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					For More Information Contact:
Mark Trinske, Energy Conversion Devices                        Michael B. Loughery, CertainTeed
(248) 299-6063                                                                   (610) 341-7328                               


    Next-Generation Residential Roofing Materials Will Generate Clean, Renewable Energy

(Valley Forge, Pa. and Rochester Hills, Mich.) October 2, 2008 – Energy Conversion Devices,
Inc. (ECD) (NASDAQ: ENER), the leading global manufacturer of thin-film flexible solar
laminates, and CertainTeed Corporation, a leading North American building products
manufacturer, today announced a joint agreement to develop roofing-integrated photovoltaic
products for the residential market, combining ECD’s UNI-SOLAR cells with CertainTeed
roofing products. The companies expect these new products to be commercially available
beginning in 2010.

Mark Morelli, ECD’s President and CEO stated, “This agreement is a significant expansion into
a new market for ECD. CertainTeed is clearly an industry leader in building materials and has a
broad product offering that can take advantage of the unique characteristics of our flexible,
lightweight and reliable UNI-SOLAR cells.”

“We are very pleased to be working with ECD to develop solar roofing products for residential
roofing applications,” said Guillaume Texier, President of CertainTeed Roofing. “The
lightweight and flexible design of the UNI-SOLAR solar cells makes them ideal for integrating
directly into our roofing products and will help us create aesthetically pleasing solar solutions
that blend seamlessly into the homeowner’s architecture, while generating clean, renewable
energy. This agreement reinforces our commitment to developing sustainable building products,
which is in line with our parent company Saint-Gobain’s strategy to provide innovative solutions
for the construction markets”
News Release                                                          ECD Agreement –Page 2 of 2

About Energy Conversion Devices
Energy Conversion Devices, Inc. (ECD) (NASDAQ: ENER) is the leader in building integrated
and commercial rooftop photovoltaics, one of the fastest growing segments of the solar power
industry. The company manufactures and sells thin-film solar laminates that convert sunlight to
energy using proprietary technology. ECD’s UNI-SOLAR brand products are unique because of
their flexibility, light weight, ease of installation, durability, and real-world efficiency. ECD also
pioneers other alternative technologies, including a new type of nonvolatile digital memory
technology that is significantly faster, less expensive, and ideal for use in a variety of
applications including cell phones, digital cameras and personal computers. For more
information, please visit

About CertainTeed

Through innovation and creative product design, CertainTeed has helped shape the building
products industry for more than 100 years. Founded in 1904 as General Roofing Company, the
firm made its slogan "Quality Made Certain, Satisfaction Guaranteed," which quickly inspired
the name CertainTeed. Today, CertainTeed® is North America’s leading brand of exterior and
interior building products, including roofing, siding, windows, fence, decking, railing, trim,
foundations, pipe, insulation, gypsum, ceilings and access covers.

Headquartered in Valley Forge, Pa., CertainTeed and its affiliates have more than 7,000
employees and more than 70 manufacturing facilities throughout the United States and Canada.
In 2007 the group had total sales of more than $3 billion.