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Seven Honda manufacturing plants in the United States earned EPA ENERGY STAR certification in 2025 for their energy efficiency. The Marysville and East Liberty plants in Ohio achieved this for the 20th consecutive year.

Other certified plants include the Indiana Auto Plant (14th year), Anna Engine Plant in Ohio (8th year), Alabama Auto Plant engine facility (7th year), and both Honda Transmission Plants in Ohio and Georgia (6th year each). The Honda Green Factory initiative, established in 2021, supports these efficiencies through measures such as electric heat pumps, waste heat recovery, and renewable energy agreements.