WASHINGTON—Nine automotive assembly plants are among 70 US manufacturing facilities that have achieved Energy Star certification from the Environmental Protection Agency for their superior energy performance in 2014. Together, these 70 factories cut their energy bills by $725 million and reduced greenhouse gas emissions by more than 8 million metric tons.

TOLUCA, Mexico—GM’s assembly plant here will get part of its electricity from wind turbines.

FINDLAY, OH—Whirlpool Corp. is using wind energy to power its assembly plant here. Two wind turbines will supply approximately 22 percent of the plant’s electricity.

STANFORD, CA—Researchers at Stanford University have increased the efficiency of a low-grade silicon solar cell by applying relatively cheap crystalline material, perovskite, on top of it.

TOKYO—Toyota’s North American manufacturing facilities saved 93.3 million gallons of water in 2014.

SAO PAULO, Brazil—A wind farm will power Honda’s automotive assembly plant here. Located hundreds of miles away, the farm has nine 3-megawatt turbines that are expected to generate all the electricity required for Honda’s annual production requirements.

DUBLIN, VA—Volvo’s New River Valley assembly plant in is now completely powered by methane gas from nearby landfills.

BOWLING GREEN, KY—The GM assembly plant here has met the EPA’s ENERGY STAR Challenge for Industry. The facility is one of 14 GM plants in the world to have met the energy-efficiency challenge and one of only two to have achieved the honor three times.

TORRINGTON, CT—FuelCell Energy plans to spend $65 million to expand its assembly plant here, creating up to 325 jobs over the next four years.

OSHAWA, ON—Another 11 General Motors facilities worldwide, including the automaker’s assembly plant in Ingersoll, ON, have achieved landfill-free status. All totaled, GM runs 122 landfill-free manufacturing and non-manufacturing facilities around the world.