Since February, Diageo’s North American headquarters in Norwalk has been powered entirely by electricity generated from renewable sources.

John Longo, director of corporate real estate for Diageo North America — the world’s largest producer of spirits — said the beverages company will see some savings from use-reduction actions like the addition of motion sensors that can control when lights turn on and off.

But he said the switch to renewable energy sources was not inherently about cost-savings.

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