Gallery: The 7 Most Energy-Efficient Baseball Stadiums in the U.S.

Photo: Safeco Field. Credit: Seattle Mariners

5. Safeco Field: Seattle Mariners

Through energy-efficient and other green improvements, the Seattle Mariners reduced natural gas use by 60%, electricity use by 30%, and water use by 25% from 2006 to 2011, resulting in an overall savings of $1.5 million (an annual savings of nearly $300,000). During that time, the Mariners also reduced their energy intensity by 25%, winning Safeco Field the grounds to boast lowest energy intensity of all MLB stadiums that participate in the Environmental Protection Agency’s ENERGY STAR program. Improvements include replacing the old incandescent bulb scoreboard with a new LED scoreboard, which lowered annual electricity consumption by more than 90% (from 1.2 million kilowatt-hours to 130,000 kilowatt-hours), retrofitting mens' bathrooms with low-flow urinals (which use 1 pint of water per flush, rather than 1 gallon), and recommissioning all HVAC systems.

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