed in typical usage: 25.3 kilowatt hours

Annual energy savings compared to average Energy Star model this size: 43.7 kilowatt hours