The beloved New York City landmark Empire State Building is now run entirely by wind energy-making it a green new year for the 15,000 people working inside.

Empire State Realty Trust, Inc. which owns the 102-story skyscraper along with 13 other office buildings, signed a three-year contract with Green Mountain Energy to power its entire real estate portfolio throughout New York and Connecticut with renewable wind electricity.

According to the federal EPA, it made the company the nation's largest 100% user of green power in real estate.

More than a decade ago, the iconic building in Midtown Manhattan underwent a groundbreaking energy and efficiency retrofit, as part of the $550 million Empire State ReBuilding restoration program and has already delivered a 40% reduction in energy use and emissions.

100% of ESRT's more than 10.1 million square-foot portfolio is now powered by renewable wind energy, which is estimated to avoid the production of 450 million pounds of carbon dioxide-equivalent to the savings if every New York State household turned off all their lights for a month, or the addition of two Central Parks to New York City.

Green Mountain Energy was awarded the electricity contract after a bid process that involved multiple electricity providers and is expected to result in more than $800,000 in savings to ESRT for the first year of the contract.

Now the Art Deco decor isn't the only charm for tenants who can now boast they work in all-carbon neutral offices.

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