1045 Hickory Street Pewaukee, WI 53072 Phone: (262)524-3300 Fax: (262)524-3319 www.cooperpower.com News Release Contact: Correy Robertson 412-394-6611 correy.robertson@bm.com Cooper Power Systems Envirotemp™ FR3™ Fluid Secures FERC Approval for Capital Treatment Bio-based dielectric coolant extends life of insulation systems, and retrofilling costs can now be capitalized WAUKESHA, WI, March 9, 2011 — The Federal Energy Regulatory Commission (FERC) approved an accounting petition filed by Waverly Light and Power which allows utilities to capitalize all costs incurred to retrofill a transformer with bio-based dielectric coolant, for the enhanced performance and extension of useful life of the transformer, under the FERC Uniform System of Accounts. The market leading biobased dielectric coolant is Envirotemp™ FR3™ fluid, produced by Cooper Power Systems, a global leader in dielectric fluids for the utility market. The approval comes in the form of a Letter Order from Bryan K. Craig, Director and Chief Accountant, Division of Audits, Office of Enforcement, of FERC in Docket No. AC11-2-000. In the order from FERC, Mr. Craig affirmed that Envirotemp FR3 fluid from Cooper Power Systems qualified under the Commission’s Uniform System of Accounts as “a minor item of property that did not previously exist provided that a substantial addition results from its use.” Industry standard accelerated life testing of transformers filled with bio-based FR3 fluid shows that it can extend insulation system life many times over the historic industry standard, mineral oil. The ruling declares that a utility may capitalize all of the costs incurred to retrofill a transformer with bio-based dielectric fluid. Envirotemp FR3 fluid is a sustainable alternative to traditional mineral oil, offering numerous benefits including exceptional fire-resistant properties and a reduced environmental impact, in addition to its demonstrated ability to extend the life of a transformer’s insulation system. The bio-based fluid is listed in the USDA BioPreferred program, and is derived from 100 percent edible seed oil, making its biodegradation rate and completeness meet the U.S. Environmental Protection Agency (EPA) criteria for -More- Cooper Power Systems – Page 2 "Ultimate Biodegradability" classification. Envirotemp FR3 fluid received the first published EPA Environmental Technology Verification for transformer materials. “FR3 fluid has been used in new and retrofilled transformers for over a decade because of its enhanced fire safety and environmental benefits, not to mention its demonstrated asset life extension capabilities,” said Tom Brockley, Business Unit President - Transformer Products, Cooper Power Systems. “This ruling from the FERC acknowledges FR3 fluid’s benefits, and in addition, allows capitalization of all costs incurred to retrofill a transformer. We anticipate that this FERC validation of our FR3 fluid technology will provide a strong motivation to retrofill transformers with FR3 fluid.” About Cooper Power Systems Cooper Power Systems, Inc., with 2010 revenues of approximately $1.2 billion, is a division of Cooper Industries plc (NYSE: CBE). Cooper Power Systems is a global manufacturer of world-class power delivery and reliability solutions for the electrical and industrial markets. Through its Energy Automation Solutions group, it is also a leading provider of software, communications and integration solutions that enable customers to increase productivity, improve system reliability, and reduce costs. For more information, please visit www.cooperpower.com or www.cooperpowereas.com. About Cooper Industries Cooper Industries plc (NYSE: CBE) is a global electrical products manufacturer with 2010 revenues of $5.1 billion. Founded in 1833, Cooper's sustained success is attributable to a constant focus on innovation, evolving business practices while maintaining the highest ethical standards and meeting customer needs. The Company has seven operating divisions with leading market positions and worldclass products and brands including: Bussmann electrical and electronic fuses; Crouse-Hinds and CEAG explosion-proof electrical equipment; Halo and Metalux lighting fixtures; and Kyle and McGrawEdison power systems products. With this broad range of products, Cooper is uniquely positioned for several long-term growth trends including the global infrastructure build-out, the need to improve the reliability and productivity of the electric grid, the demand for higher energy-efficient products and the need for improved electrical safety. In 2010 fifty-nine percent of total sales were to customers in the industrial and utility end-markets and thirty-nine percent of total sales were to customers outside the United States. Cooper has manufacturing facilities in 21 countries as of 2010. For more information, visit the website at www.cooperindustries.com. ### 2