What do the cities of Dallas, Texas and Oakland, Calif. have in common? A lot, according to Toyota’s engineers, despite the two cities being separated by nearly 1,700 miles with different demographics and industries.

Either city could be powered for an entire year based on the amount of energy not used by Toyota’s 14 North American manufacturing plants during the past decade. For engineers, that’s equal to nearly 11 billion kilowatt hours of energy. And for non-engineers, that’s enough to power nearly 400,000 average U.S. households for an entire year.

Toyota’s 41,000 team members’ continuous efforts to reduce energy use have resulted in Toyota’s 10th consecutive ENERGY STAR Partner of the Year – Sustained Excellence Award from the U.S. EPA for continued leadership in protecting the environment through superior energy efficiency.

Ten consecutive ENERGY STAR Partner of the Year – Sustained Excellence Awards are the most by any automaker and Toyota’s accomplishments will be recognized in Washington, D.C., on April 29.

During the 10-year period, total energy use has been reduced by 22 percent per vehicle produced and total CO2 emissions has been reduced by 19 percent per vehicle produced. Total cost savings during the decade is nearly $500 million dollars.

“Through continuous improvement, good collaboration and sharing best practices, we continue to stay highly motivated to identify ways to minimize our impact to the environment,” says Robin Haugen, general manager of Toyota’s plant and environmental engineering group. “Our team members demonstrate that when good ideas are shared, great things can happen, and we are grateful to receive our tenth consecutive ENERGY STAR Partner of the Year – Sustained Excellence Award from the U.S. Environmental Protection Agency.”

In addition to the award, Toyota has been recognized for its commitment to energy reduction activities by several agencies and organizations including:

The U.S. Department of Energy’s Better Buildings, Better Plant Program, a national leadership initiative focused on industrial energy efficiency to reduce energy intensity by 25 percent over ten years. In 2012, Toyota further improved its energy intensity by nearly 10 percent, bringing its cumulative improvement to 27 percent (against a 2008 baseline).

Earning five U.S. EPA ENERGY STAR Automotive Assembly Plant Awards. The five plants receiving the award are in the top 25 percent of all North American plants in energy efficiency.

Earning six U.S. EPA ENERGY STAR Challenge For Industry Awards. This is awarded to non-vehicle assembly plants that achieve a ten percent improvement in energy performance.