The chief executive of Exelon announced today his company was leaving the U.S. Chamber of Commerce, making it the third utility in a week to quit the group over the Chamber’s opposition to climate legislation.

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The Chicago-based utility has been a major supporter of capping carbon dioxide emissions to address global warming. CEO John Rowe announced this morning that Exelon would not renew its membership to the Chamber.

Previously, PG&E and PNM Resources announced they were quitting the Chamber over its opposition to the cap-and-trade climate bill being considered by Congress.

