Cleantech Index (CTIUS) adds ABB (ABB) and Ansys (ANSS)

Maxwell Technologies (MXWL), Trex (TWP), and Verenium (VRNM) Leave Index

NEW YORK, Jan. 2 /PRNewswire-FirstCall/ – -- Cleantech Indices, LLC, in conjunction with the American Stock Exchange (Amex), today announced the quarterly rebalancing of The Cleantech Index (Amex: CTIUS), effective December 29, 2007. The changes will also be reflected in the exchange-traded funds (ETF) based upon CTIUS: PowerShares Cleantech

Portfolio ETF (Amex: PZD) and KSM Cleantech ETF (Bloomberg ticker: KSMCLNT) in Israel. As part of the rebalancing, ABB (NYSE: ABB), Ansys (Nasdaq: ANSS) will be added to the Index while Maxwell Technologies (Nasdaq: MXWL), Trex (NYSE: TWP) and Verenium (Nasdaq: VRNM) will be removed.

Said Index Advisor, Rafael Coven of the Cleantech Indices, "Consistent with the CTIUS index strategy, we selected ABB and Ansys for their strong growth potential, technology, impact, sector representation, and leadership."

ABB is a global leader in energy transmission, generation hardware, power controls, and process automation. It has the scale and scope to capitalize on soaring demand worldwide that few competitors can match. Ansys is a leader in advanced simulation software used by engineers and designers to test products designs for performance under a wide range of operating conditions. Its software is used in many industries and is critical to accelerating the development and optimizing the performance of new products from vehicles and motors, to fluid-handling systems.

• About CTIUS - The Cleantech Index™
• The Cleantech Index ('The Index') is the first, and only, equity index intended to reflect the surging global demand for clean technology ('cleantech') products and services. CTIUS is comprised of 47 public companies that are leaders in cleantech innovation and commercial deployment across a broad range of industry sectors: from energy efficiency and renewables to advanced materials, air & water purification, eco-friendly agriculture/nutrition, etc.

By tracking the market performance of the premier cleantech companies, CTIUS is the industry standard index and used by a growing range of financial products. Investors now have an easy, cost-effective, and liquid means to invest in the broad cleantech investment category -- and do so with far less risk than previously possible. For 2007, CTIUS is up 46.93% as of December 26. For more information visit: http://www.cleantechindex.com.

• "Cleantech" Defined
• Cleantech is defined as knowledge-based products and services that improve resource efficiency or product performance while reducing costs, pollution or other side-effects harmful to the environment and public health.
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• About Cleantech Group™, LLC
• The Cleantech Group™ provides insight, opportunities and builds relationships that catalyze and accelerate the growth of cleantech markets globally. The creator of the cleantech investment category, the Cleantech Group brings together investors, executives, thought leaders, policy makers and entrepreneurs to facilitate the global growth of cleantech via its five business units; the Cleantech Network™, Cleantech Media™, Cleantech Indices™, Cleantech Search™, and Cleantech China™. For further information, please visit http://www.cleantech.com.