Press Release

06.30.08

Acorn Energy set to join Russell Microcap Index

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Montchanin, DE. - Monday, June 30, 2008. Acorn Energy (NASDAQ:ACFN) joined the Russell Microcap Index when Russell Investments reconstituted its family of U.S. indexes on June 27, according to a preliminary list of additions posted June 20th on www.russell.com

Membership in the Russell Microcap Index, which remains in place for one year, means automatic inclusion in the appropriate growth and value style indexes. Russell determines membership for its equity indexes primarily by objective, market-capitalization rankings and style attributes.

Remarked John A. Moore: “It is an honor for Acorn to be included in the Russell Microcap Index. This is a major milestone in our ongoing effort to create more visibility and liquidity for our shareholders. We are just getting started.”

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. An industry-leading $4.4 trillion in assets currently are benchmarked to them.

Annual reconstitution of Russell indexes captures the 4,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization to create the Russell 3000® Index and Russell Microcap. These investment tools originated from Russell's multi-manager investment business in the early 1980’s when the company saw the need for a more objective, market-driven set of benchmarks in order to evaluate outside investment managers.

Total returns data for the Russell Microcap and other Russell Indexes is available at http://www.russell.com/Indexes/performance/daily_total_returns_us.asp.

About Russell:

Russell Investments aims to improve financial security for people by providing strategic advice, world-class implementation, state-of-the-art performance benchmarks, and a range of institutional-quality investment products. With more than $213 billion in assets under management, Russell serves individual, institutional and advisor clients in more than 40 countries. Russell provides access to some of the world’s best money managers. It helps investors put this access to work in corporate defined benefit and defined contribution plans, and in the life savings of individual investors.

Founded in 1936, Russell is a subsidiary of Northwestern Mutual Life Insurance Company. Headquartered in Tacoma, Wash., U.S., Russell has principal offices in Amsterdam, Auckland, Johannesburg, London, Melbourne, New York, Paris, San Francisco, Singapore, Sydney, Tokyo and Toronto.

About Acorn Energy, Inc.

Acorn Energy is a publicly traded holding company focused on improving the efficiency of the energy grid and reducing the environmental impact of the energy sector. Acorn Energy’s operating companies leverage advanced technologies to transform the existing energy infrastructure. Acorn’s strategy is to take primarily controlling positions in companies led by great entrepreneurs and add value by supporting those companies with marketing, strategy, and business development. Acorn Energy is a global company with equity interests in Comverge, CoaLogix, DSIT, Gridsense, Coreworx, Local Power and Paketeria. For more information visit www.acornenergyinc.com.