Millions of people transit through Grand Central Station in New York every year. At first look, this hundred-year-old station does not look energy efficient. Imagine it contains more than 60,000 light bulbs. The Metropolitan Transit Authority (MTA) are working hard (good thing) in making this the most energy efficient public building in the city.
They have replaced 20,000 bulbs with CFLs that look like the original bulbs. They are even testing with the building's chandeliers, which from a design perspective are harder to replace. It is estimated all this bulb replacement will save the MTA more than $100,000 per year.
The bulbs are not the only part of their strategy. The station has replaced its air-conditioning system with a unique low-cost lithium bromide and steam system that resided beneath the building. The ac is twice as efficient as a conventional system plus cheaper.
The station recycles all the newspapers passengers leave behind. It amounts to over 5 tons of paper each day.
This is very good keeping in mind this station is designated as a National Historic Landmark that means the organization needs to get approval for almost every change made to the building.