The famous Rockefeller Center Christmas tree is to be lit up in Midtown Manhattan on Wednesday night, being adorned with 30,000 energy saving bulbs attached to 5miles (8 km) of wiring.
New York Mayor Michael Bloomberg said he hoped to set an example for the tens of millions of New Yorkers and tourists who see the tree every year.
Using energy saving bulbs reduces the energy consumption of the holiday display from 3,510 to 1,297 kilowatt hours per day.
The lighting ceremony is scheduled from 7 p.m. (2400 GMT) through 9 p.m., with program featuring celebrity appearances and a star-studded musical lineup.
The tree will be illuminated from 5:30 a.m. to 11:30 p.m. daily, all day on Christmas and 5:30 a.m. to 9 p.m. on New Year's Eve. The display will last until Jan. 8, 2008.
This year's Rockefeller Center Christmas tree was cut down on Nov. 7 by a two-man crew using a giant handsaw at the Shelton, Connecticut home of Joe and Judy Rivnyak.
It is the 75th Rockefeller Center Christmas tree since the tradition started.
The 60-year-old Norway spruce is 84 feet (26 meters) tall and 48 feet (15 meters) in diameter.
Every year, a helicopter scouts homeowners' yards for the desired tree, in areas ranging from Connecticut, Vermont, Ohio, and Ottawa.
Millions of New Yorkers and tourists are expected to come to see the tree during the holiday season.
In partnership with Habitat For Humanity (HFH), the 75th Rockefeller Center tree will enjoy a second life, the Rockefeller Center said on its website
After the holiday season, the tree will be milled, treated and returned to Rockefeller Center as "green" lumber and made into symbolic door frames that will be used in select HFH building programs in New York City, the Gulf Coast, India and Brazil.