Covanta Holding Corp. to Release Earnings on April 30

Date: April 23, 2007

Source: Covanta Holding Corporation

Covanta Holding Corporation To Host Conference Call On May 1, 2007

Covanta Holding Corporation (NYSE: CVA) will host a conference call at 8:30 AM (Eastern) on Tuesday, May 1, 2007 to discuss its first quarter results. The Company will release its financial results for the first quarter after the market close on April 30, 2007. In addition, Covanta will make supplemental information available on April 30, 2007 prior to the call. The documents will be available in the Investor Relations section of the company's website at www.covantaholding.com.

Prepared remarks discussing the results and the supplemental information will be followed by a question-and-answer session. To participate, please dial 800-289-0438 approximately 10 minutes prior to the scheduled start of the call. If you are calling from outside of the United States, please dial 913-981-5527. The conference call will also be web cast live on the Investor Relations section of the Covanta website.

A replay of the conference call will be available from 11:00 AM (Eastern) Tuesday, May 1, 2007 through midnight (Eastern) Tuesday, May 8, 2007. To access the replay, please dial 888-203-1112 or 719-457-0820 and use the replay pass code: 9963240. The web cast will also be archived on www.covantaholding.com.

About Covanta Holding

Covanta Holding Corporation is a New York Stock Exchange listed company engaging in waste disposal, energy services and specialty insurance through its subsidiaries. Covanta's subsidiary, Covanta Energy Corporation, is an internationally recognized owner and operator of energy-from-waste and power generation projects. Covanta Energy's energy-from-waste facilities convert municipal solid waste into renewable energy for numerous communities, predominantly in the United States.

For more information, visit: www.covantaholding.com.

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