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25. Tenaska
Tenaska
2007 revenue: $11.6 billion
Fiscal year end: Dec. 31
2007 Employees: 624
Industry: Energy
CEO: Howard Hawks
Location: Omaha, Neb.

King Coal is a PR nightmare for public companies, but the Nebraska utility is experimenting with a power plant that captures coal's carbon emissions.

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Last updated May 28 2008: 12:40 PM ET