The newly reconstructed Stillwell Avenue subway station in Brooklyn has become the city's first solar-powered train terminal, and one of the most environmentally responsible mass transportation sites built in the U.S. The 76,000-square foot state-of-the-art solar roof, manufactured by RWE SCHOTT Solar, is expected to contribute approximately 250,000 kilowatt hours a year to the station's non-traction power needs.
"For the first time, the city's subway system will have a clean and efficient source of energy, an environmentally sound way to keep this terminal up and running round the clock, year round," says Donald Press, General Manager, Advanced Materials. "The MTA has surely set an example for the rest of nation."
The new arched solar roof, consisting of 2,730 building integrated photovoltaic panels (BIPVs), covers the full width of the station and offers effective weather protection for travelers as well as station facilities. According to RWE SCHOTT Solar this seamless integration of the technology gives it a distinct aesthetic quality.
"Stillwell Avenue Station showcases what can be done with photovoltaics today," says Steve Cohen, Product Manager, Architectural Glass. "Solar systems don't have to be bulky add-ons to a structure anymore, but become an integral part of it."
RWE SCHOTT Solar's amorphous silicon thin-film solar panels were chosen in a rigorous evaluation process based on a variety of criteria, including price of the panels, cost of installation, power-generating efficiency and aesthetics. The solar panels also had to meet stringent structural and maintenance requirements such as the Dade County hurricane test.
The solar panels manufactured by RWE SCHOTT Solar are the largest thin- film panels in the world, requiring less framing to reduce installation costs. The partially transparent 5' x 20' glass laminate panels used in the station are made of clear glass and strips of thin-film amorphous silicon material.
The solar roof was designed for easy access, allowing for maintenance and replacement of panels from above via an arched gantry and integrated maintenance cat walks. Monitoring makes detection of panels that are not functioning easy. Prior to installation, RWE SCHOTT Solar coded and tested each panel for size, weight and wattage. These specifics were entered into the monitor system to allow for quick detection of any deviation. Once identified, a problematic panel can be tested right on the shed and then easily replaced, if necessary. The MTA mandates specific light levels for platforms, based on perceptions of safety and security. The solar shed roof allows 20-25% light transmission, helping to meet these requirements while reducing costs for daytime lighting.