1999: New York Skyscraper Incorporates Solar Panels for Energy

4 Times Square, the tallest skyscraper built in New York City during the 1990s, is completed. The building incorporates a record-breaking amount of energy-efficient building techniques, which include an array of PV panels on the 37th through 43rd floors that produce power from sunlight. The array uses a “photovoltaic skin” that replaces the usual glass cladding materials. [US Department of Energy, 2002 ]